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Deposition of Franciscan Complex cherts along the paleoequator and accretion to the American margin at tropical paleolatitudes

Geological Society of America Bulletin

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Abstract

Red radiolarian cherts from three localities within the Franciscan subduction complex of northern California contain three components of remanent magnetization which are best isolated by progressive thermal demagnetization. The available paleomagnetic, biostratigraphic, and geochemical data indicate deposition of these cherts along the paleoequator (0??-2??N or S paleolatitude) between Pliensbachian and Oxfordian time as the oceanic plate moved eastward, relative to North America, beneath the equatorial zone of high biologic productivity. The chert sequences were subsequently accreted to the American continental margin. Plate reconstruction models for the Farallon plate corrobotate low-paleolatitude trajectories from ridge crest to subduction zone, and they imply subsequent northward translation of the Franciscan Complex by strike-slip faulting related to relative motions between the Farallon, Kula, Pacific, and North American plates. -from Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Deposition of Franciscan Complex cherts along the paleoequator and accretion to the American margin at tropical paleolatitudes
Series title:
Geological Society of America Bulletin
Volume
105
Issue:
6
Year Published:
1993
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geological Society of America Bulletin
First page:
766
Last page:
778
Number of Pages:
13