Summary of Northeast Asia geodynamics and tectonics*
... Fragment of part or all of a suite of deep-marine sedimentary rocks, pillow basalt, gabbro, and ultramafic rocks (former eugeoclinal eugeoclinal suite) that are interpreted as oceanic sedimentary and volcanic rocks and the upper mantle. Includes both inferred offshore oceanic and marginal ocean basi ...
... Fragment of part or all of a suite of deep-marine sedimentary rocks, pillow basalt, gabbro, and ultramafic rocks (former eugeoclinal eugeoclinal suite) that are interpreted as oceanic sedimentary and volcanic rocks and the upper mantle. Includes both inferred offshore oceanic and marginal ocean basi ...
Document
... identified. The margins of the Tyrone Igneous Complex and the internal structure of the complex itself are revealed in stunning detail and many new faults and sheared rocks identified. Within the adjacent Dalradian rocks arcuate linear magnetic anomalies related to fold structures and several import ...
... identified. The margins of the Tyrone Igneous Complex and the internal structure of the complex itself are revealed in stunning detail and many new faults and sheared rocks identified. Within the adjacent Dalradian rocks arcuate linear magnetic anomalies related to fold structures and several import ...
Geology and Resources of Fluorine in the United States
... APPRAISAL OF MINERAL RESOURCES Continuing appraisal of the mineral resources of the United States is conducted by the U.S. Geological Survey in accordance with the provisions of the Mining and Minerals Policy Act of 1970 (Public Law 91-631, Dec. 31, 1970). Total resources for purposes of these appr ...
... APPRAISAL OF MINERAL RESOURCES Continuing appraisal of the mineral resources of the United States is conducted by the U.S. Geological Survey in accordance with the provisions of the Mining and Minerals Policy Act of 1970 (Public Law 91-631, Dec. 31, 1970). Total resources for purposes of these appr ...
Normal faulting in the upper plate of a metamorphic core complex
... 1985). Two major extensional events in this region are recorded in the uplift and cooling history of footwall rocks in the northern and southern Snake Ranges, and can be separated from each other based on geologic relations, using 40Ar/39Ar dating techniques and fission track analyses of apatites an ...
... 1985). Two major extensional events in this region are recorded in the uplift and cooling history of footwall rocks in the northern and southern Snake Ranges, and can be separated from each other based on geologic relations, using 40Ar/39Ar dating techniques and fission track analyses of apatites an ...
Three‐dimensional field perspective on deformation, flow, and
... framework of weak lithosphere, the interplay of deformation and mass transfer accompanying juvenile magmatic accretion in the lower crust is key to the understanding of continental growth and differentiation. [3] Several studies have addressed the pluton space problem in the midcrust and upper crust ...
... framework of weak lithosphere, the interplay of deformation and mass transfer accompanying juvenile magmatic accretion in the lower crust is key to the understanding of continental growth and differentiation. [3] Several studies have addressed the pluton space problem in the midcrust and upper crust ...
Report of Investigation 195
... The present work summarizes the results of the project “3D/4D modeling – Outokumpu area as a case study” conducted during 2007–2009 and 3D modeling of the Outokumpu assemblage in the project “Development of geological 3D modeling using structural geology and geostatistics” in 2010 at the Geological ...
... The present work summarizes the results of the project “3D/4D modeling – Outokumpu area as a case study” conducted during 2007–2009 and 3D modeling of the Outokumpu assemblage in the project “Development of geological 3D modeling using structural geology and geostatistics” in 2010 at the Geological ...
IODP Proposal Cover Sheet
... The IBM subduction zone began as part of a hemispheric-scale foundering of old, dense lithosphere in the Western Pacific about 50 Ma (Bloomer et al., 1995; Cosca et al., 1998; Stern, 2004), perhaps aided by reorganization of plate boundaries throughout the western Pacific (Okino et al., 2004; Hall e ...
... The IBM subduction zone began as part of a hemispheric-scale foundering of old, dense lithosphere in the Western Pacific about 50 Ma (Bloomer et al., 1995; Cosca et al., 1998; Stern, 2004), perhaps aided by reorganization of plate boundaries throughout the western Pacific (Okino et al., 2004; Hall e ...
Seismic refraction evidence for steep faults cutting highly
... the Los Angeles Region Seismic Experiment phase II (LARSE II) seismic refraction data recorded over the north central Transverse ranges and adjacent Mojave desert in southern California. The profile extends to a depth of approximately 4 km. The faults were identified from distinctive features in the ...
... the Los Angeles Region Seismic Experiment phase II (LARSE II) seismic refraction data recorded over the north central Transverse ranges and adjacent Mojave desert in southern California. The profile extends to a depth of approximately 4 km. The faults were identified from distinctive features in the ...
Tourmaline Isotopes: No Element Left Behind
... these rocks does not significantly fractionate B isotopes, as demonstrated by Kasemann et al. (2000). These authors also showed that tourmaline from metamorphic rocks and granites in the same crustal section have overlapping B isotope compositions, consistent with their estimate for the average cont ...
... these rocks does not significantly fractionate B isotopes, as demonstrated by Kasemann et al. (2000). These authors also showed that tourmaline from metamorphic rocks and granites in the same crustal section have overlapping B isotope compositions, consistent with their estimate for the average cont ...
Paleozoic–Mesozoic Porphyry Cu(Mo) and Mo(Cu) Deposits within
... The porphyritic Mo(Cu) mineralization within the Mesozoic magmatic belt is concentrated in two terranes separated by the Mongol–Okhotsk suture. The belt originated when the Mongol–Okhotsk Oceanic plate was subducted beneath the Siberian continent (north of the Mongol–Okhotsk suture) and the Mongolia ...
... The porphyritic Mo(Cu) mineralization within the Mesozoic magmatic belt is concentrated in two terranes separated by the Mongol–Okhotsk suture. The belt originated when the Mongol–Okhotsk Oceanic plate was subducted beneath the Siberian continent (north of the Mongol–Okhotsk suture) and the Mongolia ...
A review of the isotopic and trace element evidence for
... The surface of Earth is composed of geodynamically stable continental cratons, orogenically active continental and oceanic margins, and freshly created ocean floor that compositionally reflects 4.5 billion years of geological evolution. While present plate tectonic processes (summed up as the “Wilso ...
... The surface of Earth is composed of geodynamically stable continental cratons, orogenically active continental and oceanic margins, and freshly created ocean floor that compositionally reflects 4.5 billion years of geological evolution. While present plate tectonic processes (summed up as the “Wilso ...
39. crustal structure along the leg 152 drilling transect
... (IGR), the extrusive part of the new igneous (oceanic) crust onlaps the Precambrian crust. The subaerially erupted lavas, which are in places at least 5 km thick, are widely distributed over both continental crust, where they form plateau basalts, and within the oldest oceanic crust seaward of the c ...
... (IGR), the extrusive part of the new igneous (oceanic) crust onlaps the Precambrian crust. The subaerially erupted lavas, which are in places at least 5 km thick, are widely distributed over both continental crust, where they form plateau basalts, and within the oldest oceanic crust seaward of the c ...
Tectonic Setting and Regional Geology of the KSZ
... This study integrates petrological, structural, geochemical, geochronological and isotopic investigations of the geodynamic evolution of the Neoproterozoic Keraf Shear Zone (KSZ) in NE Sudan. It is a ~500 km long, thrust-bounded and wedge-shaped belt, that is narrower (∼30 km) in the S and wider (∼1 ...
... This study integrates petrological, structural, geochemical, geochronological and isotopic investigations of the geodynamic evolution of the Neoproterozoic Keraf Shear Zone (KSZ) in NE Sudan. It is a ~500 km long, thrust-bounded and wedge-shaped belt, that is narrower (∼30 km) in the S and wider (∼1 ...
Scandium mineralizations in southern Norway
... the Svecofennian (ca. 1,600-1,700 Ma) and Sveconorwegian (ca. 1,000-1,200 Ma) periods. The gneisses in this region form a series of NNW-SSE striking provinces, cut by the overall N-S trend of the Carbo-Permian (ca. 300-230 Ma) Oslo Rift and graben. The rocks have been extensively eroded by glaciers ...
... the Svecofennian (ca. 1,600-1,700 Ma) and Sveconorwegian (ca. 1,000-1,200 Ma) periods. The gneisses in this region form a series of NNW-SSE striking provinces, cut by the overall N-S trend of the Carbo-Permian (ca. 300-230 Ma) Oslo Rift and graben. The rocks have been extensively eroded by glaciers ...
Geoscientific Report GR2011-1
... Figure 1: Regional geology map of part of the Reindeer Zone in the southern Trans-Hudson Orogen........................................... 1 Figure 2: Geology of the northern part of the western Flin Flon Belt, showing the main tectonostratigraphic components...........2 Figure 3: Structural geology ...
... Figure 1: Regional geology map of part of the Reindeer Zone in the southern Trans-Hudson Orogen........................................... 1 Figure 2: Geology of the northern part of the western Flin Flon Belt, showing the main tectonostratigraphic components...........2 Figure 3: Structural geology ...
Chapter 3 CHARACTERISTICS OF LEAD
... early Neoproterozoic-early Mesozoic multiperiodic orogenic system including Early Paleozoic intracontinental orogenic belts and Late Paleozoic-Cenozoic intracontinental basins with Late Paleozoic-Cenozoic intracontinental rift system and is divided into the major tectonic units: the early Paleozoic ...
... early Neoproterozoic-early Mesozoic multiperiodic orogenic system including Early Paleozoic intracontinental orogenic belts and Late Paleozoic-Cenozoic intracontinental basins with Late Paleozoic-Cenozoic intracontinental rift system and is divided into the major tectonic units: the early Paleozoic ...
Effects of mechanical layering on hydrofracture
... hydrofractures contribute little if anything to its overall vertical permeability. For such a reservoir, the permeability is necessarily dominated by fractures that propagate through many layers that is, non-stratabound fractures. In volcanic hazard studies the propagation of magma-driven fractures ...
... hydrofractures contribute little if anything to its overall vertical permeability. For such a reservoir, the permeability is necessarily dominated by fractures that propagate through many layers that is, non-stratabound fractures. In volcanic hazard studies the propagation of magma-driven fractures ...
Kurzlaukis and Lorenz_Gibeon Volcanic Field
... are also observed. These diapirs point inwards from the dike margins and suggest relatively slow cooling after emplacement of the dike. Most diatremes are located on and cut downwards into dikes and, therefore, the dikes in all probability represent the feeders for the diatremes. The diatremes are o ...
... are also observed. These diapirs point inwards from the dike margins and suggest relatively slow cooling after emplacement of the dike. Most diatremes are located on and cut downwards into dikes and, therefore, the dikes in all probability represent the feeders for the diatremes. The diatremes are o ...
Magmatic growth and batholithic root development in the northern
... The Sierra Nevada, one of the largest batholiths in North America, strikes NNW and can be traced ~600 km along the eastern spine of California, varying in width between ~80 and 120 km. The batholith comprises mainly subduction-related intermediate to felsic intrusive rocks and associated metamorphic ...
... The Sierra Nevada, one of the largest batholiths in North America, strikes NNW and can be traced ~600 km along the eastern spine of California, varying in width between ~80 and 120 km. The batholith comprises mainly subduction-related intermediate to felsic intrusive rocks and associated metamorphic ...
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 • Most orogenic belts have several episodes of deformation and 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 • Most orogenic belts have several episodes of deformation and metamorphism, ...
Introduction to 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 • Most orogenic belts have several episodes of deformation and 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 • Most orogenic belts have several episodes of deformation and metamorphism, ...
Saltpan impact crater, South Africa: Geochemistry of target rocks
... is a small crater which formed in crystalline rock, in contrast to some other crater of this size which formed in sedimentary targets. Since then BRANDTand REIMOLD(1993) and BRANDTet al. (1993a,b, 1994) presented more detailed geological and geophysical results. It was shown that the occurrence of v ...
... is a small crater which formed in crystalline rock, in contrast to some other crater of this size which formed in sedimentary targets. Since then BRANDTand REIMOLD(1993) and BRANDTet al. (1993a,b, 1994) presented more detailed geological and geophysical results. It was shown that the occurrence of v ...
Ophiolite concept and its evolution
... The ophiolite concept, first developed in Europe in the early nineteenth century, went through several phases of evolution. Early studies of ophiolites prior to the plate tectonic revolution emphasized the development of ophiolites as in situ intrusions within geosynclines. The genetic association o ...
... The ophiolite concept, first developed in Europe in the early nineteenth century, went through several phases of evolution. Early studies of ophiolites prior to the plate tectonic revolution emphasized the development of ophiolites as in situ intrusions within geosynclines. The genetic association o ...
CPC-2014 - TU Freiberg
... boundaries into the vast continental deposits on the CP Earth. However, the Late Carboniferous and Permian was a time of extreme continentality due to an exceptional low sea level. So, the huge landmass of Gondwana on its own covered an area of about 73 million km2 (what is more than seven-times the ...
... boundaries into the vast continental deposits on the CP Earth. However, the Late Carboniferous and Permian was a time of extreme continentality due to an exceptional low sea level. So, the huge landmass of Gondwana on its own covered an area of about 73 million km2 (what is more than seven-times the ...
Geology of Great Britain
The geology of Great Britain is renowned for its diversity. As a result of its eventful geological history, Great Britain shows a rich variety of landscapes across the constituent countries of England, Wales and Scotland. Rocks of almost all geological ages are represented at outcrop, from the Archaean onwards.