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- W289237802 abstract "Early diagenetic alunite group mineral cements and grain alteration products have been identified within the Camp Rice axial-fluvial facies west of Las Cruces, New Mexico. These constituents are pervasive and occur as pore occluding aggregates of euhedral crystals 5--15 [mu]m in diameter or as a finely disseminated mix with other authigenic minerals and alteration products. Approximately 19% of the total alunite is intragranular and replaces primarily volcanic rock fragments and feldspars. The diagenetic event was highly destructive to the original detrital constituents. An inferred initial average composition of Q[sub 47]F[sub 21]I[sub 32] from well indurated adjacent, calcite cemented strata of similar grain size has been altered to a composition of Q[sub 59]F[sub 20]L[sub 21]. Individual sandstone bodies exhibit a vertical zonation of cements from a lower alunite-natroalunite-gypsum assemblage to an overlying jarosite-kaolinite-silica assemblage. Jarosite-dominated strata are distinctly better indurated along the foresets and bases of individual cross-bed sets than alunite-dominated strata suggesting preferential precipitation of the former within initially higher permeability zones. The alunite group mineral constituents are believed to have developed under acidic and oxidizing conditions in a nearsurface environment. Jarosite likely formed under more acidic and oxidizing conditions than the alunite. Ascending hydrothermal waters rich in H[sub 2]Smore » provided the necessary sulfate. The hydrothermal waters may have already been acidic or were acidified by the oxidation of H[sub 2]S. Descending oxidized meteoric waters flowing along permeable conduits and mixing with the hydrothermal waters likely controlled Eh and therefore pH of the diagenetic environment. Many of the necessary cations for alunite and jarosite genesis probably resulted from local hydrolysis of feldspars and volcanic rock fragments.« less" @default.
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- W289237802 date "1992-01-01" @default.
- W289237802 modified "2023-09-27" @default.
- W289237802 title "Early diagenetic alunite group mineral cements and alteration products of the Camp Rice Formation (Plio-Pleistocene) southern Rio Grande Rift" @default.
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