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GEOREF RECORD

Tectonic setting of blueschist and island-arc terranes of west-central Baja California, Mexico

Richard L. Sedlock
Tectonic setting of blueschist and island-arc terranes of west-central Baja California, Mexico
Geology (Boulder) (July 1988) 16 (7): 623-626

Abstract

Diverse oceanic rocks exposed in west-central Baja California (Mexico) are assigned to three shallowly dipping tectonic units. The lower plate is a subduction complex consisting of regionally metamorphosed blueschists and divided into structurally and petrologically distinct subterranes. The upper plate consists of Triassic-Lower Cretaceous are rocks and overlapping mid-Cretaceous turbidites. A fault-bounded serpentinite-matrix melange between lower and upper plate rocks contains blueschist, eclogite, amphibolite, and variably serpentinized mafic and ultramafic blocks. Lower plate blueschists were metamorphosed in the late Early Cretaceous and uplifted along shallowly dipping normal faults during conditions of steady-state subduction. Exotic blocks of blueschist, eclogite, and amphibolite are derived from a cryptic terrane or terranes, record varied P-T-t histories, and were uplifted via tectonic emplacement or diapiric rise of serpentinite along the normal faults.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 16
Serial Issue: 7
Title: Tectonic setting of blueschist and island-arc terranes of west-central Baja California, Mexico
Author(s): Sedlock, Richard L.
Affiliation: Stanford Univ., Dep. Geol., Stanford, CA, United States
Pages: 623-626
Published: 198807
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 24
Accession Number: 1988-048328
Categories: Structural geologyIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 1 table, sects., geol. sketch maps
N23°00'00" - N32°30'00", W117°00'00" - W109°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1988
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