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• W1981987779 abstract "The ordinary chondrites, Semarkona and Bishunpur, appear to have experienced in situ hydrous alteration. Here we report the results of the first detailed TEM examination of them, which supports this conclusion. In Semarkona, all but the most magnesian mafic minerals have been destroyed, and primary sulphides, most likely troilite, have been partially altered to phyllosilicates and Ni-rich pyrrhotite. In Bishunpur, alteration is confined to the production of smectite from an amorphous feldspathic material in the chondrule rims and interchondrule matrix. During hydrous alteration of both meteorites, the temperature probably did not exceed 260°C. The equilibrium composition of the gas present during the alteration of Semarkona was not solar but was dominated by H2O. The formation of smectite does not require the presence of liquid water. However, evidence for the redistribution of elements, such as Ca, Zn, and Si, over tens of microns or more implies that there was at least some transient grain-boundary fluid present. The alteration in Semarkona and Bishunpur is far from complete. Thermodynamic modelling suggests that more altered ordinary chondrites would be mineralogically similar to the CM and CI carbonaceous chondrites. Superficially, the mineralogy, mineral chemistry, and bulk chemistry of Semarkona matrix-rims resemble those of some chondritic interplanetary dust particles (CIDPs). The ordinary chondrite parent bodies may, therefore, be a source of some CIDPs." @default.
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• W1981987779 date "1989-11-01" @default.
• W1981987779 modified "2023-10-12" @default.
• W1981987779 title "The microstructure of Semarkona and Bishunpur" @default.
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• W1981987779 doi "https://doi.org/10.1016/0016-7037(89)90180-4" @default.
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