TRANSFORMATION OF MESOZOIC TECTONIC DOMAIN AND ITS RELATION TO MINERALIZATION IN SOUTHEASTERN CHINA: AN EVIDENCE OF SOUTHWESTERN FUJIAN PROVINCE
-
摘要: 对中国东南大陆的重要构造及成矿单元———闽西南坳陷带及其外围的系统研究表明, 东南大陆在印支晚期至燕山早期存在从特提斯-喜马拉雅构造域向环太平洋构造域转换, 从而导致该区深部地球物理特征、构造-岩浆岩带展布、岩相古地理的演化、构造系统及区域成矿作用等方面发生明显的变化.构造系统分析表明, 该区构造格局的形成是在两大构造域相互复合、转换及叠加过程中完成的, 构造域转换的地球动力学机制主要是该区岩石圈横向及纵向上的不均一性及壳幔的相互作用.成矿作用及成矿年龄的研究表明, 伴随构造域的转换, 东南大陆在印支晚期至燕山早期应存在一期重要的多金属成矿作用.Abstract: The systematic study of the depression belt in southwestern Fujian Province, one of the most significant tectonic and metallogenic unit in southeastern China, shows that the transformation from Tethyan Himalayan tectonic domain into circum Pacific tectonic domain in southeastern China from the Late Indo Chinese to the Early Yanshanian induced obvious changes in geophysics, tectono magmatic distribution, lithofacies and paleo geography, tectonic system and regional mineralization. Tectonic system analysis indicates that the tectonic regime in this area resulted from the amalgamation, transformation and superimposition between the two tectonic domains. The geodynamic mechanism of the transformation is mainly attributed to the latitudinal and longitudinal heterogeneities of lithosphere and to the interaction between crust and mantle. The analysis of the mineralization and that of the mineralization age show that the transformation of the tectonic regime was accompanied by one significant phase of the multi metal mineralization that should have occurred during the Late Indo Chinese to the Early Yanshanian in southeastern China.
-
图 1 闽西南地区燕山期花岗岩体平均Kn值分布(据文献[10]修改)
Fig. 1. Distribution map showing the average Kn value of Yanshanian granite pluton in southwesten Fujian Province
图 2 闽西南地区晚泥盆世(a) 和早三叠世(b) 岩相古地理略图
a.1.古陆; 2.砂砾岩-粉砂岩-泥岩-页岩组; 3.砂砾岩组; 4.等厚线, m; 5.岩相界线; 6.滨海边滩相; 7.滨海盆地相.b.1.砂岩-粉砂岩组; 2.页岩-砂岩-粉砂岩组; 3.等厚线, m; 4.岩相界线; 5.潮间坪相; 6.潮间盆地相
Fig. 2. Lithofacies and paleogeographical maps of Late Devonian (a) and Early Triassic in southwestern Fujian Province
图 3 闽西南地区晋宁—加里东期构造的力学解析
Fig. 3. Mechanics analysis of structure of Jinning-Caleodonian in southwestern Fujian Province
图 4 闽西南构造与矿床分布关系
Fig. 4. Map showing the relationship between tectonics and deposits in southwestern Fujian Province
-
[1] 李四光. 地质力学概论[M]. 北京: 科学出版社, 1973. [2] 黄汲清. 中国主要地质构造单位[M]. 北京: 地质出版社, 1954. [3] 谢家荣. 中国东南地区大地构造主要特征[A]. 见: 陈国达, 郭令智, 张伯声, 等编. 中国大地构造问题[C]. 北京: 科学出版社, 1965.15 1~16 4. [4] 任纪舜. 中国东部及邻区大陆岩石圈构造演化与成矿[M]. 北京: 科学出版社, 1990. [5] 李继亮. 东南大陆岩石圈结构与地质演化[M]. 北京: 冶金工业出版社, 1993. [6] 黄汲清. 中国及邻区特提斯海的演化[M]. 北京: 地质出版社, 1987. [7] 马杏垣. 中国岩石圈动力学纲要———1∶40 0万中国及邻区海域岩石圈动力学图说明书[M]. 北京: 地质出版社, 1987. [8] 刘建华, 刘福田, 吴华, 等. 中国南北带地壳和上地幔的三维速度图象[J]. 地球物理学报, 1989, 32 (2): 143~152. https://www.cnki.com.cn/Article/CJFDTOTAL-DQWX198902003.htm [9] 邓晋福. 中国大陆根-柱构造———大陆动力学的钥匙[M]. 北京: 地质出版社, 1996. [10] 福建省地质矿产局. 福建省区域地质志[M]. 北京: 地质出版社, 1985. [11] 万天丰. 中国东部中新生代板内变形构造应力场及其应用[M]. 北京: 地质出版社, 1993. [12] Mao J W, Chen Y C. Scientia geologica sinica[M]. Beijing: Science Press, 1995. [13] 张达, 吴淦国, 陈金水, 等. 龙岩中甲锡多金属矿床地质特征及成因机理[J]. 有色金属勘查, 1993, (3): 129~135. https://www.cnki.com.cn/Article/CJFDTOTAL-YSJS903.000.htm -
下载:
点击查看大图
计量
- 文章访问数: 469
- HTML全文浏览量: 523
- PDF下载量: 14
- 被引次数: 0
