川东中侏罗统新田沟组介形类化石壳体方解石化特征及元素成分初步分析  

ELEMENTAL ANALYSIS AND CALCIFICATION CHARACTERISTICS OF OSTRACODS FROM THE MIDDLE JURASSIC XINTIANGOU FORMATION IN EASTERN SICHUAN PROVINCE,CHINA

作　　者：方艳[1,2] 刘煜 张海春[1,2] 王博[2] 

机构地区：[1]现代古生物学和地层学国家重点实验室,南京210008 [2]中国科学院南京地质古生物研究所,南京210008 [3]长城钻探工程公司国际钻修公司,辽宁盘锦124010

出　　处：《古生物学报》2012年第1期96-101,共6页Acta Palaeontologica Sinica

基　　金：中国科学院资源与环境领域知识创新工程重要方向性项目(KZCX2-YW-154)资助

摘　　要：首次利用扫描电子显微镜观察川东新田沟组介形类化石的保存情况,并利用X射线能谱分析部分化石的元素含量及分布。研究发现新田沟组介形类壳体绝大部分方解石化,不同层位介形类壳质方解石化有所不同,且方解石化特点显示其可能与有机质作用有关。通过与前人研究结果对比发现,新田沟组壳体保存处在介形虫壳体埋藏作用的第二阶段和第三阶段。Ostracods from the Middle Jurassic Xintiangou Formation of eastern Sichuan Province, were investigated using Scanning Electron Microscope （SEM） for the first time. The porportions and distribution of some of the elements in ostracod shells （or valves） were also revealed by X-ray Energy Dispersive Spectroscopy （EDS） attached to the SEM. we show that these ostracod shells or valves have mostly been calcitized but in varying degrees in different layers of the Xintiangou Formation. The calcitization is probably related to the effect of organic matter. Comparison with previous studies indicates that the preservation of ostracods from the Xintiangou Formation is in the second and third stages in taphonomy.

关 键 词：介形类 方解石化 元素分布 新田沟组 侏罗纪 四川 

分 类 号：Q915[天文地球—古生物学与地层学]