Stratigraphic correlation of the Givetian (late Middle Devonian) deposits in Qujing,Yunnan, southwestern China and the paleogeographic implications

IF 1.3 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Turkish Journal of Earth Sciences Pub Date : 2022-01-01 DOI:10.55730/1300-0985.1773
Jianhua Wang, Yunchuan Mi, X. Ma, Yukun Bi
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Abstract

: Detailed description of spatio-temporal framework of fossil-bearing strata is of fundamental significance for understanding the evolution of organisms and regional tectonics. The Qujing and Haikou formations are two lithological units exposed in eastern Yunnan, southwestern China, and both bear rich fossils indicative of a Middle Devonian age, while their relationship or lateral correlation remains unclear. Based on detailed observations of outcrops of these two formations in Qujing, eastern Yunnan, and as well as their typical rock characteristics and fossil contents, we propose that the two formations are basically contemporaneous heterotopic facies. From north to south of the Qujing area, the transition from the Haikou Formation to the Qujing Formation is gradual and shows an increase of carbonate component (in terms of the cumulative thickness of carbonate rocks) and as offset, a decrease of the siliciclastic component. The distribution of the Haikou/Qujing Formation indicates the development of a marine environment in the Qujing area during the Givetian, as a part of the South China Sea connected to the Paleo-Tethys Ocean
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云南曲靖中泥盆世晚期给田沉积地层对比及其古地理意义
详细描述含化石地层的时空格局对认识生物演化和区域构造具有重要意义。曲靖组和海口组是云南东部暴露的两个岩性单元,均具有丰富的中泥盆世化石,但它们之间的相互关系或横向对比尚不清楚。通过对滇东曲靖两组露头的详细观察,结合其典型岩石特征和化石含量,认为两组基本为同生异位相。从曲靖地区北至南,海口组向曲靖组的过渡是渐进的,碳酸盐组分(以碳酸盐岩累积厚度计)增加,而相抵消的是硅屑组分减少。海口组/曲靖组的分布表明,曲靖地区在Givetian时期的海洋环境发育,是与古特提斯洋相连的南海的一部分
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来源期刊
Turkish Journal of Earth Sciences
Turkish Journal of Earth Sciences 地学-地球科学综合
CiteScore
2.40
自引率
10.00%
发文量
6
审稿时长
6 months
期刊介绍: The Turkish Journal of Earth Sciences is published electronically 6 times a year by the Scientific and Technological Research Council of Turkey (TÜBİTAK). It is an international English-language journal for the publication of significant original recent research in a wide spectrum of topics in the earth sciences, such as geology, structural geology, tectonics, sedimentology, geochemistry, geochronology, paleontology, igneous and metamorphic petrology, mineralogy, biostratigraphy, geophysics, geomorphology, paleoecology and oceanography, and mineral deposits. Contribution is open to researchers of all nationalities.
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