Iron availability as a dominant control on the primary composition and diagenetic overprint of organic-matter-rich rocks
Review articleOpen access

Highlights•We study mudstone geochemistry in marine ramp setting.•Enrichment in Fe, P, Mo, As and Sb, excluding U may be a proxy to iron shuttle.•Limitation in reactive iron increases sulfurization-induced protection of OM.•It may be also the case for marine environments with no strong productivity•Iron supply is a key factor for (in-)organic geochemistry of margin sediments.

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