PALEOMAGNETISM OF MIDDLE MIOCENE VOLCANIC-ROCKS IN THE MOJAVE-SONORA DESERT REGION OF WESTERN ARIZONA AND SOUTHEASTERN CALIFORNIA

被引：35

作者：

CALDERONE, GJ ^{[1
]}

BUTLER, RF ^{[1
]}

ACTON, GD ^{[1
]}

机构：

[1] UNIV ARIZONA,DEPT GEOSCI,TUCSON,AZ 85721

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS | 1990年 / 95卷 / B1期

关键词：

D O I：

10.1029/JB095iB01p00625

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Paleomagnetic directions have been obtained from 190 early to middle Miocene (12-20Ma) mafic volcanic flows in 16 mountain ranges in the Mojave-Sonora desert region of western Arizona and southeastern California. After detailed demagnetization experiments, 179 flows yielded characteristic directions interpreted as original thermal remanent magnetizations (TRM). Because of the episodic nature of basaltic volcanism in this region, the 179 flows yielded only 65 time-distinct virtual geomagnetic poles (VGPs). The paleomagnetic pole calculated from the 65 cooling unit VGPs is located at 85.5°N, 108.9°E within a 4.4° circle of 95% confidence. This pole is statistically indistinguishable (at 95% confidence) from reference poles calculated from rocks of similar age in stable North America and from a paleomagnetic pole calculated from rocks of similar age in Baja California. -from Authors

引用

页码：625 / 647

页数：23

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[11] DISCORDANT PALEOMAGNETIC POLE POSITIONS AS EVIDENCE OF REGIONAL SHEAR IN WESTERN CORDILLERA OF NORTH-AMERICA [J].