MAGNETOTELLURIC EVIDENCE FOR A BRITTLE-DUCTILE TRANSITION, PENINSULAR RANGES BATHOLITH, SOUTHERN CALIFORNIA

被引：11

作者：

PARK, SK ^{[1
]}

JIRACEK, GR ^{[1
]}

JOHNSON, KM ^{[1
]}

机构：

[1] SAN DIEGO STATE UNIV,DEPT GEOL SCI,SAN DIEGO,CA 92182

来源：

GEOPHYSICAL RESEARCH LETTERS | 1992年 / 19卷 / 21期

关键词：

D O I：

10.1029/92GL02439

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

A magnetotelluric traverse of the Peninsular Ranges in southern California has revealed a pervasive zone of lower resistivity beginning at a uniform depth of 10 km and extending to depths of 60-90 lan. Resistivities above 10 km depth are similar to those found in batholiths; very high values correspond to outcrops of crystalline basement. Because seismicity below 11-12 km is sparse, others have concluded that the brittle-ductile transition is shallow beneath the range. The zone of low resistivity in the lower crust corresponds well to the ductile region, and we conclude that the lower values are caused by fluids trapped below the transition. Because the range has experienced vertical uplifts during the Pliocene era and the top of the low resistivity zone is flat, the present brittle-ductile transition must have been formed in the last 5 M.y. A possible source for the fluids is the rift to the east in the Salton Trough.

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页码：2143 / 2146

页数：4

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