Fluid-inclusion studies of regionally extensive epigenetic dolomites, Bonneterre Dolomite (Cambrian), southeast Missouri: Evidence of multiple fluids during dolomitization and lead-zinc mineralization

Shelton, Kevin L.; Bauer, Rita M.; Gregg, Jay M.

doi:10.1130/0016-7606(1992)104<0675:fisore>2.3.co;2

Cited by 66 publications

(31 citation statements)

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“…Hence, MVT ore-stage fluid data are characterized by relatively restricted temperature and salinity characteristics. It should be noted that the mean temperatures of ore-stage fluids calculated in this paper from the Viburnum Trend (110°C) and the Tri-State district (111°C) are very similar to equivalent values of 108°C and 107°C, respectively, calculated by Shelton et al (1993aShelton et al ( , 1993b.…”

Section: Temperature -Salinity Fluid Datamentioning

confidence: 52%

A Review of Fluid Inclusion Temperatures and Salinities in Mississippi Valley-type Zn-Pb Deposits: Identifying Thresholds for Metal Transport

Basuki

Spooner

2002

Exploration and Mining Geology

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More than 2800 published fluid inclusion data (primary inclusions) from eighteen typical Mississippi Valley-type (MVT) Zn-Pb deposits and districts were examined to study possible relationships between MVT fluid properties and metal tonnages and ore grades. The mean Th and salinity values for fifteen MVT deposits and districts are 122°C ± 21°C and 20.7 ± 2.6 wt% CaCl2 equivalent, respectively. In general, temperatures increase from pre-ore to ore stages, and salinities decrease from ore to post-ore stages. From post-ore to late calcite stages, salinity and temperature decrease with various trends within specific districts.Several conclusions are drawn: first, results show that Hanor's (1996) salinity threshold for metalrich basinal fluids applies to typical MVT ore fluids (~16 wt% CaCl2 equivalent). Second, the lower limit of mean Th values of measured MVT deposits and districts (n = 15) of ~75°C is similar to Hanor's (1996) observed temperature threshold for metal-rich basinal brines of ~60°C (n = 224). Third, there is no statistically significant relationship between fluid inclusion homogenization temperatures (Th) and metal tonnages or ore grades. Fourth, there seems to be a tendency for large tonnage districts/deposits to be associated with mean fluid salinities that are relatively low (~16 to 21 wt% CaCl2 equivalent) within the overall range of salinity means (~16 to 26 wt% CaCl2 equivalent). There is also a correlation between higher ore grades and higher salinities. Finally, comparison with other sedimentary rock-hosted Zn-Pb deposit types shows a trend of salinity decrease and temperature increase from MVT, sandstone-hosted and diapir-related Pb-Zn deposits, to vein-type and Irishtype Pb-Zn deposits, and then to sedex deposits. However, more data are needed for sedex deposits. The salinity threshold for significant Zn-Pb transport decreases to ≤~10 wt% CaCl2 equivalent at 250°C. This study suggests that fluid inclusion analysis during exploration may be useful in assessing ore-forming potential (threshold salinity) and possible ore grades (salinity).

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Section: Temperature -Salinity Fluid Datamentioning

confidence: 52%

A Review of Fluid Inclusion Temperatures and Salinities in Mississippi Valley-type Zn-Pb Deposits: Identifying Thresholds for Metal Transport

Basuki

Spooner

2002

Exploration and Mining Geology

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“…Many Ordovician-hosted HTD fields in southwestern Ontario, Michigan, and Ohio are located oblique to the flanks of these highs (for example, Figure 19). Basement highs also influenced the localization of the Cambrian Viburnum MVT trend in southeastern Missouri (Shelton et al, 1992) and the Irish-type MVT and associated dolomite in the Mississippian of Ireland (Hitzman and Beaty, 1996). In western Canada, the Peace River arch (Figure 1) localized hydrothermal dolomitization in the Devonian Slave Point (including Ladyfern field) and Wabamun formations.…”

Section: Function Of Basement Highsmentioning

confidence: 97%

“…Where sandstone aquifers pinch out at flanks of basement highs (Figure 20), this boundary commonly is the lateral limit of upward, structurally controlled hydrothermal fluid flow and consequent mineralization (MVT) and dolomitization (for example, Shelton et al, 1992;Hitzman and Beaty, 1996;Colquhoun and Trevail, 2000). Basal Cambrian sandstones directly overlying eroded, weathered, and commonly fractured basement rocks contribute to hydrothermal flow systems and HTD emplacement into Ordovician hosts in the Michigan (Colquhoun and Trevail, 2000) and Appalachian basins and elsewhere (Table 3).…”

Section: Function Of Sandstone Aquifersmentioning

confidence: 98%

Structurally controlled hydrothermal dolomite reservoir facies: An overview

Davies¹,

2006

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“…The spatial relationship between regional dolomitization and mineralization in southeast Missouri is straightforward (Figs. 1, 4); however, the paragenesis of the dolomite itself is considerably more complex, as several episodes of dolomitization have been suggested (e.g., Gregg and Shelton, 1989;Shelton et al, 1992;Gregg et al, 1993;Hagni, 1995).…”

Section: Bonneterre Formationmentioning

confidence: 97%

Dolomite Fronts and Associated Zinc-Lead Mineralization, Usa

Harper¹,

Borrok²

2007

Economic Geology

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This paper provides previously unpublished drill core and mapping evidence of the spatial relationship between regional dolomitization and Mississippi Valley-type (MVT) mineralization in the midcontinent of the United States. Dolomitization is discussed for several key carbonate units and their contained MVT mineralization. This more complete picture of the relationship between regional dolomitization and mineralization provides constraints on models for MVT mineralization and serves as an exploration guide for new deposits.

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Fluid-inclusion studies of regionally extensive epigenetic dolomites, Bonneterre Dolomite (Cambrian), southeast Missouri: Evidence of multiple fluids during dolomitization and lead-zinc mineralization

Cited by 66 publications

References 0 publications

A Review of Fluid Inclusion Temperatures and Salinities in Mississippi Valley-type Zn-Pb Deposits: Identifying Thresholds for Metal Transport

A Review of Fluid Inclusion Temperatures and Salinities in Mississippi Valley-type Zn-Pb Deposits: Identifying Thresholds for Metal Transport

Structurally controlled hydrothermal dolomite reservoir facies: An overview

Dolomite Fronts and Associated Zinc-Lead Mineralization, Usa

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