Well-preserved underplating structure of the jadeitized Franciscan complex, Pacheco Pass, California

G. Kimura, S. Maruyama, Y. Isozaki, M. Terabayashi

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Duplex structures several hundred metres thick bounded by marker beds exhibiting basalt-chert association have been found in the Franciscan complex near Pacheco Pass, central Diablo Range, California. The terrane was regionally metamorphosed and deformed under blueschist facies conditions at 150°C and 7-8 kbar. Detailed mapping of the basalt-chert sequence has clarified the change of environment from mid-oceanic ridge to subduction zone. Eastward convergence of duplexing indicates eastward subduction of the oceanic plate during Early Cretaceous time. The presence of duplexing and a reconstruction of oceanic plate stratigraphy recorded within the underthrust unit demonstrate the accretionary origin of protoliths of the Franciscan coherent unit, which has long been believed to have an in situ origin, interpreted as either near-trench volcanism or accreted terranes in which "geosynclinal-type" volcanism occurred.

Original languageEnglish
Pages (from-to)75-78
Number of pages4
JournalGeology
Volume24
Issue number1
DOIs
Publication statusPublished - Jan 1996
Externally publishedYes

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underplating
chert
terrane
volcanism
basalt
marker bed
blueschist facies
duplex
protolith
subduction zone
trench
stratigraphy
subduction
Cretaceous
in situ

ASJC Scopus subject areas

  • Geology

Cite this

Well-preserved underplating structure of the jadeitized Franciscan complex, Pacheco Pass, California. / Kimura, G.; Maruyama, S.; Isozaki, Y.; Terabayashi, M.

In: Geology, Vol. 24, No. 1, 01.1996, p. 75-78.

Research output: Contribution to journalArticle

Kimura, G. ; Maruyama, S. ; Isozaki, Y. ; Terabayashi, M. / Well-preserved underplating structure of the jadeitized Franciscan complex, Pacheco Pass, California. In: Geology. 1996 ; Vol. 24, No. 1. pp. 75-78.
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