Summary statement
This paper investigates the formation process of iron minerals in red
oolitic grainstones of the Lower Jurassic Nieniexiongla Formation,
demonstrates organomineralization of sulfate-reducing bacteria mediated
pyrites in carbonate ooids. We propose that sulfate-reducing bacteria
would utilize organic matter within ooids after sedimentation, resulting
changes in the mineral composition of ooids.
Keywords : Ooidal limestone; Pyrite; Hematitization;
Organomineralization; Lower Jurassic Nieniexiongla Formation; Southern
Tibet