Analcime phenocrysts in igneous rocks: Primary or secondary
... are due to alteration of glass rather than alteration of analcime. Although the Crowsnest locality is noteworthy for its large fresh analcime crystals, such pristine analcime is actually rare within the formation. Most of the analcime is altered in some fashion. It might be stressedhere that the alt ...
... are due to alteration of glass rather than alteration of analcime. Although the Crowsnest locality is noteworthy for its large fresh analcime crystals, such pristine analcime is actually rare within the formation. Most of the analcime is altered in some fashion. It might be stressedhere that the alt ...
Geology and Geophysics (GEOS)
... structures including folds, faults and penetrative fabrics, and the associations of structures characteristic of different tectonic settings. Provides background in structural geology. Emphasis in the laboratory on examples and techniques that are broadly applicable in geology, especially the interp ...
... structures including folds, faults and penetrative fabrics, and the associations of structures characteristic of different tectonic settings. Provides background in structural geology. Emphasis in the laboratory on examples and techniques that are broadly applicable in geology, especially the interp ...
Petrology and Geochemistry of the Nipissing Gabbro
... Petrology and Geochemistry of the Nipissing gabbro: exploration strategies for nickel, copper, and platinum group elements in a large igneous province (Ontario Geological Survey report, ISSN 0704-2590; 58) Includes bibliographical references. ISBN 0-7778-4804-X 1. Gabbro---Ontario---Nipissing Region ...
... Petrology and Geochemistry of the Nipissing gabbro: exploration strategies for nickel, copper, and platinum group elements in a large igneous province (Ontario Geological Survey report, ISSN 0704-2590; 58) Includes bibliographical references. ISBN 0-7778-4804-X 1. Gabbro---Ontario---Nipissing Region ...
GEOLOGICAL SURVEY OF FINLAND Special Paper 48 2008 GTK
... The first paper provides a general introduction to the work carried out by the GTK Consortium within separate project components. These are described in more detail in the following papers, starting with data management and map production, followed by an article on the interpretation of remote sensin ...
... The first paper provides a general introduction to the work carried out by the GTK Consortium within separate project components. These are described in more detail in the following papers, starting with data management and map production, followed by an article on the interpretation of remote sensin ...
Rhenium^Osmium Isotope and Platinum-Group Element
... isotope systematics determined for the entire preserved stratigraphy of the 127 Ga Muskox intrusion provide an exceptional view of magma chamber processes and mineralization in the main plutonic system of the Mackenzie large igneous province (LIP). We present new Re^Os isotope data for the intrusio ...
... isotope systematics determined for the entire preserved stratigraphy of the 127 Ga Muskox intrusion provide an exceptional view of magma chamber processes and mineralization in the main plutonic system of the Mackenzie large igneous province (LIP). We present new Re^Os isotope data for the intrusio ...
Rhenium^Osmium Isotope and Platinum
... isotope systematics determined for the entire preserved stratigraphy of the 127 Ga Muskox intrusion provide an exceptional view of magma chamber processes and mineralization in the main plutonic system of the Mackenzie large igneous province (LIP). We present new Re^Os isotope data for the intrusio ...
... isotope systematics determined for the entire preserved stratigraphy of the 127 Ga Muskox intrusion provide an exceptional view of magma chamber processes and mineralization in the main plutonic system of the Mackenzie large igneous province (LIP). We present new Re^Os isotope data for the intrusio ...
Mantle Convection in the Earth and Planets - U
... convection is the primary mechanism for the transport of heat from the Earth’s deep interior to its surface, it is the underlying cause of plate tectonics, formation and drift of continents, volcanism, earthquakes, and mountain building processes. It also shapes the gravitational and magnetic fields ...
... convection is the primary mechanism for the transport of heat from the Earth’s deep interior to its surface, it is the underlying cause of plate tectonics, formation and drift of continents, volcanism, earthquakes, and mountain building processes. It also shapes the gravitational and magnetic fields ...
Mechanisms for folding of high-grade rocks in extensional tectonic
... This review of structures developed in extensional high-grade terrains, combined with results of centrifuge analogue modelling, illustrates the range of fold styles and mechanisms for folding of amphibolite to granulite facies rocks during rifting or the collapse of a thrust-thickened orogen. Severa ...
... This review of structures developed in extensional high-grade terrains, combined with results of centrifuge analogue modelling, illustrates the range of fold styles and mechanisms for folding of amphibolite to granulite facies rocks during rifting or the collapse of a thrust-thickened orogen. Severa ...
Differential preservation in the geologic record of intraoceanic arc
... to reconstruct paleogeography and plate motion, and to understand how continental crust is formed, recycled, and maintained through time. However, interpreting tectonic and sedimentary records from ancient terranes after arc–continent collision is complicated by preferential preservation of evidence ...
... to reconstruct paleogeography and plate motion, and to understand how continental crust is formed, recycled, and maintained through time. However, interpreting tectonic and sedimentary records from ancient terranes after arc–continent collision is complicated by preferential preservation of evidence ...
Fulltext - ETH E-Collection
... formed as a result of NE-dipping subduction of the Neotethys ocean beneath the European continental margin during the Late Cretaceous. This magmatic arc is associated with some of Europe’s largest porphyry Cu-Au and epithermal Cu-Au deposits. However, the ore deposits are not evenly distributed with ...
... formed as a result of NE-dipping subduction of the Neotethys ocean beneath the European continental margin during the Late Cretaceous. This magmatic arc is associated with some of Europe’s largest porphyry Cu-Au and epithermal Cu-Au deposits. However, the ore deposits are not evenly distributed with ...
Field Guide to the Punchbowl Fault Zone at Devil`s Punchbowl Los
... whereas outside the damage zone the preferred orientations are more variable (Fig. 6). In the damage zone and within 2.5 m of the fault surface (inner damage zone), microfractures display preferred orientations that are parallel and perpendicular to the fault surface. Between 2.5 and approximately 1 ...
... whereas outside the damage zone the preferred orientations are more variable (Fig. 6). In the damage zone and within 2.5 m of the fault surface (inner damage zone), microfractures display preferred orientations that are parallel and perpendicular to the fault surface. Between 2.5 and approximately 1 ...
PDF
... cone complex that was active between 2·76 and 1·34 Ma. Basalts were erupted at more than 14 centers scattered over a region 40 km in diameter. Alkali basalt was erupted first, followed by sub-alkaline basalt. Quasi-concentric expansion of eruption centers coinciding with uplift and with decreasing a ...
... cone complex that was active between 2·76 and 1·34 Ma. Basalts were erupted at more than 14 centers scattered over a region 40 km in diameter. Alkali basalt was erupted first, followed by sub-alkaline basalt. Quasi-concentric expansion of eruption centers coinciding with uplift and with decreasing a ...
Indian Ocean - BGR
... its activities and investments in the South African mining sector, the German Mineral Resources Agency (DERA), as an integral part of the BGR, has maintained a cooperation with South Africa since November 2011 in the area of mineral resources. DERA is currently Distribution of bituminous facies of t ...
... its activities and investments in the South African mining sector, the German Mineral Resources Agency (DERA), as an integral part of the BGR, has maintained a cooperation with South Africa since November 2011 in the area of mineral resources. DERA is currently Distribution of bituminous facies of t ...
Not Getting the Drift - Personal webpages at NTNU
... suppose an extreme result of geological change. But if we consider a mere approximation to such a state of things, it would be sufficient to cause a general elevation of temperature. Nor can it be regarded as a visionary idea, that, amidst the revolutions of the earth’s surface, the quantity of land ...
... suppose an extreme result of geological change. But if we consider a mere approximation to such a state of things, it would be sufficient to cause a general elevation of temperature. Nor can it be regarded as a visionary idea, that, amidst the revolutions of the earth’s surface, the quantity of land ...
Ophiolite concept and its evolution
... sciences. Ophiolite studies have brought together diverse groups of international scientists on a regular basis far more than any other topic in geology, and the questions and problems raised and resolved during the course of these studies have made significant contributions to the evolution of geol ...
... sciences. Ophiolite studies have brought together diverse groups of international scientists on a regular basis far more than any other topic in geology, and the questions and problems raised and resolved during the course of these studies have made significant contributions to the evolution of geol ...
A. M. Celâl ŞENGÖR, Boris A. NATAL`IN, Gürsel
... The Altaids are one of the largest superorogenic complexes in the world in which two genetically closely related orogenic complexes ended up generating much of northern Asia during the Palaeozoic and the early and medial Mesozoic. This immense superorogenic complex evolved as a consequence of the de ...
... The Altaids are one of the largest superorogenic complexes in the world in which two genetically closely related orogenic complexes ended up generating much of northern Asia during the Palaeozoic and the early and medial Mesozoic. This immense superorogenic complex evolved as a consequence of the de ...
Near-Ultrahigh Pressure Processing of Continental Crust: Miocene
... Only xenoliths erupted from ultrahigh-pressure settings can provide this important information, but such rocks are exceptionally rare. We report here on the petrology, physical properties, and geochronology of a Miocene xenolith suite from the Pamir that has captured nearultrahigh pressure metamorph ...
... Only xenoliths erupted from ultrahigh-pressure settings can provide this important information, but such rocks are exceptionally rare. We report here on the petrology, physical properties, and geochronology of a Miocene xenolith suite from the Pamir that has captured nearultrahigh pressure metamorph ...
H2O subduction beyond arcs
... the phase relations of the relevant rock types, and then use those phase diagrams in conjunction with subduction zone parameters to calculate postarc slab H2O flux. ...
... the phase relations of the relevant rock types, and then use those phase diagrams in conjunction with subduction zone parameters to calculate postarc slab H2O flux. ...
Sabzevar Ophiolite, NE Iran - The University of Texas at Dallas
... We suggest that the Sabzevar ophiolites formed in an embryonic oceanic arc basin between the Lut Block to the south and east and the Binalud mountains (Turan block) to the north, and that this small oceanic arc basin existed from at least mid-Cretaceous times. Intraoceanic subduction began before th ...
... We suggest that the Sabzevar ophiolites formed in an embryonic oceanic arc basin between the Lut Block to the south and east and the Binalud mountains (Turan block) to the north, and that this small oceanic arc basin existed from at least mid-Cretaceous times. Intraoceanic subduction began before th ...
- CSUN ScholarWorks - California State University
... during deformation, that are experimentally determined in the laboratory for single phase or polyphase aggregates designed to imitate the composition of continental crust. However, it remains a subject of debate whether or not flow laws accurately describe the behavior of naturally-deformed contine ...
... during deformation, that are experimentally determined in the laboratory for single phase or polyphase aggregates designed to imitate the composition of continental crust. However, it remains a subject of debate whether or not flow laws accurately describe the behavior of naturally-deformed contine ...
res terrae - Oulun yliopisto
... This thesis comprises six original papers that focus on the sedimentology of the Mesoproterozoic (1.6–1.0 Ga) Telemark basin-fills in southern Norway, known as the Telemark supracrustal rocks. It is made up of an approximately 10-km-thick succession of volcanic-sedimentary rocks that are an integral ...
... This thesis comprises six original papers that focus on the sedimentology of the Mesoproterozoic (1.6–1.0 Ga) Telemark basin-fills in southern Norway, known as the Telemark supracrustal rocks. It is made up of an approximately 10-km-thick succession of volcanic-sedimentary rocks that are an integral ...
EVOLUTION OF THE NORTH AMERICAN CORDILLERA William R
... flexure from sediment loading of oceanic crust offshore (Fedo & Cooper 2001). The evidence for two rift events (Colpron et al. 2002), spaced 160–170 million years apart in pre-Windermere and latest Neoproterozoic time, suggests the possibility that two different continental blocks, one west of Canad ...
... flexure from sediment loading of oceanic crust offshore (Fedo & Cooper 2001). The evidence for two rift events (Colpron et al. 2002), spaced 160–170 million years apart in pre-Windermere and latest Neoproterozoic time, suggests the possibility that two different continental blocks, one west of Canad ...
evolution of the north american cordillera
... flexure from sediment loading of oceanic crust offshore (Fedo & Cooper 2001). The evidence for two rift events (Colpron et al. 2002), spaced 160–170 million years apart in pre-Windermere and latest Neoproterozoic time, suggests the possibility that two different continental blocks, one west of Canad ...
... flexure from sediment loading of oceanic crust offshore (Fedo & Cooper 2001). The evidence for two rift events (Colpron et al. 2002), spaced 160–170 million years apart in pre-Windermere and latest Neoproterozoic time, suggests the possibility that two different continental blocks, one west of Canad ...
Evolution of the Paleo-Asian Ocean (Altai−Sayan Region, Central
... mosaic pattern, and is separated by island arcs and accretionary zones (Fig. 1). The mosaic pattern resulted from the oblique subduction and its related large-scale horizontal displacements along the continental margin (Berzin and Dobretsov, 1994; Berzin et al., 1994; Dobretsov et al., 1995). A simi ...
... mosaic pattern, and is separated by island arcs and accretionary zones (Fig. 1). The mosaic pattern resulted from the oblique subduction and its related large-scale horizontal displacements along the continental margin (Berzin and Dobretsov, 1994; Berzin et al., 1994; Dobretsov et al., 1995). A simi ...
Earthscope
Earthscope is an earth science program using geological and geophysical techniques to explore the structure and evolution of the North American continent and to understand the processes controlling earthquakes and volcanoes. The project has three components: USARRAY, the Plate Boundary Observatory, and the San Andreas Fault Observatory at Depth.The project is funded by the National Science Foundation (NSF), and the data produced is publicly accessible in real-time. Organizations associated with the project include UNAVCO, the Incorporated Research Institutions for Seismology (IRIS), Stanford University, the United States Geological Survey (USGS) and National Aeronautics and Space Administration (NASA). Several international organizations also contribute to the initiative.