Oxic to anoxic transition in bottom waters during formation of the Citronen Fjord sediment-hosted Zn-Pb deposit, North Greenland

J Slack, D. Rosa, H. Falck

Publikation: Bidrag til bog/rapport/konferenceproceedingsAbstract i proceedingspeer review

Abstrakt

Bulk geochemical data acquired for hostsedimentary rocks to the Late Ordovician Citronen Fjord sediment-hosted Zn-Pb deposit in North Greenland constrain the redox state of bottom waters prior to and during sulphide mineralization. Downhole profiles for one drill core show trends for redox proxies (MnO, Mo, Ce anomalies) that suggest the local basin bottom waters were initially oxic, changing to anoxic and locally sulphidic concurrent with sulphide mineralization. We propose that this major redox change was caused by two broadly coeval processes (1) emplacement of debris-flow conglomerates that sealed off the basin from oxic seawater, and (2) venting of reduced hydrothermal fluids into the basin. Both processes may have increased H2S in bottom waters and thus prevented the oxidation of sulphides on the sea floor.
OriginalsprogEngelsk
TitelProceedings of the 13th biennial meeting of the Society for Geology Applied to Mineral Deposits
UdgivelsesstedNancy
ForlagSociety for Geology Applied to Mineral Deposits (SGA)
Sider2013-2016
Vol/bind5
StatusUdgivet - 2015
Begivenhed13th biennial meeting of the Society for Geology Applied to Mineral Deposits - Nancy, France
Varighed: 1 jan. 2015 → …

Konference

Konference13th biennial meeting of the Society for Geology Applied to Mineral Deposits
ByNancy, France
Periode1/01/15 → …

Programområde

  • Programområde 4: Mineralske råstoffer

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