贵州册亨中三叠统坡段组中上部石珊瑚及牙形石生物地层

发布时间：2018-11-05 07:35

【摘要】：为进一步精确限定黔西南中三叠统坡段组的地质时代,论文选择贵州册亨中三叠统坡段组典型剖面开展了石珊瑚及牙形石生物地层研究,在中三叠统坡段组(中上部)识别出石珊瑚3属3种,它们包括Pentasmilia zaitingnaensis,Pinacophyllum spizzensis,Gillastraea delicate;识别出牙形石Neogondolella constricta带。该带除含有带分子外,还含有Neogondolella bulgarica,Neogondoela navicula,Neogondolella acuta,Neogondolella alpina alpina,Cratognathodus kochi,Ozarkodina tortilis,Prioniodinasp.,Lonchodinasp.等重要牙形石。通过对牙形石特征的分析和国内外同名带的对比,认为坡段组Neogondolella constricta带大体可与贵州省盘县地区羊圈-楚皮凹剖面中三叠统关岭组上段、贵州罗甸关刀(2)剖面关刀岩楔、和云南开远马者哨法郎组的同名化石带对比,进而确定贵州册亨地区坡段组含牙形石Neogondolella constricta带的地层时代为安尼期的Illyrian亚期。
[Abstract]:In order to further define the geological age of the middle Triassic slope formation in southwestern Guizhou, the typical sections of the middle Triassic slope formation in Ceheng, Guizhou Province, were selected to study the lithocorals and conodont biostratigraphy. 3 genera and 3 species of stone coral have been identified in the middle Triassic slope formation (middle and upper part), including Pentasmilia zaitingnaensis,Pinacophyllum spizzensis,Gillastraea delicate;. The conodont Neogondolella constricta zone was identified. In addition to the band molecules, the band also contains Neogondolella bulgarica,Neogondoela navicula,Neogondolella acuta,Neogondolella alpina alpina,Cratognathodus kochi,Ozarkodina tortilis,Prioniodinasp.,Lonchodinasp.. And other important conodonts. Based on the analysis of the conodont characteristics and the comparison of the eponymous belt at home and abroad, it is considered that the Neogondolella constricta belt of the slope formation can be roughly compared with the upper member of the Guanling formation in the middle Triassic of the Yangzhuan-Chupiao section in Panxian area, Guizhou Province, and the GuanDao (2) section of the Luodian GuanDao (2) section of Guizhou Province. The stratigraphic age of the conodont Neogondolella constricta zone in the slope formation of the Baiheng region, Guizhou Province, is determined to be the Illyrian substage of the Annian period by comparison with the fossil belt of the same name in the Maayuzhoufen formation, Kaiyuan, Yunnan Province.
【作者单位】：中国地质科学院地质研究所;国土资源部地层与古生物重点实验室;中国科学院地球化学研究所矿床地球化学国家重点实验室;武警黄金第二支队;新疆地质矿产开发局第七地质大队;
【基金】：科技部科技基础性工作专项项目(编号2015FY310100) 国家自然科学基金项目(编号41472030) 中国地质调查局项目(编号DD20160120-04,12120114026701,DD20160345)资助的成果
【分类号】：Q915;P534.51

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