Tectonics and human evolution
... In more arid regions the camel played a comparable role over a similar time range. Even the hunting of large herbivore herds on the steppe-tundra of Pleistocene Europe and the grasslands of the Great Plains in North America seems to have appeared relatively late in the prehistoric sequence and perha ...
... In more arid regions the camel played a comparable role over a similar time range. Even the hunting of large herbivore herds on the steppe-tundra of Pleistocene Europe and the grasslands of the Great Plains in North America seems to have appeared relatively late in the prehistoric sequence and perha ...
geology and chromite deposits of the camaguey district camaguey
... beds, tentatively dated as Lower Cretaceous (Neocomian?). It was impossible, however, to map these formations as units in the field. CRETACEOUS ROCKS A series of volcanic rocks with interbedded limestones and radiolarian cherts lies unconformably on the serpentine. The volcanic sequence is composed ...
... beds, tentatively dated as Lower Cretaceous (Neocomian?). It was impossible, however, to map these formations as units in the field. CRETACEOUS ROCKS A series of volcanic rocks with interbedded limestones and radiolarian cherts lies unconformably on the serpentine. The volcanic sequence is composed ...
from elte.hu
... Canary Islands is probably best exemplified on Gran Canaria, the second largest island (Fig. 1). Its eruptive activity consisted of two volcanic stages typical of the Canaries: a complex shield-building and a rejuvenated stage, respectively (Schmincke, 1976; Carracedo, 1999; Carracedo et al., 2002). ...
... Canary Islands is probably best exemplified on Gran Canaria, the second largest island (Fig. 1). Its eruptive activity consisted of two volcanic stages typical of the Canaries: a complex shield-building and a rejuvenated stage, respectively (Schmincke, 1976; Carracedo, 1999; Carracedo et al., 2002). ...
pdf version - Berkeley Seismological Laboratory
... observations [Chen, 1992; Dick et al., 2003; White et al., 1992]. The volume of oceanic crust is then calculated by multiplying the thickness of oceanic crust by the area of the seafloor at a given age, with the age of the seafloor determined from magnetic anomalies on the seafloor [M€ uller et al., 19 ...
... observations [Chen, 1992; Dick et al., 2003; White et al., 1992]. The volume of oceanic crust is then calculated by multiplying the thickness of oceanic crust by the area of the seafloor at a given age, with the age of the seafloor determined from magnetic anomalies on the seafloor [M€ uller et al., 19 ...
Slavonian excursion
... according to Pamić, 1986; Pamić et al., 1988a; Pamić and Lanphere, 1991) surrounded by (b) migmatites and migmatitic gneisses that grade into (c) medium-grade (amphibolite facies) metamorphic sequences composed of garnetiferous amphibolites, paragneisses and micaschists. The Radlovac metamorphic com ...
... according to Pamić, 1986; Pamić et al., 1988a; Pamić and Lanphere, 1991) surrounded by (b) migmatites and migmatitic gneisses that grade into (c) medium-grade (amphibolite facies) metamorphic sequences composed of garnetiferous amphibolites, paragneisses and micaschists. The Radlovac metamorphic com ...
Subduction and the rock record: Concepts developed
... Unruh (1995) proposed that normal slip took place during one period of time along the ophiolite–Franciscan Complex contact and that tectonic wedging (and periodic thrust faulting along the contact) were operative during other periods (Fig. 2). Godfrey et al. (1997) presented evidence for a buried op ...
... Unruh (1995) proposed that normal slip took place during one period of time along the ophiolite–Franciscan Complex contact and that tectonic wedging (and periodic thrust faulting along the contact) were operative during other periods (Fig. 2). Godfrey et al. (1997) presented evidence for a buried op ...
Three-dimensional density structures of Taiwan and tectonic
... model that featured a steep eastward subduction with a tear at the ocean-continent boundary. Lin et al. (1998) suggested that the high velocities and extensional mechanisms in the eastern Central Range are the results of an ongoing exhumation of previously subducted continental crust. Lin (2000) als ...
... model that featured a steep eastward subduction with a tear at the ocean-continent boundary. Lin et al. (1998) suggested that the high velocities and extensional mechanisms in the eastern Central Range are the results of an ongoing exhumation of previously subducted continental crust. Lin (2000) als ...
The Lamington Conglomerate: further evidence for an ophiolitic
... Discussion: origin and provenance of the Lamington Conglomerate Member Many of the thickly bedded, turbiditic sandstones that dominate the Marchburn Formation are rich in detrital clinopyroxene (Styles et al., 1995), magnetite, and fragments of metabasalt, gabbro and serpentinite. Petrological (see ...
... Discussion: origin and provenance of the Lamington Conglomerate Member Many of the thickly bedded, turbiditic sandstones that dominate the Marchburn Formation are rich in detrital clinopyroxene (Styles et al., 1995), magnetite, and fragments of metabasalt, gabbro and serpentinite. Petrological (see ...
Geology Course Descriptions
... GEO 212 Historical Geology. An investigation of the physical and biologic processes that shape the earth and how those processes are recorded in the rock record. The geologic history of North America will be examined based on the evidence revealed by the rocks and fossils of the continent. Prerequis ...
... GEO 212 Historical Geology. An investigation of the physical and biologic processes that shape the earth and how those processes are recorded in the rock record. The geologic history of North America will be examined based on the evidence revealed by the rocks and fossils of the continent. Prerequis ...
Basaltic pillow mounds in the Vinalhaven intrusion
... plutons are only a few km thick, and lie above ma®c rocks (Hodge et al., 1982). 3. Geology of the Vinalhaven pluton The Vinalhaven pluton was emplaced into early Paleozoic, deformed, low grade schists of the Calderwood Formation and into essentially undeformed, Silurian volcanic rocks which may cont ...
... plutons are only a few km thick, and lie above ma®c rocks (Hodge et al., 1982). 3. Geology of the Vinalhaven pluton The Vinalhaven pluton was emplaced into early Paleozoic, deformed, low grade schists of the Calderwood Formation and into essentially undeformed, Silurian volcanic rocks which may cont ...
Global geochemical variation of mid-ocean ridge basalts - UiO
... The terms compatible and incompatible elements refer to the elements partitioning into crystal structures relative to coexisting melts. Compatible elements are elements that have higher affinity for the crystal structure of the minerals in the mantle compared to a partial melt. Therefore, compatible ...
... The terms compatible and incompatible elements refer to the elements partitioning into crystal structures relative to coexisting melts. Compatible elements are elements that have higher affinity for the crystal structure of the minerals in the mantle compared to a partial melt. Therefore, compatible ...
IM_chapter7 Metamorphic Rocks
... a particular range of temperatures and pressures. Each facies is named after its most characteristic rock or mineral. ...
... a particular range of temperatures and pressures. Each facies is named after its most characteristic rock or mineral. ...
Pacific Beach San Diego
... During the last 150 million years, Southern California has undergone vast geological land sculpturing. Volcanoes, earthquakes, landslides, weathering, and tectonic movement have all contributed to the present day face of Southern California. This paper will visit a few of the geologic timestamps tha ...
... During the last 150 million years, Southern California has undergone vast geological land sculpturing. Volcanoes, earthquakes, landslides, weathering, and tectonic movement have all contributed to the present day face of Southern California. This paper will visit a few of the geologic timestamps tha ...
Dependence of mid-ocean ridge morphology on spreading rate in
... used spreading rates of 50 mm/yr. A central accretion zone was also prescribed in the study by Ito and Behn (2008), which addressed the transition between fast and slow spreading, represented by the range of morphologies at intermediate spreading rates. Being 2-D, the studies cited in this paragraph ...
... used spreading rates of 50 mm/yr. A central accretion zone was also prescribed in the study by Ito and Behn (2008), which addressed the transition between fast and slow spreading, represented by the range of morphologies at intermediate spreading rates. Being 2-D, the studies cited in this paragraph ...
Toward the reconciliation of seismological and petrological
... oceanic domains this means that sampling is concentrated at or near the mid-ocean ridges, supplemented by limited information from peridotitic xenoliths away from the ridge. Usually, the xenoliths are associated with oceanic islands, which themselves represent tangible evidence for heterogeneity. Al ...
... oceanic domains this means that sampling is concentrated at or near the mid-ocean ridges, supplemented by limited information from peridotitic xenoliths away from the ridge. Usually, the xenoliths are associated with oceanic islands, which themselves represent tangible evidence for heterogeneity. Al ...
View it now - OSU Extension Catalog
... 6. Constructing explanations 8. Obtaining, evaluating, and communicating information ...
... 6. Constructing explanations 8. Obtaining, evaluating, and communicating information ...
Petrology Lecture 9 Review
... greenstone, and then progressively metamorphosed to higher temperatures, may reach the granulite facies with a chemistry dominated by plagioclase and pyroxene, like the protolith. However, it will differ from the protolith in one important respect, which is: 2. Granulites are thought to form in regi ...
... greenstone, and then progressively metamorphosed to higher temperatures, may reach the granulite facies with a chemistry dominated by plagioclase and pyroxene, like the protolith. However, it will differ from the protolith in one important respect, which is: 2. Granulites are thought to form in regi ...
Metamorphic Petrology Review
... greenstone, and then progressively metamorphosed to higher temperatures, may reach the granulite facies with a chemistry dominated by plagioclase and pyroxene, like the protolith. However, it will differ from the protolith in one important respect, which is: 2. Granulites are thought to form in regi ...
... greenstone, and then progressively metamorphosed to higher temperatures, may reach the granulite facies with a chemistry dominated by plagioclase and pyroxene, like the protolith. However, it will differ from the protolith in one important respect, which is: 2. Granulites are thought to form in regi ...
Primary structures
... are defined by the distribution of different minerals forming compositional banding. In coarse-grained (grains readily visible with the naked eye) metamorphic rocks such structures are generally termed GNEISSIC BANDING. But this is not a primary structure because metamorphic rocks themselves origina ...
... are defined by the distribution of different minerals forming compositional banding. In coarse-grained (grains readily visible with the naked eye) metamorphic rocks such structures are generally termed GNEISSIC BANDING. But this is not a primary structure because metamorphic rocks themselves origina ...
zeolites in eocene basaltic pillow lavas
... Alteration of basaltic glass, which was initially abundant, appears to have been an important factor in formation of the zeolites. Isotopic data suggest that zeolitization occurred during a low-temperature (60 ~ 70~ submarine hydrothermal event, or by reactions of cold (~ 10~ meteoric water with bas ...
... Alteration of basaltic glass, which was initially abundant, appears to have been an important factor in formation of the zeolites. Isotopic data suggest that zeolitization occurred during a low-temperature (60 ~ 70~ submarine hydrothermal event, or by reactions of cold (~ 10~ meteoric water with bas ...
A new look at the Altaids: A superorogenic complex in northern and
... That it is seen nowhere on earth today as depicted in Fig. 1C ...
... That it is seen nowhere on earth today as depicted in Fig. 1C ...
6. APPLICATION OF PHOTOINTERPRETATION TO GEOLOGY Two
... Sediments are deposited like pages of a book, in sheets. Sediment layers have various extensions, composed of different types of rock. Some are plastic, soft, like clays or shales; some are loose, granular, like sand and gravel; and some hard like sandstone and limestone. Layers of rock are laid dow ...
... Sediments are deposited like pages of a book, in sheets. Sediment layers have various extensions, composed of different types of rock. Some are plastic, soft, like clays or shales; some are loose, granular, like sand and gravel; and some hard like sandstone and limestone. Layers of rock are laid dow ...
Lithostratigraphic and tectonic framework of Jurassic
... Mesozoic volcanic and plutonic arc magmatic suites, marine and nonmarine clastic basins, high-grade metamorphic complexes, and accretionary rocks. Jurassic and Cretaceous clastic basins within this framework contain stratigraphy with hydrocarbon potential. The geology is complicated by Cretaceous to ...
... Mesozoic volcanic and plutonic arc magmatic suites, marine and nonmarine clastic basins, high-grade metamorphic complexes, and accretionary rocks. Jurassic and Cretaceous clastic basins within this framework contain stratigraphy with hydrocarbon potential. The geology is complicated by Cretaceous to ...
Large igneous province
A large igneous province (LIP) is an extremely large accumulation of igneous rocks, including liquid rock (intrusive) or volcanic rock formations (extrusive), when hot magma extrudes from inside the Earth and flows out. The source of many or all LIPs is variously attributed to mantle plumes or to processes associated with plate tectonics. Types of LIPs can include large volcanic provinces (LVP), created through flood basalt and large plutonic provinces (LPP). Eleven distinct flood basalt episodes occurred in the past 250 million years, creating volcanic provinces, which coincided with mass extinctions in prehistoric times. Formation depends on a range of factors, such as continental configuration, latitude, volume, rate, duration of eruption, style and setting (continental vs. oceanic), the preexisting climate state, and the biota resilience to change.