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Occurrence of anatase in reworking altered ash beds (K-bentonites and tonsteins) and discrimination of source magmas: a case study of terrestrial Permian–Triassic boundary successions in China

Published online by Cambridge University Press:  20 January 2021

Hanlie Hong*
Affiliation:
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, Hubei430074, China School of Earth Sciences, China University of Geosciences, Wuhan430074, China
Xiaoxue Jin
Affiliation:
School of Earth Sciences, China University of Geosciences, Wuhan430074, China
Miao Wan
Affiliation:
School of Mathematics and Physics, China University of Geosciences, Wuhan, Hubei430074, China
Kaipeng Ji
Affiliation:
School of Earth Sciences, China University of Geosciences, Wuhan430074, China
Chen Liu
Affiliation:
School of Earth Sciences, China University of Geosciences, Wuhan430074, China
Thomas J. Algeo
Affiliation:
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, Hubei430074, China State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, Hubei430074, China Department of Geology, University of Cincinnati, Cincinnati, OH45221-0013, USA
Qian Fang
Affiliation:
School of Earth Sciences, China University of Geosciences, Wuhan430074, China

Abstract

Potential secondary influences on titanium distribution should be evaluated when using ash beds as volcanic source indicators and for correlation purposes. In this study, well-correlated altered ash beds in Permian–Triassic boundary (PTB) successions of various facies in South China were investigated to better understand their use in source discrimination and stratigraphic correlation. The ash beds deposited in lacustrine and paludal facies contain significantly more Ti relative to deposits in marine facies. Neoformed anatase grains nanometres to micrometres in size are associated closely with clay minerals, whereas detrital anatase was observed in the remnants of altered ash beds of terrestrial facies. Extraction of the clay fraction of altered ash beds may exclude significantly detrital accessory minerals such as anatase and rutile added during sediment reworking, and the concentrations of immobile elements in the clay fraction may therefore be used to interpret more effectively their source igneous rocks.

Type
Article
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

Associate Editor: Martine Buatier

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