沉积学报2012，Vol.30Issue(5)：919-927,9.
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
Rock-magnetic Characteristics of the Late Cretaceous-Early Miocene Sediments on the Kuzigongsu Section of the Northwestern Tarim Basin
摘要
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 in- dicate that thermal demagnetization and rock magnetic characteristics of rocks can be divided into three types specific- ally. Rocks from sublittoral zone, shallow of platform edge are dominated by the pseudo-single domain (PSD) magne- tite with a little amount of goethite and maghematite. Its natural remanence intensity is smaller than 1 x 10 -~A/m gen- erally, and the characteristic remanent magnetism (ChRM) are carried by magnetite and can be isolated from 250~C 500~C. 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 x 10-2 N 1A/m, and the characteristic remanent magnetism (ChRM) are carried by magnetite and can be isolated from 250~C - 580~(:. Rocks from the fluvial and lacustrine facies are dominated by the pseudo-sin- gle domain (PSD) magnetite, the hematite, with a little amount of maghemite, the goethite, Its natural remanence in- tensity is greater than 1 101A/m generally, and the characteristic remanent magnetism (ChRM) are carried by hema- tite 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.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Key words
rock magnetism/sedimentary settings/Late Cretaceous to Early Miocene/Western Tarim Basin分类
天文与地球科学引用本文复制引用
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):919-927,9.基金项目
国家973重点基础研究发展计划项目（编号：2011CB4-03000、2010CB833401）、国家自然科学基金项目（批准号：40872029、40902015）和国家教育部博士点基金资助项目（编号：20090211120027）资助.致谢室内样品测试分析由兰州大学西部环境教育部重点实验室完成,感谢兰州大学岩石磁学实验室吕斌及赵国永博士的测试帮助及有益探讨.王雪鹏、魏引杰、孟昌、杨进云、张曼等同学参与了古地磁实验工作,在此一并深表感谢,戴霜教授于百忙之中对论文提出了宝贵意见,在此表示深深谢意. （）
