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

Mihai N. Ducea; Steven Kidder; George Zandt

doi:10.1029/2002GL016297

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

Mihai N. Ducea, Steven Kidder, George Zandt

Geosciences

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

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 language	English (US)
Pages (from-to)	36-1 - 36-4
Journal	Geophysical Research Letters
Volume	30
Issue number	13
DOIs	https://doi.org/10.1029/2002GL016297
State	Published - Jul 1 2003

ASJC Scopus subject areas

Geophysics
General Earth and Planetary Sciences

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10.1029/2002GL016297

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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.",

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

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