The Development of Highly Strained Rocks in the Pelican Window
... Reinvestigation in the summer of 1988 of shoreline outcrops on Pelican and Mirond Lakes (Lewry and Macdonald, 1988) revealed the presence of rocks more high· ly strained than previously explicitly documented, and suggested that some re-evaluation of protolith interpretations was required. This summe ...
... Reinvestigation in the summer of 1988 of shoreline outcrops on Pelican and Mirond Lakes (Lewry and Macdonald, 1988) revealed the presence of rocks more high· ly strained than previously explicitly documented, and suggested that some re-evaluation of protolith interpretations was required. This summe ...
Three‐dimensional field perspective on deformation, flow, and
... Figure 5. (a) Block diagram summarizing the relationships between migmatitic fabrics and shear zones in the granulite transition zone, as best exemplified in the Kabbaldurga quarries. (b) Synthetic representation of bulk, horizontal constrictional strain in the granulite transition zone. Strain is n ...
... Figure 5. (a) Block diagram summarizing the relationships between migmatitic fabrics and shear zones in the granulite transition zone, as best exemplified in the Kabbaldurga quarries. (b) Synthetic representation of bulk, horizontal constrictional strain in the granulite transition zone. Strain is n ...
Geology of Galapagos
... Galapagos is incomplete, probably even in recent years. The 1979 eruption of Cerro A d , from a vent low on its east flank, was well recognized in Galapagos (Moore, 1980b). But it was not until two years later that Moore, upon climbing to the summit, saw lava within the caldera that she did not reme ...
... Galapagos is incomplete, probably even in recent years. The 1979 eruption of Cerro A d , from a vent low on its east flank, was well recognized in Galapagos (Moore, 1980b). But it was not until two years later that Moore, upon climbing to the summit, saw lava within the caldera that she did not reme ...
The Tectonostratigraphy and Structural Evolution of the Sitas Area
... Within the Sitas area, the Middle K61 i Nappe Complex (MKNC) is composed of eleven informal lithotectonic units. Foss ils have not been found in any of these units ; thus, their age is unknown but is assumed to be early Paleozo ic. Primary structures are generally too poorly preserved to determine f ...
... Within the Sitas area, the Middle K61 i Nappe Complex (MKNC) is composed of eleven informal lithotectonic units. Foss ils have not been found in any of these units ; thus, their age is unknown but is assumed to be early Paleozo ic. Primary structures are generally too poorly preserved to determine f ...
Metallogenesis of the world`s ocean against the background
... Paulo, 1981; Strakhov, 1986) provided a starting-point for the present studies. It was accepted, that recognition of the rules of forming and origin distinctness of deep-sea polymetallic deposits is of a paramount importance for the systematics of these deposits. The following key, discriminating fa ...
... Paulo, 1981; Strakhov, 1986) provided a starting-point for the present studies. It was accepted, that recognition of the rules of forming and origin distinctness of deep-sea polymetallic deposits is of a paramount importance for the systematics of these deposits. The following key, discriminating fa ...
Geography-11 (Eng) - Punjab School Education Board | cPanel Login
... more than 60 satellites. Most of the satellites are unknown for mankind as far information about them is concerned. 6. Saturn : The sixth from sun and second largest planet in solar system is Saturn. Situated some 1,431 million kilometers (More than 143 crore km) away from Sun, it is constituted of ...
... more than 60 satellites. Most of the satellites are unknown for mankind as far information about them is concerned. 6. Saturn : The sixth from sun and second largest planet in solar system is Saturn. Situated some 1,431 million kilometers (More than 143 crore km) away from Sun, it is constituted of ...
Advances in Ni-Cu-PGE Sulphide Deposit Models and Implications
... It is commonly possible to identify groups of orebodies within one cluster or camp of temporally and spatially constrained deposits that have common empirical traits, and to then develop successful exploration technologies based on these similarities. Models developed for exploration for contact, fo ...
... It is commonly possible to identify groups of orebodies within one cluster or camp of temporally and spatially constrained deposits that have common empirical traits, and to then develop successful exploration technologies based on these similarities. Models developed for exploration for contact, fo ...
What drives microplate motion and deformation in the northeastern
... subduction of the Bahamas Platform beneath the Caribbean plate, hereafter refered to as “Bahamas Collision”, is usually invoked to explain differential velocities in the northeastern Caribbean plate boundary zone [Mann et al., 2002]. The Bahamas Platform itself, however, shows no signs of significa ...
... subduction of the Bahamas Platform beneath the Caribbean plate, hereafter refered to as “Bahamas Collision”, is usually invoked to explain differential velocities in the northeastern Caribbean plate boundary zone [Mann et al., 2002]. The Bahamas Platform itself, however, shows no signs of significa ...
petrology and isotope systematics of magma mushes
... Tabular K-feldspar megacrysts in the porphyritic granitoids weather in high relief from the matrix and accentuate the evidence that the Monte das Gameleiras pluton was intruded as a viscous, crystal-laden mush. In places, the megacrysts are aligned in faint swirls or ductile shears; elsewhere, they ...
... Tabular K-feldspar megacrysts in the porphyritic granitoids weather in high relief from the matrix and accentuate the evidence that the Monte das Gameleiras pluton was intruded as a viscous, crystal-laden mush. In places, the megacrysts are aligned in faint swirls or ductile shears; elsewhere, they ...
accepted manuscript
... model dates (Zuo et al., 1990a; He et al., 2005) yielded Precambrian ages, some of the rocks were interpreted as a Neoarchean-Paleoproterozoic “Beishan complex”, which rifted from the Tarim-Dunhuang block (Zuo et al., 1990a; Xu et al., 2009). However, the rocks have also been termed the Baishan Form ...
... model dates (Zuo et al., 1990a; He et al., 2005) yielded Precambrian ages, some of the rocks were interpreted as a Neoarchean-Paleoproterozoic “Beishan complex”, which rifted from the Tarim-Dunhuang block (Zuo et al., 1990a; Xu et al., 2009). However, the rocks have also been termed the Baishan Form ...
For pdf click here
... length of the Gulf of Aden to the Owen fracture zone. This includes the easternmost300km between the eastern edgesof Arabia and Africa to the Owen fracture zone where old oceanic lithosphere was rifted to form the ShebaRidge. Within this eastemmostregion the boundary betweenthe quiet zone and the ol ...
... length of the Gulf of Aden to the Owen fracture zone. This includes the easternmost300km between the eastern edgesof Arabia and Africa to the Owen fracture zone where old oceanic lithosphere was rifted to form the ShebaRidge. Within this eastemmostregion the boundary betweenthe quiet zone and the ol ...
ARTICLE IN PRESS - Do plumes exist?
... the oblique or lateral ramp of a thrust at shallow levels in an accretionary prism is steeper than the frontal ramp. Cruciani et al. (2005) reached similar conclusions of Lallemand et al. (2005) stating no correlation between slab age and dip of the slab, but their analysis is stopped to about 250 k ...
... the oblique or lateral ramp of a thrust at shallow levels in an accretionary prism is steeper than the frontal ramp. Cruciani et al. (2005) reached similar conclusions of Lallemand et al. (2005) stating no correlation between slab age and dip of the slab, but their analysis is stopped to about 250 k ...
Radiometric dating results 5
... In the Esrange area (Fig. 1) most of the major geological units are represented. The Archaean rocks to the north are overlain by Karelian rocks, which to the south are overlain by Svecofennian rocks. The upper part of the latter (Younger Svecofennian metasedimentary sequence) consists of clastic met ...
... In the Esrange area (Fig. 1) most of the major geological units are represented. The Archaean rocks to the north are overlain by Karelian rocks, which to the south are overlain by Svecofennian rocks. The upper part of the latter (Younger Svecofennian metasedimentary sequence) consists of clastic met ...
Chapter 7 Lecture PowerPoint Handout
... • The importance of parent rock– Most metamorphic rocks have the same overall chemical composition as the parent rock from which they formed – Mineral makeup determines, to a large extent, the degree to which each metamorphic agent will cause change ...
... • The importance of parent rock– Most metamorphic rocks have the same overall chemical composition as the parent rock from which they formed – Mineral makeup determines, to a large extent, the degree to which each metamorphic agent will cause change ...
The Role of Plate Tectonic-Climate Coupling and Exposed Land
... Plate tectonics plays a vital role in the operation of the long-term carbon cycle. Plate tectonics drives volcanism at ridges and arcs, the major sources of atmospheric CO2 , and facilitates silicate weathering, the primary sink of atmospheric CO2 , by providing a continuous supply of fresh, weather ...
... Plate tectonics plays a vital role in the operation of the long-term carbon cycle. Plate tectonics drives volcanism at ridges and arcs, the major sources of atmospheric CO2 , and facilitates silicate weathering, the primary sink of atmospheric CO2 , by providing a continuous supply of fresh, weather ...
Author`s personal copy - Freie Universität Berlin
... at least part of the period considered above. We emphasize that independent motion of the Adriatic microplate would allow for a more substantial component of east–west-directed subduction of oceanic lithosphere than predicted from Africa–Europe plate convergence. This subduction must have affected A ...
... at least part of the period considered above. We emphasize that independent motion of the Adriatic microplate would allow for a more substantial component of east–west-directed subduction of oceanic lithosphere than predicted from Africa–Europe plate convergence. This subduction must have affected A ...
Reconciling plate-tectonic reconstructions of Alpine
... at least part of the period considered above. We emphasize that independent motion of the Adriatic microplate would allow for a more substantial component of east–west-directed subduction of oceanic lithosphere than predicted from Africa–Europe plate convergence. This subduction must have affected A ...
... at least part of the period considered above. We emphasize that independent motion of the Adriatic microplate would allow for a more substantial component of east–west-directed subduction of oceanic lithosphere than predicted from Africa–Europe plate convergence. This subduction must have affected A ...
Chapter 7 metamorphic rocks-w-2017
... contain water in their crystalline structures. Elevated temperatures and pressures cause the dehydration of these minerals. Once expelled, these hot fluids promote recrystallization by enhancing the migration of mineral matter. As discussed earlier, the metamorphism of shale to slate involves clay m ...
... contain water in their crystalline structures. Elevated temperatures and pressures cause the dehydration of these minerals. Once expelled, these hot fluids promote recrystallization by enhancing the migration of mineral matter. As discussed earlier, the metamorphism of shale to slate involves clay m ...
Today`s Quiz -
... 1) The less dense the crust, the more buoyant it is with respect to the mantle and the greater elevation it will “float”. Conversely, the more dense the curst, the lower it “floats” and thus will have lower elevation. 2) The thicker the crust, the greater its “floating” elevation and vise versa. ...
... 1) The less dense the crust, the more buoyant it is with respect to the mantle and the greater elevation it will “float”. Conversely, the more dense the curst, the lower it “floats” and thus will have lower elevation. 2) The thicker the crust, the greater its “floating” elevation and vise versa. ...
Plate-kinematics and crustal dynamics of circum
... a polyphase tectonic history. Plate kinematic models and reconstructions back to the Jurassic show that Mesozoic separation of the Americas produced passive margins that were overridden diachronously from west to east by allochthonous Caribbean plate–related arc and oceanic complexes. P-T-t and stru ...
... a polyphase tectonic history. Plate kinematic models and reconstructions back to the Jurassic show that Mesozoic separation of the Americas produced passive margins that were overridden diachronously from west to east by allochthonous Caribbean plate–related arc and oceanic complexes. P-T-t and stru ...
Geology of Nevada - Nevada Bureau of Mines and Geology
... locally by igneous activity, hot water shows up in numerous geothermal areas. Nevada produces approximately $100 million worth of geothermally generated electric power annually, and geothermal resources also are used for agriculture, industrial applications, and space heating. Nevada produces approx ...
... locally by igneous activity, hot water shows up in numerous geothermal areas. Nevada produces approximately $100 million worth of geothermally generated electric power annually, and geothermal resources also are used for agriculture, industrial applications, and space heating. Nevada produces approx ...
Volcanism and its Contribution to Mudrock Genesis
... since their influence requires detailed study of the fine-grained components by petrographic and X-ray diffraction methods. Volcanogenic sediments react with seawater to produce secondary phases such as zeolites and clay minerals. Typical mudrock clay minerals derived by the alteration of tephra inc ...
... since their influence requires detailed study of the fine-grained components by petrographic and X-ray diffraction methods. Volcanogenic sediments react with seawater to produce secondary phases such as zeolites and clay minerals. Typical mudrock clay minerals derived by the alteration of tephra inc ...
earthquakes - New Scientist
... line (see diagram, below left). Another half-century elapsed before the plate tectonics revolution of the mid-20th century provided an explanation for the more fundamental question: what drives earthquakes? We now know that most earthquakes are caused by the build-up of stress along the planet’s act ...
... line (see diagram, below left). Another half-century elapsed before the plate tectonics revolution of the mid-20th century provided an explanation for the more fundamental question: what drives earthquakes? We now know that most earthquakes are caused by the build-up of stress along the planet’s act ...
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.