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| 塔里木盆地西北缘库孜贡苏剖面晚白垩世-早中新世沉积物岩石磁学研究 | |
| 引用本文： | 张志高,迟云平,脱世博,吴松,刘艳蕊,张涛,滕晓华,方小敏,宋春晖.塔里木盆地西北缘库孜贡苏剖面晚白垩世-早中新世沉积物岩石磁学研究[J].沉积学报,2012,30(5):919-927. |
| 作者姓名： | 张志高 迟云平 脱世博 吴松 刘艳蕊 张涛 滕晓华 方小敏 宋春晖 |
| 作者单位： | 1. 兰州大学西部环境教育部重点实验室兰州大学西部环境与气候变化研究院,兰州,730000 2. 兰州大学地质科学与矿产资源学院,兰州,730000 3. 兰州大学西部环境教育部重点实验室兰州大学西部环境与气候变化研究院,兰州730000 中国科学院青藏高原研究所,北京100085 |
| 基金项目： | 国家973重点基础研究发展计划项目(编号:2011CB403000、2010CB833401);国家自然科学基金项目(批准号:40872029、40902015);国家教育部博士点基金资助项目(编号:20090211120027)资助 |
| 摘 要： | 对塔里木盆地西北缘库孜贡苏剖面晚白垩世-早中新世沉积物进行了热退磁及岩石磁学研究，结果表明岩石热退磁及岩石磁学特征随沉积环境可分为三种类型:潮下、台地边缘浅滩相岩石主要磁性矿物为磁铁矿及少量针铁矿、磁赤铁矿，磁性矿物含量较少、颗粒较小（假单畴），其天然剩磁强度较小，一般小于1×10-2 A/m，在250℃~500℃能获得稳定特征剩磁方向，特征剩磁由磁铁矿携带；潮间、潮上带岩石主要磁性矿物为磁铁矿，〖JP2〗并含有少量磁赤铁矿、赤铁矿、针铁矿，磁性矿物颗粒为假单畴和多畴，天然剩磁强度一般在1×10-2 ~1 A/m之间，在250℃~580℃能获得稳定特征剩磁方向，特征剩磁由磁铁矿携带；河湖相岩石主要磁性矿物为磁铁矿、赤铁矿，并含有少量磁赤铁矿、针铁矿，磁性矿物含量较多、颗粒较小（假单畴），天然剩磁强度一般在1×10-1 A/m以上，多数样品特征剩磁由赤铁矿携带，少数由磁铁矿与赤铁矿共同携带。岩石磁学研究对于在沉积环境复杂剖面进行古地磁研究具有重要的意义。 |
| 关 键 词： | 岩石磁学 沉积环境 晚白垩世- 早中新世 塔里木西北缘 |
Rock-magnetic Characteristics of the Late Cretaceous-Early Miocene Sediments on the Kuzigongsu Section of the Northwestern Tarim Basin |
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| ZHANG Zhi-gao,CHI Yun-ping,TUO Shi-bo,WU Song,LIU Yan-rui,ZHANG Tao,TENG Xiao-hua,FANG Xiao-min,SONG Chun-hui.Rock-magnetic Characteristics of the Late Cretaceous-Early Miocene Sediments on the Kuzigongsu Section of the Northwestern Tarim Basin[J].Acta Sedimentologica Sinica,2012,30(5):919-927. | |
| Authors: | ZHANG Zhi-gao CHI Yun-ping TUO Shi-bo WU Song LIU Yan-rui ZHANG Tao TENG Xiao-hua FANG Xiao-min SONG Chun-hui |
| Institution: | 1.Laboratory of Western China’s Environmental Systems,Ministry of Education of China,Research School of Arid Environment & Climate Change,Lanzhou University,Lanzhou 730000; 2.School of Earth Sciences,Lanzhou University,Lanzhou 730000; 3.Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100085) |
| Abstract: | We have carried out an rock magnetism investigation and thermal demagnetization for the Late Cretaceous to Early Miocene sediments on Kuzigongsu section from the Northwestern Tarim basin,Western China.The results indicate that thermal demagnetization and rock magnetic characteristics of rocks can be divided into three types specifically.Rocks from sublittoral zone,shallow of platform edge are dominated by the pseudo-single domain(PSD) magnetite with a little amount of goethite and maghematite.Its natural remanence intensity is smaller than 1×10-2A/m generally,and the characteristic remanent magnetism(ChRM) are carried by magnetite and can be isolated from 250℃~500℃.Rocks from intertidal zone and supratidal zone are dominated by pseudo-single domain and multi-domain(PSD﹢MD) magnetite generally,with a little amount of goethite,maghematite and hematite.It’s natural remanence intensity is between 1×10-2~1A/m,and the characteristic remanent magnetism(ChRM) are carried by magnetite and can be isolated from 250℃~580℃.Rocks from the fluvial and lacustrine facies are dominated by the pseudo-single domain(PSD) magnetite,the hematite,with a little amount of maghemite,the goethite,Its natural remanence intensity is greater than 1 10-1A/m generally,and the characteristic remanent magnetism(ChRM) are carried by hematite in most samples,and carried by magnetite and hematite in some samples.So investigation of rock magnetism on sediments from different sedimentary environments is important for the paloemagnetic research. |
| Keywords: | rock magnetism sedimentary settings Late Cretaceous to Early Miocene Western Tarim Basin |
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