Geology of the Ketcherside Mountain area, southeastern Missouri, and the source of Grassy Mountain Ignimbrite

Sides, J. Ronald

doi:10.1130/0016-7606(1981)92<686:gotkma>2.0.co;2

Cited by 11 publications

(9 citation statements)

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“…The workings are small so it is doubtful that any signi cant production occurred. Brief accounts of geology and mineralization in the area include those by Sides (1981), Lowell et al (1986) and Noll et al (1998).…”

Section: Introductionmentioning

confidence: 99%

Fe-Cu-Au-bearing scapolite skarn in moat sediments of the Taum Sauk Caldera, southeastern Missouri, USA

Lowell

Noll

2001

Mineral. mag.

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Stromatolitic carbonate in moat-fill of a 1.48 Ga caldera was converted to mineralized calc-silicate skarn by interaction with magma-derived brine at Ketcherside Gap in southeastern Missouri. The skarnrecords early low fO2 conditions similar to those of reduced W and Au skarns. Initial skarn-forming conditions were: PL ≤ 221 bar (22.1 MPa), XCO2 ≤ 0.10, T = 450–;400°C, log fO2 ≈ –30, and log fS2 ≤ –13. Late skarn records combined effects of T↓, fO2↑,fS2↑, XCO2↓, and appearance of an immiscible CO2-rich vapour. The absence of a contact aureole indicates that skarn reactions were driven by advective heat transfer from an infiltrating fluid. Elsewhere in the region, hypersaline, synvolcanic fluids produced oxidized endoskarn in rhyolite. Development of carbonate-hosted, reduced skarn in caldera moat sediments is attributed to: (1) the nature of the host rock and reaction along a lengthy flow path; (2) early, but temporary, dilution of brine influx by CO2-producing reactions; and (3) cooling, possibly accompanied by increased brine influx with time.

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Section: Introductionmentioning

confidence: 99%

Fe-Cu-Au-bearing scapolite skarn in moat sediments of the Taum Sauk Caldera, southeastern Missouri, USA

Lowell

Noll

2001

Mineral. mag.

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“…The trachytic rocks, on the other hand, are related to tension fractures and caldera collapse structures ; this study). Stromatolitic limestones, volcaniclastic rocks, hematitic iron formations, volcanic breccias, and minor volcanic rocks also are related to caldera collapse (Stinchcomb, 1976;Sides, 1981;Sides and others, 1981; this study).…”

Section: Missourimentioning

confidence: 99%

“…The hot-spring origin for this deposit is further supported by interlayering of waterlaid tuffs, stromatolitic limestone, and fine-banded hematitic layers at the Cuthbertson Mountain manganese deposit south of Pilot Knob (Stinchcomb, 1976; this study). Other tuffaceous sedimentary rocks± hematite± copper± gold± silver are at Ketcherside Gap southwest of Cuthbertson Mountain (Stinchcomb, 1976;Sides, 1981; this study). Sides (1981) noted that all of these bedded volcaniclastic sedimentary rocks lie along or near proposed ring faults of a caldera.…”

Section: Iron Deposits Of Missourimentioning

confidence: 99%

“…Other tuffaceous sedimentary rocks± hematite± copper± gold± silver are at Ketcherside Gap southwest of Cuthbertson Mountain (Stinchcomb, 1976;Sides, 1981; this study). Sides (1981) noted that all of these bedded volcaniclastic sedimentary rocks lie along or near proposed ring faults of a caldera.…”

Section: Iron Deposits Of Missourimentioning

confidence: 99%

“…It is not known whether trachytic rocks occur within the mine. As in some of the Kiruna orebodies, five distinct ore zones occur within the Pea Ridge orebody: (1) magnetite±apatite±monazite±fluorite± barite±calcite±quartz±pyrite, (2) specular hematite, (3) quartz-hematite ± fluorite ±barite ± molybdenite± tourmaline, ( 4) quartz-amphibole, and (5) Compiled from , ), Panna (1978, Sides (1981), Sides and others (1981), Panna and Hood (1983), and this study.…”

Section: Iron Deposits Of Missourimentioning

confidence: 99%

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Geology of the Ketcherside Mountain area, southeastern Missouri, and the source of Grassy Mountain Ignimbrite

Cited by 11 publications

References 0 publications

Fe-Cu-Au-bearing scapolite skarn in moat sediments of the Taum Sauk Caldera, southeastern Missouri, USA

Fe-Cu-Au-bearing scapolite skarn in moat sediments of the Taum Sauk Caldera, southeastern Missouri, USA

The Midcontinent of the United States: Permissive terrane for an Olympic dam-type deposit?

Calderasin The Precambriante Rrane of the ST. Francois Mountains, Southeastern Missouri

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