Crustal structure of the Peninsular Ranges batholith from magnetic data: Implications for Gulf of California rifting

Details Crustal structure of the Peninsular Ranges batholith from magnetic data: Implications for Gulf of California rifting Crustal structure of the Peninsular Ranges batholith from magnetic data: Implications for Gulf of California rifting

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30k..51l&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 11, pp. 51-1, CiteID 1597, DOI 10.1029/2003GL017159

Physics

3

Structural Geology: Local Crustal Structure, Tectonophysics: Continental Tectonics-Extensional (0905), Tectonophysics: Continental Tectonics-General (0905), Information Related To Geographic Region: North America

Scientific paper

A 70-km-wide belt of magnetic highs extends ~1200 km northwest from the southern tip of the Baja California peninsula into southern California. The anomalies are caused by the mafic western belt of the Peninsular Ranges batholith, which is exposed extensively along the northern 800 km length of the magnetic belt. Modeling indicates that the source of the anomalies extends to mid-to lower crustal depths. The linearity and undisrupted nature of the magnetic belt support the hypothesis that the peninsula has behaved as a rigid block and has resisted significant (>50 km) strike-slip deformation during the Tertiary. The absence of a corresponding magnetic belt along the coast of mainland Mexico to the south suggests that the location of rifting in the Gulf of California was influenced by the mafic Western Peninsular Ranges batholithic crust, perhaps because it is thermally and mechanically more resistant to deformation than the surrounding crust.

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