云南会泽地区中二叠世叶状藻礁的发现及其古环境意义
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本文为中国地质调查局区域地质调查项目(编号:1212011220401;DD20160018)和国家自然科学基金项目(编号:41503025)的成果。


Discovery of the Middle Permian Phylloid Algal Reefs in Huize Area of Yunnan Province, and Its Palaeoenvironmental Significance
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    摘要:

    1∶50000区域地质调查发现云南会泽地区中二叠世阳新组中发育叶状藻礁。本文以碳酸盐岩微相分析为主要手段,对落水洞剖面阳新组进行了微相特征和沉积相研究。识别出7个沉积微相类型:含核形石有孔虫藻屑颗粒灰岩、有孔虫藻屑颗粒灰岩、叶状藻礁灰岩、腕足棘皮泥粒灰岩、棘皮藻屑泥粒灰岩、介形类棘皮粒泥灰岩和藻屑粒泥灰岩,和4种沉积亚相类型:较深水的滩间亚相、台内低能生屑滩亚相、台内叶状藻礁亚相和台内高能生屑滩亚相。叶状藻礁形成于相对海平面上升过程中,位于台内高能生屑滩下部。落水洞剖面整体发育于暖水的开阔碳酸盐台地,指示滇东北地区中二叠世位于温暖的古气候环境。

    Abstract:

    Objectives:Phylloid reefs are found in the Middle Permian Yangxin Formation in Huize County, Yunnan Province, based on the 1∶50000 regional geological survey. Their microfacies characteristics and sedimentary model is studied in this paper.Methods & Results: By the way of detailed microfacies analysis, Seven carbonate microfacies types are identified as follows: bioclastic (foraminifers and algae) grainstone containing oncolites, bioclastic (foraminifers and algae) grainstone, phylloid algal reef limestone, bioclastic (brachiopods and echinoderms) packstone, bioclastic (echinoderms and algae) packstone, bioclastic (ostracods and echinoderms) wackestone and bioclastic (algae) wackestone. Four sedimentary subfacies were determined, which are relative deep interbank subfacies, lowenergy bioclastic bank subfacies, phylloid algal reef subfacies and highenergy bioclastic bank subfacies.Conclusions: Phylloid algal reefs formed in the lower part of highenergy bioclastic bank subfacies, resulting from relative sealevel rise. Profile Luoshuidong section may develop in an open carbonate platform environment, indicating the northeastern Yunnan was in a warm palaeoclimatical environment during the Middle Permian.

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高永娟,林仕良,秦雅东,娄雄英,程锦翔.2018.云南会泽地区中二叠世叶状藻礁的发现及其古环境意义[J].地质论评,64(3):701-710,[DOI].
GAO Yongjuan, LIN Shiliang, QIN Yadong, LOU Xiongying, CHENG Jinxiang.2018. Discovery of the Middle Permian Phylloid Algal Reefs in Huize Area of Yunnan Province, and Its Palaeoenvironmental Significance[J]. Geological Review,64(3):701-710.

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  • 收稿日期:2017-06-27
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  • 在线发布日期: 2018-05-20
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