| 拉巴灰岩:深水碳酸盐沉积成因的认识及其意义 |
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| 引用本文： | 周志澄,方宗杰,郭震宇.拉巴灰岩:深水碳酸盐沉积成因的认识及其意义[J].地层学杂志,2000,24(3):190-194. |
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| 作者姓名： | 周志澄 方宗杰 郭震宇 |
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| 作者单位： | [1]中国科学院南京地质古生物研究所,江苏南京 [2]云南省地质局区调队,云南玉溪 |
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| 基金项目： | 国家自然科学基金项目!(No.49672 14 7)研究成果之一 |
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| 摘 要： | 滇西二叠系拉巴组中的拉巴灰岩的成因长期以来曾引起广泛争议。对拉巴灰岩的产状、结构构造及碳酸盐微相特征的研究表明 ,拉巴灰岩最初形成于浅水碳酸盐台地 ,由于突发的地质事件 ,被搬运至深水 ,半深水环境中沉积下来。拉巴灰岩的出现 ,证明在二叠纪 ,昌宁—孟连洋盆与相邻的陆棚之间 ,有陡峻的陆棚边棱存在。
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| 关 键 词： | 云南 二叠系 拉巴组 拉巴灰岩 深水—半深水沉积 |
| 文章编号： | 0253-4959(2000)03-0190-05 |
| 修稿时间： | 1999-09-17 |
Laba Limestone: Recognition of Origin of Deep-water Carbonate Deposits and it's Significance |
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| ZHOU Zhi-cheng,FANG Zong jie,GUO Zhen yu,WANG Yu jing,.Laba Limestone: Recognition of Origin of Deep-water Carbonate Deposits and it's Significance[J].Journal of Stratigraphy,2000,24(3):190-194. |
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| Authors: | ZHOU Zhi-cheng FANG Zong jie GUO Zhen yu WANG Yu jing |
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| Institution: | ZHOU Zhi-cheng
,FANG Zong-jie
,GUO Zhen-yu
,WANG Yu-jing
(Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing , 210008)XIAO Yin-wen
(Regional Surveying Team of Geological Bureau of Yunnan, Yuxi, 653100) |
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| Abstract: | The interpretation of the origin of the Laba Limestone in the Permian Laba Formation in western Yunnan has been controversial for a long time. One viewpoint regards it as allodapic melanges body and the other considers it as normal autochthonous limestone . Abundant shallow water bioclasts including echinoderms, foraminifers, fusulinids, brachiopods, bryozoans, gastropods, calcareous algae (blue green algae and green algae) in the Laba Limestone are predominating over other grain types (ooids, intraclasts etc.). The diagenetic characters of the Laba Limestone also show that it was originally deposited in a shallow water environment. The isolated Laba Limestone occurs in the red mudstone, silicilith and muddy siltstone deposited in deep or semi deep water environments. The occurrence and features of structures of the Laba Limestone indicate that it was transported to deep or semi deep water environments by collapsing or slumping along the submarine channels. The Laba Limestone containing Triticites in the Haibang section of Ali of Lancang County was probably produced in the Qixia time of early Permian age but the Laba Limestone containing Newschwagerina around Nanpan of Laba of Lancang County was seemingly formed in the Maokou time of Middle Permian age. The origin of Laba Limestone can be used to infer the occurrence of the abrupt edge between the Changning-Menglian ocean and the adjacent shelf. |
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| Keywords: | Yunnan Permian Laba Formation Laba Limestone deep-semi deep water deposition |
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