نتایج جستجو برای: fractured rocks by fault
تعداد نتایج: 7096324 فیلتر نتایج به سال:
INTRODUCTION The Barketille subterrane is part of the peri-cratonic Kootenay termne, deposited along the western edge of ancestral North America. The Kooteoay temme, and possible correlative rocks of northern British Columbia and Yukon, contain numc~ous volcanogenic massive solphide deposits, concentrated largely in EoCambrian to Early Cambrian and Middle Devonian to Early Mississippian times. ...
[1] The role of phyllosilicate fabrics in fault gouge is a poorly understood component of the mechanical and hydrologic behavior of brittle fault zones. We present 90 fabric intensity measurements using X-ray texture goniometry on 22 natural clay-rich fault gouges from low-angle detachment faults (Death Valley area detachments, California; Ruby Mountains, Nevada; West Salton Detachment Fault, C...
[1] Phyllosilicates have been identified on the Martian surface from orbit, and are hypothesized to have formed under wet, non-acidic conditions early in the planet’s history. Exposures of these minerals have not yet been examined by a landed mission. Using Mars Reconnaissance Orbiter data, we report the detection of phyllosilicatebearing outcrops that may be accessible by the Mars Exploration ...
misho intrusions outcrop in the southern part of north tabriz fault, east misho mountains, nw tabriz. filed studies, petrological and geochemical data show that both mafic and felsic rock types occur in the area. mafic rocks include gabbro consisting of plagioclase, clinopyroxene, olivine and opaque minerals and felsic bodies consist of alkali granite with k-feldspar, quartz, plagioclase and a ...
Volcanic rocks along the Panama Canal present a world-class opportunity to examine the relationship between arc magmatism, tectonic forcing, wet and dry magmas, and volcanic structures. Major and trace element geochemistry of Canal volcanic rocks indicate a significant petrologic transition at 21-25 Ma. Oligocene Bas Obispo Fm. rocks have large negative Nb-Ta anomalies, low HREE, fluid mobile e...
Fracture network is a crucial element to address in any model of the thermo-hydro-mechanical behaviour reservoir rock. This study aims provide quantified datasets and further understanding critical parameters fracture pattern crystalline rocks. In Northern Upper Rhine Graben, such rock units are targeted for multiple energy applications, from deep geothermal heat extraction storage. Eleven outc...
A geological and speleological investigation was conducted in the famous Blue Cave (Modra špilja) Monk Seal (Medvidina on Biševo Island (Croatia) to promote island’s geoheritage through new Visitor Centre. The island is mainly composed of Cretaceous Paleogene neritic carbonates, which form bedrock, whereas parts are covered with thin Quaternary sediments. caves small dimensions a simple layout,...
Neyzar iron deposit is located about 50 km southwest Mashhad, northeast Iran. It was developed as layered and discontinuous lenses in a fault zone within quartz-arenite and sub-litharenite sandstones of Lalun Formation (Lower Cambrian). Mineralographical studies show that hematite is the principal iron ore mineral accompanied by goethite and lesser amounts of pyrite. Microscopic examinations c...
Groundwater development in fractured hard rock aquifers has always assumed a secondary role compared with that in unconsolidated alluvial strata or in soluble carbonate rocks. This is because of the nonextensive, irregular, nonisotropic, and inhomogeneous nature of the aquifer and the relatively small yields of water available from dug-wells or drilled bores. However, many of the highly populat...
Knowledge-and data-driven approaches are two major methods used to integrate various evidential maps for mineral prospectivity mapping (MPM). Geological maps, geochemical samples and data from known gold deposits were collected in the western Junggar area, Xinjiang Province. The geological and a spatial database for geological and mineral occurrences were constructed for the studied region. A w...
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