The Guerrero Composite Terrane of western Mexico
... The Guerrero Composite Terrane of western Mexico is the second largest terrane in North America. Mostly characterized by submarine volcanism and formed by five terranes, the Guerrero records vast and complex subduction-related processes influenced by major translation and rifting. It is composed of ...
... The Guerrero Composite Terrane of western Mexico is the second largest terrane in North America. Mostly characterized by submarine volcanism and formed by five terranes, the Guerrero records vast and complex subduction-related processes influenced by major translation and rifting. It is composed of ...
Sublayer and Offset Dikes of the Sudbury Igneous
... concentrations of detrital U- and Th-rich minerals. The U-mineralisation reaches its maximum development 100 km to the west of Sudbury in the Elliot Lake mining camp. Geological rock units related to Sudbury event include: (1) Sudbury Breccia; this is a breccia composed of fragments of country rock ...
... concentrations of detrital U- and Th-rich minerals. The U-mineralisation reaches its maximum development 100 km to the west of Sudbury in the Elliot Lake mining camp. Geological rock units related to Sudbury event include: (1) Sudbury Breccia; this is a breccia composed of fragments of country rock ...
Seismic refraction evidence for steep faults cutting highly
... Rumelhart 1999). The pre-Cenozoic basement rocks of the region record the subduction of the Farallon Plate along an Andean-type arc–trench system that can be traced continuously from the northern Sierra Nevada to the central Baja California regions (Crouch & Suppe 1993; Saleeby 2003). Late Cretaceou ...
... Rumelhart 1999). The pre-Cenozoic basement rocks of the region record the subduction of the Farallon Plate along an Andean-type arc–trench system that can be traced continuously from the northern Sierra Nevada to the central Baja California regions (Crouch & Suppe 1993; Saleeby 2003). Late Cretaceou ...
Bulletin of the Geological Society of Denmark, Vol. 29/1-2, pp. 77-101
... molasse sedimentation and Mesozoic rifting, and a southern area which apparently formed a cratonic block from the Early Proterozoic to the Middle Cretaceous. The whole margin was finally separated from the NW Eiu'opean margin by sea floor spreading in the latest Paleocene to earliest Eocene and now ...
... molasse sedimentation and Mesozoic rifting, and a southern area which apparently formed a cratonic block from the Early Proterozoic to the Middle Cretaceous. The whole margin was finally separated from the NW Eiu'opean margin by sea floor spreading in the latest Paleocene to earliest Eocene and now ...
Shock metamorphism of siliceous volcanic rocks of the El`gygytgyn
... (PFs) and planar deformation features (PDFs) in quartz by universal stage analysis. Additional PDF orientation measurements (on sample E963-12) were performed in Vienna in 2003. The presence of high-pressure polymorphs of silica was determined by X-ray diffractometry on insoluble fractions of shocke ...
... (PFs) and planar deformation features (PDFs) in quartz by universal stage analysis. Additional PDF orientation measurements (on sample E963-12) were performed in Vienna in 2003. The presence of high-pressure polymorphs of silica was determined by X-ray diffractometry on insoluble fractions of shocke ...
The three-dimensional thermo-mechanical signature of
... Farther inboard, broad uplift above subducting spreading ridges has been recognized in Central America (e.g., Rogers et al., 2002) and above regions of lithosphere break-off in the Carpathian region (e.g., Wortel and Spakman, 2000) where asthenospheric mantle replaces lithospheric mantle. The replac ...
... Farther inboard, broad uplift above subducting spreading ridges has been recognized in Central America (e.g., Rogers et al., 2002) and above regions of lithosphere break-off in the Carpathian region (e.g., Wortel and Spakman, 2000) where asthenospheric mantle replaces lithospheric mantle. The replac ...
Magmatic growth and batholithic root development in the northern
... north (Ague and Brimhall, 1988; Pickett and Saleeby, 1993; Ague, 1997; Nadin and Saleeby, 2008); (4) the basement into which the batholith is built changes from mainly late Proterozoic continental and transitional lithosphere in the south to a tapestry of accreted Phanerozoic belts in the north (Kis ...
... north (Ague and Brimhall, 1988; Pickett and Saleeby, 1993; Ague, 1997; Nadin and Saleeby, 2008); (4) the basement into which the batholith is built changes from mainly late Proterozoic continental and transitional lithosphere in the south to a tapestry of accreted Phanerozoic belts in the north (Kis ...
THE TECTONIC RELATIONSHIPS OF THE HILLABEE CHLORITE
... Mountain Formation (Neathery, 1975). Bearce (1973b) subdivided the northern Talladega Group into three units: the Heflin Phyllite, the Abel Gap Formation, and the Chulafinnee Schist. Tull (1977) interpreted the Hollins Line fault as a major thrust fault and included the Hillabee within the Talladeg ...
... Mountain Formation (Neathery, 1975). Bearce (1973b) subdivided the northern Talladega Group into three units: the Heflin Phyllite, the Abel Gap Formation, and the Chulafinnee Schist. Tull (1977) interpreted the Hollins Line fault as a major thrust fault and included the Hillabee within the Talladeg ...
Intrinsic versus extrinsic seismic anisotropy: The radial anisotropy in
... layering can be considered in the crust or shallow layers of ...
... layering can be considered in the crust or shallow layers of ...
Geological framework and mineralization of Papua New Guinea
... geochronological and isotopic data, and to the scarcity of well-constrained paleomagnetic data, for many rock units. In addition, there is great uncertainty about the age and kinematics of many of the major structures, and it is commonly not clear as to which deformation and regional metamorphic eve ...
... geochronological and isotopic data, and to the scarcity of well-constrained paleomagnetic data, for many rock units. In addition, there is great uncertainty about the age and kinematics of many of the major structures, and it is commonly not clear as to which deformation and regional metamorphic eve ...
garwin_et_al_2005 Au-Cu Cenozoic magmatic arcs SE Asia
... Mineral deposit styles: More than 40 low-sulfidation epithermal gold and mercury deposits and prospects are distributed in northeast Hokkaido at the southwestern Kuril arc (Fig. 11, App. 2). They are associated mainly with rhyolitic ...
... Mineral deposit styles: More than 40 low-sulfidation epithermal gold and mercury deposits and prospects are distributed in northeast Hokkaido at the southwestern Kuril arc (Fig. 11, App. 2). They are associated mainly with rhyolitic ...
a comparison of the krušné hory-erzgebirge
... Štemprok, M. 1995. A comparison of the Krušné hory-Erzgebirge (Czech Republic - Germany) and Cornish (UK) granites and their related mineralisation. Proceedings of the Ussher Society 8, 347-356 The mining regions of the Krušné hory-Erzgebirge (Czech Republic - Germany) and of SW England (UK) are com ...
... Štemprok, M. 1995. A comparison of the Krušné hory-Erzgebirge (Czech Republic - Germany) and Cornish (UK) granites and their related mineralisation. Proceedings of the Ussher Society 8, 347-356 The mining regions of the Krušné hory-Erzgebirge (Czech Republic - Germany) and of SW England (UK) are com ...
Chapter 21: Metamorphism
... “Metamorphism is a subsolidus process leading to changes in mineralogy and/or texture (for example grain size) and often in chemical composition in a rock. These changes are due to physical and/or chemical conditions that differ from those normally occurring at the surface of planets and in zones of ...
... “Metamorphism is a subsolidus process leading to changes in mineralogy and/or texture (for example grain size) and often in chemical composition in a rock. These changes are due to physical and/or chemical conditions that differ from those normally occurring at the surface of planets and in zones of ...
Introduction to Metamorphism
... “Metamorphism is a subsolidus process leading to changes in mineralogy and/or texture (for example grain size) and often in chemical composition in a rock. These changes are due to physical and/or chemical conditions that differ from those normally occurring at the surface of planets and in zones of ...
... “Metamorphism is a subsolidus process leading to changes in mineralogy and/or texture (for example grain size) and often in chemical composition in a rock. These changes are due to physical and/or chemical conditions that differ from those normally occurring at the surface of planets and in zones of ...
Tectonic re-interpretation of the Banggai
... Abstract: High resolution multibeam bathymetric and seismic data from the area north of the Banggai-Sula Islands, Indonesia, provide a new insight into the geological history of the boundary between the East Sulawesi ophiolite, the Banggai-Sula microcontinent and the Molucca Sea collision zone. Majo ...
... Abstract: High resolution multibeam bathymetric and seismic data from the area north of the Banggai-Sula Islands, Indonesia, provide a new insight into the geological history of the boundary between the East Sulawesi ophiolite, the Banggai-Sula microcontinent and the Molucca Sea collision zone. Majo ...
An integrated geophysical analysis of the upper crust of the southern
... maxima. He also showed that a minor densification of the basement by dyke injection could explain much of the axial high. The KRISP 90 and 94 results were not available at the time he did his analysis, and he did not have access to the new gravity data and drill hole information presented here. Howe ...
... maxima. He also showed that a minor densification of the basement by dyke injection could explain much of the axial high. The KRISP 90 and 94 results were not available at the time he did his analysis, and he did not have access to the new gravity data and drill hole information presented here. Howe ...
High-Sr Volcanic Domes from the Lassen
... garnet in the melting assemblage. Partial melting is consistent with published thermal calculations that demonstrate emplaced basaltic magmas in the lower continental crust as the heat source to induce melting. Although some geochemical characteristics of the Onion Butte dacites (high Sr, high Sr ...
... garnet in the melting assemblage. Partial melting is consistent with published thermal calculations that demonstrate emplaced basaltic magmas in the lower continental crust as the heat source to induce melting. Although some geochemical characteristics of the Onion Butte dacites (high Sr, high Sr ...
Batholith tectonics: Formation and deformation of ghost stratigraphy
... demonstrate that mapped intrusion geometries may be the result of multiple events of magma emplacement, crystallization, and solidification, even where contacts between two units are gradational or not observed (e.g., Memeti et al., 2010). If a single mapped intrusion is constructed by multiple batc ...
... demonstrate that mapped intrusion geometries may be the result of multiple events of magma emplacement, crystallization, and solidification, even where contacts between two units are gradational or not observed (e.g., Memeti et al., 2010). If a single mapped intrusion is constructed by multiple batc ...
Open-system Behavior during Pluton^Wall
... has broad implications. Generation of new continental crust often involves the interaction of juvenile magmas with pre-existing lithosphere, such as in continental arcs. In addition, interaction with volatile-bearing countryrocks, such as carbonate-bearing sediments, could lead to extensive devolati ...
... has broad implications. Generation of new continental crust often involves the interaction of juvenile magmas with pre-existing lithosphere, such as in continental arcs. In addition, interaction with volatile-bearing countryrocks, such as carbonate-bearing sediments, could lead to extensive devolati ...
Townend, J., Sutherland, R. and Toy, V., 2009. Deep Fault Drilling
... a globally significant natural laboratory for research into how active plate-bounding continental faults work and, in particular, how rocks exposed at the surface today relate to deep-seated processes of tectonic deformation, seismogenesis, and mineralization. The along-strike homogeneity of the han ...
... a globally significant natural laboratory for research into how active plate-bounding continental faults work and, in particular, how rocks exposed at the surface today relate to deep-seated processes of tectonic deformation, seismogenesis, and mineralization. The along-strike homogeneity of the han ...
Provenance characteristics of the Brumunddal sandstone in the Oslo
... Sample preparation was done at the Department of Geosciences, University of Oslo, and analysis of zircon by LAM-ICPMS at the GEMOC National Key Centre, Macquarie University and at the Department of Geosciences, University of Oslo. Zircon grains were separated from rock samples by standard crushing a ...
... Sample preparation was done at the Department of Geosciences, University of Oslo, and analysis of zircon by LAM-ICPMS at the GEMOC National Key Centre, Macquarie University and at the Department of Geosciences, University of Oslo. Zircon grains were separated from rock samples by standard crushing a ...
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.