| Autor: |
Frederick M. Haynes, Stephen E. Kesler |
| Rok vydání: |
1987 |
| Předmět: |
|
| Zdroj: |
Applied Geochemistry. 2:321-327 |
| ISSN: |
0883-2927 |
| DOI: |
10.1016/0883-2927(87)90047-3 |
| Popis: |
Scanning electron microscopy and energy dispersive analysis of fluid inclusion decrepitates in sparry dolomite cements associated with sphalerite mineralization in the Mascot-Jefferson City Missis- sippi Valley-type district of East Tennessee show a markedly lower NaJCa ratio than those in dolomites unassociated with ore. The exploration potential of this variation in fluid inclusion chemistry has been evaluated by analyzing inclusion decrepitates from white sparry dolomite along a 150 m traverse in the New Market West mine area. The traverse extends from the central portion of a large domal collapse- breccia orebody with greater than 3% Zn, into the dolomite-veined, but unmineralized Knox Group limestones. Ratios of Na/Ca as low as 0.8--1.2 were common in dolomite-hosted decrepitates from the high-grade collapse ores. This anomalous decrepitate chemistry was not observed in sparry dolomites less than 12 m from the margins of the breccia bodies where Na/Ca ratios ranged from 1.8 to 3.6. Dolomite cements in IDly grade ( |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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