Basalt intrusions in evaporites by Bernhard J. Knipping, Ralph B. Phillips PDF

By Bernhard J. Knipping, Ralph B. Phillips

ISBN-10: 0387513086

ISBN-13: 9780387513089

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In fig. 7 it is clear that the phonolitic tephrite (dike ) contains distinctly greater amounts of lanthanides than sample 46/87, which was assigned to dike due to its mineral constituents.

Sulfur Since native sulfur was not observed in any of the basalt thin sections, it must be disseminated through the silicate rock in submicroscopic phases. , outcrop 8-ug) are only local accumulations. Evidence of the presence of further basalt occurrences in the Werra mining district was provided by extensive AT measurements at the surface with a protOn magnetometer (StaMeNS 1971). The results show that dike (normal magnetization) possibly extends to the quarry near Friedewald (outcrop 46-sf).

In this case the rock consists of fine, flow-oriented plagioclase and sanidine crystals, nepheline, opaque minerals, and glass. The subsurface samples additionally contained haliteand carbonate-filled amygdules. In these samples sanidine can hardly be distinguished from plagioclase since it rarely occurs as larger individual plates. In contrast, the phonolitic tephrite from outcrop 33-ug has an ophitic, intersertal texture. Chaotically oriented, inclusion-rich plagioclase together with sanidine and nepheline overgrow skeletal to i~'omorphic hornblende crystals.

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Basalt intrusions in evaporites by Bernhard J. Knipping, Ralph B. Phillips

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