A hydrogen sulfide, basinal-degassing model for the origin of Mississippi Valley-type ore deposits
Conference
·
· Geological Society of America, Abstracts with Programs; (United States)
OSTI ID:5011642
- Hill (Carol A.), Albuquerque, NM (United States)
A model is proposed whereby H[sub 2]S degassing from hydrocarbon-evaporite basins mixes with metal-chloride complexes in carbonate margins to form Mississippi Valley-type (MVT) ore deposits. This model has many advantages over a non-mixing model for the origin of MVTs. It helps to explain: (1) why MVTs form in carbonate rock around the margins of basins, (2) why MVTs form in non-tectonic areas, (3) why MVTs are areally extensive, (4) why barren areas occur within major MVT deposits, (5) why MVTs are concentrated in structural and stratigraphic traps, (6) why the timing of MVTs is often subsequent to basinal dewatering or compaction, (7) why hydrocarbon inclusions are often found in MVTs, (8) why [delta][sup 34]S values of MVTs vary substantially within different deposits, (9) why MVTs are usually associated with karst, (10) why MVT crystals are zoned and etched, and (11) why native sulfur rarely exists with MVTs. It less readily explains (1) fluid inclusion temperatures and salinities, (2) the source of metals, and (3) the distribution of sulfide minerals. It is proposed that MVT ore deposits are the result of the degassing of basins, not the compaction or dewatering of basins. This model is based on work done in the Delaware Basin and should be tested in other intracratonic basins.
- OSTI ID:
- 5011642
- Report Number(s):
- CONF-9303210--
- Conference Information:
- Journal Name: Geological Society of America, Abstracts with Programs; (United States) Journal Volume: 25:3
- Country of Publication:
- United States
- Language:
- English
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Journal Article
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Tue Jan 31 23:00:00 EST 1995
· Environmental Geology (New York)
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OSTI ID:61805