Origin of Amphibolites in the Beartooth Mountains, Wyoming and Montana: New Data and Interpretation

Autor:	P. C. van De Kamp
Rok vydání:	1969
Předmět:	Igneous rock Ultramafic rock Earth science Metamorphic rock Geochemistry Sediment Geology Compositional variation Interpretation (model theory)
Zdroj:	Geological Society of America Bulletin. 80:1127
ISSN:	0016-7606
DOI:	10.1130/0016-7606(1969)80[1127:ooaitb]2.0.co;2
Popis:	Nine new chemical analyses of supposed para-amphibolites from the southern Bear-tooth Mountains are used with previous data to show that these rocks were derived from basic igneous rocks rather than clastic-carbonate sediment mixtures. Trends of chemical variation, rubidium-strontium and lanthanum-cerium ratios suggest a metaigneous origin. Banding in the amphibolites is due to metamorphic differentation. Two analyses of ultrabasic rocks are also presented.
Databáze:	OpenAIRE
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