【摘要】：貴州劍河八郎一帶寒武系“清虛洞組”由灰?guī)r、泥巖組成,下部見灰?guī)r,中上部夾大量泥巖,頂部為深灰色中厚層白云巖,總厚272m。由于該區(qū)的“清虛洞組”巖性組成上有別于黔西、黔北地區(qū)典型的灰?guī)r、白云巖組成的清虛洞組,也有別于丹寨地區(qū)由泥巖、灰?guī)r組成的同期地層烏訓(xùn)組,加引號,以“清虛洞組”表示。八郎“清虛洞組”不僅中上部含有布爾吉斯頁巖型生物群—劍河生物群,且全組含有大量三葉蟲,共13屬,包括褶頰蟲類、萊得利基蟲類及掘頭蟲類三葉蟲,其中掘頭蟲類三葉蟲由2屬及1亞屬的5種組成,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,分異度不高,但化石數(shù)量多。Duyunaspis duyunensis及Arthricocephalus(Arthricocephalites)jishouensis首現(xiàn)于“清虛洞組”下伏地層杷榔組,Protoryctocephalus balangensis及Protoryctocephalus elongatus首現(xiàn)于“清虛洞組”中上部并上延至其上覆地層凱里組下部,其中的Protoryctocephalus arcticus由Geyer和Peel 2011年根據(jù)格陵蘭北部Peary Land地區(qū)的Henson Gletscher組中的一塊頭甲標本命名,出現(xiàn)在“清虛洞組”135m處,至239m處消失,標本數(shù)量很多。據(jù)此建立Protoryctocephalus arcticus帶,但“清虛洞組”下部未見此種標本,Protoryctocephalus arcticus帶僅限于八郎“清虛洞組”中、上部,下部仍要繼續(xù)采集化石確定該帶的存在與否。Protoryctocephalus arcticus帶可與格陵蘭北部的Henson Gletscher組下部Eoagostus roddyi-Arthricocephalus chauveaui帶的上部對比。由于該帶亦見有Redlichia(R.)guizhouensis及Redlichia(R.)nobilis,八郎“清虛洞組”中、上部或Protoryctocephalus arcticus帶可與黔北清虛洞組上部進行比較。袁金良曾在包括本地區(qū)“清虛洞組”的廣義清虛洞組下部建立Arthricocephalus jishouensis-Changaspis plana帶,上部建立Protoryctocephalus wuxunensis帶。八郎“清虛洞組”未發(fā)現(xiàn)這些三葉蟲帶。八郎“清虛洞組”Protoryctocephalus arcticus帶的建立為修正該地區(qū)掘頭蟲類三葉蟲帶提供了極好的材料,為下一步在“清虛洞組”建立完善的掘頭蟲類三葉蟲帶打下基礎(chǔ)。
[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".
【學(xué)位授予單位】：貴州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：Q915

【參考文獻】

相關(guān)期刊論文 前3條

1 彭善池;;華南寒武系年代地層系統(tǒng)的修訂及相關(guān)問題[J];地層學(xué)雜志;2008年03期

2 趙元龍，，袁金良;貴州臺江中寒武統(tǒng)Olenoides一新種[J];古生物學(xué)報;1994年03期

3 楊興蓮;趙元龍;彭進;楊宇寧;楊凱迪;;貴州劍河寒武系清虛洞組掘頭蟲類三葉蟲的發(fā)現(xiàn)[J];高校地質(zhì)學(xué)報;2010年03期

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