内蒙古锡林浩特二叠系哲斯组腕足动物群特征及其意义  

Brachiopod Faunas from the Permian Jisu Honguer(Zhesi) Formation in Xilinhot,Inner Mongolia, and its significance

作　　者：杨兵 张雄华[2] 杨欣杰 夏浩东 

机构地区：[1]中国地质调查局国土资源实物地质资料中心,河北廊坊065201 [2]中国地质大学地球科学学院,湖北武汉430074

出　　处：《地质通报》2017年第10期1683-1690,共8页Geological Bulletin of China

基　　金：中国地质调查局项目<整装勘查区1:5万矿产地质调查实物资料应用与服务>(编号:DD20160051)

摘　　要：内蒙古锡林浩特克什克腾旗哈尔呼舒剖面哲斯组灰岩中发现了大量腕足化石,经鉴定计有22属42种,以长身贝亚目和石燕贝亚目为主,化石组合面貌具有典型的哲斯动物群特征。根据其与邻区的腕足生物地层对比,确定该腕足生物群时代为中二叠世Wordian期。哲斯动物群中凉水型分子共计10属26种,约占种级总量的61.9%,暖水型分子仅1种,约占种级总量的2.4%,体现了典型的凉水型动物群特征。古生物地理区划属于北方生物地理大区。此外,哲斯组碳酸盐岩中颗粒组合属于苔藓虫-棘皮动物-腕足动物组合,代表凉水沉积环境,也印证了哲斯动物群的凉水型特征。Lots of brachiopods(mainly consisting of Productidina and Spiriferidina) which include 22 genera and 42 species were discovered in Jisu Honguer(Zhesi) Formation, Howl Shu section, Hexigten Banner, Inner Mongolia. They show typical Zhesi fauna characteristics. Brachiopod biostratigraphic correlations with adjacent areas show that this brachiopod fauna should belong to Middle Permian Wordian period. There are 10 genera and 26 species of cold-water type elements in Zhesi fauna, which account for 61.9%of the total species, and only 1 species of warm-water element, which accounts for 2.4%, showing typical cool-water type fauna characteristics and belonging to the Boreal Realm. Furthermore, the grain combination of carbonate in Jisu Honguer(Zhesi) Formation belongs to Bryozoan-Echinoderm-Brachiopod assemblage, representing the cool water sedimentary environment, and this also confirms the cool-water characteristics of Zhesi fauna.

关 键 词：哲斯动物群 哲斯组 中二叠世 凉水型 颗粒组合 

分 类 号：P534.46[天文地球—古生物学与地层学] Q915.816[天文地球—地质学]