| 四川盆地雅安至天全白垩系一下第三系古地磁研究 |
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| 引用本文： | 庄忠海,蒋兴治,马醒华,任希飞,徐树金,田端孝.四川盆地雅安至天全白垩系一下第三系古地磁研究[J].物探与化探,1988,12(3):224-228. |
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| 作者姓名： | 庄忠海 蒋兴治 马醒华 任希飞 徐树金 田端孝 |
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| 作者单位： | 成都地质矿产研究所
(庄忠海，蒋兴治)，地质力学研究所
(马醒华，任希飞，徐树金)，西南石油地质局地质综合研究大队(田端孝) |
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| 摘 要： | 对采自四川雅安新开店至天全始阳剖面白垩系21个采点197块样品、下第三系15个采点129块样品进行了古地磁研究。由特征剩磁方向统计,分别获得了采样区白垩纪和早第三纪的古纬度为32.5°N和31.7°N;古地磁极点位置分别为φ=172°E,λ=81.8°N和φ=75.7°E,λ=88.1°N;建立了白垩系和下第三系的磁极性地层剖面,并提出了有关地层划分和对比的意见。根据各个时期磁偏角的变化特征和古地磁极的游移轨迹可以看出,从白垩纪开始至早第三纪中晚期,采样区地块先顺时针方向旋转,然后又逆时针方向旋转。
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A PALEOMAGNETIC STUDY ALONG THE YAAN-TIANQUANCRETACEOUS-EOGENE SECTION IN SICHUAN BASIN |
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| Abstract: | 197 Cretaceous samples from 21 sites and 129 Eogene samples from 15 si-tes along the Yaan-Tianquan section in Sichuan basin are studied paleomagneti-cally. Based on statistical analysis of the characteristic directions of remanen-ce, it is obtained that the paleolatitudes of Cretaceous and Eogene are respec-tively 32. 5°Nand 31. 7°N, and the paleopole positions are repectively φ= 172°E λ = 81. 8°Nand φ= 75. 7°E, λ = 88.1°N. In addition, the magneto-stratigraphicsequence of Cretaceous-Eogene is established, and some ideas about stratigraph-ic division and correlation are suggested.From the variation characteristics of dechnations and the wandeling pathof the paleopole, it is conciuded that, during the period from Cretaceous to Eo-gene, the sampling area must have first rotated clockwise and then counter-clockwise. |
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