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| 塔里木地块库车坳陷早白垩世古地磁结果及磁倾角偏低的成因探讨 | |
| 引用本文： | 方大钧,沈忠悦,谈晓冬.塔里木地块库车坳陷早白垩世古地磁结果及磁倾角偏低的成因探讨[J].地球物理学报,2001,44(1):72-82. |
| 作者姓名： | 方大钧 沈忠悦 谈晓冬 |
| 作者单位： | 1. ##浙江大学地球科学系, 2. 杭州 310027 3. ##Dept.of Earth and Environmental Science Lehigh University, 4. Bethlehem,U.S.A. |
| 基金项目： | 国家自然科学基金项目 !(49974 0 1 6) . |
| 摘 要： | 运用主成分分离及线性区段等方法 ,使早白垩世样品明显分离出二组磁组分 .叠加剩磁为喜山期重磁化 ,特征剩磁明显偏离现代地磁场方向 ,经倾斜校正后 ,有很好的一致性并通过了倒转检验 ,给出塔里木地块库车坳陷早白垩世巴西盖组古地磁新数据 .综合已有的古地磁结果 ,获得了塔里木地块早白垩世平均剩磁方向及平均古地磁极 ,阐明了塔里木地块早白垩世磁倾角明显偏低这一现象 .分析导致磁倾角偏低的诸多因素 ,认为压实作用可能是导致磁倾角偏低的重要因素之一 . |
| 关 键 词： | 塔里木地块 早白垩世 古地磁 磁倾角 压实作用 |
| 文章编号： | 0001-5733(2001)01-0072-11 |
| 修稿时间： | 2000年3月31日 |
PALEOMAGNETIC STUDY ON KUCHE DEPRESS OFTARIM BLOCK IN EARLY CRETACEOUS ANDITS INCLINATION SHALLOWING |
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| FANG DA,JUN,SHEN ZHONG,YUE.PALEOMAGNETIC STUDY ON KUCHE DEPRESS OFTARIM BLOCK IN EARLY CRETACEOUS ANDITS INCLINATION SHALLOWING[J].Chinese Journal of Geophysics,2001,44(1):72-82. | |
| Authors: | FANG DA JUN SHEN ZHONG YUE |
| Abstract: | The paleomagnetic results of Baxigai formation of early Cretaceous in Kuche depression,Tarim block are reported. Two magnetic components were clearly isolated by means of principal component analysis method and Linefind method.Overprint component is a remagnetization of Himalayan,which is close to the present magnetic direction.Characteristic magnetic remanence shows obviously offset present magnetic direction.After tilted correction,ChRM shows well consistent and passed reversal test.Early Cretaceous magnetic mean direction was obtained by summarizing most of published paleomagnetic data in this area. Inclination shallowing is noticed in the early Cretaceous stratum,which could not be explained by tectonics only if we consider the periphery plates.Some factors,such as quality of paleomagnetic data,sedimentary process,as well as long period non dipole field and so on are excluded. The compaction is believed to be the most important factor resulting in inclination shallowing.Much more work should be done to verify this hypothesis and this will provide evident for solving the problem in tectonics |
| Keywords: | Tarim block Early cretaceous Paleomagnetism compaction inclination |
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