| 湘东南中生代典型成矿花岗岩对比及成矿动力学 |
| |
| 引用本文： | 童海奎,杨宏林,艾 昊,郭文波,韩 真,邢永强,王 斌.湘东南中生代典型成矿花岗岩对比及成矿动力学[J].地球科学与环境学报,2014(1):171-184. |
| |
| 作者姓名： | 童海奎 杨宏林 艾 昊 郭文波 韩 真 邢永强 王 斌 |
| |
| 作者单位： | [1]青海省地质调查局,青海西宁810001 [2]西北有色地质勘查局物化探总队,陕西西安710068 |
| |
| 基金项目： | 国土资源部公益性行业科研专项项目（201111007-3） |
| |
| 摘 要： | 湘东南矿集区是南岭成矿带的重要组成部分。选取该矿集区内典型矿床的成矿花岗岩,利用成岩年龄、主量和微量元素组成、蛛网图及稀土元素配分模式等进行对比。结果表明:该矿集区内中生代成矿花岗岩的成岩年龄集中在150~165Ma。根据地球化学组成可将该矿集区内的成矿花岗岩分为2类:一类以骑田岭为代表,岩性以黑云母二长花岗岩为主,属于A型花岗岩,其分异程度较高,高w(Rb)/w(Sr)值,低w(K)/w(Rb)值,成矿元素以高温的W、Sn为主,具有富硅,富碱,贫P、Ti、Mg的特点,Ba、Sr、P、Eu、Ti负异常明显;另一类以宝山岩体为代表,其岩体产状为小岩株,岩性以花岗闪长岩为主,属于I型花岗岩,分异程度较低,低w(Rb)/w(Sr)值,高w(K)/w(Rb)值,Ba、Sr、P、Eu、Ti负异常不明显,其地球化学性质与岛弧岩浆类似,成矿元素以中低温的Cu、Pb、Zn等为主。黄沙坪花岗岩的成矿特征处于第一类与第二类岩体之间,属于过渡类型。结合矿集区所在的大地构造位置及其构造演化史,认为湘东南矿集区的形成与壳-幔相互作用密切相关,是后造山作用与大洋板块俯冲共同作用的结果。
|
| 关 键 词： | 地球化学 壳-幔相互作用 成矿花岗岩 成岩年龄 大洋板块俯冲 后造山作用 湖南 |
Comparison of Mesozoic Typical Ore-related Granites in the Southeastern Hunan and Their Tectonic Dynamic Setting |
| |
| TONG Hai-kui,YANG Hong-lin,AI Hao,GUO Wen-bo,HAN Zhen,XING Yong-qiang,WANG Bin.Comparison of Mesozoic Typical Ore-related Granites in the Southeastern Hunan and Their Tectonic Dynamic Setting[J].Journal of Earth Sciences and Environment,2014(1):171-184. |
| |
| Authors: | TONG Hai-kui YANG Hong-lin AI Hao GUO Wen-bo HAN Zhen XING Yong-qiang WANG Bin |
| |
| Institution: | 1. Qinghai Bureau of Geological Survey, Xining 810001, Qinghai, China; 2. Geophysical and Geochemical Exploration Team, Northwest Mining and Geological Exploration Bureau for Nonferrous Metals, Xi＇an 710068, Shaanxi, China) |
| |
| Abstract: | The ore concentration area in the southeastern Hunan is important for Nanling metallogenic belt.According to diagenetic age, composition of major-trace elements, spider diagrams and REE pattern,ore-related granites of typical deposit from the ore concentration area were selected and compared.The results show that the diagenetic ages of Mesozoic ore-related granites are mainly 150-165 Ma.According to the geochemical constituent,ore-related granites in the ore concentration area can be divided into two categories：firstly,the representative granite is Qitianling,lithology is mainly biotite adamellite,the plutons belong to A-type granite with high differentiation,w（Rb）/w（Sr）is high with low w（K）/w（Rb）,metallogenic elements are mainly hyperthermal W and Sn,the characteristics are rich in SiO2 and alkali,and poor in P,Ti and Mg, and negative anomalies of Ba, Sr, P, Eu and Ti are significantly;for another one, the＆amp;nbsp;representative granite is Baoshan,the occurrence of pluton is small laccolith,lithology is mainly granodiorite,the plutons belong to I-type granite with low differentiation,w（Rb）/w（Sr）is low with high w （K）/w （Rb）,negative anomalies of Ba,Sr,P,Eu and Ti are not obvious,the geochemical characteristics is similar to arc magma,and the metallogenic elements are mainly hypothermal Cu,Pb and Zn.The metallogenic characteristic of Huangshaping granite belong to the transitional type,which is between the above two kinds of ore-related granites.Combined with the tectonic background and history in the ore concentration area,the formation of ore concentration area in the southeastern Hunan is closely related to the mantle-crust interaction under the joint action of oceanic plate subduction and post-orogeny. |
| |
| Keywords: | geochemistry mantle-crust interaction ore-related granite diagenetic age oceanic plate subduction post-orgogeny Hunan |
| 本文献已被 CNKI 维普 等数据库收录！ |
|
