Ostracods from the Emuha Section of Devonian-Carboniferous Transitional in Western Junggar
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摘要: 为进一步丰富新疆西准噶尔地区泥盆纪-石炭纪(D-C)之交古生物地层资料，为研究区泥盆和石炭系划分、古环境重建提供新的证据，经野外采样、室内处理等工作，首次报道了西准噶尔俄姆哈地区D-C之交介形类9属12种(包括1新种)：Cavellina sublatiovata, C.cf.obesa, C.sp., Glyptopleura sp., Healdianella renalata, H.sp., Bairdiocypris vafra, Bairdia sp., Rectobairdia sp., Fabalicypris sp., Youngiella calvata, Coelonella xizhunensis sp.nov..根据介形类生物地层，并参照共生的其他门类化石，认为西准噶尔俄姆哈剖面至少在第3层就进入了早石炭世，进一步证明了洪古勒楞组的时代应该是晚泥盆世-早石炭世.介形类的古生态研究表明，西准噶尔俄姆哈地区是火山岛弧区在火山间歇期的近岸浅水沉积环境.Abstract: To provide new evidences for the stratigraphic division of Devonian and Carboniferous as well as paleoenvironmental reconstruction of western Junggar, Xinjiang, NW China. The biostratigraphic data of Devonian-Carboniferous boundary (D-C) has been explored in this study by field sampling and laboratory analysis in western Junggar. 12 ostracod species (including 1 new species) from the Devonian-Carboniferous in the Emuha section of western Junggar are first described and presented. It is found that they belong to 9 genera, including Cavellina sublatiovata, C.cf. obesa, C. sp., Glyptopleura sp., Healdianella renalata, H. sp., Bairdiocypris vafra, Bairdia sp., Rectobairdia sp., Fabalicypris sp., Youngiella calvata, Coelonella xizhunensis sp. nov.. The stratigraphical distribution of ostracods in the Emuha section suggests that the Hongguleleng Formation should be Late Devonian to the Early Carboniferous in age. In terms of paleoecology, the retrieved ostracods indicate an off-shore environment during intermittent periods of volcanic activities in volcanic arc zone.
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Key words:
- ostracod /
- Devonian-Carboniferous /
- western Junggar /
- stratigraphy /
- sedimentology
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图 1 西准噶尔俄姆哈剖面交通位置
中国地图据中华人民共和国地图(1∶22 000 000)，星球出版社，2010年第一版
Fig. 1. Sketch showing location of the Emuha section in western Junggar, NW China
图 2 西准噶尔俄姆哈剖面野外景观(a)和实测地层剖面(b)
0~9.见文中实测剖面特征描述
Fig. 2. The field photograph (a) and the measured stratigraphic profile (b) of the Emuhua section from western Junggar
图 3 西准噶尔俄姆哈剖面泥盆纪-石炭纪之交地层层序介形类分布
Fig. 3. Stratal sequence ostracods distribution from the Emuha section, western Junggar
图 4 西准噶尔俄姆哈剖面介形类-Ⅰ
a、b.光面年轻介Youngiella calvata Green近模的左视和背视.登记号：2014016；c~e.雕肋介(未定种)Glyptopleura sp.c、d.图示标本左视和右视.登记号：2014002；e.图示标本背视.登记号：2014003；f~h.西准小囊介(新种)Coelonella xizhunensis sp.nov.f.副模的右视.登记号：2014032；g、h.正模的右视和背视.登记号：2014017；i、j.豆星介(未定种)Fabalicypris sp.图示标本的右视和背视.登记号：2014027；k、l.直土菱介(未定种)Rectobairdia sp.k.图示标本的背视.登记号：2014024；l.图示标本的左视.登记号：2014025；m~o.灵巧巴尔德金星介Bairdiocypris vafra m.近模的左视.登记号：2014028；n、o.近模的右视和背视.登记号：2014029
Fig. 4. Ostracods (Ⅰ) from the Emuha section in western Junggar
图 5 西准噶尔俄姆哈剖面介形类-Ⅱ
a、b.近宽卵卡味尔介Cavellina sublatiovata Zhang近模左视、背视.登记号：2014001；c.肥胖卡味尔介(比较种)Cavellina cf.obesa Wang图示标本右视.登记号：2014008；d~f.卡味尔介(未定种)Cavellina sp.；d.图示标本的背视.登记号：2014011；e、f.图示标本的腹视和右视.登记号：2014007；g、h.肾形小赫鲁特介Healdianella renalata Li近模的背视和右视.登记号：2014012；i、j.小赫鲁特介(未定种)Healdianella sp.i.近模的右视.登记号：2014009；j.近模的背视.登记号：2014010；k、l.土菱介(未定种) Bairdia sp.图示标本的背视和右视.登记号：2014021
Fig. 5. Ostracods (Ⅱ) from the Emuha section in Western Junggar
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