Rb-Sr dating of sphalerites from Mississippi Valley-type (MVT) ore deposits
نویسندگان
چکیده
منابع مشابه
Rb-Sr dating of sphalerites from Mississippi Valley-type (MVT) ore deposits
Mississippi Valley-type (MVT) ore deposits arc epigenetic carbonate-hosted Pb-Zn deposits that contain galena, sphalerite, fluorite, bar&e, dolomite, calcite, and quartz. Although they are thought to form from basinal brines, their exact origins are still unclear, partly because of the scarcity of reliable geochronological data. Rb-Sr dating of sphalerites has recently been shown to be a promis...
متن کاملMineralogy and Chemistry of Oxidized Ores from the Upper Silesia Mississippi Valley-type Zinc- Lead Deposits, Poland
1999 This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
متن کاملFormation and exhumation of blueschists and eclogites from NE Oman: new perspectives from Rb–Sr and Ar/Ar dating
Seven eclogite facies samples from lithologically different units which structurally underlie the Semail ophiolite were dated by the Ar/Ar and Rb–Sr methods. Despite extensive efforts, phengite dated by the Ar/Ar method yielded saddle, hump or irregularly shaped spectra with uninterpretable isochrons. The total gas ages for the phengite ranged from 136 to 85 Ma. Clinopyroxene–phengite, epidote–...
متن کاملThe Hercynian ore deposits from the Catalonian Coastal Ranges
reservas, similares procesos metalogenéticos habrian actuado en el Paleozoico Inferior del Brea. La deformación y el metamorfisme regional hercinicos no han actuado en este sector como un importante reconcentrador de menas, y la mayor parte de indicios epigenéticos Many mineralizations, showings and geochemical anomalies de edad tardihercinicaestán relacionados alas células hidrotermales have b...
متن کاملDating Sinter Deposits in Northern Dixie Valley, Nevada- the Paleoseismic Record and Implications for the Dixie Valley Geothermal System
A series of fossil spring deposits are exposed along the Dixie Valley fault just south of the producing geothermal field, in an area now characterized by active fumaroles and steaming ground. These deposits are composed of both travertine and sinter that have trapped pollen and other plant material during their formation. Radiocarbon dates on the organic material indicate that the youngest hot ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Geochimica et Cosmochimica Acta
سال: 1993
ISSN: 0016-7037
DOI: 10.1016/0016-7037(93)90440-8