Arc composition at mid-crustal depths: Insights from the Coast Ridge Belt, Santa Lucia Mountains, California

Mihai N Ducea, Steven Kidder, George Zandt

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

The Coast Ridge Belt (CRB, Santa Lucia Mts., central California) comprises mid-crustal rocks (750-800°C and 0.8 GPa) of the California magmatic arc. We estimated the bulk composition of the CRB and converted our results to seismic velocities expected at the observed pressures and temperatures. The bulk composition of this arc section changes abruptly at 25 km depth from a granodiorite to a quartz-diorite or diorite. These data are in agreement with results from other Cordilleran batholiths suggesting 1.5 to 2 times thicker felsic columns than interpreted for modern continental arcs, and a relatively sharp transition from a felsic upper crustal batholith, and a mafic deep crust. This implied rheological boundary may have significant implications for intracrustal faulting or convective removal of the roots of batholiths.

Original languageEnglish (US)
Pages (from-to)36-31
Number of pages6
JournalGeophysical Research Letters
Volume30
Issue number13
StatePublished - Jul 1 2003

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diorite
batholiths
coasts
mountains
ridges
arcs
continental arc
mountain
coast
batholith
seismic velocity
granodiorite
faulting
crust
quartz
crusts
rocks
rock
temperature
removal

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Arc composition at mid-crustal depths : Insights from the Coast Ridge Belt, Santa Lucia Mountains, California. / Ducea, Mihai N; Kidder, Steven; Zandt, George.

In: Geophysical Research Letters, Vol. 30, No. 13, 01.07.2003, p. 36-31.

Research output: Contribution to journalArticle

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