Geochemistry of hematite veins in IOA-IOCG deposits of SE Missouri, USA: Relation to felsic magmatism and caldera lakes

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Abstract

The paragenesis, textures, and chemical compositions of secondary hematite in regional potassic altered rhyolites, four IOA deposits, the sedimentary iron deposit at Pilot Knob and the Boss IOCG deposit in SE Missouri were determined and compared to primary magnetite from the IOA and IOCG deposits. Magnetite is composed of elements characteristics of mafic to intermediate intrusions whereas hematite is enriched in elements characteristic of felsic igneous rocks. These results suggest that magnetite formed from fluids discharged from mafic to intermediate composition intrusions. Hematite precipitated from fluids discharged from felsic intrusions or fluids that evolved in caldera lakes. Hematite in the sedimentary iron deposit at Pilot Knob formed in an evaporative caldera lake with fluid inputs from felsic intrusions.

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Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Geochemistry of hematite veins in IOA-IOCG deposits of SE Missouri, USA: Relation to felsic magmatism and caldera lakes
Volume 1
Year Published 2019
Language English
Publisher Society for Geology Applied to Mineral Deposits (SGA)
Contributing office(s) Central Mineral and Environmental Resources Science Center
Description 4 p.
Larger Work Type Book
Larger Work Subtype Conference publication
Larger Work Title Life with Ore Deposits on Earth – 15th SGA Biennial Meeting 2019
First page 392
Last page 395
Conference Title 15th SGA Biennial Meeting
Conference Location Glasgow, Scotland
Conference Date August 27-30, 2019
Country United States
State Missouri
Other Geospatial St Francois Mountains
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