نتایج جستجو برای: period deep crustal exploration
تعداد نتایج: 776957 فیلتر نتایج به سال:
To directly access the sub-seafloor microbial communities, seafloor drilling has been done in a deep-sea hydrothermal field of the Suiyo Seamount, Izu-Bonin Arc, Western Pacific. In the present study, crustal fluids were collected from the boreholes, and the bacterial and archaeal communities in the fluids were investigated by culture-independent molecular analysis based on 16S rRNA gene sequen...
Mars was most active during its first billion years. The core, mantle, and crust formed within approximately 50 million years of solar system formation. A magnetic dynamo in a convecting fluid core magnetized the crust, and the global field shielded a more massive early atmosphere against solar wind stripping. The Tharsis province became a focus for volcanism, deformation, and outgassing of wat...
[1] Regional 2D multichannel seismic, borehole, dredge and outcrop data, together with burial models for strata in southwest Iberia, are used to investigate the tectono-stratigraphic signature of multiphased rifting on divergent margins. Our burial model reveals that Mesozoic extension occurred during three main phases, each comprising distinct subsidence pulses separated by short-lived periods...
Laboratory experiments have established that many earth materials are strongly anisotropic. Observations of azimuthal and radial anisotropy in the upper mantle are attributed to the lattice-preferred orientation (LPO) of olivine caused by the shear strains associated with deformation, and provide some of the most direct evidence for deformation and flow within Earth’s interior. Although observa...
High-quality seismic data recorded during the 1999 Taiwan Chi-Chi earthquake (Mw=7.6) show that a smallscale orogenic process of both mountain-building and crust-thickening was simultaneously accomplished along one set of crustal-scale conjugated faults. Mountain-building near the surface was primarily produced by the main shock along an eastward low-angle thrust fault in the upper crust. In th...
S U M M A R Y Global tomographic models collected in the Seismic wave Propagation and Imaging in Complex (SPICE media: a European network) model library (http://www.spicertn.org/research/planetaryscale/tomography/) share a similar pattern of long, spatial wavelength heterogeneity, but are not consistent at shorter spatial wavelengths. Here, we assess the performance of global tomographic models...
[1] Lateral variations of the crustal structure in southern California are determined from receiver function (RF) studies using data from the Southern California Seismic Network broadband stations and Los Angeles Regional Seismic Experiment surveys. The results include crustal thickness estimates at the stations themselves, and where possible, cross sections are drawn. The large-scale Moho dept...
[1] Noble gas concentrations and isotopic ratios are presented for 38 deep ( 0.5–3.6 km) brine samples in the Michigan Basin. These brine samples clearly show the presence of an important crustal component of He, Ne, Ar, and Xe. Both Arcrust and Xecrust display the presence of a strong vertical gradient along the sedimentary strata of the basin. We show that the in situ production for these two...
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