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Constraints on the Lithospheric Structure of Venus from Mechanical
... Study Project, 1981,pp. 682-685]. A diabasecrustis assumed Stylesof UnstableDeformation on the basis of Venera lander results that show surface rocks ...
... Study Project, 1981,pp. 682-685]. A diabasecrustis assumed Stylesof UnstableDeformation on the basis of Venera lander results that show surface rocks ...
Complementi di Petrografia N.O Scienze Geologiche, Lezione n. 3
... The above temperature ranges thus represent the upper temperature limits for crustal metamorphism. At mantle conditions the temperature limit of metamorphism rises significantly, solid state changes in this environments being attained at much higher temperatures. Figure 1B shows the solidus curves o ...
... The above temperature ranges thus represent the upper temperature limits for crustal metamorphism. At mantle conditions the temperature limit of metamorphism rises significantly, solid state changes in this environments being attained at much higher temperatures. Figure 1B shows the solidus curves o ...
A model of intracratonic basin formation, entailing deep crustal
... assumed to provide the impetus for metamorphic driven subsidence in intracratonic basins. Although metamorphism will occur at the low grade and sediment-greenschist facies boundary, it will only be slight for the changes in geotherm considered here and its effect is neglected. It can be seen immedia ...
... assumed to provide the impetus for metamorphic driven subsidence in intracratonic basins. Although metamorphism will occur at the low grade and sediment-greenschist facies boundary, it will only be slight for the changes in geotherm considered here and its effect is neglected. It can be seen immedia ...
precambrian geology of the truchas peaks region, north
... east side of the Rio Grande valley in north-central New Mexico. Most of the western part of the uplift consists of a complex Precambrian granitic batholith, termed the Embudo granite by Montgomery (Miller and others, 1963). A major north-south fault forms the eastern boundary of the granitic terrane ...
... east side of the Rio Grande valley in north-central New Mexico. Most of the western part of the uplift consists of a complex Precambrian granitic batholith, termed the Embudo granite by Montgomery (Miller and others, 1963). A major north-south fault forms the eastern boundary of the granitic terrane ...
Tectonic Framework of Basin Evolution in Peru
... Sedimentary basins are accumulations of sediments that are accommodated by subsidence of the brittle crust by tectonic and structural processes. The petroleum systems and prospectivity of any particular basin depend upon the tectonic-structural framework and the sedimentary response to the patterns ...
... Sedimentary basins are accumulations of sediments that are accommodated by subsidence of the brittle crust by tectonic and structural processes. The petroleum systems and prospectivity of any particular basin depend upon the tectonic-structural framework and the sedimentary response to the patterns ...
Moho and magmatic underplating
... the crust or at its base, i.e. as underplated material. In the following, we mainly focus on intraplate settings and the effects of the interaction of tectonic and magmatic processes that lead to intrusion of magma around the Moho. Underplating and intrusion of magma into the crust and uppermost man ...
... the crust or at its base, i.e. as underplated material. In the following, we mainly focus on intraplate settings and the effects of the interaction of tectonic and magmatic processes that lead to intrusion of magma around the Moho. Underplating and intrusion of magma into the crust and uppermost man ...
univERsity oF copEnhAGEn
... the crust or at its base, i.e. as underplated material. In the following, we mainly focus on intraplate settings and the effects of the interaction of tectonic and magmatic processes that lead to intrusion of magma around the Moho. Underplating and intrusion of magma into the crust and uppermost man ...
... the crust or at its base, i.e. as underplated material. In the following, we mainly focus on intraplate settings and the effects of the interaction of tectonic and magmatic processes that lead to intrusion of magma around the Moho. Underplating and intrusion of magma into the crust and uppermost man ...
44. Mesozoic-Cenozoic Geology of the Eastern Margin of the Grand
... Banks is preserved in this basin, its structure and stratigraphy are reviewed briefly in the following. These results are then extrapolated—mainly with geophysical data—to the eastern margin of the Grand Banks, where comparatively few wells have been drilled. ...
... Banks is preserved in this basin, its structure and stratigraphy are reviewed briefly in the following. These results are then extrapolated—mainly with geophysical data—to the eastern margin of the Grand Banks, where comparatively few wells have been drilled. ...
Papers presented to the Conference on Heat and Detachment in
... within this band but occur as domains segmented by sharp or transitional boundaries. In northern Sonora extensive outcrops of Tgn-s exist between the Mojave-Sonora megashear and a series of straight, northwesterly-trending lineaments which are interpreted as normal faults, orthogonal to the stretchi ...
... within this band but occur as domains segmented by sharp or transitional boundaries. In northern Sonora extensive outcrops of Tgn-s exist between the Mojave-Sonora megashear and a series of straight, northwesterly-trending lineaments which are interpreted as normal faults, orthogonal to the stretchi ...
Geothermal gradients in continental magmatic arcs: Constraints from
... even if these considerations can be addressed adequately, a more important uncertainty arises from the fact that much of the heat in continental arcs may be advected by magma. The thermal histories that result from such heating are very different from those in classical regional metamorphic terranes ...
... even if these considerations can be addressed adequately, a more important uncertainty arises from the fact that much of the heat in continental arcs may be advected by magma. The thermal histories that result from such heating are very different from those in classical regional metamorphic terranes ...
the complex tectonic events and their influence on formation
... formation of mineral deposits (mainly endogenic ores) within the northwestern Vietnam (NWVN). The dissertation will provide a synthetic elaboration of geological history of the northwestern Vietnam, presentation of major tectonic events based on magmatic processes and related to distribution of mine ...
... formation of mineral deposits (mainly endogenic ores) within the northwestern Vietnam (NWVN). The dissertation will provide a synthetic elaboration of geological history of the northwestern Vietnam, presentation of major tectonic events based on magmatic processes and related to distribution of mine ...
Catastrophic Granite Formation Rapid Melting of
... Ranges batholith just south of it, are part of a discontinuous belt of batholiths that circle the Pacific Ocean basin. For example, granite batholiths are found all through the coastal ranges along the west coast of South America and extend northward from the Sierra Nevada through Idaho and Montana, ...
... Ranges batholith just south of it, are part of a discontinuous belt of batholiths that circle the Pacific Ocean basin. For example, granite batholiths are found all through the coastal ranges along the west coast of South America and extend northward from the Sierra Nevada through Idaho and Montana, ...
The ocean-continent transition in the uniform lithospheric stretching
... Over the past 10 years, a considerable number of data have been acquired including those of Glomar Challenger Legs 48 and 80. The structure of the northern Bay of Biscay margin is featured by a series of horsts, graben and tilted fault blocks buried beneath a thin sedimentary cover that has been onl ...
... Over the past 10 years, a considerable number of data have been acquired including those of Glomar Challenger Legs 48 and 80. The structure of the northern Bay of Biscay margin is featured by a series of horsts, graben and tilted fault blocks buried beneath a thin sedimentary cover that has been onl ...
Plate-Tectonics A review
... Dense oceanic crust is subducted beneath lighter Continental crust, resulting in the formation of an oceanic trench and a linear volcanic mountain range. Melting occurs both in the downgoing slab and in the crust producing large diversity of volcanic rocks. Also Earthquakes along Bebioff Zone. ...
... Dense oceanic crust is subducted beneath lighter Continental crust, resulting in the formation of an oceanic trench and a linear volcanic mountain range. Melting occurs both in the downgoing slab and in the crust producing large diversity of volcanic rocks. Also Earthquakes along Bebioff Zone. ...
Archaean plate tectonics revisited 1. Heat flow, spreading rate, and
... propose mechanisms by which the planetary ...
... propose mechanisms by which the planetary ...
Meteorite Impacts as Triggers to Large Igneous Provinces
... activity (impact-induced volcanism) has been around for stratigraphy demonstrates that the impact event immediseveral decades. A meteorite impact was proposed to ately predated the LIP, and if the initial chemistry of the explain the differentiated melts of the Sudbury Igneous LIP, where underlain b ...
... activity (impact-induced volcanism) has been around for stratigraphy demonstrates that the impact event immediseveral decades. A meteorite impact was proposed to ately predated the LIP, and if the initial chemistry of the explain the differentiated melts of the Sudbury Igneous LIP, where underlain b ...
Tectonic evolution of the San Juan Islands thrust system, Washington
... The age of assembly of the nappes is uncertain because observed structures could potentially have formed during one of many tectonic events, including initial accretion going back to the Paleozoic for the older terranes, post-accretionary terrane translation of at least hundreds of kilometers, empla ...
... The age of assembly of the nappes is uncertain because observed structures could potentially have formed during one of many tectonic events, including initial accretion going back to the Paleozoic for the older terranes, post-accretionary terrane translation of at least hundreds of kilometers, empla ...
Continental crust generated in oceanic arcs
... Subduction of the Galápagos tracks resulted in lavas enriched in incompatible elements with Galápagos isotopic compositions8,9 (Fig. 1). A shift from dominantly basaltic to more andesitic compositions (for example, increase in SiO2 and K2 O, Fig. 2), reaching continental crust values2 , represents a ...
... Subduction of the Galápagos tracks resulted in lavas enriched in incompatible elements with Galápagos isotopic compositions8,9 (Fig. 1). A shift from dominantly basaltic to more andesitic compositions (for example, increase in SiO2 and K2 O, Fig. 2), reaching continental crust values2 , represents a ...
Relationship between Moldanubicum, the Kutn· Hora Crystalline
... The relationships of these units to the Moldanubicum s. s. have been explained in different ways, but especially the relationships with the Bohemicum and the lowermost part of the Kutn· Hora Crystalline Unit (KHCU) remained unclear. Boundaries between the above mentioned units are exposed in the S·z ...
... The relationships of these units to the Moldanubicum s. s. have been explained in different ways, but especially the relationships with the Bohemicum and the lowermost part of the Kutn· Hora Crystalline Unit (KHCU) remained unclear. Boundaries between the above mentioned units are exposed in the S·z ...
ABSTRACT The gneiss complex around and north of Pouso Alegre
... and petrography of these gneisses. A typical aspect is the occurrence of mafic shlieren and clots of hornblende and garnet in many of these rocks which might lead one to suppose that they are restites or residual source material as in the examples discussed by Chappell et al. (1987). However, there ...
... and petrography of these gneisses. A typical aspect is the occurrence of mafic shlieren and clots of hornblende and garnet in many of these rocks which might lead one to suppose that they are restites or residual source material as in the examples discussed by Chappell et al. (1987). However, there ...
Characteristic thermal regimes of plate tectonics
... belts in the rock record registers contemporary sites of high heat flow, inferred to be similar to modern arcs, abd backarcs, or orogenic hinterlands, where more extreme temperatures were imposed on crustal rocks than previously recorded. Blueschists first became evident in the Neoproterozoic rock r ...
... belts in the rock record registers contemporary sites of high heat flow, inferred to be similar to modern arcs, abd backarcs, or orogenic hinterlands, where more extreme temperatures were imposed on crustal rocks than previously recorded. Blueschists first became evident in the Neoproterozoic rock r ...
EAST AFRICAN RIFT SYSTEM
... eruptive fissures, local concentration of high activity may show up as possible geothermal targets. ...
... eruptive fissures, local concentration of high activity may show up as possible geothermal targets. ...
Evolution of the Precambrian Rocks of Yellowstone National Park
... In the northern YNP the Jardine Metasedimentary Sequence has been intruded by two main igneous bodies: the Crevice Pluton and the Hellroaring Pluton. A dynamic mix of different contact relations were observed adjacent to the Crevice and the Hellroaring Plutons. Locally, there are areas of sharp cros ...
... In the northern YNP the Jardine Metasedimentary Sequence has been intruded by two main igneous bodies: the Crevice Pluton and the Hellroaring Pluton. A dynamic mix of different contact relations were observed adjacent to the Crevice and the Hellroaring Plutons. Locally, there are areas of sharp cros ...
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... at accretionary “Pacific-type” or collisional “Alpine” type orogens (Ernst, 2005). Suture zones are often marked by ophiolites, which are best preserved where collision is of moderate intensity. Terminal collision between continents results in intense deformation and erosion that can largely remove ...
... at accretionary “Pacific-type” or collisional “Alpine” type orogens (Ernst, 2005). Suture zones are often marked by ophiolites, which are best preserved where collision is of moderate intensity. Terminal collision between continents results in intense deformation and erosion that can largely remove ...
Evolution of the middle and lower crust during the transition from
... 2007). We obtained the first direct measure of changing lowercrustal flow fields over length scales of several hundred square kilometers during this transitional period. The exposures allowed us to relate the kinematic evolution of different fabrics in areas that record distinctive histories of magm ...
... 2007). We obtained the first direct measure of changing lowercrustal flow fields over length scales of several hundred square kilometers during this transitional period. The exposures allowed us to relate the kinematic evolution of different fabrics in areas that record distinctive histories of magm ...
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.