The Central Asia collision zone: numerical present-day kinematics
... of the deformation related to the Arabia and India convergence against Eurasia. By combining geophysical and petrological information, the crust and upper mantle of the Zagros and the Himalaya-Tibetan orogens have been characterized from the thermal, compositional and seismological point of view. Fo ...
... of the deformation related to the Arabia and India convergence against Eurasia. By combining geophysical and petrological information, the crust and upper mantle of the Zagros and the Himalaya-Tibetan orogens have been characterized from the thermal, compositional and seismological point of view. Fo ...
View - Mid Wales Geology Club
... Adam Sedgwick was born in 1885 in the Yorkshire Dales; he went to Trinity College, Cambridge and it was his home for nearly seventy years. He began as a mathematician, becoming senior tutor in mathematics and winning a fellowship in 1810. Under the college statutes all but two of the fellows had to ...
... Adam Sedgwick was born in 1885 in the Yorkshire Dales; he went to Trinity College, Cambridge and it was his home for nearly seventy years. He began as a mathematician, becoming senior tutor in mathematics and winning a fellowship in 1810. Under the college statutes all but two of the fellows had to ...
Petrology Lecture 11
... • With hot, dry intrusions higher facies develop • The following reaction, which characterizes the pyroxene hornfels facies, occurs: Amphibole ➞ Opx + Cpx + Plag + Qtz ...
... • With hot, dry intrusions higher facies develop • The following reaction, which characterizes the pyroxene hornfels facies, occurs: Amphibole ➞ Opx + Cpx + Plag + Qtz ...
pdf version - Berkeley Seismological Laboratory
... 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., 1997, 2008]. The combination of geophysical measurements provides the most direct estimate of melt production at mi ...
... 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., 1997, 2008]. The combination of geophysical measurements provides the most direct estimate of melt production at mi ...
ABSTRACT The gneiss complex around and north of Pouso Alegre
... gneisses with amphibolite bodies in the form of layers or boudins. A later group of gneisses which also make up the complex comprises relatively leucocratic rocks ranging from tonalitic and granodioritic to granitic augen gneiss containing schlieren of mafic composition and at times fragments of dig ...
... gneisses with amphibolite bodies in the form of layers or boudins. A later group of gneisses which also make up the complex comprises relatively leucocratic rocks ranging from tonalitic and granodioritic to granitic augen gneiss containing schlieren of mafic composition and at times fragments of dig ...
Origin of the Bermuda volcanoes and Bermuda
... (Fig. 1; Rice et al., 1980). Based on the most recent age estimate for M-0 (125.0 +/- 1.0 Ma; Aptian-Barremian transition; Gradstein et al., 2004) and an assumed but poorly constrained spreading half-rate of 2 mm/a after M-0 time, we estimate the age of the oceanic crust under the Bermuda edifices a ...
... (Fig. 1; Rice et al., 1980). Based on the most recent age estimate for M-0 (125.0 +/- 1.0 Ma; Aptian-Barremian transition; Gradstein et al., 2004) and an assumed but poorly constrained spreading half-rate of 2 mm/a after M-0 time, we estimate the age of the oceanic crust under the Bermuda edifices a ...
Author`s personal copy - Freie Universität Berlin
... size of Alpine Tethys and the precise age of its demise. The gap in knowledge between plate-motion studies and field-based tectonic syntheses was large, primarily because modern structural petrology and geochronology were in their infancy and also because geologists were preoccupied with understandin ...
... size of Alpine Tethys and the precise age of its demise. The gap in knowledge between plate-motion studies and field-based tectonic syntheses was large, primarily because modern structural petrology and geochronology were in their infancy and also because geologists were preoccupied with understandin ...
Turkey Point Units 6 & 7 COL Application Part 2 — FSAR
... COL Application Part 2 — FSAR SUBSECTION 2.5.1: BASIC GEOLOGIC AND SEISMIC INFORMATION TABLE OF CONTENTS 2.5.1 BASIC GEOLOGIC AND SEISMIC INFORMATION .............................2.5.1-1 ...
... COL Application Part 2 — FSAR SUBSECTION 2.5.1: BASIC GEOLOGIC AND SEISMIC INFORMATION TABLE OF CONTENTS 2.5.1 BASIC GEOLOGIC AND SEISMIC INFORMATION .............................2.5.1-1 ...
Evolution of the middle and lower crust during the transition from
... by these authors indicate isobaric lower crustal cooling through the range 650–550 °C by 113.5–111 Ma (Table 1). A possible resolution to these conflicting observations was presented by Klepeis et al. (2007) who suggested that the initiation of extension coincided with areas of the lower crust that ...
... by these authors indicate isobaric lower crustal cooling through the range 650–550 °C by 113.5–111 Ma (Table 1). A possible resolution to these conflicting observations was presented by Klepeis et al. (2007) who suggested that the initiation of extension coincided with areas of the lower crust that ...
The Eastern Offshore Extension into the Western Mediterranean of
... Menor margin and the adjacent coast. Our data images second order tectonic features (neo-tectonic features) superimposed on the larger structures. These include the deformation of the strata in the Algero-Balearic basin by the gliding of the Plio1 ...
... Menor margin and the adjacent coast. Our data images second order tectonic features (neo-tectonic features) superimposed on the larger structures. These include the deformation of the strata in the Algero-Balearic basin by the gliding of the Plio1 ...
Geodynamics of the Yellowstone hotspot and mantle plume: Seismic
... Integration of geophysical and geological data show that the Yellowstone hotspot resulted from a mantle plume interacting with the overriding North America plate, a process that has highly modified continental lithosphere by magmatic and tectonic processes and produced the 16-17 Ma, 700-km-long Yello ...
... Integration of geophysical and geological data show that the Yellowstone hotspot resulted from a mantle plume interacting with the overriding North America plate, a process that has highly modified continental lithosphere by magmatic and tectonic processes and produced the 16-17 Ma, 700-km-long Yello ...
On subducting slab entrainment of buoyant asthenosphere
... with deeper mantle flow. (b) Cartoon illustrating the possible connection between plate motions and deeper flow when a buoyant low-viscosity asthenosphere decoupling zone is present. (c) A snapshot after 7 Ma from a numerical experiment discussed in the text that shows the behaviour illustrated in (b) ...
... with deeper mantle flow. (b) Cartoon illustrating the possible connection between plate motions and deeper flow when a buoyant low-viscosity asthenosphere decoupling zone is present. (c) A snapshot after 7 Ma from a numerical experiment discussed in the text that shows the behaviour illustrated in (b) ...
as a PDF
... Abstract: We present an updated synthesis of the widely accepted ‘single-arc Pacific-origin’ and ‘Yucatán-rotation’ models for Caribbean and Gulf of Mexico evolution, respectively. Fourteen palaeogeographic maps through time integrate new concepts and alterations to earlier models. Pre-Aptian maps ...
... Abstract: We present an updated synthesis of the widely accepted ‘single-arc Pacific-origin’ and ‘Yucatán-rotation’ models for Caribbean and Gulf of Mexico evolution, respectively. Fourteen palaeogeographic maps through time integrate new concepts and alterations to earlier models. Pre-Aptian maps ...
Thinning of continental backarc lithosphere by flow
... flow laws to nature is subject to considerable uncertainty, primarily due to variability in composition and volatile content of natural rocks and uncertainties in the extrapolation of laboratory data to geological conditions. Given these uncertainties, the models are based on a reference set of flow l ...
... flow laws to nature is subject to considerable uncertainty, primarily due to variability in composition and volatile content of natural rocks and uncertainties in the extrapolation of laboratory data to geological conditions. Given these uncertainties, the models are based on a reference set of flow l ...
Journal of Volcanology and Geothermal Research
... Integration of geophysical and geological data show that the Yellowstone hotspot resulted from a mantle plume interacting with the overriding North America plate, a process that has highly modified continental lithosphere by magmatic and tectonic processes and produced the 16-17 Ma, 700-km-long Yello ...
... Integration of geophysical and geological data show that the Yellowstone hotspot resulted from a mantle plume interacting with the overriding North America plate, a process that has highly modified continental lithosphere by magmatic and tectonic processes and produced the 16-17 Ma, 700-km-long Yello ...
Thesis pdf
... of the deformation related to the Arabia and India convergence against Eurasia. By combining geophysical and petrological information, the crust and upper mantle of the Zagros and the Himalaya-Tibetan orogens have been characterized from the thermal, compositional and seismological point of view. Fo ...
... of the deformation related to the Arabia and India convergence against Eurasia. By combining geophysical and petrological information, the crust and upper mantle of the Zagros and the Himalaya-Tibetan orogens have been characterized from the thermal, compositional and seismological point of view. Fo ...
Precipitation of rutile and ilmenite needles in garnet
... elongation direction was verified by the AEM measurements of Hwang et al. (2007). Several other morphologies besides needles can be present. For example, submicrometer- to micrometer-scale plates of rutile, which are commonly twinned, are found in some garnets (Fig. 4). These are morphologically sim ...
... elongation direction was verified by the AEM measurements of Hwang et al. (2007). Several other morphologies besides needles can be present. For example, submicrometer- to micrometer-scale plates of rutile, which are commonly twinned, are found in some garnets (Fig. 4). These are morphologically sim ...
Neotectonic and Paleoseismic Onshore-Offshore integrated study of the Carboneras Fault (Eastern
... displacements at La Serrata. These vertical displacements are the result of compressive structures associated with strike-slip faults such as flower structures or restraining stepovers (Sylvester, 1988). The fault bounding La Serrata to the NW shows a discontinuous pressure-ridge where Pliocene rock ...
... displacements at La Serrata. These vertical displacements are the result of compressive structures associated with strike-slip faults such as flower structures or restraining stepovers (Sylvester, 1988). The fault bounding La Serrata to the NW shows a discontinuous pressure-ridge where Pliocene rock ...
Mechanisms of continental subduction and exhumation of HP and
... contexts, as well as that long-lasting (>10 Myr) continental subduction can only occur in case of cold strong lithospheres (TMoho b 550 °C, the equivalent elastic thickness Te >50 km) and of relatively high convergence rates (>3–5 cm yr−1 ). In this case, high density UHP material in the crustal par ...
... contexts, as well as that long-lasting (>10 Myr) continental subduction can only occur in case of cold strong lithospheres (TMoho b 550 °C, the equivalent elastic thickness Te >50 km) and of relatively high convergence rates (>3–5 cm yr−1 ). In this case, high density UHP material in the crustal par ...
Craton stability and longevity
... All models have a buoyant crust composed of 18 km upper crust and18 km lower crust, which are 600kg/m3 and 400kg/m3 less dense than the normal mantle, respectively. However, we found that, the effect of this crust density contrast on the dynamics of the convection system is minor. We ignore the diff ...
... All models have a buoyant crust composed of 18 km upper crust and18 km lower crust, which are 600kg/m3 and 400kg/m3 less dense than the normal mantle, respectively. However, we found that, the effect of this crust density contrast on the dynamics of the convection system is minor. We ignore the diff ...
Hawaii, Boundary Layers and Ambient
... temperature gradient. This is the shear, and thermal, BL of the upper mantle. It is usually referred to as the ‘asthenosphere’and erroneously thought of as simply part of the well-mixed ‘convecting mantle’. Because it supports both a shear and a thermal gradient, the lower portions are hot and move ...
... temperature gradient. This is the shear, and thermal, BL of the upper mantle. It is usually referred to as the ‘asthenosphere’and erroneously thought of as simply part of the well-mixed ‘convecting mantle’. Because it supports both a shear and a thermal gradient, the lower portions are hot and move ...
Geology
Geology (from the Greek γῆ, gē, i.e. ""earth"" and -λoγία, -logia, i.e. ""study of, discourse"") is an earth science comprising the study of solid Earth, the rocks of which it is composed, and the processes by which they change. Geology can also refer generally to the study of the solid features of any celestial body (such as the geology of the Moon or Mars).Geology gives insight into the history of the Earth by providing the primary evidence for plate tectonics, the evolutionary history of life, and past climates. Geology is important for mineral and hydrocarbon exploration and exploitation, evaluating water resources, understanding of natural hazards, the remediation of environmental problems, and for providing insights into past climate change. Geology also plays a role in geotechnical engineering and is a major academic discipline.