Brachiopod Faunas from the Permian Jisu Honguer (Zhesi) Formation in Xilinhot, Inner Mongolia, and its significance
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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。
Abstract: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.
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Key words:
- Zhesi fauna /
- Jisu Honguer (Zhesi) Formation /
- Middle Permian /
- cool-water type /
- grain combination
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表 1 哲斯组灰岩中主要碳酸盐颗粒类型与云南保山地区对比[30]
Table 1. Comparison of carbonate grain type between Jisu Honguer (Zhesi) Formation and Baoshan area in Yunnan Province
颗粒类型 沙子坡组(暖) 丁家寨组(凉) 哲斯组(本文) 骨屑颗粒 颗粒岩 主要成分 生物碎屑丰富多样 苔藓虫、棘皮、腕足 腕足、苔藓虫、棘皮 特征成分 类、藻类 苔藓虫 腕足、苔藓虫 泥粒岩 主要成分 生物碎屑丰富多样 苔藓虫、棘皮 腕足、苔藓虫、棘皮 特征成分 䗴类、藻类 苔藓虫 苔藓虫 灰泥岩 藻类、介形虫 苔藓虫、介形虫 苔藓虫、介形虫 非骨屑颗粒 球粒、鲕粒 未见 未见 -
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