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- W252675342 abstract "Chemical and mineralogical trends in the weathering of an outcrop of Precambrian olivine diabase were analyzed. The outcrop core of fresh rock is surrounded by concentric shells of weathered materials extending to a maroon saprolitic soil. Regionally, the weathered surface is overlain by Upper Cambrian sediments. At this outcrop the gabbro and its weathering zones are truncated by a modern soil profile. Analytical methods included: bulk chemical and trace element analyses, XRD, TGA and bioptical microscope inspection. Mineral alteration initiated with the formation of chlorite and limonite from mafic minerals. Then, plagioclase altered to montmorillonite as chloritization continued. In the final stage of weathering chlorite and limonite changed to hematite, montmorillonite diminished and an amorphous ( ) mineral developed. Chemical changes included decreases in FeO, CaO, MgO, and Na[sub 2]O and an increase in Fe[sub 2]O[sub 3]. Al[sub 2]O[sub 3] and SiO[sub 2] remained constant. K[sub 2]O was enhanced in late weathering stages, possibly introduced from the weathering of nearby felsic rock. LOI increased initially, then remained constant. Sr, Ba, and Zn were depleted and Zr and Y were enhanced. Sc, Ni, and V remain constant. Cu was enhanced in intermediate stages, then was depleted. Indices of chemical weathering frommore » the literature were evaluated and the results were inconclusive. Instead, indicative trends correlative with progressive weathering are: (1) increasing Fe[sub 2]O[sub 3]/(FeO + Fe[sub 2]O[sub 3]) and (2) decreasing MgO.« less" @default.
- W252675342 created "2016-06-24" @default.
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- W252675342 date "1993-03-01" @default.
- W252675342 modified "2023-09-23" @default.
- W252675342 title "Chemical and mineralogical changes in the Late Precambrian to Cambrian weathering of a diabase knob, St Francois Mountains, Missouri" @default.
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