Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5783324 | Geochimica et Cosmochimica Acta | 2017 | 77 Pages |
Abstract
Higher fluxes of meteoric water in the Miocene summers would have facilitated dissolution and removal of BIF-sourced silica with concomitant enrichment in oxidized Fe. Moreover, wetter late Miocene summers could have promoted multiple cycles of microbially mediated dissolution and recrystallization of Fe(III) oxides in the aerobic systems. The oolitic textures may be indicative of such recycling. However, the oolitic goethites of Mesa J were closed systems after â¼7Â Ma. Therefore, the climate in the vicinity of Mesa J seems to have changed in the late Miocene to conditions that did not favor widespread recycling of Fe (III) oxides-perhaps changing from seasonally wet to the modern dry climate.
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Authors
Crayton J. Yapp, David L. Shuster,