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Relict fracture cleavage in paraschists

Stark, J. T. and Maxson, J. H. (1939) Relict fracture cleavage in paraschists. Geological Society of America Bulletin, 50 (10). pp. 1529-1534. ISSN 0016-7606. doi:10.1130/gsab-50-1529.

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To the commonly known criteria suggesting that metamorphosed rocks were originally sedimentary may be added relict fracture cleavage, when confined to certain thin beds. Thin beds in the Archean Vishnu series of the Grand Canyon possess cross structures at high angles to their bounding surfaces. These transverse planes presumably were developed in incompetent layers during crustal deformation. Later they became the loci of biotite crystallization and thus were preserved. Close folding of parts of the Vishnu series on Vishnu Creek indicated by reversals in attitude of fracture cleavages is corroborated by the testimony of drag folds.

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Additional Information:© 1939 Geological Society of America. Manuscript received by the Secretary of the Society, January 13, 1939. Presented before the Geological Society, December 28, 1938.
Issue or Number:10
Record Number:CaltechAUTHORS:20210716-155424814
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Official Citation:J. T. Stark, J. H. Maxson; Relict fracture cleavage in paraschists. GSA Bulletin 1939; 50 (10): 1529–1534. doi:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109866
Deposited By: Tony Diaz
Deposited On:16 Jul 2021 16:00
Last Modified:16 Nov 2021 19:38

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