نتایج جستجو برای: feldspar deposit
تعداد نتایج: 19031 فیلتر نتایج به سال:
The Ghoshchi batholith, ~150 km2 in size is a granitoidic pluton, which intruded the Permian country rocks, in Sanandaj-Sirjan Zone, NW Iran. This granitoidic pluton is covered by Oligocene-Miocene sedimentary rocks known as Qom Formation. The Ghoshchi batholith comprises five plutons with following compositions: (a) gabbro-diorite (b) biotite granite, (c) alkali granite, (d) syenites, and (e) ...
This paper explores sources of deposit dollarization unrelated to standard moral hazard arguments. We develop a model in which banks choose the optimal currency composition of their liabilities. We argue that the equal treatment of peso and dollar claims in the event of bank default can induce banks to attract dollar deposits above the socially desirable level. The distortion arises because dol...
Using data from the Diviner Lunar Radiometer Experiment, we show that four regions of the Moon previously described as "red spots" exhibit mid-infrared spectra best explained by quartz, silica-rich glass, or alkali feldspar. These lithologies are consistent with evolved rocks similar to lunar granites in the Apollo samples. The spectral character of these spots is distinct from surrounding mare...
Gold deposits in the Jiaodong Peninsula represent a primary gold resource China and mostly exhibit similar ore-forming features related to sericite-quartz-pyrite alteration other controls from (micro-)structural deformation. This study investigates pyrite textures trace elements Sizhuang deposit (>100 t Au) document key factors impacting on genesis of Jiaodong-type orogenic deposits. Three m...
The present study provides an overview of the ice nucleation activity of different feldspars varying in their chemical composition and crystal structure. In total 15 different feldspars including plagioclase and alkali feldspars were analyzed for one weight percentage using a special freezing array method called μl-NIPI (microliter Nucleation by Immersed Particle Instrument). Additionally, the ...
Samples of Fish Canyon and Cobb Mountain sanidine monitor standards, irradiated and fused with 7 W of CO laser 2 power for ArrAr geochronology analyses, give Pb isotope composition and Pb concentrations that are indistinguishable from unprocessed aliquots of the same monitors. The absence of measurable change in Pb isotope composition indicates the feasibility of measuring the Pb isotope compos...
Abstract The Coles Hill uranium deposit, with an indicated resource of about 130 Mlb U3O8, is the largest unmined deposit in United States. hosted Taconian (approx. 480–450 Ma) Martinsville igneous complex, which consists Ordovician Leatherwood Granite (granodiorite) and Silurian Rich Acres Formation (diorite). host rock was metamorphosed to orthogneiss during Alleghanian orogeny 325–260 Ma), w...
The objective of this study is to describe the mineralogical composition and chemical properties Ora?u Nou bentonite, from northwestern Romania. For determinations, following were used: X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FR-IR), thermogravimetric analysis, scanning electron microscopy coupled with energy-dispersive (SEM-EDX). compositions physical bentonites bento...
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