浙赣皖相邻区与德兴、铜陵矿集区燕山期花岗岩类岩石对比研究及其成矿  

A comparison of Yanshanian granitoids between the Zhejiang-Jiangxi-Anhui border area and the Dexing and Tongling mineralization-concentated areas, with a discussion on mineralization

作　　者：赵海玲[1,2,3] 狄永军[1,2,3] 邓晋福[1,2,3] 王成[1,2,3] 戴圣潜[4] 莫兆[1,2,3] 

机构地区：[1]中国地质大学地质过程与矿产资源国家重点实验室 [2]中国地质大学岩石圈构造,深部过程及探测技术教育部重点实验室,北京100083 [3]中国地质大学地球科学与资源学院,北京100083 [4]安徽省地质调查院

出　　处：《岩石矿物学杂志》2007年第1期13-20,共8页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金资助项目(40234048)

摘　　要：浙赣皖相邻区与铜陵、德兴地区岩石系列相似,主要为高钾钙碱性系列;在岩石类型上,浙赣皖相邻区较德兴和铜陵地区两个矿集区的岩体偏酸性,主要岩石类型为二长花岗岩和花岗闪长岩,德兴地区和铜陵地区的主要岩石类型为花岗闪长岩和石英闪长岩。从浙赣皖相邻区→德兴地区→铜陵地区,岩体的里特曼指数逐渐增加,A/CNK逐渐减小,K/(K+Na)逐渐减小。在岩石化学特征上,浙赣皖相邻区较德兴和铜陵矿集区的岩体富Si、K,贫Mg、Fe、Ca等暗色矿物组分及Ti、P等不相容元素组分,从浙赣皖相邻区→德兴地区→铜陵地区岩石明显地向贫Si、K富Mg、Fe方向演化。在岩石成因类型上,浙赣皖相邻区岩石主要为I型花岗岩,个别为S型花岗岩,德兴和铜陵两个矿集区岩石均为Ⅰ型花岗岩,无S型。痕量元素、同位素特征及岩石学特征表明浙赣皖相邻区的物质来源以壳源为主,而德兴地区及铜陵地区为壳幔混合型或有大量幔源物质的参与,其原因可能与3个地区不同的构造背景有关。综合上述对比研究,认为在浙赣皖相邻地区要找到铜陵式的Cu矿和德兴式Cu、Mo矿的可能性较小。In rock series, Yanshanian intrusive rocks in the Zhejiang-Jiangxi-Anhui border area are similar to those in the Tongling and Dexing areas, being all high-K calc-alkaline series. In rock types, the rocks in the Zhejiang-Jiangxi-Anhui border area are more acid than those in the Tongling and Dexing mineralization-concentrated areas, i.e., the rocks in the former consist mainly of monzonitic granite and granodiorite, whereas those in the latter are granodiorite and quartz diorite. Rittman index gradually increases, A/CNK gradually decreases and K/K ＋ Na gradually decreases from the Zhejiang-Jiangxi-Anhui border area to the Dexing area, and then to the Tongling area. In petrologic chemistry, the intrusions in the Zhejiang-Jiangxi-Anhui border area are richer in Si and K than those in the Dexing and Tongling areas, with the evolution towards the depletion of Si and K from the Zhejiang-Jiangxi-Anhui border area to the Dexing area, and then to the Tongling area. The intrusions in the Zhejiang-Jiangxi-Anhui border area are depleted in Mg, Fe and Ca dark minerals and incompatible elements such as Ti and P. The intrusions evolved towards the depletion of Si, K and enrichment of Mg and Fe from the Zhejiang-Jiangxi-Anhui border area to the Dexing area, and then to the Tongling area. In original petrologic types, the rocks in the Zhejiang-Jiangxi-Anhui border area are mainly I-type monzonitic granite and dioritic granite, with very few samples belonging to S-type granite. There is no S-type granite in the Dexing and Tongling mineralization-concentrated areas. The trace elements, isotope features and petrologic features of the Zhejiang- Jiangxi-Anhui border area indicate that the source was mainly derived from the crust, whereas the source of the intrusions in the Dexing and Tongling areas from crust-mantle mixing, or from the entry of large amounts of mantle materials into magma. The Zhejiang-Jiangxi-Anhui border area is situated on the Jiangnan anticlise; the Dexing mineralization-concentrated area lies on the southeast si

关 键 词：浙赣皖相邻地区 燕山期花岗岩 成矿 德兴 铜陵矿集区 

分 类 号：P588.121[天文地球—岩石学] P612[天文地球—地质学]