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Randomly interstratified serpentine-chlorite (Sp-Ch) is ubiquitous in sandstones of the subsurface Tuscaloosa Formation. The Sp-Ch occurs as grain coatings, pore fillings, pel- oids, and infillings. The presence of peloids and infillings suggests that the Sp-Ch originated as odinite, a 7 Å mineral that forms at the sediment-seawater interface in shallow, tropical marine sediments. We conclude that during the very earliest stages of diagenesis, odinite peloids and infillings transformed to mixed-layer Sp-Ch, forming grain coatings with pres­ervation of some of the original odinite textures. The formation of grain-coating Sp-Ch during early diagenesis apparently preserved high primary porosity in medium-grained specimens. Fine-grained and silty sandstones, however, contain poorly formed grain coatings and are tightly cemented by quartz, implying that grain size also has some effect on authigenic quartz growth.

The origin and diagenesis of grain-coating serpentine-chlorite in Tuscaloosa Formation sandstone, U.S. Gulf Coast