滇东南石炭系坝达组对比和南盘江晚古生代大洋板块演化  

Correlation of Carboniferous Bada Formation in southeastern Yunnan andevolution of Nanpanjiang Ocean Plate in Late Paleozoic

作　　者：赵云江 包佳凤 李维科 何世军[6] 刘军平 赵巧珍 田应贵 王晓林 ZHAO Yunjiang;BAO Jiafeng;LI Weike;HE Shijun;LIU Junping;ZHAO Qiaozhen;TIAN Yinggui;WANG Xiaolin(Yunnan Institute of Geological Survey,Kunming,650216;School of Earth Science and Resources,China University of Geosciences,Beijing,100083;Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization,MNR,Kunming,650051;The Third Nonferrous Geology Corps of Guizhou Province,Zunyi,Guizhou,563000;Yunnan Institute of Geology and Mineral Resources Exploration,Kunming,650051;The Second Geological Institute of China Metallurgical Geology Bureau,Fuzhou,350108)

机构地区：[1]云南省地质调查院,昆明650216 [2]中国地质大学地球科学与资源学院,北京100083 [3]自然资源部三江成矿作用及资源勘查利用重点实验室,昆明650061 [4]贵州省有色地质三总队,贵州遵义563000 [5]云南省地质矿产勘查院,昆明650051 [6]中国冶金地质总局第二地质勘查院,福州350108

出　　处：《地质论评》2023年第4期1269-1284,共16页Geological Review

基　　金：云南省技术创新人才培养对象资助项目(编号:202305AD160031);云南省1:5万万寿山幅等四幅区域地质调查资助项目(编号:D201904);云南1:5万大庄幅、法裱幅、底土幅、甸中幅4幅区域地质调查资助项目(编号:D202207)的成果~~。

摘　　要：右江盆地上世纪末发现了桂西晚古生代海相(洋岛)玄武岩,近期亦有报道。洋盆、洋脊玄武岩是判断洋岛存在的先行条件。滇东南坝达、里呼一带下石炭统的坝达组(C1b)主要为灰黑、灰白色薄层硅质岩、放射虫硅质岩、海绵骨针硅质岩、玄武岩夹凝灰岩、泥晶灰岩、泥岩,具有典型的硅质岩—玄武岩—灰岩—泥岩组合的洋盆沉积建造,含牙形石、三叶虫等。该组喷发于他披组之上的基性—超基性熔岩,具有显著的大洋拉斑玄武岩特征。因此,坝达组的划分和对比为研究右江盆地晚古生代—中三叠世的多岛洋盆环境提供了重要的依据,对研究华夏造山带与扬子陆块的拼贴过程具有十分重要的科学意义。Objectives: Late Paleozoic marine (Oceanic island) basalt in western Guangxi was discovered in YoujiangBasin at the end of last century, which has also been reported recently. The basalt of ocean basin and ocean ridgeis the precondition to judge the existence of ocean island.Results: Through 1 ∶ 50000 regional geological survey and profile study, The Lower Carboniferous BadaFormation (C1b) in the Bada and Lihu areas of southeast Yunnan is mainly composed of grayish black and grayishwhite thin bedded siliceous rocks, radiolarian siliceous rocks, spongy spicule siliceous rocks, basalt with tuff,micritic limestone and mudstone, with typical ocean basin sedimentary construction composed of siliceous rocksbasalt limestone mudstone, including conodonts, trilobites, etc.Conclusions: The basic—ultrabasic lavas erupted on the Tapi Formation have obvious characteristics ofoceanic tholeiite. Therefore, the division and correlation of the Bada Formation provides an important basis for thestudy of the Late Paleozoic—Middle Triassic island ocean basin environment in the Youjiang Basin, and is of greatscientific significance for the study of the splicing process between the Cathaysian orogenic belt and the YangtzeBlock.

关 键 词：放射虫—海绵骨针硅质岩 洋盆建造 坝达组 早石炭世 洋板块地层 滇东南里呼 

分 类 号：P534.45[天文地球—古生物学与地层学] P542[天文地球—地质学]