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Geomagnetic polarity transitions recorded in the Miocene lavas of the Wuyu basin, Tibet

Geomagnetic polarity transitions recorded in the Miocene lavas of the Wuyu basin, Tibet
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摘要 Geomagnetic polarity transitions were the most important phenomena in the study of the geomagnetic field evolution and the earth's deep interior dynamics.The Miocene postcollisional ultrapotassic-potassic rocks are widely distributed in the Lhasa Block of southern Tibet.Paleomagnetic studies on the Wuyu Formation indicated that these volcanic rocks recorded the C5Bn.2n-C5Bn.1r and C5ACr-C5ACn geomagnetic polarity transitions.The virtual geomagnetic poles(VGPs) of these two polarity transitions were located in the Atlantic and the central Pacific,respectively.Due to data scarcity,it remains unclear whether VGP paths of Miocene geomagnetic polarity transitions were longitudinal preference and/or 90° away from the sampling sites. Geomagnetic polarity transitions were the most important phenomena in the study of the geomagnetic field evolution and the earth's deep interior dynamics. The Miocene postcollisional ultrapotassic-potassic rocks are widely distributed in the Lhasa Block of southern Tibet. Paleomagnetic studies on the Wuyu Formation indicated that these volcanic rocks recorded the C5Bn.2n-C5Bn.lr and C5ACr-C5ACn geomagnetic polarity transitions. The virtual geomagnetic poles (VGPs) of these two polarity transitions were located in the Atlantic and the central Pacific, respectively. Due to data scarcity, it remains unclear whether VGP paths of Miocene geomagnetic polarity transitions were longitudinal preference and/or 90° away from the sampiing sites.
作者 TONG YaBo YANG ZhenYu PAN YongXin ZHENG LianDi SUN ZhiMing PEI JunLing ZHUANG ZhongHai Tong YaBo[1,2];Yang ZhenYu[1];Pan YongXin[3];Zheng LianDi[1];Sun ZhiMing[2];Pei JunLing[2];Zhuang ZhongHai[4];
出处 《中国科学:地球科学英文版》 SCIE EI CAS 2011年第4期561-570,共10页 SCIENCE CHINA Earth Sciences
基金 We are very grateful to Prof. Zhu Rixiang for his comments. This study was supported by China Geological Survey (Grant No. 1212010511704).
关键词 地磁极性转换 西藏南部 中新世 火山岩 地球深部动力学 盆地 太平洋中部 磁场演化 Tibetan Plateau, Miocene, volcanics, paleomagnetic, geomagnetic polarity transition
作者简介 Corresponding author (email: yangzy@public3.bta.net.cn)
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