Early rift history of the proto-Atlantic Ocean; geochemical evidence from metavolcanic rocks in Vermont

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Authors:Coish, R. A.; Fleming, F. S.; Larsen, M.; Poyner, R.; Seibert, J.
Author Affiliations:Primary:
Middlebury Coll., Geol. Dep., Middlebury, VT, United States
Volume Title:American Journal of Science
Source:American Journal of Science, 285(4), p.351-378. Publisher: Kline Geology Laboratory, Yale University, New Haven, CT, United States. ISSN: 0002-9599
Publication Date:1985
Note:In English. 61 refs.; illus. incl. 3 tables, geol. sketch maps
Summary:Two distinct chemical groups are recognized in greenstones of the Camel's Hump group from four localities in W Vermont. Results of a reconnaissance geochemical survey are reported in tables and diagrams. The chemical data and field relationships support the conclusion that differences between the two groups are due to derivation from separate melts by different degrees of melting of the mantle at different depths. REE patterns and other chemical criteria are consistent with interpretation of the one group as having formed in an intra-continental rift environment and origin of the rocks of the other groups as continental tholeiites. [M.S.]
Subjects:Cambrian; Geochemistry; Greenstone; Iapetus; Lower Cambrian; Major elements; Metals; Metamorphic rocks; Metavolcanic rocks; Neoproterozoic; Paleozoic; Pinnacle Formation; Pinney Hollow Formation; Plate tectonics; Precambrian; Proterozoic; Rare earths; Rifting; Schists; Tectonophysics; Trace elements; Underhill Formation; Upper Precambrian; Atlantic region; Franklin County Vermont; United States; Vermont; Camels Hump Group; Gillett Pond; Hancock; Huntington; Tibbit Hill; Wintergreen Mountain
Coordinates:N440000 N450000 W0723000 W0731500
Abstract Numbers:87M/1052
Record ID:1985046718
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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