Are the granitic rocks of the Salinian block trondhjemitic?

Journal of Research of the U.S. Geological Survey
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Abstract

Trondhjemitic rocks are relatively abundant in the granitic terranes of the western Sierra Nevada and the Klamath Mountains but have not been found in the granitic plutons of the Salinian block, which lies westward, across the San Andreas fault. A ternary plot of modal quartz : K-feldspar : plagioclase from more than 200 granitic samples from the Salinian block has an elongate, nearly horizontal, quartz-rich trend that appears trondhjemitic to some observers. However, petrographic and chemical comparison of these rocks with trondhjemite from the type area in Norway and with rocks called trondhjemite in the Western United States shows that the granitic rocks of the Salinian block are not trondhjemitic. The absence of trondhjemite in the Salinian block further supports the contention that this terrane is not merely a westward continuation of Sierran basement but is a displaced basement block.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Are the granitic rocks of the Salinian block trondhjemitic?
Series title Journal of Research of the U.S. Geological Survey
Volume 1
Issue 3
Year Published 1973
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Description 4 p.
First page 251
Last page 254
Country United States of America
State California
Online Only (Y/N) N
Additional Online Files (Y/N) N
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