Lounejeva, E and Large, R and Danyushevsky, L and Mantle, D and Halpin, J and Goemann, K and Gilbert, S, Geochemical signature of PTB sediments in the Perth Basin reveals a toxic ocean at the end of Permian and anoxic ocean in Early Triassic, Goldschmidt 2014 Book of Abstracts, 8-13 June 2014, Sacramento, USA, pp. 1523. (2014) [Conference Extract]
Whole-rock paleo-redox indicators (Mn, P, Fe/Al and Mo/Al), change from low in Late Permian to high in Triassic, suggesting a change in oxygenation of bottom waters. This is in agreement with a larger diversity of sulphide minerals, including Cu-Zn-Cd phases, as well as the pyrite framboid size distribution suggesting anoxic-euxinic conditions for the postextinction Triassic Ca-enriched mudstones.
Euhedral pyrite from the PTB interface is distinguished by positive Bi-Te and delta34S anomalies.
The averaged trace elements composition of pyrite for the Phanerozoic, assessed by LA-ICPMS on over 3000 sedimentary pyrites, is proposed as a possible reference range of elemental abundance for normalization patterns for pyrite as an analogue of NASC for whole rock.
|Item Type:||Conference Extract|
|Keywords:||pyrite, palaeo-oceanography, seawater proxy|
|Research Division:||Earth Sciences|
|Research Field:||Structural geology and tectonics|
|Objective Division:||Expanding Knowledge|
|Objective Group:||Expanding knowledge|
|Objective Field:||Expanding knowledge in the earth sciences|
|UTAS Author:||Lounejeva, E (Ms Elena Lounejeva Baturina)|
|UTAS Author:||Large, R (Professor Ross Large)|
|UTAS Author:||Danyushevsky, L (Professor Leonid Danyushevsky)|
|UTAS Author:||Halpin, J (Dr Jacqueline Halpin)|
|UTAS Author:||Goemann, K (Dr Karsten Goemann)|
|UTAS Author:||Gilbert, S (Ms Sarah Gilbert)|
|Deposited By:||Centre for Ore Deposit Research - CODES CoE|
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