The exhumed 'Carlin-type' fossil oil reservoir at Yankee Basin
| Autor: | Bill Stout, David K. Curtiss, Jeffrey B. Hulen, Nicola F. Dahdah, James W. Collister |
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| Rok vydání: | 1998 |
| Předmět: |
Canyon
Calcite geography Mineralization (geology) geography.geographical_feature_category General Engineering Geochemistry Mineralogy Structural basin Petroleum reservoir chemistry.chemical_compound chemistry Organic geochemistry General Materials Science Fluid inclusions Geothermal gradient Geology |
| Zdroj: | JOM. 50:30-34 |
| ISSN: | 1543-1851 1047-4838 |
| DOI: | 10.1007/s11837-998-0303-9 |
| Popis: | The Carlin-type disseminated gold orebodies of Yankee basin in the southern part of the Alligator Ridge mining district in Nevada contain widespread oil as smears, open-space fillings, and fluid inclusions in syn- and pre-mineral calcite veins. These unusual oils are the relicts of an exhumed and deeply oxidized oil reservoir that encom-passes the orebodies at the crest of a dissected, anticlinal trap. Results of fluid-inclusion microthermometry and organic geochemistry demonstrate that the oils experienced peak paleotemperatures of no more than about 150°C, a temperature unusually low for Carlin-type mineralization, but ideal for the transport, entrapment, and preservation of liquid hydrocarbon. Similar geothermal systems are actively circulating at three of Nevada’s producing oil fields—Grant Canyon, Bacon Flat, and Blackburn. Accordingly, concealed Carlin-type fossil hydrothermal systems of this type, even if subeconomic for gold, could contain commercial concentrations of oil. |
| Databáze: | OpenAIRE |
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