| 广西宜州裂陷槽晚古生代演化与早石炭世沉积锰矿分布* |
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| 引用本文： | 黄恒,颜佳新,余文超.广西宜州裂陷槽晚古生代演化与早石炭世沉积锰矿分布*[J].古地理学报,2020,22(5):1001-1011. |
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| 作者姓名： | 黄恒 颜佳新 余文超 |
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| 作者单位： | 1.广西第四地质队,广西南宁 530031;2.中国地质大学(武汉)地球科学学院,湖北武汉 430074 |
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| 基金项目： | *广西壮族自治区自然资源厅项目(编号: 桂自然资函〔2018〕377)和国家自然科学基金项目(编号: 41872117)共同资助 |
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| 摘 要： | 滇黔桂地区晚古生代浅水碳酸盐岩台地与深水硅泥质盆地共存的古地理格局,是在加里东期褶皱基底上发生裂陷及差异沉降而发展起来的。广西宜州—柳州一带既是晚古生代上扬子碳酸盐岩地台南缘1条重要的沉积相分界线,也是晚古生代桂中和桂北地层分区、古生代—中生代雪峰山南段构造体系和桂中坳陷构造体系的分界线。文中通过对宜山—柳州一带晚古生代地层的区域对比和成因分析,恢复了桂中宜山—柳州地区晚古生代沉积盆地的演化历史。狭长型宜州裂陷槽盆地西起丹池断裂,向东经龙头、北牙、宜州延伸至柳州。自中泥盆世开始,首先在东西两端开始裂陷下沉,至早石炭世发展成型。受北侧来自江南隆起带陆源碎屑物质充填影响,其表现为南北不对称并在早石炭世晚期被填平。在宜州裂陷槽内发育多处早石炭世沉积型碳酸锰矿,含矿地层分布、地层序列及其沉积背景明显与裂陷槽演化有关。它们既是盆地演化历史的见证,也体现了桂中地区裂陷海槽的特色,值得在后续锰矿成因研究中予以重视。
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| 关 键 词： | 宜州裂陷槽 石炭纪 古地理 盆地演化 沉积锰矿 |
| 收稿时间： | 2020-07-03 |
Evolution of Yizhou aulacogen in Guangxi during Late Paleozoic and distribution of manganese deposits in Early Carboniferous |
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| Huang Heng,Yan Jia-Xin,Yu Wen-Chao.Evolution of Yizhou aulacogen in Guangxi during Late Paleozoic and distribution of manganese deposits in Early Carboniferous[J].Journal of Palaeogeography,2020,22(5):1001-1011. |
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| Authors: | Huang Heng Yan Jia-Xin Yu Wen-Chao |
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| Institution: | 1.Geological Team No.4 of Guangxi Zhuang Autonomic Region,Nanning 530031,China;2.School of Earth Sciences,China University of Geosciences(Wuhan),Wuhan 430074,China |
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| Abstract: | The palaeogeographic configuration of the shallow water carbonate platform and deep water siliceous basin formed in the Yunnan-Guizhou-Guangxi region during the Late Paleozoic,which developed on the rifting of fold basement and differential subsidence during the Caledonian period. Yizhou-Liuzhou in Guangxi is an important sedimentary boundary in the southern Upper Yangtze carbonate platform. It is also the stratigraphic boundary of Late Paleozoic between middle and northern Guangxi,and it is the tectonic boundary between the southern Xuefengshan and central Guangxi depression during Paleozoic and Mesozoic. In this paper,the evolution of sedimentary basin located at Yishan-Liuzhou region during the Late Paleozoic is reconstructed through the regional stratigraphic correlation and genetic analysis.The elongate Yizhou rifting belt develops from the Nandan-Hechi fault from the west,and extends along Longtou,Beiya,Yizhou,and to Liuzhou. The rifting started at the eastern and western ends of the narrow rifting belt during the Middle Devonian and it developed into the rifting basin during the Early Carboniferous. Due to massive terrestrial siliciclastic filling derived from the Jiangnan Uplift to north,the rifting basin presented the asymmetrical feature and it was eventually filled up at late Early Carboniferous. Many magnesium deposits of Early Carboniferous are found in the rifting basin of Yizhou. The distribution of ore-bearing strata,the depositional succession and sedimentary environment are obviously related with the evolution of rifting basin. They are the evidences of basin evolution,implying the characteristics of rifting aulacogen in central Guangxi,which should be paid more attention in the manganese ore genesis study. |
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| Keywords: | Yizhou rifting basin Carboniferous palaeogeography basin development magnesium deposits |
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