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Apr 21

characteristics of laccolith

Characteristics of a laccolith along the LRTPB fault zone between Pearl River Mouth Basin and Southwest Taiwan Basin Bo-wen Li, Q. Tang, +2 authors Xiao Wang Published 2021 Geology Terrestrial, Atmospheric and Oceanic Sciences The northern margin of the South China Sea (SCS) is often regarded as a magmapoor passive continental margin. Batholith is derived from two Greek words: "batho" meaning deep and "litho" meaning stone. This laccolith is thus generated in a somewhat similar way as thick, multiple sills (Fig. Batholiths are vast, rising at least 100 square kilometers above the surface of the Earth, which is why they're so hard to miss. Plus, get practice tests, quizzes, and personalized coaching to help you One of the world's most spectacular examples of a laccolith is found in Chile's Torres del Paine National Park. The pressure of the magma is high enough that the overlying strata are forced upward, giving the laccolith its dome-like form. Metamorphic Foliation Causes & Types | What is Foliation in Metamorphic Rocks? Clastic Sedimentary Rocks | What Is Clastic Sedimentary Rock? [20] Horizontal sheeted intrusions were fed by vertical intrusions. A renowned example of laccolith is found in Henry Mountain, Utah. Terri is also the author or co-author of five books, including Hiking the Grand Canyons Geology, Geology Underfoot in Northern Arizona, and Geology Underfoot Along Colorados Front Range. How Is Climate Change Impacting The Water Cycle. The laccolith is only visible to people after several years when high pressure forces the overlying material to bulge outwards forming hill-like features. These structures are created as magma cools beneath the Earth's surface. Rapid laccolith intrusion driven by explosive volcanic eruption. The formation of laccoliths can only occur after there is a violent volcanic eruption. Laccolith Definition & Meaning - Merriam-Webster Laccoliths are characterized by their shape, as they are typically flat on the bottom and rounded or dome shaped on top. Its spectacular shape is characteristic of the vast igneous formations known as batholiths. Lopoliths are intrusions of igneous rocks with bowl-shaped floors and either flat or bowl-shaped tops. n. A mass of igneous rock intruded between layers of sedimentary rock, resulting in uplift. 32 and 15Ma (magnetic anomaly C11 to C5c). Dikes can occur alone or in sets and may be comprised of light (high-silica) or dark (low-silica) rocks, or any composition in between. [31], Dolerite intrusion laccolith in Sydney, Australia, Laccolith exposed by erosion of overlying strata in Montana, Pink monzonite laccolith intrudes within the grey Cambrian and Ordovician strata near Notch Peak, Utah[32], The eroded laccolith on the top of Vitosha[33] - the domed mountain next to Sofia, Bulgaria. Laccoliths formed from sills only when they became large enough for the pressure of the magma to force the overlying strata to dome upwards. Over time, the processes of weathering and erosion remove the overlaying sediment and rocks to reveal the batholith. The SRBIC thus has the characteristics of a continental plutonic complex emplaced in an oceanic plateau crust. - Definition, Symbols & Examples, What is a Mountain Range? More recent study of laccoliths has confirmed Gilbert's basic conclusions, while refining the details. The formation of laccoliths usually takes hundreds of years, and after a volcano has erupted, the dome takes a very extended period for it to surface to the ground. The central laccolith may initiate though ination of a sill that grew to a radius sufcient to lift the overburden, as hypothesized in traditional growth models. A few are just one big mountain or isolated formation. Both recent drilling into the Mesozoic and new reflection seismic surveys in the area provide a huge. {\displaystyle r_{0}} Characteristics and genesis of two strongly weathered soils in Samar, Philippines. Characteristics of a laccolith along the LRTPB fault zone between Pearl River Mouth Basin and Southwest Taiwan Basin, Boan Li, Qunshu Tang, Pin Yan, Junhui Yu, and Xiao Wang, Li, B., Q. Tang, P. Yan, J. Yu, and X. Wang, 2021: Characteristics of a laccolith along the LRTPB fault zone between Pearl River Mouth Basin and Southwest Taiwan Basin. The end features after the penetration of the magma is what is called a laccolith. A batholith is made up of many individual plutons, which are smaller bodies of rock that, while still molten, traveled up through the crust to their present position. [23], A system of laccoliths is exposed at Elba, which form a "Christmas tree" laccolith system in which a single igneous plumbing system has produced multiple laccoliths at different levels in the crust. A blister-shaped pluton that raised the overlying rocks into a dome may be called a laccolith. Public domain photo by RBM, U.S. Geological Survey Hawaiian Volcano Observatory. Environmental effects of the formation of laccoliths Crystal Shape Types & Overview | Formation Shapes of Crystals. What Is A Laccolith? - WorldAtlas {\displaystyle T} At other localities, such as in the Henry Mountains and other isolated mountain ranges of the Colorado Plateau, some intrusions demonstrably have the classic shapes of laccoliths. Table 1 from Characteristics of a laccolith along the LRTPB fault zone In the diagram above, the dike and the volcanic neckdespite the latter's nameare both intrusive features, whereas the fissure, lava flows, and volcanic cone are all extrusive. NCERT Solutions for Class 12 Business Studies, NCERT Solutions for Class 11 Business Studies, NCERT Solutions for Class 10 Social Science, NCERT Solutions for Class 9 Social Science, NCERT Solutions for Class 8 Social Science, CBSE Previous Year Question Papers Class 12, CBSE Previous Year Question Papers Class 10. The length of the laccolith on SO1E profile is significantly longer than the length on SOY profile. Maps of Mesozoic and Cenozoic major faults in the Zhujiang River Mouth Basin are compiled. The name batholith is derived from the Greek words batho for deep and litho for stone. Made of igneous rock, they are only visible once erosion of the overlaying sediment has taken place. Magmatic activities occurred after the cessation of seafloor spreading were founded mainly over the Continent-Ocean Transition (COT) zone. [14], The term was first applied as laccolite by Gilbert after his study of intrusions of diorite in the Henry Mountains of Utah in about 1875. The batholith is the large mass of an intrusive igneous rock form found below the Earths surface by the intrusion and solidification of magma. Terrestrial, Atmospheric and Oceanic Sciences, The northern margin of the South China Sea (SCS) is often regarded as a magmapoor passive continental margin. The content of silicon dioxide (SiO 2) in any rock is one of the most significant chemical characteristics of igneous rocks. If the resulting exposed rock mass is too small to be called a batholith, geologists often refer to it as a stock. The sill near the top of Colorados Engineer Mountain displays vertical cracks that 32 and 15Ma (magnetic anomaly C11 to C5c). The extensive intraplate seamounts are obvious features in the northern South China Sea (SCS). Different types of plutons are described based on the size of the exposed area visible to geologists. With time, this usually results in the formation of tiny hills and mountains around the central peak. The surface rock above laccolith often completely erodes, leaving the core mound of igneous rock. Because different types of igneous features form under varying conditions, each offers tantalizing clues to the conditions under which it solidified. One of the most-photographed examples comes from the Grand Canyon, where a dark dike slashes across thin, red shale layers above a frothing whitewater rapid. The Idaho Batholith is found in central Idaho. copyright 2003-2023 Study.com. The intrusion takes place when the pressure of magma is high enough to move the strata of sedimentary rock in an upward position or to make them fold. Two types of plutons include stocks and batholiths. Although the use of "volcanic" in the name suggests that volcanic necks are extrusive features, they are comprised of intrusive igneous rocks. [30], Possible laccoliths have also been identified on Mars, in western Arcadia Planitia. The exposed laccolith then forms a hill or mountain. Rapid laccolith intrusion driven by explosive volcanic eruption - Nature laccolith, in geology, any of a type of igneous intrusion that has split apart two strata, resulting in a domelike structure; the floor of the structure is usually horizontal. The Round Top laccolith is considered to be one of the youngest laccoliths in a series of five known as the Sierra Blanca peaks, located in Hudspeth county, Texas. In other cases, less sticky magma (For example, shonkinite) may form phenocrysts of augite at the bottom, then inserted through a vertical feeder dike that ends in laccolith. All maps, graphics, flags, photos and original descriptions 2023 worldatlas.com, The 8 Most Picturesque Small Towns In the Adirondack Mountains, Meet 12 Incredible Conservation Heroes Saving Our Wildlife From Extinction, India's Leopard God, Waghoba, Aids Wildlife Conservation In The Country, India's Bishnoi Community Has Fearlessly Protected Nature For Over 500 Years, Wildfires And Habitat Loss Are Killing Jaguars In The Amazon Rainforest, In India's Sundarbans: Where People Live Face-To-Face With Wild Tigers, Africa's "Thunderbird" Is At Risk Of Extinction. A sill is a flat, sheet-like igneous rock mass that forms when magma intrudes into and crystallizes between preexisting rock layers. characteristics are shared by many of the magma systems, both old and new: pulsed construction, tabular geometry, and lateral magma transport. In order for an intrusion to be called a batholith, the exposed area showing at the Earth's surface should be at least 100 square kilometers, though some of these formations are much larger than that. She is a 2019 Association of Health Care Journalists Fellow, a 2016 EGU Science Journalism Fellow, and the 2019-2020 Science Communication Fellow for the Geological Society of America. These structures are also known as plutonic formation or an igneous intrusion which are similar to the sills. from publication: Characteristics of a laccolith along the LRTPB fault zone between Pearl River . Laccoliths are intrusive igneous rock formations distinguished by their characteristic lens shapes. Magmatic activities occurred after the cessation of seafloor spreading were founded, The seafloor spreading of the South China Sea (SCS) was previously believed to take place between ca. Atmos. Intrusive igneous rocks are formed when magma rises but cools below the Earth's surface. By contrast, molten material that has erupted onto the Earth's surface is named lava, which cools into what geologists call extrusive (or volcanic) rocks. - Definition & Explanation, What is a Map Key/Legend? The laccolith is the attribute of the region where the crust is being flattened and the direction of the least stress is vertical, whereas the region where the crust is in pressure is more likely to form dikes as the direction of the least stress is parallel. [28] Others are located along possible faults or fissures. Sunset Crater, a 1,000-foot-high volcanic cone in northern Arizona, is the centerpiece of Sunset Crater National Monument. . By definition, batholiths have more than 40 square miles (100 square kilometers) of surface exposure. This, This paper presents results of two-dimensional seismic mapping of the northern East China Sea Shelf Basin. Let us know if you have suggestions to improve this article (requires login). They are assumed to be fed by a conduit from below, though this is rarely exposed. [4] The critical radius for the sill to laccolith transition is now thought to be affected the viscosity of the magma (being greater for less viscous magma) as well as the strength of the host rock. New magnetic data acquired in the northernmost SCS, Igneous rocks in the northern margin of the South China Sea (SCS) have been identified via high resolution multi-channel seismic data in addition to other geophysical and drilling well data. A geologist by training and a member of both the Society of American Travel Writers and the National Association of Science Writers, Terri weaves accurate, engaging stories for a wide variety of clients and outlets including the U.S. Geological Survey, Eos, Scientific American, and Lonely Planet. Batholiths can be found throughout the world. succeed. [22], One of the largest laccoliths in the United States is Pine Valley Mountain in the Pine Valley Mountain Wilderness area near St. George, Utah. Laccolith definition, a mass of igneous rock formed from magma that did not find its way to the surface but spread laterally into a lenticular body, forcing overlying strata to bulge upward. Stocks refer to plutons having a surface area less than 100km, while batholiths represent plutons greater than 100km in area. [8] The periphery of a laccolith may be smooth, but it may also have fingerlike projections consistent with Rayleigh-Taylor instability of the magma pushing along the strata. The coexistence of the laccolith and surrounding sills over the LRTPB shows that the north limit of magmatism is further north than the COT zone. Dating of the intrusions has helped determine the point in geologic time when compression was replaced with extension. The northern margin of the South China Sea (SCS) is often regarded as a magmapoor passive continental margin. Laccoliths are distinguished from other igneous intrusions by their dome-shaped upper surface and level base. Geology Underfoot Along Colorados Front Range. Keywords: Northeastern South China Sea Continental slope Sills Laccolith Fault zone; Citation: Li, B., Q. Tang, P. Yan, J. Yu, and X. Wang, 2021: Characteristics of a laccolith along the LRTPB fault zone between Pearl River Mouth Basin and Southwest Taiwan Basin. We have grown leaps and bounds to be the best Online Tuition Website in India with immensely talented Vedantu Master Teachers, from the most reputed institutions. The rock surface above a laccolith destroys completely, leaving the core mound of igneous rock. Granite, gabbro, and diorite are examples of rocks that can form during the crystallization of a magma chamber. Some are a 'mere' few million years old, while others date back to the Precambrian. l The coexistence of the laccolith and surrounding sills over the LRTPB shows that the north limit of magmatism is further north than the COT zone. These features can vary from less than one inch up to hundreds of feet thick and can extend for many miles. For example, in Mexico, the laccoliths of the Ortiz porphyry belt was formed during Laramide compression of the region 33 to 36 million years ago. Silicate Minerals Types & Examples | What are Silicate Minerals? Magmatic activities occurred after the cessation of seafloor spreading were founded mainly over the Continent-Ocean Transition (COT) zone. {\displaystyle P_{m}} The elongated shape of the laccolith is accordant to the NW directional LRTPB, indicating that magmatic activities of study region maybe Lava erupts from a fissure in northern Iceland's Holuhraun lava field. [5], A laccolith forms after an initial sheet-like intrusion has been injected between layers of sedimentary rock. Each pluton is typically several kilometers in diameter. A relatively small igneous intrusion that forms when magma crystallizes underground. 9. In this lesson, the formation of batholiths and other similar intrusive igneous structures will be explored. In the first stage, magma from the Earth's mantle melts the adjoining crust. They are made up of plutons, which are themselves several kilometers in diameter. Try refreshing the page, or contact customer support. Therefore, batholith translates into "deep stone.". It is 15,400m in size, stretching 200 miles in one direction and 75 miles in the other. "This study was supported by the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) (GML2019ZD0204). All rights reserved. Lithification of Sediments: Steps & Processes | What is Lithification? It most commonly occurs in places where dark magmas with low silica contents erupt, such as the Holuhraun lava fields of Iceland and Kilauea Volcano of Hawaii. Other geologic features produced by volcanic and tectonic activity are highly visible, such as mountains and islands. Both recent drilling into the Mesozoic and new reflection seismic surveys in the area provide a huge. What Is Obsidian? They can be contrasted with sills, which are sheetlike intrusions oriented parallel to the bedding of the enclosing rock: a laccoliths ratio of diameter to thickness should be less than 10; a larger ratio would make the body a sill. [1][2] When the host rock is volcanic, the laccolith is referred to as a cryptodome. A laccolith is characterized by a dome-like shape as they are typically flat on the bottom and rounded or dome-shaped on the top. Image copyright iStockphoto / tonda. Home Rocks Igneous Rocks and Volcanic Landforms. Various igneous features such as sills, volcanic edifices and stocks were identified by the, The northeastern part of the South China Sea is a special region in many aspects of its tectonics. A relatively large igneous intrusion that forms when magma crystallizes underground and is later partially exposed following uplift and/or erosion. Therefore, batholith literally translates as ''deep stone.'' Two-stage growth of laccoliths at Elba Island, Italy - ResearchGate The largest laccolith in the United States is Pine Valley Mountain in the Pine Valley Mountain Wilderness area near St. George Utah. Acidic rocks are more common than basic rocks in laccoliths. Sci., 32, 443-458, doi: 10.3319/TAO.2021.09.07.01, Terrestrial, Atmospheric and Oceanic Sciences (TAO), A large-scale anomaly was seismically observed and identified as laccolith, Its elongated shape is accordant to the LRTPB dividing the SWTB and PRMB, The LRTPB may be responsible for the formation of the large-scale anomaly. (a) The Laccolith is imaged in two intersecting seismic profiles, and (b) the detailed view, By clicking accept or continuing to use the site, you agree to the terms outlined in our. A laccolith is defined as the body of igneous rock which has forced itself by the intrusion, in molten conditions between strata of sedimentary rock in such a way as to have raised the overlying strata in a dome shape arc above it. Before an eruption of a volcano, there is usually significant deposits of molten magma beneath the surface of the earth ready to erupt. ", Vitaliano, Dorothy B. [12], Over time, erosion can form small hills and even mountains around a central peak since the intrusive rock is usually more resistant to weathering than the host rock. Characteristics of a laccolith along the LRTPB fault zone between Pearl characteristics make the Copper Ridge laccolith an ideal location to study emplacement of magma in the shallow crust. - Location, Facts & History, Yellowstone National Park: Facts, Location & History, High School Chemistry: Homework Help Resource, Study.com ACT® Test Prep: Practice & Study Guide, CSET Foundational-Level General Science (215) Prep, Introduction to Earth Science: Certificate Program, Introduction to Environmental Science: Help and Review, DSST Health & Human Development: Study Guide & Test Prep, UExcel Basic Genetics: Study Guide & Test Prep, UExcel Microbiology: Study Guide & Test Prep, Role of Bacteria in Gastrointestinal Health, Fad Diets: Potential Dangers & Alternatives, Compaction in Geology: Definition & Examples, Allochthonous Material in Ecology: Definition & Impact, Sulfite: Uses, Formula, Side Effects & Allergy Symptoms, Magnetic Declination: Definition & Angles, What is Water Vapor? [14], The filled and solidified magma chamber of Torres del Paine (Patagonia) is one of the best exposed laccoliths, built up incrementally by horizontal granitic and mafic magma intrusions over 162 11 thousand years. Corrections? The elongated shape of the laccolith is accordant to the NW directional LRTPB, indicating that magmatic activities of study region maybe controlled by the faulting. Laccolith manages to form at relatively shallow depth and in few cases are formed by relatively viscous magma, such as those that crystallize to granite, diorite, and granodiorite. To unlock this lesson you must be a Study.com Member. r m Get unlimited access to over 88,000 lessons. On this Wikipedia the language links are at the top of the page across from the article title. Although uplift and/or erosion can later unearth part of a stock, this feature is defined as having less than 40 square miles (100 square kilometers) exposed at the surface. - "Characteristics of a laccolith along the LRTPB fault zone between Pearl River Mouth Basin and Southwest Taiwan Basin" - Definition, Pressure & Formula, Altimeter Setting: Definition & Procedures, Working Scholars Bringing Tuition-Free College to the Community. Omissions? Semantic Scholar is a free, AI-powered research tool for scientific literature, based at the Allen Institute for AI. Magmatic activities occurred after the cessation of seafloor spreading were founded, The seafloor spreading of the South China Sea (SCS) was previously believed to take place between ca. DOAJ 2023 default by all rights reserved unless otherwise specified. is the horizontal distance from the center of the laccolith, and Faults serve, By clicking accept or continuing to use the site, you agree to the terms outlined in our. Please refer to the appropriate style manual or other sources if you have any questions. 10. is the outer radius of the laccolith. Thus laccoliths are characteristic of regions where the crust is being compressed and the direction of least stress is vertical, while areas where the crust is in tension are more likely to form dikes, since the direction of least stress is then horizontal. Laccoliths are usually small in size, but the most massive laccolith is found in the United States called the Pine Valley Mountain. Various igneous features such as sills, volcanic edifices and stocks were identified by the, The northeastern part of the South China Sea is a special region in many aspects of its tectonics. Here, detailed structural and geophysical features of a large-scale anomaly (LSA) is revealed from high-resolution multi-channel seismic (MCS) profiles over the LRTPB dividing the SWTB and the PRMB. The intrusion takes place when the pressure of magma is high enough to move the strata of sedimentary rock in an upward position or to make them fold. Characteristics of a laccolith along the LRTPB fault zone between Pearl They are formed when magma rises below the Earth's crust and cools in place. [21], The small Barber Hill syenite-stock laccolith in Charlotte, Vermont, has several volcanic trachyte dikes associated with it. T r Vedantu LIVE Online Master Classes is an incredibly personalized tutoring platform for you, while you are staying at your home. In Big Bend Ranch State Park, at the southwesternmost visible extent of the Ouachita orogeny, lies the Solitario. A long crack on the Earth's surface from which lava pours out is called a fissure. Gully & Rill Overview & Formation | What is a Gully? It was here that geologist Grove Karl Gilbert carried out pioneering field work on this type of intrusion. Areas where molten rock material pools underground are called magma chambers. Many batholithic mountains you may have seen are smooth and rounded - this is because the stresses within the rock cause it to erode in sheets, or exfoliate, like the skin of an onion. The tabular mass of quartz trachyte near the summit of Engineer Mountain near Silverton, Colorado is a well-known example of a sill. Basalt is an example of an extrusive igneous rock formed from dark-colored lava. Tourists from all over the world travel to see these natural features which returns revenue to the country where the laccolith is located. As a member, you'll also get unlimited access to over 88,000 These features form when the pressure of the magma intruding between preexisting layers causes the overlying rocks to dome up, creating a mushroom shape. A variety of geologic processes contribute to the unique landscapes found throughout the world. The Henry Mountains of Utah, US, are an example of a mountain range composed of exposed laccoliths. The batholith forms when many plutons get together to form a granitic rock. DOI: 10.3319/tao.2021.09.07.01 Corpus ID: 245609638; Characteristics of a laccolith along the LRTPB fault zone between Pearl River Mouth Basin and Southwest Taiwan Basin @article{Li2021CharacteristicsOA, title={Characteristics of a laccolith along the LRTPB fault zone between Pearl River Mouth Basin and Southwest Taiwan Basin}, author={Bo-wen Li and Qunshu Tang and Pin Yan and Junhui Yu and . Lava flows are streams of lava that pour out of a volcanic vent or fissure. Create your account. These results establish strong similarities between the SRBIC, the only recorded example of a felsic laccolith in an oceanic intraplate setting, and many continental plutons emplaced in various geodynamic setting. Evidence, layout, nature, relation with basin development, and geodynamics of these faults are discussed. Semantic Scholar is a free, AI-powered research tool for scientific literature, based at the Allen Institute for AI. Various igneous features such as sills, volcanic edifices and stocks were identified by the, The northeastern part of the South China Sea is a special region in many aspects of its tectonics. Length to thickness relationships for individual laccolith layers show a power-law correlation that does not fit the . After velocity estimation, AVO analysis, and geological interpretation for the LSA, we suggest that the LSA is an intrusive igneous rock and further classified as a laccolith. In Geology, laccolith is a sheet-like intrusion that has been inserted between the two layers of sedimentary rocks. Terrestrial, Atmospheric and Oceanic Sciences, The northern margin of the South China Sea (SCS) is often regarded as a magmapoor passive continental margin. What are the characteristics of laccolith? There are several stages involved in the formation of a batholith. Our editors will review what youve submitted and determine whether to revise the article. formed as this igneous rock cooled. Because the resulting rock is typically harder than the material it intrudes into, it's left standing after the surrounding, softer rock has eroded away. Why Is Biodiversity Critical To Life On Earth? Ans. 180 lessons. How quickly lava flows move, and how far they go, depends upon the type of magma that's erupting. Intrusive rocks are observed in the Luzon-Ryukyu Transform Plate Boundary (LRTPB) dividing Southwest Taiwan Basin (SWTB) and Pearl River Mouth Basin (PRMB) north of the COT and their evolution mechanisms are not very well-studied. It begins to cool due to its viscosity and heat loss to the surrounding rocks. [25][26] At Devils Tower, intrusion would have had to cool very slowly so as to form the slender pencil-shaped columns of phonolite porphyry seen today. Enrolling in a course lets you earn progress by passing quizzes and exams. [3] Laccoliths form only at relatively shallow depth in the crust,[4] usually from intermediate composition magma, though laccoliths of all compositions from silica-poor basalt to silica-rich rhyolite are known. In South Africa, the Darling Batholith has also been widely studied by geologists. For hydrolaccolith, a mound of earth-covered ice formed by frost in subarctic environments, see, Problems reconstructing shapes of intrusions, "Beall, Joseph J." After velocity estimation, AVO analysis, and geological interpretation for the LSA, we suggest that the LSA is an intrusive igneous rock and further classified as a laccolith. Suzanne has taught college economics, geography, and statistics, and has master's degrees in agricultural economics and marine affairs (marine resource management). In other cases less viscous magma such as shonkinite may form phenocrysts of augite at depth, then inject through a vertical feeder dike that ends in a laccolith. The formation of critical geological features on the surface of the earth beautifies the environment and brings an aesthetic effect to the world. A laccolith is often smaller than a stock, which is another type of igneous intrusion, and usually is less than 16 km (10 miles) in diameter; the thickness of laccoliths ranges from hundreds of metres to a few thousand metres. Non-silicate Minerals: Chemical Classifications & Examples, Oceanic Ridge System: Formation & Distribution. Geologists believe that the Idaho Batholith was first formed 45 to 180 million years ago, during the Early and Middle Cretaceous periods.

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characteristics of laccolith