The environmental index of the rare earth elements in conodonts:Evidence from the Ordovician conodonts of the Huanghuachang Section,Yichang area

作     者：CHEN XiaoHong ZHOU Lian WEI Kai WANG Jin LI ZhiHong 

作者机构：Wuhan Institute of Geology and Mineral ResourcesWuhan 430223China Geological Processes and Mineral ResourcesState Key Laboratory of China University of GeosciencesWuhan 430074China 

出 版 物：《Chinese Science Bulletin》 (中国科学通报)

年 卷 期：2012年第57卷第4期

页      面：349-359页

核心收录：

学科分类：081803[工学-地质工程] 081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0818[工学-地质资源与地质工程] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：supported by China Geological Survey(1212011121103 and 1212010710715) the National Natural Science Foundation of China(40972003 and 40673020) 

主　　题：稀土元素 宜昌地区 牙形石 奥陶系 环境指标 LA-ICP-MS 证据 黄花 

摘      要：High-resolution microanalysis was performed on conodonts collected from the Huanghuachang section in the Yichang area using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). This region is regarded as a standard section for the division and correlation of the Ordovician system in southern China. The results show that the values of (La/Yb)N and (La/Sm)N decrease, while the values of δCe increase as seawater deepens and energy decreases. As the sedimentary environment changes from shallow-water carbonate platform to platform margin to open continental shelf to shelf basin, rare earth element distribution curves gradually transform from a right inclined pattern to a flat pattern to a left inclined pattern and a hat-shaped pattern. The present work proves that the values and distributive patterns of rare earth elements in conodonts correspond with the sedimentary environment, and therefore provide reliable evidence for the application of rare earth element concentrations of biogenic phosphates such as conodonts for palaeoenvironmental reconstructions.