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Influence of organic matter on smectite illitization: A comparison between red and dark mudstones from the Dongying Depression, China by Li, Yingli; Cai, Jingong; Song, Mingshui; Ji, Junfeng; Bao, Yujin is a Earth and Planetary Sciences article available to read on EtoBox.

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Interactions between organic matter (OM) and clay minerals have received considerable attention in previous studies. The influence of OM on smectite illitization has been analyzed primarily in simulation experiments rather than in diagenetic studies. The present study explores the influence of OM on smectite illitization during diagenesis. Thirty red and dark mudstone samples from the Dongying Depression were analyzed. X-ray diffraction (XRD) analyses revealed that the illite percentages in mixed-layer illite-smectite (I-S) of both types of samples were dispersive above 3100 m and more convergent below this depth. The stacking mode of I-S in dark mudstones above 3100 m remained primarily at R0-R0.5 ordering with the average number of layers (N ave ) dispersively distributed between 2 and 4.5. In red mudstones, the I-S changed from the R0 to R0.5 mode with the N ave increasing from 2 to 5. Over this range, the smectite illitization in dark mudstones was slower than that in red mudstones. Below 3100 m, the I-S stacking mode of dark mudstones changed from R0.5 to R3 ordering with the N ave increasing sharply from 4 to 8. In red mudstones, the I-S displayed R1.5 and R3 ordering with th

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Author

Li, Yingli; Cai, Jingong; Song, Mingshui; Ji, Junfeng; Bao, Yujin

Publisher

Mineralogical Society of America; Walter de Gruyter GmbH (ISSN 0003-004X)

Published

2016

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)