![QUARTZ XENOCRYSTS IN OLIVINE BASALT FROM THE](http://s1.studyres.com/store/data/004825083_1-a97239371f5ce13f7f89a644ae7da469-300x300.png)
QUARTZ XENOCRYSTS IN OLIVINE BASALT FROM THE
... (6) The Niggerhead. On the northern edge of the Kernville quadrangle, basalt caps 75-100 feet thick form a large monolith-like mass.The lava cap is astride a contact zone between the two major batholithic units (granodiorite and quartz diorite) of the Southern Sierra Nevada. (7) Main Canyon of the K ...
... (6) The Niggerhead. On the northern edge of the Kernville quadrangle, basalt caps 75-100 feet thick form a large monolith-like mass.The lava cap is astride a contact zone between the two major batholithic units (granodiorite and quartz diorite) of the Southern Sierra Nevada. (7) Main Canyon of the K ...
Evolution of the Indian Continental Lithosphere: Insights from
... of distinction, the Indian shield lithosphere may be expected to have a dominantly Proterozoic stamp with Archaean lithospheric properties preserved below the Western Dharwar Craton, the Singhbhum Cratonic block and the Bundelkhand cratonic blocks. In the rest of the Shield more dispersed Archaean – ...
... of distinction, the Indian shield lithosphere may be expected to have a dominantly Proterozoic stamp with Archaean lithospheric properties preserved below the Western Dharwar Craton, the Singhbhum Cratonic block and the Bundelkhand cratonic blocks. In the rest of the Shield more dispersed Archaean – ...
View Entire Bulletin - Ministry of Energy and Mines and Responsible
... both alkalicandcalc-alkalic ...
... both alkalicandcalc-alkalic ...
Chapter 2
... Rise (Atwater, 1970). The American and the Pacific plates began to slide past each other, changing the ambient stress field from one of convergence-driven compression to right-lateral shear. The consequences of both these large-scale stress fields extend far beyond the immediate zone of plate intera ...
... Rise (Atwater, 1970). The American and the Pacific plates began to slide past each other, changing the ambient stress field from one of convergence-driven compression to right-lateral shear. The consequences of both these large-scale stress fields extend far beyond the immediate zone of plate intera ...
5.2 Sandstones
... petromict conglomerates. Fig. 5.8 A. Clast-supported conglomerate underlying laminated sands. Terrace deposits (Holocene) of the Umpqua River, southwest Oregon. B. Large breccia clasts (dark) cemented Sedimentary Geology Dept. Earth Sciences National Central U.with Taiwan calcite. Nevada Limestone ( ...
... petromict conglomerates. Fig. 5.8 A. Clast-supported conglomerate underlying laminated sands. Terrace deposits (Holocene) of the Umpqua River, southwest Oregon. B. Large breccia clasts (dark) cemented Sedimentary Geology Dept. Earth Sciences National Central U.with Taiwan calcite. Nevada Limestone ( ...
Chapter 21: Metamorphism
... • Uplift and erosion • Metamorphism often continues after major deformation ceases Metamorphic pattern is simpler than the structural one • Pattern of increasing metamorphic grade from both directions toward the core area From Understanding Earth, Press and Siever. Freeman. ...
... • Uplift and erosion • Metamorphism often continues after major deformation ceases Metamorphic pattern is simpler than the structural one • Pattern of increasing metamorphic grade from both directions toward the core area From Understanding Earth, Press and Siever. Freeman. ...
CENOZOIC HISTORY OF THE CHUYA DEPRESSION (Gorny Altai
... deformations that reactivated Late Paleozoic regional faults. The neotectonics of southeastern Altai is related to the structure and geodynamic evolution of the junction zone between the Dzungarian and Tuva-Mongolia microplates [14] which repeatedly came into interaction and either thrust over one a ...
... deformations that reactivated Late Paleozoic regional faults. The neotectonics of southeastern Altai is related to the structure and geodynamic evolution of the junction zone between the Dzungarian and Tuva-Mongolia microplates [14] which repeatedly came into interaction and either thrust over one a ...
A. Mills, T. Calon and C. Peddle - Department of Natural Resources
... The Bonavista Peninsula is divided into three Neoproterozoic siliciclastic tectonostratigraphic domains including, from west to east: the West domain comprising the 620–600 Ma arc-derived, turbiditic Connecting Point Group; the Central domain comprising mainly rocks of the terrestrial to marine, vol ...
... The Bonavista Peninsula is divided into three Neoproterozoic siliciclastic tectonostratigraphic domains including, from west to east: the West domain comprising the 620–600 Ma arc-derived, turbiditic Connecting Point Group; the Central domain comprising mainly rocks of the terrestrial to marine, vol ...
Chapter 21: Metamorphism
... • Metamorphism often continues after major deformation ceases Metamorphic pattern is simpler than the structural one • Pattern of increasing metamorphic grade from both directions toward the core area ...
... • Metamorphism often continues after major deformation ceases Metamorphic pattern is simpler than the structural one • Pattern of increasing metamorphic grade from both directions toward the core area ...
Lower plate deformation at the Chile Triple Junction from the
... regions (Figure 4b). Domains of down-dropped crust are present near both transform faults in the SW and NE corners of the deformed regions. A large block of uplifted oceanic lithosphere bounded by the eastern volcanic ridge (EVR) (Figures 3 and 4) marks the eastern limit of the eastern deformed regi ...
... regions (Figure 4b). Domains of down-dropped crust are present near both transform faults in the SW and NE corners of the deformed regions. A large block of uplifted oceanic lithosphere bounded by the eastern volcanic ridge (EVR) (Figures 3 and 4) marks the eastern limit of the eastern deformed regi ...
Tectonic Setting and Regional Geology of the KSZ
... low grade-metavolcanics have both ocean floor and island arc geochemical characters. Geochemistry of the post-tectonic intrusions indicates that the older plutons are calc-alkaline, medium-K, metaluminous and collisional related I-type diorite and granodiorite. They have trace element signature of s ...
... low grade-metavolcanics have both ocean floor and island arc geochemical characters. Geochemistry of the post-tectonic intrusions indicates that the older plutons are calc-alkaline, medium-K, metaluminous and collisional related I-type diorite and granodiorite. They have trace element signature of s ...
ARSENIDE VEIN SILVER, URANIUM
... Silver-bearing veins of the Silver Islet mine, within the Island Belt of veins in the Thunder Bay district, Ontario, are arsenide-rich. However, the more important and most typical Canadian representatives of the arsenide-silver-cobalt veins are deposits in the Cobalt district, Ontario. The deposits ...
... Silver-bearing veins of the Silver Islet mine, within the Island Belt of veins in the Thunder Bay district, Ontario, are arsenide-rich. However, the more important and most typical Canadian representatives of the arsenide-silver-cobalt veins are deposits in the Cobalt district, Ontario. The deposits ...
palaeontological heritage of north west
... 2.1 Ancient continental blocks and the Earliest Forms of Life The Kaapvaal Craton is one of the oldest single pieces of stable continental crust on Earth (McCarthy and Rubidge, 2005; Johnson et al, 2006) and dates back to the Archaean Eon up to 3600 million years ago. This geological treasure underl ...
... 2.1 Ancient continental blocks and the Earliest Forms of Life The Kaapvaal Craton is one of the oldest single pieces of stable continental crust on Earth (McCarthy and Rubidge, 2005; Johnson et al, 2006) and dates back to the Archaean Eon up to 3600 million years ago. This geological treasure underl ...
Insight into collision zone dynamics from topography
... A. D. Bottrill et al.: Insight into collision zone dynamics from topography wedge region. There is also evidence from mantle tomography that slab break-off has occurred at the Arabia-Eurasia collision zone (Lei and Zhao, 2007), which shows low velocity regions where the slab would be expected. Thes ...
... A. D. Bottrill et al.: Insight into collision zone dynamics from topography wedge region. There is also evidence from mantle tomography that slab break-off has occurred at the Arabia-Eurasia collision zone (Lei and Zhao, 2007), which shows low velocity regions where the slab would be expected. Thes ...
Granitoids in Poland, AM Monograph No
... Lipowe Hills massif. It contains orthogneisses which yielded Early Ordovician (~500±7 to 5 Ma) zircon age values (Oliver et al. 1993; Kröner, Mazur 2003; Oberc-Dziedzic et al. 2003b), and the dark, fine-grained gneiss. The intercalations of dark gneiss with mica schists and amphibolites are interpre ...
... Lipowe Hills massif. It contains orthogneisses which yielded Early Ordovician (~500±7 to 5 Ma) zircon age values (Oliver et al. 1993; Kröner, Mazur 2003; Oberc-Dziedzic et al. 2003b), and the dark, fine-grained gneiss. The intercalations of dark gneiss with mica schists and amphibolites are interpre ...
Glossary Accommodation zone—Accommodation zone is the zone
... Dip-slip fault—Fault structure, where the majority of displacement is accomplished by a dipslip (Biddle & Christie-Blick 1985; modified from Bates & Jackson 1980). Disorganized sea-floor spreading—Disorganized sea-floor spreading takes place for several years after continental break-up. An example o ...
... Dip-slip fault—Fault structure, where the majority of displacement is accomplished by a dipslip (Biddle & Christie-Blick 1985; modified from Bates & Jackson 1980). Disorganized sea-floor spreading—Disorganized sea-floor spreading takes place for several years after continental break-up. An example o ...
The structure of the upper mantle beneath the Delamerian and
... boundary that extends in depth to at least 15 km. Due to the presence of reflections in the hanging wall that resemble ramp anticlines, they interpret the fault to be a thrust, with the Lachlan Orogen thrust westward over the upper part of the Delamerian Orogen. Miller et al. (2005) propose a new tec ...
... boundary that extends in depth to at least 15 km. Due to the presence of reflections in the hanging wall that resemble ramp anticlines, they interpret the fault to be a thrust, with the Lachlan Orogen thrust westward over the upper part of the Delamerian Orogen. Miller et al. (2005) propose a new tec ...
Metamorphic Rocks Notes
... WHAT IS A METAMORPHIC ROCK? A metamorphic rock is a rock that has been changed by heat and/or pressure without completely melting. LAST ...
... WHAT IS A METAMORPHIC ROCK? A metamorphic rock is a rock that has been changed by heat and/or pressure without completely melting. LAST ...
HS Rocks - Net Texts
... Igneous rocks make up most of the rocks on Earth. Most igneous rocks are buried below the surface and covered with sedimentary rock, or are buried beneath the ocean water. In some places, geological processes have brought igneous rocks to the surface. Figure 1.11 shows a landscape in California’s Si ...
... Igneous rocks make up most of the rocks on Earth. Most igneous rocks are buried below the surface and covered with sedimentary rock, or are buried beneath the ocean water. In some places, geological processes have brought igneous rocks to the surface. Figure 1.11 shows a landscape in California’s Si ...
here - W. Steven Holbrook
... layers with velocities of 4.3–5.0 km/s and 5.2– 5.4 km/s may represent a downward increase in the abundance of plutons or increasing compaction of extrusive rocks. Despite the compositional variability of igneous rocks in the Aleutians, the predominant lava types are basalt and basaltic andesite (e. ...
... layers with velocities of 4.3–5.0 km/s and 5.2– 5.4 km/s may represent a downward increase in the abundance of plutons or increasing compaction of extrusive rocks. Despite the compositional variability of igneous rocks in the Aleutians, the predominant lava types are basalt and basaltic andesite (e. ...
HS Rocks
... Igneous rocks make up most of the rocks on Earth. Most igneous rocks are buried below the surface and covered with sedimentary rock, or are buried beneath the ocean water. In some places, geological processes have brought igneous rocks to the surface. Figure 1.11 shows a landscape in California’s Si ...
... Igneous rocks make up most of the rocks on Earth. Most igneous rocks are buried below the surface and covered with sedimentary rock, or are buried beneath the ocean water. In some places, geological processes have brought igneous rocks to the surface. Figure 1.11 shows a landscape in California’s Si ...
Dayem, K. E., G. A. Houseman, and P. Molnar (2009), Localization of shear along a lithospheric strength
... [2] Localized strain is observable at and near the surface of the earth as faulting. The Altyn Tagh fault zone of northern Tibet, one such example of localized strain, forms a major part of the boundary between the Tibetan plateau and the Tarim basin and accommodates strain resulting from convergenc ...
... [2] Localized strain is observable at and near the surface of the earth as faulting. The Altyn Tagh fault zone of northern Tibet, one such example of localized strain, forms a major part of the boundary between the Tibetan plateau and the Tarim basin and accommodates strain resulting from convergenc ...
39. crustal structure along the leg 152 drilling transect
... younger sediments (Figs. 1, 2). The rift lavas (the SDRS) therefore onlap the Precambrian (Archean to early Proterozoic) basement (Figs. 2–4). The onlap zone forms a crustal monoclinal, seaward flexure. This is different from the two northern margin segments where breakup took place within a complex ...
... younger sediments (Figs. 1, 2). The rift lavas (the SDRS) therefore onlap the Precambrian (Archean to early Proterozoic) basement (Figs. 2–4). The onlap zone forms a crustal monoclinal, seaward flexure. This is different from the two northern margin segments where breakup took place within a complex ...
Linking collisional and accretionary orogens during Rodinia
... history of Rodinian crustal blocks suggests that internal rifting and breakup of the supercontinent were linked to the initiation of subduction and development of accretionary orogens around its periphery. Thus, breakup was a top-down instigated process. The locus of convergence was initially around ...
... history of Rodinian crustal blocks suggests that internal rifting and breakup of the supercontinent were linked to the initiation of subduction and development of accretionary orogens around its periphery. Thus, breakup was a top-down instigated process. The locus of convergence was initially around ...
Late Variscan (Carboniferous to Permian) environments in the
... tivity during the latest Pennsylvanian. Several meters of thick dark shales containing abundant well preserved plant fossils are developed at the top of these megasequences. About 80 species of plant fossils have been described from the interbedded shales and thus suggest the Kasimovian—Gzhelian age ...
... tivity during the latest Pennsylvanian. Several meters of thick dark shales containing abundant well preserved plant fossils are developed at the top of these megasequences. About 80 species of plant fossils have been described from the interbedded shales and thus suggest the Kasimovian—Gzhelian age ...
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.