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- W262072641 abstract "Illite-like grains in hydrothermally altered Eocene sandstones from Kettleman North Dome in the San Joaquin Valley, CA have been characterized by electron microscopy to investigate the cause of the low-K contents obtained in previous electron microprobe analyses that were inferred to represent true hydromuscovite-hydropyrophyllite solid solutions and to conclude that illite may be a stable phase. The illite-like grains are of two types: (1) curved, flaky grains that fill pore space in fractured K-feldspar and along grain boundaries between K-feldspar and quartz, and (2) aggregates of lath-like grains that fill cavities. EDS analyses show that the former has an illite-like composition of 0.7--0.8 K per O[sub 10](OH)[sub 2] and the latter is muscovite. Electron diffraction and lattice-fringe images show that the first type of grains is rectorite-like R1 illite/smectite (I/S). Both the R1 I/S and muscovite are interlayered with and/or irregularly embayed by kaolinite, implying that they may have been partially replaced by kaolinite or vice versa. Aggregates of randomly oriented, very fine-grained R1 I/S and kaolinite that formed as cements are abundant. It is not possible to define individual single-phase grains in any of these types of mixtures with optical microscopy. Analyses of such mixtures have low K contentsmore » and high Al/Si ratios. The data demonstrate that the previously-reported low-K, hydronium-rich phases that were implied to represent hydromuscovite-hydropyrophyllite solid solutions do not exist. There is no evidence for the presence of interlayer H[sub 2]O and H[sub 3]O[sup +] that were hypothesized to stabilize illite. Common illite is thus a K-deficient, Si-rich dioctahedral mica with composition that is approximately intermediate to those of pyrophyllite and muscovite and within the pyrophyllite-muscovite solvus. It is therefore metastable with respect to muscovite + pyrophyllite.« less" @default.
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- W262072641 date "1992-01-01" @default.
- W262072641 modified "2023-09-23" @default.
- W262072641 title "Muscovite- and R1 illite/smectite-kaolinite intergrowths in the Eocene McAdams Sandstone: Non-existence of hydromuscovite and implications for illite metastability" @default.
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