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Journal Article
Journal: Lithosphere
Published: 11 October 2017
Lithosphere (2017) 9 (6): 987-1001.
..., the geometry, strength, and extent of lithospheric deformation associated with these events are poorly known. Observations of seismic anisotropy in the continental lithosphere can shed light on past deformation processes, but information about the depth distribution of anisotropy is needed. Here we investigate...
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Journal Article
Journal: Geology
Published: 29 June 2017
Geology (2017) 45 (9): 779-782.
... with variable k (values in figure) and H = 0 µW/m 3 overlying 12-km-thick body ( H varies, k = 2.5 W/m/K) (C). D: Change of temperature with depth (black lines) for different crustal compositions (GS—granite with sedimentary cover; CS—“normal” crust with sedimentary cover; UC—uniform “normal” crust; G0...
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... kbar). These results imply that the protoliths of the garnet pyroxenite formed at a range of depths from ~50 to 100 km, and then during or shortly after cooling, they were tectonically emplaced to higher levels (~40–60 km; i.e., uplifted by at least 10–20 km) along the prevailing geotherm. This uplift...
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Series: Geological Society, London, Special Publications
Published: 01 January 2016
DOI: 10.1144/SP434.13
EISBN: 9781862391581
... such as available food, nutrients, temperature, dissolved oxygen, salinity, water depth and turbidity. The EFP-2001 project ( Ineson et al. 2004 a ) ‘Genetic high-resolution stratigraphy of the upper Maastrichtian, Danish Central Graben’ included an integration of biostratigraphy and palaeoecology with stable...
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Series: Geological Society, London, Special Publications
Published: 01 January 2016
DOI: 10.1144/SP431.7
EISBN: 9781862399631
.... western Côte d’Ivoire transform margin: de Caprona 1992 ; French Guiana: Basile et al. 2013 ). Also, recent studies showed that a third of transform margins bound marginal plateaus, reliefs defined as deep submarine plateaus extending the continental shelf down to a depth of 3000 m. This is the case...
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Series: Geological Society, London, Special Publications
Published: 01 January 2016
DOI: 10.1144/SP431.13
EISBN: 9781862399631
.... The focus of this paper is our geochemical analysis and integration. The other steps have been broadly and well described in the published literature and will only be summarized here. Our geophysical compilation and depth inversion methods have been described in Odegard et al. (2007) . Primary 1 km...
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Series: Geological Society, London, Special Publications
Published: 01 January 2016
DOI: 10.1144/SP431.3
EISBN: 9781862399631
... (2 km) water depths, with a basin and ridge morphology similar to other strike-slip-controlled borderlands, including that of offshore southern California ( Rogers & Mann 2007 ) (Fig. 1 ). The HB is an ideal area to study the controls of strike-slip margin tectonics on the evolution of basins...
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Series: GSA Special Papers
Published: 01 May 2015
DOI: 10.1130/2015.2511(06)
Series: GSA Special Papers
Published: 01 May 2015
DOI: 10.1130/2015.2511(08)
Series: Geological Society, London, Special Publications
Published: 01 January 2015
DOI: 10.1144/SP422.4
EISBN: 9781862397460
... of the Região dos Picos fissure zone is available at www.geolsoc.org.uk/SUP18818 The depth at which a magma reservoir may form is commonly determined by a neutral buoyancy condition between the ascending magma and its immediate surroundings. The magma reaches isostatic equilibrium with the host rock...
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Series: GSA Special Papers
Published: 01 January 2015
DOI: 10.1130/2014.2509(08)
... at the surface of the Earth by groundwater recharge with subsequent pore-fluid pressure diffusion propagating to the hypocenter. The transient behavior of pore-fluid pressure is examined at the focal depth of 8 km. These results are compared with the duration and timing of base flow (groundwater recharge...
Series: GSA Special Papers
Published: 01 January 2015
DOI: 10.1130/2015.2509(15)
.... The hypocenter locations define a 1–2-km-wide cloud with a strike of ~029° and dip of ~53°E, consistent with the focal mechanism of the main shock. The cloud bends ~5° along strike and has a slightly shallower dip angle below ~6 km depth, indicating a broad, complex fault zone with a slightly concave shape...
Series: GSA Memoirs
Published: 01 January 2014
DOI: 10.1130/2014.1211(13)
... pluton, located at the western edge of the deformation zone, and a 5–6.3 kbar pressure for the 100 Ma Lakeview Mountains pluton, emplaced in the eastern part, the latter being coeval with the formation of the deformation zone. If temperature increase is attributable entirely to difference in depth...
Series: GSA Special Papers
Published: 01 August 2013
DOI: 10.1130/2013.2497(10)
... lavas generally contained less than 0.3% dissolved H 2 O; however, the presence of rare disequilibrium An 96 plagioclase phenocrysts suggests that some magmas may have originally had 4.5 wt% dissolved H 2 O at depth, but they all degassed during ascent and eruption. The size of plagioclase phenocrysts...
Series: GSA Field Guide
Published: 01 January 2013
DOI: 10.1130/2013.0033(07)
EISBN: 9780813756332
... at crustal depths from ~25 km to 12 km. Furthermore, metasedimentary rocks within the upper third of the Picuris section that were once thought to be Paleoproterozoic in age are now known to be Mesoproterozoic in age ( Jones et al., 2011 ; Daniel et al., 2013 ), and regional metamorphism and deformation...
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Series: GSA Special Papers
Published: 01 September 2010
DOI: 10.1130/2010.2465(06)
... method would have been insufficient. The focus is on the ways in which variations in impact angle and target water depth affect water-cavity collapse, the initiation and continuation of the resurge, its transformation into a central water plume, and subsequent antiresurge, as well as tsunami generation...
Series: GSA Special Papers
Published: 01 May 2009
DOI: 10.1130/2009.2450(06)
... than 30 m of water, median grain sizes in this unit range from ~6 μm to more than 30 μm, with the coarsest grain sizes associated with beach or shallow-water deposits. Similar grain-size variations are observed as a function of water depth in the modern lake and provide the basis for interpreting...
Series: GSA Special Papers
Published: 01 May 2009
DOI: 10.1130/2009.2450(12)
... to that in the modern lake, grain-size distributions provide estimates of past lake depths. Sedimentary textures provide a highly sensitive, continuous record of lake-level changes, but the modern distribution of fabrics is poorly constrained, and many ancient features have no modern analog. Combining the three types...
... that record less focused magmatism. The percentage of igneous rocks increases systematically from shallow to middle to deep levels, from ~37% to 55% to 65% of the total rock volume. Unfocused magmas comprise much higher percentages (~19%) of the total plutonic rock at deep- and mid-crustal depths, but only ~1...