贵州剑河八郎“清虚洞组”掘头虫类三叶虫地层
发布时间：2018-11-04 12:20
【摘要】：贵州剑河八郎一带寒武系“清虚洞组”由灰岩、泥岩组成,下部见灰岩,中上部夹大量泥岩,顶部为深灰色中厚层白云岩,总厚272m。由于该区的“清虚洞组”岩性组成上有别于黔西、黔北地区典型的灰岩、白云岩组成的清虚洞组,也有别于丹寨地区由泥岩、灰岩组成的同期地层乌训组,加引号,以“清虚洞组”表示。八郎“清虚洞组”不仅中上部含有布尔吉斯页岩型生物群—剑河生物群,且全组含有大量三叶虫,共13属,包括褶颊虫类、莱得利基虫类及掘头虫类三叶虫,其中掘头虫类三叶虫由2属及1亚属的5种组成,即Protoryctocephalus balangensis Zhao et Yuan in Yuan et al.,2002;Protoryctocephalus elongatus Zhao et Yuan in Yuan et al.,2002;Protoryctocephalus arcticus Geyer et Peel,2011;Duyunaspis duyunensis Chang et Chien 1977及Arthricocephalus(Arthricocephalites)jishouensis Zhou in Zhou et al.,1977,分异度不高,但化石数量多。Duyunaspis duyunensis及Arthricocephalus(Arthricocephalites)jishouensis首现于“清虚洞组”下伏地层杷榔组,Protoryctocephalus balangensis及Protoryctocephalus elongatus首现于“清虚洞组”中上部并上延至其上覆地层凯里组下部,其中的Protoryctocephalus arcticus由Geyer和Peel 2011年根据格陵兰北部Peary Land地区的Henson Gletscher组中的一块头甲标本命名,出现在“清虚洞组”135m处,至239m处消失,标本数量很多。据此建立Protoryctocephalus arcticus带,但“清虚洞组”下部未见此种标本,Protoryctocephalus arcticus带仅限于八郎“清虚洞组”中、上部,下部仍要继续采集化石确定该带的存在与否。Protoryctocephalus arcticus带可与格陵兰北部的Henson Gletscher组下部Eoagostus roddyi-Arthricocephalus chauveaui带的上部对比。由于该带亦见有Redlichia(R.)guizhouensis及Redlichia(R.)nobilis,八郎“清虚洞组”中、上部或Protoryctocephalus arcticus带可与黔北清虚洞组上部进行比较。袁金良曾在包括本地区“清虚洞组”的广义清虚洞组下部建立Arthricocephalus jishouensis-Changaspis plana带,上部建立Protoryctocephalus wuxunensis带。八郎“清虚洞组”未发现这些三叶虫带。八郎“清虚洞组”Protoryctocephalus arcticus带的建立为修正该地区掘头虫类三叶虫带提供了极好的材料,为下一步在“清虚洞组”建立完善的掘头虫类三叶虫带打下基础。
[Abstract]:The Cambrian "Qingxudong formation" in Jianhebalang, Guizhou Province is composed of limestone and mudstone, with limestone in the lower part, a large amount of mudstone in the middle and upper part, and dolomite with a total thickness of 272 m at the top of the Cambrian. Because the lithologic composition of "Qingxudong formation" in this area is different from the typical limestone in western Guizhou, the Qingxuodong formation made up of dolomite, and the Wuxun formation in the same period of formation composed of mudstone and limestone in Danzhai area. It is expressed as "Qingxu Cave formation". The "Qingxudong formation" contains not only the Boergis shale-type biota-Jianhe biota, but also a large number of trilobites belonging to 13 genera, including cheekworm, Lederliki and excavator trilobites. Among them, there are 5 species in 2 genera and 1 subgenus of Tricobites, I. e., Protoryctocephalus balangensis Zhao et Yuan in Yuan et al.,2002;. Protoryctocephalus elongatus Zhao et Yuan in Yuan et al.,2002;Protoryctocephalus arcticus Geyer et Peel,2011; The differentiation degree of Duyunaspis duyunensis Chang et Chien 1977 and Arthricocephalus (Arthricocephalites) jishouensis Zhou in Zhou et al.,1977, is not high, but the number of fossils,. Duyunaspis duyunensis and Arthricocephalus (Arthricocephalites) jishouensis, are first found in the "Qingxudong formation" substratum quat nut formation. Protoryctocephalus balangensis and Protoryctocephalus elongatus are first found in the middle and upper part of the "Qingxudong formation" and extended up to the lower part of the Kaili formation of the overlying strata, in which the Protoryctocephalus arcticus was named by Geyer and Peel in 2011 according to a head armour specimen from the Henson Gletscher group in the Peary Land area of northern Greenland. It appeared at 135m in "Qingxudong Group" and disappeared at 239m, with a large number of specimens. According to this, the Protoryctocephalus arcticus zone was established, but the, Protoryctocephalus arcticus band in the lower part of "Qingxudong formation" was not only limited to the middle and upper part of the "Qingxudong formation" of Balang. The lower part should continue to collect fossils to determine whether the. Protoryctocephalus arcticus zone exists or not, which can be compared with the upper part of the lower Eoagostus roddyi-Arthricocephalus chauveaui zone of the Henson Gletscher formation in northern Greenland. The upper part or Protoryctocephalus arcticus zone can be compared with that of the upper part of Qingxudong formation in northern Guizhou Province because of the presence of Redlichia (R.) guizhouensis and Redlichia (R.) nobilis, in the "Qingxudong formation". Yuan Jinliang established Arthricocephalus jishouensis-Changaspis plana zone in the lower part and Protoryctocephalus wuxunensis zone in the upper part of the generalized Qingxuodong formation, including the "Qingxudong formation" in this area. These trilobites were not found in the "Qingxudong formation" of Balang. The establishment of the "Qingxudong formation" Protoryctocephalus arcticus zone provides an excellent material for correcting the trilobites in this area, and lays a foundation for the further establishment of a perfect trefoil belt in the "Qingxudong formation".
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：Q915
本文编号：2309798
[Abstract]:The Cambrian "Qingxudong formation" in Jianhebalang, Guizhou Province is composed of limestone and mudstone, with limestone in the lower part, a large amount of mudstone in the middle and upper part, and dolomite with a total thickness of 272 m at the top of the Cambrian. Because the lithologic composition of "Qingxudong formation" in this area is different from the typical limestone in western Guizhou, the Qingxuodong formation made up of dolomite, and the Wuxun formation in the same period of formation composed of mudstone and limestone in Danzhai area. It is expressed as "Qingxu Cave formation". The "Qingxudong formation" contains not only the Boergis shale-type biota-Jianhe biota, but also a large number of trilobites belonging to 13 genera, including cheekworm, Lederliki and excavator trilobites. Among them, there are 5 species in 2 genera and 1 subgenus of Tricobites, I. e., Protoryctocephalus balangensis Zhao et Yuan in Yuan et al.,2002;. Protoryctocephalus elongatus Zhao et Yuan in Yuan et al.,2002;Protoryctocephalus arcticus Geyer et Peel,2011; The differentiation degree of Duyunaspis duyunensis Chang et Chien 1977 and Arthricocephalus (Arthricocephalites) jishouensis Zhou in Zhou et al.,1977, is not high, but the number of fossils,. Duyunaspis duyunensis and Arthricocephalus (Arthricocephalites) jishouensis, are first found in the "Qingxudong formation" substratum quat nut formation. Protoryctocephalus balangensis and Protoryctocephalus elongatus are first found in the middle and upper part of the "Qingxudong formation" and extended up to the lower part of the Kaili formation of the overlying strata, in which the Protoryctocephalus arcticus was named by Geyer and Peel in 2011 according to a head armour specimen from the Henson Gletscher group in the Peary Land area of northern Greenland. It appeared at 135m in "Qingxudong Group" and disappeared at 239m, with a large number of specimens. According to this, the Protoryctocephalus arcticus zone was established, but the, Protoryctocephalus arcticus band in the lower part of "Qingxudong formation" was not only limited to the middle and upper part of the "Qingxudong formation" of Balang. The lower part should continue to collect fossils to determine whether the. Protoryctocephalus arcticus zone exists or not, which can be compared with the upper part of the lower Eoagostus roddyi-Arthricocephalus chauveaui zone of the Henson Gletscher formation in northern Greenland. The upper part or Protoryctocephalus arcticus zone can be compared with that of the upper part of Qingxudong formation in northern Guizhou Province because of the presence of Redlichia (R.) guizhouensis and Redlichia (R.) nobilis, in the "Qingxudong formation". Yuan Jinliang established Arthricocephalus jishouensis-Changaspis plana zone in the lower part and Protoryctocephalus wuxunensis zone in the upper part of the generalized Qingxuodong formation, including the "Qingxudong formation" in this area. These trilobites were not found in the "Qingxudong formation" of Balang. The establishment of the "Qingxudong formation" Protoryctocephalus arcticus zone provides an excellent material for correcting the trilobites in this area, and lays a foundation for the further establishment of a perfect trefoil belt in the "Qingxudong formation".
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：Q915
【参考文献】
相关期刊论文 前3条
1 彭善池;;华南寒武系年代地层系统的修订及相关问题[J];地层学杂志;2008年03期
2 赵元龙，，袁金良;贵州台江中寒武统Olenoides一新种[J];古生物学报;1994年03期
3 杨兴莲;赵元龙;彭进;杨宇宁;杨凯迪;;贵州剑河寒武系清虚洞组掘头虫类三叶虫的发现[J];高校地质学报;2010年03期
本文编号：2309798
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