The placement of the Trans-European Suture Zone on the Romanian... electromagnetic arguments
... fault zones as only one of them (Peceneaga-Camena Fault) emphasizes the contact between the two types of crust having different thickness and electrical properties–what may be the normal consequence of the different age. This model (Fig. 2), by means of the resistivity contrast limits provided by 65 ...
... fault zones as only one of them (Peceneaga-Camena Fault) emphasizes the contact between the two types of crust having different thickness and electrical properties–what may be the normal consequence of the different age. This model (Fig. 2), by means of the resistivity contrast limits provided by 65 ...
3.8 Rocks and Processes of the Rock Cycle
... The rock beneath the Earth’s surface is sometimes heated to high enough temperatures that it melts to create magma. Different magmas have different composition and contain whatever elements were in the rock or rocks that melted. Magmas also contain gases. The main elements are the same as the elemen ...
... The rock beneath the Earth’s surface is sometimes heated to high enough temperatures that it melts to create magma. Different magmas have different composition and contain whatever elements were in the rock or rocks that melted. Magmas also contain gases. The main elements are the same as the elemen ...
Magmas and Igneous Rocks
... Stocks are smaller bodies that are likely fed from deeper level batholiths. Stocks may have been feeders for volcanic eruptions, but because large amounts of erosion are required to expose a stock or batholith, the associated volcanic rocks are rarely exposed. If multiple intrusive events occur in t ...
... Stocks are smaller bodies that are likely fed from deeper level batholiths. Stocks may have been feeders for volcanic eruptions, but because large amounts of erosion are required to expose a stock or batholith, the associated volcanic rocks are rarely exposed. If multiple intrusive events occur in t ...
Marathon, Ontario - University of Minnesota Duluth
... Figure 3: Index map showing relationship of major regional structural features to the Midcontinent Rift System(Modified from Lumberst 1978; Brummert 1978; from Sage, 1986). ...
... Figure 3: Index map showing relationship of major regional structural features to the Midcontinent Rift System(Modified from Lumberst 1978; Brummert 1978; from Sage, 1986). ...
IM_chapter7 Metamorphic Rocks
... 3. Note that metamorphic rocks can form from any parent rock type, even another metamorphic rock. Make frequent reference to the parent rock type(s) from which a given metamorphic rock formed. Make clear that although parent rock type is easily identified in some metamorphic rocks, such as quartzite ...
... 3. Note that metamorphic rocks can form from any parent rock type, even another metamorphic rock. Make frequent reference to the parent rock type(s) from which a given metamorphic rock formed. Make clear that although parent rock type is easily identified in some metamorphic rocks, such as quartzite ...
Science Highlights of the RCL Initiative
... The temperature of the mantle is thought to control the amount of magmatism present during rifting In all of these models, the predicted controlling factors would all operate over large areas and thus all rift segments in a region would behave similarly Not the case in the southern Gulf of Californi ...
... The temperature of the mantle is thought to control the amount of magmatism present during rifting In all of these models, the predicted controlling factors would all operate over large areas and thus all rift segments in a region would behave similarly Not the case in the southern Gulf of Californi ...
full text - NWT Protected Area Strategy
... to gneissic granodiorite and tonalite, and are exposed in several places in the western part of the province. Pb and Nd isotopic data (Thorpe et al., 1992, and Davis and Hegner, 1992, respectively) suggest that these old rocks underlie most of the central and western part of the craton (Figure 2). L ...
... to gneissic granodiorite and tonalite, and are exposed in several places in the western part of the province. Pb and Nd isotopic data (Thorpe et al., 1992, and Davis and Hegner, 1992, respectively) suggest that these old rocks underlie most of the central and western part of the craton (Figure 2). L ...
Rheological heterogeneity, mechanical anisotropy and
... the tectonic behaviour of the lithosphere. Lateral rheological heterogeneity of the continental lithosphere may result from various sources, with variations in geothermal gradient being the principal one. The oldest domains of continents, the cratonic nuclei, are characterized by a relatively cold, ...
... the tectonic behaviour of the lithosphere. Lateral rheological heterogeneity of the continental lithosphere may result from various sources, with variations in geothermal gradient being the principal one. The oldest domains of continents, the cratonic nuclei, are characterized by a relatively cold, ...
Mineralogy, geochemistry and geotectonic of plagiogranites from
... Mineralogy, Geochemistry and Geotectonic of Plagiogranites from Shahre-Babak Ophiolite, Zagros Zone, Iran into gabbros and especially dolerite dykes causes the enclosing of their parts as xenoliths or expanding of plagiogranite veins within it (Golestani, 2013). Neyriz ophiolite thrusted over limes ...
... Mineralogy, Geochemistry and Geotectonic of Plagiogranites from Shahre-Babak Ophiolite, Zagros Zone, Iran into gabbros and especially dolerite dykes causes the enclosing of their parts as xenoliths or expanding of plagiogranite veins within it (Golestani, 2013). Neyriz ophiolite thrusted over limes ...
Extensional origin of ductile fabrics in the Schist Belt, Central Brooks
... deformation with structural depth. D 2 strain decreases markedly about 10 km north of the fault zone, so that the earlier foliation is no longer transposed into $2, and relict MI minerals (garnet, chloritoid) are preserved. Our data suggest that high-strain tectonites along the southern margin of th ...
... deformation with structural depth. D 2 strain decreases markedly about 10 km north of the fault zone, so that the earlier foliation is no longer transposed into $2, and relict MI minerals (garnet, chloritoid) are preserved. Our data suggest that high-strain tectonites along the southern margin of th ...
vauchez_etal_rheology_1998_hal
... the tectonic behaviour of the lithosphere. Lateral rheological heterogeneity of the continental lithosphere may result from various sources, with variations in geothermal gradient being the principal one. The oldest domains of continents, the cratonic nuclei, are characterized by a relatively cold, ...
... the tectonic behaviour of the lithosphere. Lateral rheological heterogeneity of the continental lithosphere may result from various sources, with variations in geothermal gradient being the principal one. The oldest domains of continents, the cratonic nuclei, are characterized by a relatively cold, ...
METAMORPHIC ROCKS
... low heat flow. By this definition it overlaps with diagenesis in sediments and with the lower grades of regional metamorphism. But the latter is more usually associated with areas of higher heat flow. Burial metamorphism was discovered by a geologist named Coombs in New Zealand when he found zeolite ...
... low heat flow. By this definition it overlaps with diagenesis in sediments and with the lower grades of regional metamorphism. But the latter is more usually associated with areas of higher heat flow. Burial metamorphism was discovered by a geologist named Coombs in New Zealand when he found zeolite ...
hall_church_comments
... that the less fractionated part of the stratiform unit is younger than the more fractionated part謡 hich it nevertheless underlies. In this respect the plutonic series likely correlates with either the older low-Ti series of the BG and LPL, or with the younger low-Ti series of the UPL. I am not aware ...
... that the less fractionated part of the stratiform unit is younger than the more fractionated part謡 hich it nevertheless underlies. In this respect the plutonic series likely correlates with either the older low-Ti series of the BG and LPL, or with the younger low-Ti series of the UPL. I am not aware ...
Research Article
... rocks, deformation structures caused by three different phases ( D l , D2 and D3) of ductile deformation have been recognized (Okudaira et al. 1993, 1995). Deformation structures resulting from D1 and D3 are commonly observed, while the occurrence of the D2 structure is limited. In all the rocks, D1 ...
... rocks, deformation structures caused by three different phases ( D l , D2 and D3) of ductile deformation have been recognized (Okudaira et al. 1993, 1995). Deformation structures resulting from D1 and D3 are commonly observed, while the occurrence of the D2 structure is limited. In all the rocks, D1 ...
Indonesia The geology and tectonic evolution of the Bacan region
... types of material recognized in this suite: ophiolitic rocks, most of which are of lower crustal plutonic and mantle origin (microgabbros, gabbros and serpentinised harzburgites) with few volcanic rocks, and spatially-related rocks including unusual amphibole cumulates and many rocks with magmatic-t ...
... types of material recognized in this suite: ophiolitic rocks, most of which are of lower crustal plutonic and mantle origin (microgabbros, gabbros and serpentinised harzburgites) with few volcanic rocks, and spatially-related rocks including unusual amphibole cumulates and many rocks with magmatic-t ...
Geology of the Golden Gate Headlands
... rocks such as blueschist (high-pressure), amphibolite and eclogite (high-temperature). These rocks are typically highly fractured and disrupted and may be mixed together on a local scale to create what is called a mélange (French for “mixture” or “blend”). Franciscan rocks in the Bay Area range in a ...
... rocks such as blueschist (high-pressure), amphibolite and eclogite (high-temperature). These rocks are typically highly fractured and disrupted and may be mixed together on a local scale to create what is called a mélange (French for “mixture” or “blend”). Franciscan rocks in the Bay Area range in a ...
Geology of the Golden Gate Headlands
... rocks such as blueschist (high-pressure), amphibolite and eclogite (high-temperature). These rocks are typically highly fractured and disrupted and may be mixed together on a local scale to create what is called a mélange (French for “mixture” or “blend”). Franciscan rocks in the Bay Area range in a ...
... rocks such as blueschist (high-pressure), amphibolite and eclogite (high-temperature). These rocks are typically highly fractured and disrupted and may be mixed together on a local scale to create what is called a mélange (French for “mixture” or “blend”). Franciscan rocks in the Bay Area range in a ...
The Mulu Shear Zone ~ a major structural feature of NW Borneo
... Onshore, in western Sabah, the NNE-trending Kiulu lineament has been identified on Landsat imagery by Lee (1980). Roadcuts i~tersecting the lineament show that it is an intensely disturbed zone with shearing in the sandstones and shales and folds indicate a east-dipping thrust zone. The subparallel ...
... Onshore, in western Sabah, the NNE-trending Kiulu lineament has been identified on Landsat imagery by Lee (1980). Roadcuts i~tersecting the lineament show that it is an intensely disturbed zone with shearing in the sandstones and shales and folds indicate a east-dipping thrust zone. The subparallel ...
Studi keberadaan logam logam penting (critical metal) dan logam
... Xunwu is relatively enriched in lanthanum. Both ores have relatively low cerium content, suggesting deposition from REE-bearing groundwater with depleted cerium that results from the element’s insolubility in the oxidized (Ce+4) state. The ore bodies are 3 to 10 m thick and occur mainly in a wholly ...
... Xunwu is relatively enriched in lanthanum. Both ores have relatively low cerium content, suggesting deposition from REE-bearing groundwater with depleted cerium that results from the element’s insolubility in the oxidized (Ce+4) state. The ore bodies are 3 to 10 m thick and occur mainly in a wholly ...
1 01:29:27:18 01:29:31:00 Annenberg Media 2 01:29:31:02 01:30
... IN RESPONSE TO THE IDEA OF WHAT WAS THE ORIGIN-01:41:10:25 WHAT IS THE ORIGIN OF GRANITE? ...
... IN RESPONSE TO THE IDEA OF WHAT WAS THE ORIGIN-01:41:10:25 WHAT IS THE ORIGIN OF GRANITE? ...
1. Introduction - GEIN-NOA
... The regional Pg-Q Upper Thracian Depression (WNW-ESE) is one of the most mobile structural units in the region of South and SE Bulgaria. It is more then 150 k long and up to 50 km wide. The local Pg-Q NE Rhodope and the Pg-Q Momchilgrad Depressions are to the S and in vicinity with the Upper Thracia ...
... The regional Pg-Q Upper Thracian Depression (WNW-ESE) is one of the most mobile structural units in the region of South and SE Bulgaria. It is more then 150 k long and up to 50 km wide. The local Pg-Q NE Rhodope and the Pg-Q Momchilgrad Depressions are to the S and in vicinity with the Upper Thracia ...
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... spaced phenocrysts in a microaplitic quartz-feldspar. The intrusive ranges in age from the Mesozoic to the Cenozoic and in composition from tonalite to granite. Ore is found in stockwork veinlets and random grains in the intrusive and surrounding fractures. The ore includes chalcopyrite, pyrite, and ...
... spaced phenocrysts in a microaplitic quartz-feldspar. The intrusive ranges in age from the Mesozoic to the Cenozoic and in composition from tonalite to granite. Ore is found in stockwork veinlets and random grains in the intrusive and surrounding fractures. The ore includes chalcopyrite, pyrite, and ...
ch09 - earthjay science
... Trans-Hudson belt contains the sedimentary record of a Wilson Cycle, with evidence of: 1. Rifting 2. Opening of an ocean basin 3. Deposition of sediment 4. Closure of the ocean basin along a subduction zone, associated with folding, metamorphism, and igneous intrusions. This closure welded the Super ...
... Trans-Hudson belt contains the sedimentary record of a Wilson Cycle, with evidence of: 1. Rifting 2. Opening of an ocean basin 3. Deposition of sediment 4. Closure of the ocean basin along a subduction zone, associated with folding, metamorphism, and igneous intrusions. This closure welded the Super ...
1 Chapter 4
... Classifying Igneous Rocks Pegmatite Pegmatite is a rock type closely related to granite that contains many minerals not ordinarily found in other igneous rocks. By definition, pegmatites contain crystals that measure at least 1 cm across. Typically they form in waterrich magmas ...
... Classifying Igneous Rocks Pegmatite Pegmatite is a rock type closely related to granite that contains many minerals not ordinarily found in other igneous rocks. By definition, pegmatites contain crystals that measure at least 1 cm across. Typically they form in waterrich magmas ...
Crustal thinning of the northern continental margin of the South
... and 118.5 E. To examine the crustal features of the corresponding continent–ocean transition zone, we have studied the crustal structures of the northern continental margin of the SCS. We have also performed gravity modeling by using a simple four-layer crustal model to understand the geometry of t ...
... and 118.5 E. To examine the crustal features of the corresponding continent–ocean transition zone, we have studied the crustal structures of the northern continental margin of the SCS. We have also performed gravity modeling by using a simple four-layer crustal model to understand the geometry of t ...
Great Lakes tectonic zone
The Great Lakes tectonic zone is bounded by South Dakota at its tip and heads northeast to south of Duluth, Minnesota, then heads east through northern Wisconsin, Marquette, Michigan, and then trends more northeasterly to skim the northern-most shores of lakes Michigan and Huron before ending in the Sudbury, Ontario, Canada, area.During the Late Archean Era the Algoman orogeny added landmass to the Superior province by volcanic activity and continental collision along a boundary that stretches from present-day South Dakota, U.S., into the Lake Huron region near Sudbury, Ontario, Canada.This crustal boundary is the Great Lakes tectonic zone. It is 1,400 km (870 mi) long, and separates the older Archean gneissic terrane to the south from younger Late Archean greenstone-granite terrane to the north.The zone is characterized by active compression during the Algoman orogeny (about 2,700 million years ago), a pulling-apart (extensional) tectonics (2,450 to 2,100 million years ago), a second compression during the Penokean orogeny (1,900 to 1,850 million years ago), a second extension during Middle Proterozoic time (1,600 million years ago) and minor reactivation during Phanerozoic time (the past 500 million years).Collision began along the Great Lakes tectonic zone (GLTZ) with the Algoman mountain-building event and continued for tens of millions of years. During the formation of the GLTZ, the gneissic Minnesota River Valley subprovince was thrust up onto the Superior province's edge as it consumed the Superior province's oceanic crust. Fragmentation of the Kenorland supercontinent began 2,450 million years ago and was completed by 2,100 million years ago. The Wyoming province is the continental landmass that is hypothesized to have rifted away from the southern Superior province portion of Kenorland, before moving rapidly west and docking with the Laurentia supercontinent 1,850 to 1,715 million years ago. Sedimentation from the GLTZ-rifting environment continued into the Penokean orogeny, which is the next major tectonic event in the Great Lakes region. Several earthquakes have been documented in Minnesota, Michigan's Upper Peninsula and Sudbury in the last 120 years along the GLTZ.