海洋Sr、Nd、Pb同位素组成演化及其示踪研究  

Study on the evolution and tracing of marine Sr, Nd, and Pb isotopic composition

作　　者：曾香兰 李杰[1] 张晶 姚会强[3,4] ZENG Xianglan;LI Jie;ZHANG Jing;YAO Huiqiang(State Key Laboratory of Isotope Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,Guangdong,China;University of Chinese Academy of Sciences,Beijing 100049,China;Guangzhou Marine Geological Survey,China Geological Survey,Guangzhou 510075,Guangdong,China;MLR Key Laboratory of Marine Mineral Resource,Ministry of Natural Resources,Guangzhou 510760,Guangdong,China)

机构地区：[1]中国科学院广州地球化学研究所,同位素地球化学国家重点实验室,广东广州510640 [2]中国科学院大学,北京100049 [3]中国地质调查局广州海洋地质调查局,广东广州510075 [4]自然资源部海底矿产资源重点实验室,广东广州510760

出　　处：《地球化学》2022年第5期598-610,共13页Geochimica

基　　金：国家自然科学基金(41673008)资助。

摘　　要：海水中的放射成因同位素被广泛地应用于古海洋环境和古气候的研究。本研究简要综述了100Ma以来海水中Nd和Pb同位素在海洋循环、物质来源方面的应用和与古气候、古地理之间的关系,以及Sr同位素对海平面变化和构造变化的指示。研究表明,海水Nd同位素组成主要受海洋循环以及岛弧风化输入的影响;Pb同位素组成受大陆物质输入的影响;Sr同位素则主要受喜马拉雅–青藏高原隆升的影响。目前,仍有一些问题需要进一步解决:一是基于准确的定年方法识别同位素信息;二是寻找到年代更久远的同位素组成变化信息;三是探究长时间尺度上同位素组成变化与气候的关系。Radiogenic isotopes in seawater have great potential for tracing the paleoceanic environment and paleoclimate. This article briefly reviews the applications of Nd and Pb isotopes in the ocean circulation and material sources of three major oceans and their relationship with paleoclimate and paleogeography, as well as the indications of Sr isotopes on sea level changes in the past 100 Ma. Studies have shown that the Nd isotope composition of seawater is mainly affected by the ocean circulation and island arc weathering input, that of Pb is affected by the continental material input, and that of Sr is mainly affected by the Himalayan-Tibetan uplift.Current challenges include accurately identifying isotopic information based on an accurate dating method,determining the isotopic composition changes with longer ages, and exploring the relationship between long-term isotopic composition changes and the climate.

关 键 词：ND同位素 PB同位素 SR同位素 古气候 古海洋环境 

分 类 号：P597.1[天文地球—地球化学]