نتایج جستجو برای: amphibolite facies
تعداد نتایج: 5779 فیلتر نتایج به سال:
New U-Pb monazite ages from amphibolite-facies metasedimentary rocks the Tennant Region, Murphy Inlier and intervening East area, together with existing data, reveal presence of an 1860–1840 Ma tectono-magmatic domain over 600 km long towards centre North Australian Craton. In-situ ion probe dating biotite-hosted in schist Region yielded age 1858 ± 7 Ma, which is attributed to north–south short...
Permission to copy is restricted to an abstract of not more than 300 words. Illustrations may not be copied. The abstract should contain conspicuous acknowledgement of where and by whom the paper was presented. Abstract This paper proposes an annealing-type algorithm for generating multiple realizations of facies distributions that: (i) honor the facies data at well locations, (ii) match global...
Abstract The crystal chemistry and structure of the rare earth element phosphates, monazite-(Ce), Ce(PO 4 ), xenotime-(Y), Y(PO as well arsenates, gasparite-(Ce), Ce(AsO chernovite-(Y), Y(AsO from hydrothermal quartz-bearing fissures, related to pegmatites overprinted by amphibolite facies, cropping out at Mt. Cervandone, Western Alps, Piedmont, Italy, have been investigated means electron micr...
Physical properties of sediments are commonly used to define subsurface lithofacies and these same physical properties influence subsurface microbial communities. This suggests an (unexploited) opportunity to use the spatial distribution of facies to predict spatial variation in biogeochemically relevant microbial attributes. Here, we characterize three biogeochemical facies-oxidized, reduced, ...
Located at the westernmost tip of Mediterranean, Gibraltar Arc is a segment Alpine belt that exhibits peridotite massifs associated with high-grade crustal metamorphic units. The timing and mechanisms exhumation these crust–mantle associations are still debated in Rif Morocco as well Betic Cordilleras Spain. A structural, petrographic, geochronological study ( 40 Ar– 39 Ar method) performed Ben...
Mg-Fe2+ diffusion patterns in olivine and chromite are useful tools for the study of thermal history ultramafic massifs. In present contribution, we applied exponential modeling to geothermometry geospeedometry chromitite ores from two different ophiolite contexts. The Iballe (Northern Albania) hosts several pods within dunites. Primary re-equilibrated Mg#, estimated by using an function, provi...
The amphibolites of east Salmas, as one of the widest units of the metamorphic complex, are located in the northwest of Sanandaj-Sirjan zone, which according to field studies are mainly oriented and foliated amphibolites. Based on microscopic studies, amphibolites include amphibolites, biotite-amphibolites, epidote-amphibolite, biotite-epidote-amphibolite, tremolite-actinolite-amphibolite, and ...
We have done a geostatistical inversion of seismic data to facies probabilities. As a first step, we invert the seismic data for elastic parameters using the Bayesian AVA inversion method of Buland et. al. (2003). Next, we use an analysis of the uncertainty in the posterior distribution to filter the elastic parameters given in well logs. By comparing these filtered well logs with facies logs, ...
Gasht metamorphic complex is situated in the Talesh mountains of western Alborz range. This metamorphic complex consists mainly of metapelite and metabasite. Metabasites display metamorphic conditions of amphibolite and greenschist facies. Mineralogical paragenesis of greenschists are amphibole, feldspar and epidot and clinopyroxene occures as accessory minerals. The amphibolites of Gasht metam...
Remains of hominoid primates collected by Yale Peabody Museum Geological Survey of Pakistan expeditions to the Siwalik Group rocks of the Potwar Plateau, Pakistan, are described. They consist of facial, gnathic, dental, and postcranial remains of Ramapithecus, Sivapithecus, and Gigantopithecus. They are discussed anatomically and without precise taxonomic attributions. The hominoids come from 2...
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