引用本文:李静, 刘桂春, 孙载波, 胡绍斌, 刘兵, 刘军平, 黄亮, 朱勋早, 包佳凤, 曾文涛, 周坤, 段文婷.蛇绿混杂岩区1:5万填图工作方法研究--以云南省多条蛇绿混杂岩带的研究为例[J].沉积与特提斯地质,2022,42(1):1-16.[点击复制]
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蛇绿混杂岩区1:5万填图工作方法研究--以云南省多条蛇绿混杂岩带的研究为例
李静,刘桂春,孙载波,胡绍斌,刘兵,刘军平,黄亮,朱勋早,包佳凤,曾文涛,周坤,段文婷
0
(1. 云南省地质调查局, 云南 昆明 650051;
2. 国土资源部三江成矿作用及资源勘查利用重点实验室, 云南 昆明 650051;
3. 云南省地质调查院, 云南 昆明 650216;
4. 云南省自然资源厅, 云南 昆明 650224)
摘要:
近几年来,笔者依托大面积的1∶5万区域地质调查及新一轮《云南省区域地质志》(第二版,修编)工作,梳理了云南省内存在10条蛇绿混杂岩带,通过对比研究,获得了一系列全新的认识。蛇绿混杂岩代表了地质历史时期已经消失了的古大洋残迹。古大洋受俯冲作用被压缩在板块之间,形成具有代表不同构造古地理单元、不同成因的岩石构造的异地堆垛体——蛇绿混杂岩,其具有地质记录不完备性的特点。按其形成的构造古地理环境,可将蛇绿混杂岩的组成物质划分为地幔岩、洋中脊侵入岩浆杂岩、洋盆及洋内弧火山-沉积建造、外来岩片等4大类岩石组合。本文依托云南省多条典型的蛇绿混杂岩带岩石组合特征,将蛇绿混杂岩的4大类岩石组合按照具体的物质组成、岩石成因细分为13类岩石成因组合。通过对洋盆由扩张成盆向俯冲消亡转化的演化历史研究,提出了洋盆扩张鼎盛时期的3条判别标志:①远洋沉积物的广泛分布,也是沉积速率最低的地史时期;②前弧玄武岩的首次出现;③亚速尔型洋岛玄武岩向夏威夷型洋岛玄武岩的转化。此外,本文认为洋盆扩张的鼎盛时期确定为蛇绿混杂岩形成的主要时代。
关键词:  蛇绿混杂岩  洋盆演化历史  物质组成  填图工作方法  云南省
DOI:10.19826/j.cnki.1009-3850.2022.01020
附件
投稿时间:2021-09-30修订日期:2022-01-14
基金项目:国家自然科学基金项目(92055314,42162020)、中国地质调查局项目(DD20160345-02,DD20190370)
The new mapping method for geological survey of 1:50,000 in ophiolite mélange areas: A case study on ophiolite mélange zones in Yunnan, China
LI Jing, LIU Guichun, SUN Zaibo, HU Shaobin, LIU Bing, LIU Junping, HUANG Liang, ZHU Xunzao, BAO Jiafeng, ZENG Wentao, ZHOU Kun, DUAN Wenting
(1. Yunnan Bureau of Geological Survey, Kunming 650051, China;
2. Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization, Ministry of Natural Resources, Kunming 650051, China;
3. Yunnan Institute of Geological Survey, Kunming 650216, China;
4. Department of Natural Resources of Yunnan Province, Kunming 650224, China)
Abstract:
A new mapping method for geological survey of 1∶50, 000 in ophiolite mélange areas has been proposed in this paper, based on the detailed studies of 10 ophiolite mélange zones in regional geological survey of 1∶50, 000 in Yunnan and the authors' work experiences of the second-edition revision of Regional Geology of Yunnan in recent years. According to the structural paleo-geographic environments, ophiolite mélange zones can be divided into four categories of rock combinations: mantle rocks, mid-ocean ridge magmatic intrusion rocks, ocean basin and inner ocean arc volcanic deposition rocks, and foreign rock sheets. Based on the typical rock combination, the specific material composition and rock genesis, the four categories of rock combinations are subdivided into 13 sub-combinations of rocks, furthermore. Through the detailed study of the evolution from expansion to subduction of oceanic basins in study areas, it is proposed that the widespread distribution of pelagic sediments, the first appearance of the anterior arc basalts, and the transformation of Azores ocean island basalt to Hawaiian ocean island basalt are the three key discrimination marks of the expansion peak of an ocean basin.
Key words:  ophiolite mélange zone  evolution oceanic basin  petrogenesis-assemblages  geological mapping method  Yunnan Province

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