首页> 外文会议>VII Field Conference on the Cambrian Stage Subdivision, Aug 27-Sep 8, 2001, Hunan, Guizhou, Yunnan >SINIAN-CAMBRIAN BOUNDARY STRATIGRAPHY AT GEZHONGWU, ZHIJIN COUNTY, GUIZHOU PROVINCE, CHINA: PHOSPHORITE AND SMALL SHELLY FOSSILS
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SINIAN-CAMBRIAN BOUNDARY STRATIGRAPHY AT GEZHONGWU, ZHIJIN COUNTY, GUIZHOU PROVINCE, CHINA: PHOSPHORITE AND SMALL SHELLY FOSSILS

机译:贵州省志金县葛中坞震旦纪-寒武纪界地层:磷矿和小片化石

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The Gezhongwu section is located near Gezhongwu Village, and is about 14 km southeast of the town of Zhijin. The section has been an important source of phosphorite since the 1970s. It was first reported by Yin et al. (1982), and later described in detail by Wang et al. (1984). The Gezhongwu section is the most productive section in Guizhou Province for small shelly fossils (SSFs), particularly zhijinitids (Qian and Yin, 1984a, 1984b) which was considered to be related with tardipolypods (Qian et al., 2000). The Sinian (Neoproterozoic)-Cambrian boundary succession in the Gezhongwu section consists of the Maolongjing Member of the upper part of the Tongying (Dengying) Formation, the Gezhongwu Formation, and the lower part of the Niutitang Formation (Fig. 1). The Maolongjing Member, which is not well exposed in the Gezhongwu section, is composed of thin- to medium-bedded dolomicrite with intercalations of lenticular or nodular phosphorite and chert. The thickness of the member is less than 20 m. A low-diversity assemblage of small shelly fossils first appears in the upper part of the Maolongjing Member. The assemblage includes Zhijinites, Anabarites, Conotheca, and Hyolithellus. The Gezhongwu section is the stratotype of the Gezhongwu Formation.
机译:葛忠武段位于葛忠武村附近,位于直进镇东南约14公里处。自1970年代以来,该断面一直是重要的磷矿来源。这是由尹等人首先报道的。 (1982年),后来由Wang等人详细描述。 (1984)。葛中坞断面是贵州省最具生产力的断面小化石(SSF)断面,尤其是被认为与tardipolypods有关的zhijinitids(Qian和Yin,1984a,1984b)(Qian等,2000)。葛忠武段震旦纪(新元古代)-寒武纪边界演替由统营(邓营)组上部,葛忠武组和牛塘塘组下部的毛龙井段(图1)组成。茅龙井段在葛中坞断面没有很好地暴露,它由薄到中层的白云岩组成,中间夹有透镜状或球状磷矿和and石。部件的厚度小于20 m。一种低分度的小贝壳化石组合首先出现在猫龙井段的上部。集合包括志金派,Anabatrites,Conotheca和Hyolithellus。葛忠武剖面是葛忠武组的层型。

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