西藏保吉地区晚侏罗世珊瑚动物群的发现及其意义
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国家自然科学基金项目(编号41472030);科技基础性工作专项(编号2015FY310100);中国地质调查局项目 (编号12120115069001、1212011120142、1211402108021-2、1212011120115);基本科研业务费项目(编号J1313、J1307)


Discovery of the Late Jurassic Coral Fauna in the Baoji Area, Tibet and Its Significance
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    摘要:

    西藏班戈县纳木错西岸的保吉地区新发现了晚侏罗世牛津期-基默里奇期珊瑚化石14属21种及未定种。它们分别是:Goniocora cf. annulata Roniewicz, Calamophylliopsis cf. moreauna (Michelin),Thecosmilia ? sp.,Calamophylliopsis ? sp.,Micrabacia ? sp.,Stylosmilia michelini M.-Edwards et Haime,Cladophyllia turbinata (Gregory),Cladophyllia ? sp.,Thamnasteria ? sp.,Ovalastraea ? sp.,Montlivaltia ? sp.,Latiastraea goldfussi (Koby),Donacosmilia cf. silinensis Liao,Thecosmilia baingoinensis sp. nov.,Placophyllia cf. rugosa Becker,Cladophyllia rollieri Koby,Thecosmilia cf. costata Fromentel,Goniocora ? sp.,Pleurocora crassa (Reuss),Calamophylliopsis moreauna (Michelin),Trocharaea ? sp.等。这些珊瑚表明其所在地层的时代不是中二叠世,因此不能划为中二叠统下拉组。通过与已有上侏罗统岩石地层单位的对比分析,笔者将该套地层对比于吐卡日组。本次吐卡日组的发现证明了保吉地区的上侏罗统并非缺失,而是礁滩相碳酸盐岩地层。这一发现进一步表明了措勤盆地上侏罗统并非缺失、或者是以接奴群、或者是拉贡塘组。这一发现证明了措勤盆地内分布有上侏罗统礁滩相碳酸盐岩地层。这一发现为开展措勤盆地礁滩相上侏罗统的油气勘探工作提供了地层古生物学证据,因此,笔者建议将上侏罗统吐卡日组作为措勤盆地新的油气勘探目标层系。

    Abstract:

    14 genus 21 species late Jurassic Oxfordian-Kimmeridgian corals were first discovered to the west bank of Nam Co, Baoji area, Tibet. These corals are Goniocora cf. annulata Roniewicz, Calamophylliopsis cf. moreauna (Michelin),Thecosmilia ? sp.,Calamophylliopsis ? sp.,Micrabacia ? sp.,Stylosmilia michelini M.-Edwards et Haime,Cladophyllia turbinata (Gregory),Cladophyllia ? sp.,Thamnasteria ? sp.,Ovalastraea ? sp.,Montlivaltia ? sp.,Latiastraea goldfussi (Koby),Donacosmilia cf. silinensis Liao,Thecosmilia baingoinensis sp. nov.,Placophyllia cf. rugosa Becker,Cladophyllia rollieri Koby,Thecosmilia cf. costata Fromentel,Goniocora ? sp.,Pleurocora crassa (Reuss),Calamophylliopsis moreauna (Michelin),Trocharaea ? sp.. These corals indicate that the yielding strata is not middle Permian Xiala Formation(Ft) as it was thought previously. The yielding strata are correlated to be the late Jurassic Tukari Ft on basis of this study. This discovery indicates that the Upper Jurassic in the Baoji area is not missing. Furthermore,the discovery of the Tukari Ft in the Baoji area indicates that the Upper Jurassic in the Coqên Basin is not missing, or is not represented by the Jienu Group which is characteristic by the shallow-sea detrital rocks, or is not represented by the Lagongtang Ft which is outcropped nearby and characteristic by shale and silty shale. It indicates that the Upper Jurassic in the Coqên Basin is characteristic by the reef facies carbonate rock. The discovery of the Tukari Ft increases the value of oil and gas exploration of the Coqên Basin because that it provides critical stratigraphic evidence for the existence of the Late Jurassic reef facies carbonate rock. The Tukari Ft is suggested to be treated as the new target strata for the oil and gas exploration in the Coqên Basin.

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孟亚洲,纪占胜,廖卫华,姚建新,武桂春,孙倩,武振杰.2016.西藏保吉地区晚侏罗世珊瑚动物群的发现及其意义[J].地质学报,90(5):833-847.
MENG Yazhou, JI Zhansheng, LIAO Weihua, YAO Jianxin, WU Guichun, SUN Qian, WU Zhenjie.2016. Discovery of the Late Jurassic Coral Fauna in the Baoji Area, Tibet and Its Significance[J]. Acta Geologica Sinica,90(5):833-847.

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  • 收稿日期:2016-04-07
  • 最后修改日期:2016-04-18
  • 录用日期:2016-04-20
  • 在线发布日期: 2016-05-18
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