Glaucophane-bearing metamorphic rock types of the cazadero area, California

86Citations
Citations of this article
8Readers
Mendeley users who have this article in their library.
Get full text

Abstract

A detailed field and laboratory study has been made of a well-exposed glaucophane schist sequence within the Jurassic and Cretaceous Franciscan Formation of northern California. Three types of glaucophane-bearing metamorphic rocks have been distinguished in and around the area of the detailed study. Each is characterized by distinctive textures and mineral assemblages that are interpreted to represent different grades of metamorphism within the glaucophane schist facies.From the combination of small- and large-scale mapping in the area described it is clear that coarsely schistose blocks, tens of feet in diameter, commonly rest directly upon and within less intensely metamorphosed terrain. In the Cazadero area these isolated blocks of coarsely crystalline rocks are concentrated in a band that is roughly concordant with some of the major faulting, and their metamorphic fabric shows no consistent relation to local or regional structures. It is tentatively suggested that these blocks have been transported upward tectonically and that they are not stratigraphically equivalent to the other types of glaucophane-bearing metamorphic rocks in the area.Chemical and petrographic evidence indicates that basalt and sediments have been converted to glaucophane-bearing rocks under conditions of metamorphism that were essentially isochemical, except for fugitive components and some minor elements. © 1963 Oxford University Press.

Cite

CITATION STYLE

APA

Coleman, R. G., & Lee, D. E. (1963). Glaucophane-bearing metamorphic rock types of the cazadero area, California. Journal of Petrology, 4(2), 260–301. https://doi.org/10.1093/petrology/4.2.260

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free