Naturally occurring microbially-induced smectite-to-illite reaction


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Susann.Henkel [ at ] awi.de

Abstract

The occurrence of microbially induced smectite-to-illite (S-I) reaction has challenged both the notions of solely inorganic chemical control for this reaction and the conventional concept of a semiquantitative illite geothermometer for the reconstruction of the thermal and tectonic histories of sedimentary basins. Here, we present evidence for a naturally occurring microbially induced S-I transition, via biotic reduction of phyllosilicate structural Fe(III), in mudstones buried at the Nankai Trough, offshore Japan (International Ocean Discovery Program Site C0023). Biotic S-I reaction is a consequence of a bacterial survival and growth strategy at diagenetic temperatures up to 80 °C within the Nankai Trough mudstones. These results have considerable implications for petroleum exploration, modification of fault behavior, and the understanding of microbial communities in the deep biosphere.



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ISI/Scopus peer-reviewed
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Published
Eprint ID
49381
DOI 10.1130/G46122.1

Cite as
Kim, J. , Dong, H. , Yang, K. , Park, H. , Elliott, C. W. , Spivack, A. , Koo, T. h. , Kim, G. , Morono, Y. , Henkel, S. , Inagaki, F. , Zeng, Q. , Hoshino, T. and Heuer, V. B. (2019): Naturally occurring microbially-induced smectite-to-illite reaction , Geology . doi: 10.1130/G46122.1


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