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| 100Ma来海水的锶同位素组成演化及主要控制因素 | |
| 引用本文： | 黄成刚,黄思静,吴素娟,陈启林.100Ma来海水的锶同位素组成演化及主要控制因素[J].地球科学与环境学报,2006,28(2):19-24. |
| 作者姓名： | 黄成刚 黄思静 吴素娟 陈启林 |
| 作者单位： | 1. 成都理工大学,油气藏地质及开发工程国家重点实验室,四川,成都,610059;中国石油勘探开发研究院,西北分院,甘肃,兰州,730020 2. 成都理工大学,油气藏地质及开发工程国家重点实验室,四川,成都,610059 3. 中国石油勘探开发研究院,西北分院,甘肃,兰州,730020 |
| 摘 要： | 讨论了100 Ma以来海水锶同位素比值的变化趋势及控制因素。100~40 Ma期间,海水锶同位素比值有多次升降,总体上变化幅度较小;40 Ma以来,海水锶同位素比值显著增加,并呈现出单调上升的总体特征。100 Ma以来海水锶同位素的变化主要可能与星外物体对地球的撞击作用;全球海平面变化及洋中脊扩张速度的改变;喜马拉雅—青藏高原的隆升;玄武岩喷发和冰川作用因素有关。在各种因素中,喜马拉雅—青藏高原的隆升对40 Ma以来海水锶同位素演化具有最重要的控制作用。喜马拉雅—青藏高原的隆升可能始于40 Ma左右,隆升速度最快的时期在20~15 Ma。 |
| 关 键 词： | 海水锶同位素组成 100Ma来 地质事件 青藏高原隆升 全球海平面变化 |
| 文章编号： | 1672-6561（2006）02-0019-06 |
| 收稿时间： | 2005-07-05 |
| 修稿时间： | 2005年7月5日 |
Sr-isotope Composition and Evolvement in Sea Water Over Past 100 Ma and Control Factors |
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| HUANG Cheng-gang,HUANG Si-jing,WU Su-juan,CHEN Qi-lin.Sr-isotope Composition and Evolvement in Sea Water Over Past 100 Ma and Control Factors[J].Journal of Earth Sciences and Environment,2006,28(2):19-24. | |
| Authors: | HUANG Cheng-gang HUANG Si-jing WU Su-juan CHEN Qi-lin |
| Institution: | 1, State Key Laboratory of Oil/Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China, 2. Nortwest Institute of Geology, PetroChina, Lanzhou 730020, Gansu, China |
| Abstract: | The Sr-isotope composition and evolvement in sea water since 100 Ma and the controlling factors are discussed. The sea water 87 Sr/86 Sr ratios in the period of 40- 100 Ma have some fluctuations with smaller extent. The sea water 87 Sr/86 Sr ratios have increased rapidly and monotonously since 40 million years, The following factors controlled the Sr isotope composition and evolvement in sea water since 100 Mat the possible impact of extraterrestrial object; the global sea-level change and the spread rate of the mid-oceanic ridge; the uplift of Himalaya-Tibet; the eruption of major continental flood bassalts and glaciations. Among of above factors, the uplift of Himalaya-Tibet plays an important role in the evolution of seawater 87 Sr/86 Sr ratios for the last 40 Ma. The starting time for the Himalayan-Tibet uplift should be at 40 Ma BP, and the most rapid period of the uplift took place during 20-15 Ma. |
| Keywords: | Sr-isotope composition in sea water over the past 100 Ma geological events uplift of Himalaya-Tibet global sea-level change |
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