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- W1521773360 abstract "Scanning electron microscope (SEM) examination of a shale unit from the Newland Formation reveals textural features that are beyond the resolution of the petrographic microscope. For example, seemingly homogenous appearing layers of shale may actually be composed of interbedded laminae of aligned vs randomly oriented clay minerals, indicating a more complex depositional history. Another interesting feature are shale intraclasts (0.02--0.05 mm in size) within shale beds. Differential compaction around these intraclasts and unabraded corners suggest that these were hardened at time of deposition and were not transported very far. These observations suggest erosion of dried out mud crusts and redeposition of fragments thereof. In general the microfabrics show a moderate to low degree of clay mineral alignment. In part this can be ascribed to differential compaction around silt grains, but there is also evidence for an original lack of preferred orientation or parallel to lamination, show in many instances random orientation. At higher magnification one can see domains of randomly oriented clay minerals with edge to face and edge to edge contacts. These textures are typical for flocculated clays. Above observations suggest deposition of these shale in fairly shallow water, nearshore mixing of terrestrial waters with saline basinal waters, andmore » fluctuating energy levels (episodic wave reworking, tides ). This compares well with previous assessments of the depositional environment of this shale unit and suggests that despite diagenetic modifications, microfabric features of shales can be useful environmental indicators.« less" @default.
- W1521773360 created "2016-06-24" @default.
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- W1521773360 date "1993-02-01" @default.
- W1521773360 modified "2023-09-28" @default.
- W1521773360 title "Relationship of depositional environment to microfabric features of a shale unit in the mid-Proterozoic Newland Formation, Montana" @default.
- W1521773360 hasPublicationYear "1993" @default.
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