- Free Documents
... basement of Sumba reveals faulting with rifted blocks Wensink. is very complicated. This implies that. Sumba was once part of Sundaland which drifted southwards during the opening of the marginal seas in the eastern margin of Sundaland at present. When Sumba is restored by a counterclockwise rotatio ...
... basement of Sumba reveals faulting with rifted blocks Wensink. is very complicated. This implies that. Sumba was once part of Sundaland which drifted southwards during the opening of the marginal seas in the eastern margin of Sundaland at present. When Sumba is restored by a counterclockwise rotatio ...
Subducting slabs: Jellyfishes in the Earth`s mantle
... where r is the density, g the gravitational acceleration, p the pressure field, m the dynamic viscosity and u the velocity. [6] Interfaces (between the slab, upper mantle and lower mantle) are advected by using the computed velocity field and are tracked by a dual method combining Lagrangian particl ...
... where r is the density, g the gravitational acceleration, p the pressure field, m the dynamic viscosity and u the velocity. [6] Interfaces (between the slab, upper mantle and lower mantle) are advected by using the computed velocity field and are tracked by a dual method combining Lagrangian particl ...
Magmatic Apatite: A Powerful, Yet Deceptive
... also exhibit some nonideality (Hovis et al. 2014). Similar information on the Cl–OH join and F–Cl–OH ternary currently don’t exist and are sorely needed for the study of rocks that contain apatite of these compositions. Estimates of fluid, as well as melt, Cl contents can be made. Piccoli and Candel ...
... also exhibit some nonideality (Hovis et al. 2014). Similar information on the Cl–OH join and F–Cl–OH ternary currently don’t exist and are sorely needed for the study of rocks that contain apatite of these compositions. Estimates of fluid, as well as melt, Cl contents can be made. Piccoli and Candel ...
USGS Professional Paper 1697 - Alaska Resources Library and
... http://pubs.usgs.gov//pp/p1692/ Additional USGS publications can be found at: http://geology.usgs.gov/products.html For more information about the USGS and its products: Telephone: 1–888–ASK–USGS (1–888–275–8747) World Wide Web: http://www.usgs.gov/ ...
... http://pubs.usgs.gov//pp/p1692/ Additional USGS publications can be found at: http://geology.usgs.gov/products.html For more information about the USGS and its products: Telephone: 1–888–ASK–USGS (1–888–275–8747) World Wide Web: http://www.usgs.gov/ ...
- ERA - University of Alberta
... Dr. Peter DeCelles is thanked for guiding me to use geological observations to understand this study. He is a great source of inspiration. I owe great thanks to my family. My parents set no requirement for me but to be a decent person. My family teaches me to be strong in difficult times and do so w ...
... Dr. Peter DeCelles is thanked for guiding me to use geological observations to understand this study. He is a great source of inspiration. I owe great thanks to my family. My parents set no requirement for me but to be a decent person. My family teaches me to be strong in difficult times and do so w ...
Global geochemical variation of mid-ocean ridge basalts - UiO
... heterogeneities ranging from sub-grain to ocean basin scale. Not only these passive heterogeneities, but also hotspots providing hot mantle material containing recycled components by locally confined upwelling, therefore have a geophysical as well as a geochemical impact on MORs and MORB generation. ...
... heterogeneities ranging from sub-grain to ocean basin scale. Not only these passive heterogeneities, but also hotspots providing hot mantle material containing recycled components by locally confined upwelling, therefore have a geophysical as well as a geochemical impact on MORs and MORB generation. ...
PDF
... Longmen Mountain fracture zone, reveals a large-scale slow deformation in which the crust cuts down, comparatively, the Longmen Mountain fracture zone, mainly revolving and wrenching it towards the right, while the compressional deformation is smaller. The annual gross deformation from revolving and ...
... Longmen Mountain fracture zone, reveals a large-scale slow deformation in which the crust cuts down, comparatively, the Longmen Mountain fracture zone, mainly revolving and wrenching it towards the right, while the compressional deformation is smaller. The annual gross deformation from revolving and ...
Mantle structure and tectonic history of SE Asia
... models created from P-wave travel times. We then introduce the global P-wave velocity anomaly model UUP07 and the tectonic model used in this paper and give an overview of previous interpretations of mantle structure. The slab-related velocity anomalies we identify in the upper and lower mantle base ...
... models created from P-wave travel times. We then introduce the global P-wave velocity anomaly model UUP07 and the tectonic model used in this paper and give an overview of previous interpretations of mantle structure. The slab-related velocity anomalies we identify in the upper and lower mantle base ...
Fall 2012 - Washtenaw Community College
... 1. Explain the nature of scientific inquiry and the scientific method. Matched Outcomes 2. Describe the theory or hypothesis (nebular hypothesis) for the origin of the solar system and Earth. Matched Outcomes 3. Summarize the components of the Earth system and describe its interrelated spheres. Matc ...
... 1. Explain the nature of scientific inquiry and the scientific method. Matched Outcomes 2. Describe the theory or hypothesis (nebular hypothesis) for the origin of the solar system and Earth. Matched Outcomes 3. Summarize the components of the Earth system and describe its interrelated spheres. Matc ...
Static and dynamic support of western United States topography
... constrained for wavelengths λ 1500 km. 2.3. Structural models for the lithosphere For topography, we use the ETOPO2 (NOAA, 2006) digital elevation model, only considering topography above sea level (Fig. 1a). We tested a range of seismologically defined models for crust and lithospheric structure. ...
... constrained for wavelengths λ 1500 km. 2.3. Structural models for the lithosphere For topography, we use the ETOPO2 (NOAA, 2006) digital elevation model, only considering topography above sea level (Fig. 1a). We tested a range of seismologically defined models for crust and lithospheric structure. ...
Petrogenetic evolution of Uralian-Alaskan-type mafic
... Uralian-Alaskan-type mafic to ultramafic complexes form a narrow, 900 km long, N-Strending chain in the northern and central parts of the Ural orogenic belt. Characteristic features like their concentric lithologic zonation, the absence of orthopyroxene in the ultramafic rocks and platinum group ele ...
... Uralian-Alaskan-type mafic to ultramafic complexes form a narrow, 900 km long, N-Strending chain in the northern and central parts of the Ural orogenic belt. Characteristic features like their concentric lithologic zonation, the absence of orthopyroxene in the ultramafic rocks and platinum group ele ...
Kerguelen Hotspot Magma Output since 130 Ma
... gravity lineament (Coffin & Gahagan, 1995) just south of ODP Site 747 (Fig. 2). To calculate the volume of the >120 to >110 Ma portion of the Kerguelen Plateau, we used its areal and vertical dimensions, the latter obtained primarily through wide-angle seismic data (Operto & Charvis, 1995, 1996) and g ...
... gravity lineament (Coffin & Gahagan, 1995) just south of ODP Site 747 (Fig. 2). To calculate the volume of the >120 to >110 Ma portion of the Kerguelen Plateau, we used its areal and vertical dimensions, the latter obtained primarily through wide-angle seismic data (Operto & Charvis, 1995, 1996) and g ...
An ultraslow-spreading class of ocean ridge
... Figure 3 SWIR oblique supersegment bathymetric, mantle Bouguer and magnetization maps. a, 200-m contoured gridded bathymetry. b, Mantle Bouguer gravity anomaly. c, Crustal magnetization as the product of a nonlinear inversion that removed the topographic effect and the distortion resulting from the ...
... Figure 3 SWIR oblique supersegment bathymetric, mantle Bouguer and magnetization maps. a, 200-m contoured gridded bathymetry. b, Mantle Bouguer gravity anomaly. c, Crustal magnetization as the product of a nonlinear inversion that removed the topographic effect and the distortion resulting from the ...
An ultraslow-spreading class of ocean ridge
... Figure 3 SWIR oblique supersegment bathymetric, mantle Bouguer and magnetization maps. a, 200-m contoured gridded bathymetry. b, Mantle Bouguer gravity anomaly. c, Crustal magnetization as the product of a nonlinear inversion that removed the topographic effect and the distortion resulting from the ...
... Figure 3 SWIR oblique supersegment bathymetric, mantle Bouguer and magnetization maps. a, 200-m contoured gridded bathymetry. b, Mantle Bouguer gravity anomaly. c, Crustal magnetization as the product of a nonlinear inversion that removed the topographic effect and the distortion resulting from the ...
Oxygen-isotope and trace element constraints on the origins of silica
... dacitic) hydrous melt inclusions that were likely trapped when these rocks were within the upper mantle wedge underlying the arc. These melt inclusions have been previously interpreted to be slab-derived melts. We tested this hypothesis by analyzing the oxygen isotope compositions of these inclusion ...
... dacitic) hydrous melt inclusions that were likely trapped when these rocks were within the upper mantle wedge underlying the arc. These melt inclusions have been previously interpreted to be slab-derived melts. We tested this hypothesis by analyzing the oxygen isotope compositions of these inclusion ...
The Seismic Structure of Island Arc Crust
... melt in a locally thickened crustal section (Molnar and Atwater 1978; Kuzsnir and Park 1987). Although arc rifting primarily occurs on the back-arc side of the arc, it can also be centered on the arc, or even in the forearc, resulting in the latter case in the two magma sources, associated with subd ...
... melt in a locally thickened crustal section (Molnar and Atwater 1978; Kuzsnir and Park 1987). Although arc rifting primarily occurs on the back-arc side of the arc, it can also be centered on the arc, or even in the forearc, resulting in the latter case in the two magma sources, associated with subd ...
Trace Element and Isotope Geochemistry of the Volcanic Rocks of
... are higher and Nd ratios are lower than those of the IHS. The the Lesser Antillean arc (Fig. 1), which formed along IDS is also characterized by high dla0 values, up to 7-6 in the eastern edge of the Caribbean Plate as a result of clinopyroxene. The Sr and Pb isotope ratios are too high, and the sub ...
... are higher and Nd ratios are lower than those of the IHS. The the Lesser Antillean arc (Fig. 1), which formed along IDS is also characterized by high dla0 values, up to 7-6 in the eastern edge of the Caribbean Plate as a result of clinopyroxene. The Sr and Pb isotope ratios are too high, and the sub ...
Radiogenic isotopes - Department of Geological Sciences
... (4) How can radiogenic isotopes be used as a stratigraphic correlation tool, as a tracer of groundwater and surface water evolution, and as a means of determining the relative and absolute ages of rocks and minerals? This paper will first summarize the principles of radioactive decay, the isotope ev ...
... (4) How can radiogenic isotopes be used as a stratigraphic correlation tool, as a tracer of groundwater and surface water evolution, and as a means of determining the relative and absolute ages of rocks and minerals? This paper will first summarize the principles of radioactive decay, the isotope ev ...
Late Cenozoic evolution of the eastern margin of the Tibetan
... tectonics-general (0905), 9320 Information related to geographic region: Asia, 8102 Tectonophysics: Continental contractional orogenic belts; KEYWORDS: Tibetan Plateau, thermochronology, denudation, relief ...
... tectonics-general (0905), 9320 Information related to geographic region: Asia, 8102 Tectonophysics: Continental contractional orogenic belts; KEYWORDS: Tibetan Plateau, thermochronology, denudation, relief ...
PETROLOGY AND GEOCHEMISTRY OF THE WILDCAT GULCH
... Southwest of Gunnison, Colorado, within the Wildcat Gulch study area, syenitoid plutons intrude the Proterozoic Dubois Greenstone. Limited work has been done to document their lithologic character, ascertain their origin, or place them within the regional geology of central Colorado. These syenitoid ...
... Southwest of Gunnison, Colorado, within the Wildcat Gulch study area, syenitoid plutons intrude the Proterozoic Dubois Greenstone. Limited work has been done to document their lithologic character, ascertain their origin, or place them within the regional geology of central Colorado. These syenitoid ...
Leseane_okstate_0664M_13248
... We use aeromagnetic and Bouguer gravity data from the incipient Okavango Rift Zone (ORZ), the surrounding Archean cratons and Proterozoic mobile belts in northwestern Botswana to estimate the depth to the Curie isotherm and the crustal thickness beneath the rift. Imaging the depth to the base of mag ...
... We use aeromagnetic and Bouguer gravity data from the incipient Okavango Rift Zone (ORZ), the surrounding Archean cratons and Proterozoic mobile belts in northwestern Botswana to estimate the depth to the Curie isotherm and the crustal thickness beneath the rift. Imaging the depth to the base of mag ...
Chemical Geodynamics - Woods Hole Oceanographic Institution
... Chemical geodynamics, developed by Allegre (1982) as an integrated study of the chemical and physical structure and evolution of the solid Earth, is a field of inquiry that has evolved from a marriage of mantle geochemistry and geophysics. By its very nature, geophysics can only characterize the pre ...
... Chemical geodynamics, developed by Allegre (1982) as an integrated study of the chemical and physical structure and evolution of the solid Earth, is a field of inquiry that has evolved from a marriage of mantle geochemistry and geophysics. By its very nature, geophysics can only characterize the pre ...
Slab behaviour and its surface expression: new insights
... Department of Geosciences, Oregon State University, Corvallis, OR 97331-5506, USA Received 21 March 2003; accepted 16 December 2003 ...
... Department of Geosciences, Oregon State University, Corvallis, OR 97331-5506, USA Received 21 March 2003; accepted 16 December 2003 ...
Influence of continental roots and asthenosphere on plate
... is thinner than 100 km and is less than a factor of 2 if it is 200 km thick. Thus, even if continental roots are underlain by a thin asthenosphere [e.g., Gung et al., 2003], mantle tractions on their base may remain large compared to regions with thinner lithosphere. We find that the presence of an ...
... is thinner than 100 km and is less than a factor of 2 if it is 200 km thick. Thus, even if continental roots are underlain by a thin asthenosphere [e.g., Gung et al., 2003], mantle tractions on their base may remain large compared to regions with thinner lithosphere. We find that the presence of an ...
thesis
... Norway. The SIP comprises a suite of mainly gabbroic plutons, with ultramafic, syenitic and felsic intrusions. The origin of the region has been interpreted in different ways and several tectonic models have been proposed. Many different ideas have been suggested about the metamorphic, magmatic and ...
... Norway. The SIP comprises a suite of mainly gabbroic plutons, with ultramafic, syenitic and felsic intrusions. The origin of the region has been interpreted in different ways and several tectonic models have been proposed. Many different ideas have been suggested about the metamorphic, magmatic and ...
Baltic Shield
The Baltic Shield (sometimes referred to as the Fennoscandian Shield) is located in Fennoscandia (Norway, Sweden and Finland), northwest Russia and under the Baltic Sea. The Baltic Shield is defined as the exposed Precambrian northwest segment of the East European Craton. It is composed mostly of Archean and Proterozoic gneisses and greenstones which have undergone numerous deformations through tectonic activity (see Geology of Fennoscandia map [1]). The Baltic Shield contains the oldest rocks of the European continent. The lithospheric thickness is about 200-300 km. During the Pleistocene epoch, great continental ice sheets scoured and depressed the shield's surface, leaving a thin covering of glacial material and innumerable lakes and streams. The Baltic Shield is still rebounding today following the melting of the thick glaciers during the Quaternary Period.