用
  <sup>87</sup>Sr/
  <sup>86</sup>Sr研究海平面变化与全球对比问题

doi:10.11867/j.issn.1001-8166.2000.06.0729

地球科学进展 ›› 2000, Vol. 15 ›› Issue (6): 729 -733. doi: 10.11867/j.issn.1001-8166.2000.06.0729

用 ⁸⁷Sr/ ⁸⁶Sr研究海平面变化与全球对比问题

李荣西 ^①②,魏家庸 ^③,杨卫东 ^①,郭庆军 ^①

①中国科学院地球化学研究所矿床地球化学开放研究实验室,贵州贵阳 550002;②西安工程学院,陕西西安 710054;③贵州省区域地质调查研究院,贵州贵阳 550005

收稿日期:1999-08-30 修回日期:2000-05-08 出版日期:2000-12-01
通讯作者: 李荣西(1966-),男,汉族,甘肃省宁县人,博士后,主要研究方向为油气地质与地球化学。
基金资助:
国家自然科学基金项目“吐哈盆地侏罗系储层地球化学研究”(编号:49773179);中国博士后科学基金项目“用TOF-SIMS分析矿物中单个有机包裹体成分”(编号:1999/10)和贵州省自然科学基金项目“黔西南三叠纪高分辨率层序地层的同位素地球化学响应(编号:99-3091)联合资助。

VARIATIONS OF RATIO OF87Sr/86Sr IN SEAWATER WITH TIME:IMPLICATIONS FOR SEA LEVEL CHANGES AND GLOBAL CORRELATION

LI Rong-xi ^①②,WEI Jia-yong ^③,YAN Wei-dong ^①,GUO Qing-jun ^①

①Geochemistry Institute,CAS,Guiyang550002,China;②Xi'an Engineering University,Xi'an 710054,China;③Guizhou Bureau of Geology and Mineral Resources,Guiyang550005,China

Received:1999-08-30 Revised:2000-05-08 Online:2000-12-01 Published:2000-12-01

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综述了近年来国际上在Sr同位素研究应用方面的新成果,着重讨论了如何应用海相沉积岩(物)⁸⁷Sr/⁸⁶Sr比值来研究海平面变化和全球对比问题。综合分析表明,海水Sr同位素组成受Sr的来源控制,海水⁸⁷Sr/⁸⁶Sr比值随时间变化与海平面变化有内在的联系,高频旋回(时限约2.0Ma)的⁸⁷Sr/⁸⁶Sr变化与三级海平面变化相对应。研究认为牙形石是分析Sr同位素组成最理想的样品,用之建立的⁸⁷Sr/⁸⁶Sr变化曲线最具全球对比意义。与国外相比,我国在这方面研究成果较少,但从地质条件分析,我国独有的一些地质记录,在古海平面变化和全球对比研究中占据着不可缺少或不可代替的地位,其中扬子地块西南缘二叠—三叠纪界限附近的⁸⁷Sr/⁸⁶Sr变化曲线,可以弥补国外一些学者建立的自显生宙以来全球海水87Sr/86Sr变化曲线在该时段存在的“断层”现象。

关键词: 锶同位素, 海平面变化, 全球对比, 牙形石

Strontium(Sr) is one of the most sensitive indicators to seawater. It has been widely exploited both in terms of its concentration and particularly in its isotope, which has been used to investigating ancient sea level fluctuations. Appreciable progresses have been achieved in recent years, but problems still remained with the seawater87Sr/86Sr curve construction for the purpose of global correlation. It is shown that the variations of ⁸⁷Sr/⁸⁶Sr throughout the Phanerozoic are related to the sea level changes. High-frequence(2.0 Ma) fluctuations in seawater ⁸⁷Sr/⁸⁶Sr consistent with third-order sequence. These changes are controlled by Sr sources of the seawater. There are two main Sr sources, one is“the continental Sr”with a high ⁸⁷Sr/⁸⁶Sr, which is input to seawater by flux, the other one is“the oceanic Sr”with a low ⁸⁷Sr/⁸⁶Sr, which is got into seawater directly by hydrothermal circulation through seafloor. Conodont is the idea sample for the studies because of its precise stratigraphic age and high Sr concentrations as well as relatively resistant to digenetic alternation. The ⁸⁷Sr/⁸⁶Sr curve of seawater constructed by using conodont is the best standard for global correlation. China possesses some unique geological records, such as the continuous sedimentation at the Permian/Triassic boundary, which is very helpful to supplement the gap in the87Sr/86Sr curve constructed for seawater from Permian to Jurassic by R. B. Koepnicket al(1998) on the basis of Burkeet al(1982).

Key words: Strontium isotope, Sea level change, Global correlation, Conodont.

中图分类号:

P736.21+3

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