Crustal radial anisotropy across Eastern Tibet and the Western
... [6] Shapiro et al. [2004] showed that crustal radial anisotropy is strong in western Tibet and may extend into eastern Tibet where the resolution of their study was weaker. Subsequently, Duret et al. [2010] presented evidence from individual seismograms using aftershocks of the Wenchuan earthquake o ...
... [6] Shapiro et al. [2004] showed that crustal radial anisotropy is strong in western Tibet and may extend into eastern Tibet where the resolution of their study was weaker. Subsequently, Duret et al. [2010] presented evidence from individual seismograms using aftershocks of the Wenchuan earthquake o ...
No. 51. The Sveconorwegian Orogen of southern Scandinavia
... geology, metamorphic petrology and different applications of geochronological-geochemical analytical techniques to constrain the timing and character of metamorphic and tectonothermal events in high-grade metamorphic complexes. The individual excursion stops have been selected to include key localit ...
... geology, metamorphic petrology and different applications of geochronological-geochemical analytical techniques to constrain the timing and character of metamorphic and tectonothermal events in high-grade metamorphic complexes. The individual excursion stops have been selected to include key localit ...
The West Andean Thrust (WAT), the San Ramón Fault and the
... the western foreland of the Andes (the Marginal or Coastal Block). East of the Marginal Block, a large region with elevation over 1 km associated with the Andes extends at this latitude over a total width of ~200 km. However, the Andes mountain belt strictly, with elevation >2 km, is restricted to a ...
... the western foreland of the Andes (the Marginal or Coastal Block). East of the Marginal Block, a large region with elevation over 1 km associated with the Andes extends at this latitude over a total width of ~200 km. However, the Andes mountain belt strictly, with elevation >2 km, is restricted to a ...
Plate Tectonic Evolution and Mineral Resource
... Tethys and collided with Eurasia, has not been satisfactorily answered. In this debate, the Lancang River Zone (Lancangjiang) is believed to hold a key position in tracing the major divide between Gondwana and Eurasia and has been the subject of a range of interpretations since the early 1980’s. Thi ...
... Tethys and collided with Eurasia, has not been satisfactorily answered. In this debate, the Lancang River Zone (Lancangjiang) is believed to hold a key position in tracing the major divide between Gondwana and Eurasia and has been the subject of a range of interpretations since the early 1980’s. Thi ...
A Geochemical Study of Crustal Plutonic Rocks from the Southern
... I would like to express my heartfelt thanks to my advisor and mentor, Dr. Rosemary Hickey-Vargas, who guided, motivated, and inspired me all these years; my committee members for their revisions, suggestions and tolerance of my penchant for waiting until the eleventh hour; the NSF grant that funded ...
... I would like to express my heartfelt thanks to my advisor and mentor, Dr. Rosemary Hickey-Vargas, who guided, motivated, and inspired me all these years; my committee members for their revisions, suggestions and tolerance of my penchant for waiting until the eleventh hour; the NSF grant that funded ...
Abyssal peridotites, very slow spreading ridges and
... almost entirely removed. At the same time, the spatially associated basalts have a large range of compositions, similar to those from the rift valleys, requiring extensive shallowlevel fractional crystallization. Since there is little evidence for magma chambers at these fracture zones, it is conclu ...
... almost entirely removed. At the same time, the spatially associated basalts have a large range of compositions, similar to those from the rift valleys, requiring extensive shallowlevel fractional crystallization. Since there is little evidence for magma chambers at these fracture zones, it is conclu ...
A long in situ section of the lower ocean crust: results of ODP Leg
... 18 km east of the present-day transform-slip zone and 95 km south of the SW Indian Ridge axis. At the time of accretion, however, it was only about 15 km from the active transform fault as there was subsequent transtensional extension across the transform due to a spreading direction change [6]. The ...
... 18 km east of the present-day transform-slip zone and 95 km south of the SW Indian Ridge axis. At the time of accretion, however, it was only about 15 km from the active transform fault as there was subsequent transtensional extension across the transform due to a spreading direction change [6]. The ...
Earth`s first two billion years—The era of internally
... The magmatic and tectonic processes of the pre–2.5 Ga hot, young Earth differed profoundly from those of the modern planet. The ancient rocks differ strikingly in individual and collective composition, occurrence, association, and structure from modern rocks. Widespread forcing of Archean geology in ...
... The magmatic and tectonic processes of the pre–2.5 Ga hot, young Earth differed profoundly from those of the modern planet. The ancient rocks differ strikingly in individual and collective composition, occurrence, association, and structure from modern rocks. Widespread forcing of Archean geology in ...
PDF
... 1997; Stern et al., 2003; Tamura et al., 2007; Tatsumi and Eggins, 1995]. Isotopic compositions also typically vary, with the transition from VF to RA marked by decreasingly radiogenic Sr, Nd, Hf, and Pb, although there are exceptions to this [Hochstaedter et al., 2001; Shibata and Nakamura, 1997; T ...
... 1997; Stern et al., 2003; Tamura et al., 2007; Tatsumi and Eggins, 1995]. Isotopic compositions also typically vary, with the transition from VF to RA marked by decreasingly radiogenic Sr, Nd, Hf, and Pb, although there are exceptions to this [Hochstaedter et al., 2001; Shibata and Nakamura, 1997; T ...
Visit Site - Geothermal Data Repository
... Figure 28. Injecting temperature profiles from November 17-20 .............................................................. 47 Figure 29. Detail of wellbore lower section during injecting surveys carried out in 2014. ........................ 48 Figure 30. Spinner and temperature log comparison from ...
... Figure 28. Injecting temperature profiles from November 17-20 .............................................................. 47 Figure 29. Detail of wellbore lower section during injecting surveys carried out in 2014. ........................ 48 Figure 30. Spinner and temperature log comparison from ...
Geologic Structures
... These organisms were biologically more complex than their Proterozoic ancestors, and many had shells and skeletons. The most recent 13 percent of geologic time, from 538 million years ago to the present, is called the Phanerozoic Eon (phaneros is Greek for “evident”). The Phanerozoic Eon is subdivid ...
... These organisms were biologically more complex than their Proterozoic ancestors, and many had shells and skeletons. The most recent 13 percent of geologic time, from 538 million years ago to the present, is called the Phanerozoic Eon (phaneros is Greek for “evident”). The Phanerozoic Eon is subdivid ...
Back Arc Extension in the Okinawa Trough
... Trough. Similar fault blocks with Pliocene sediments in their On the eastern side of the trough, the pre-late Miocene upper part also grew along faults facing the axis of the middle substratum occurs in the outer and southwestern zones of part of the trough, both on the southeastern flank and near K ...
... Trough. Similar fault blocks with Pliocene sediments in their On the eastern side of the trough, the pre-late Miocene upper part also grew along faults facing the axis of the middle substratum occurs in the outer and southwestern zones of part of the trough, both on the southeastern flank and near K ...
The track of the Yellowstone hot spot
... Snake River Plain are known to us for a hot spot/mantle plume. The following special characteristics of the North American plate and the western United States are probably important in how the Yellowstone hot spot is manifest. (1) The North American plate moves 2 to 3 cm/year southwestward, much fas ...
... Snake River Plain are known to us for a hot spot/mantle plume. The following special characteristics of the North American plate and the western United States are probably important in how the Yellowstone hot spot is manifest. (1) The North American plate moves 2 to 3 cm/year southwestward, much fas ...
alleghanian plutonism in the eastern blue ridge
... known Alleghanian faults (e.g. Batesburg, Buggs Island, Rabun, Walnut Creek) suggesting syncollisional emplacement (Speer et al. 1994). All of these hypotheses are viable explanations for the Alleghanian plutonism. Regardless, this research does not attempt to identify melting mechanisms but rather ...
... known Alleghanian faults (e.g. Batesburg, Buggs Island, Rabun, Walnut Creek) suggesting syncollisional emplacement (Speer et al. 1994). All of these hypotheses are viable explanations for the Alleghanian plutonism. Regardless, this research does not attempt to identify melting mechanisms but rather ...
PDF version - Western Washington University
... on its northern end with the Karakorum (Eurasian) plate is controversial. It has long been thought that this collision pre-dated Kohistan arc rifting (e.g., Petterson and Windley 1985) such that after 100 Ma the Kohistan arc was an Andean-type continental arc. However, more recent work suggests that ...
... on its northern end with the Karakorum (Eurasian) plate is controversial. It has long been thought that this collision pre-dated Kohistan arc rifting (e.g., Petterson and Windley 1985) such that after 100 Ma the Kohistan arc was an Andean-type continental arc. However, more recent work suggests that ...
Determination of fault friction from reactivation of
... Outer-slope faults begin to accommodate extension in the subducting plate in the outer rise at distances of 45–75 km from the trench axis (Masson, 1991; Kobayashi et al., 1998; Massell, 2002; Ranero et al., 2003). Reactivated abyssal-hill faults are identified by their orientation, which is parallel ...
... Outer-slope faults begin to accommodate extension in the subducting plate in the outer rise at distances of 45–75 km from the trench axis (Masson, 1991; Kobayashi et al., 1998; Massell, 2002; Ranero et al., 2003). Reactivated abyssal-hill faults are identified by their orientation, which is parallel ...
Linking Porphyry Deposit Geology to Geophysics via Physical
... In an effort to gain insight into subsurface geology, and to stimulate mineral exploration in till-covered regions of British Columbia, Geoscience BC carried out a series of regional and local magnetic and electromagnetic geophysical surveys in collaboration with the mineral exploration industry. As ...
... In an effort to gain insight into subsurface geology, and to stimulate mineral exploration in till-covered regions of British Columbia, Geoscience BC carried out a series of regional and local magnetic and electromagnetic geophysical surveys in collaboration with the mineral exploration industry. As ...
u series disequilibria: insights into mantle melting and
... a spectrometry measurements, and sample size requirements for mass spectrometry are also significantly less than for a spectrometry (e.g., U-Th, 0.1 – 2 mg versus 1 – 100 mg, and Pa-Ra, 0.003-1 pg versus 10– 50 pg) [Goldstein and Stirling, 2003]. This reduction in sample size has been especially adv ...
... a spectrometry measurements, and sample size requirements for mass spectrometry are also significantly less than for a spectrometry (e.g., U-Th, 0.1 – 2 mg versus 1 – 100 mg, and Pa-Ra, 0.003-1 pg versus 10– 50 pg) [Goldstein and Stirling, 2003]. This reduction in sample size has been especially adv ...
The East African rift system - Department of Earth and Planetary
... This overview paper considers the East African rift system (EARS) as an intra-continental ridge system, comprising an axial rift. It describes the structural organization in three branches, the overall morphology, lithospheric cross-sections, the morphotectonics, the main tectonic features—with emph ...
... This overview paper considers the East African rift system (EARS) as an intra-continental ridge system, comprising an axial rift. It describes the structural organization in three branches, the overall morphology, lithospheric cross-sections, the morphotectonics, the main tectonic features—with emph ...
Improved metagenome assemblies and taxonomic binning
... costs, however when used for analyzing complex communities data assembly typically requires ...
... costs, however when used for analyzing complex communities data assembly typically requires ...
The origin of metamorphic core complexes and detachment faults
... discussed in the previous section, the crust fails by faulting, but the faults are relatively small, and they do not penetrate deep into the crust. Below the stress guide, ductile flow relaxes the accumulating elastic stresses, so that lower stress levels are maintained. When the great earthquake oc ...
... discussed in the previous section, the crust fails by faulting, but the faults are relatively small, and they do not penetrate deep into the crust. Below the stress guide, ductile flow relaxes the accumulating elastic stresses, so that lower stress levels are maintained. When the great earthquake oc ...
Global Correlations of Ocean Ridge Basalt Chemistry with Axial
... The petrological parameters Na8 and Fe8, which are Na2O and FeO contents in mid-ocean ridge basalt (MORB) melts corrected for fractionation effects to MgO ¼ 8 wt%, have been widely used as indicators of the extent and pressure of mantle melting beneath ocean ridges. We find that these parameters are ...
... The petrological parameters Na8 and Fe8, which are Na2O and FeO contents in mid-ocean ridge basalt (MORB) melts corrected for fractionation effects to MgO ¼ 8 wt%, have been widely used as indicators of the extent and pressure of mantle melting beneath ocean ridges. We find that these parameters are ...
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.