塔前—赋春成矿带红梅岭花岗斑岩地球化学特征与成矿潜力

发布时间：2018-11-06 17:19

【摘要】：近年来,在赣东北塔前-赋春成矿带红梅岭花岗斑岩及其蚀变围岩中见有较好的铜、金矿化线索,值得进一步开展找矿工作。本次研究在详实野外调查的基础上,对该地区花岗斑岩进行岩相学、岩石地球化学分析。结果表明:红梅岭花岗斑岩具有高硅铝、相对富钠贫钾的特点,属过铝质钙碱性系列;微量元素表现为强烈富集Rb、U、Th、K等大离子亲石元素,亏损Nb、Ta、Ba、Sr、P、Ti等元素;稀土元素表现为稀土总量偏低、相对富集轻稀土、强Eu异常、具类似M型四分组效应的特征。红梅岭花岗斑岩形成于162.17±0.81 Ma,而同时期华南地区发生的大规模成岩-成矿事件在塔前-赋春成矿带中形成大量Cu、W、Mo多金属矿床,成矿时代多在161~155Ma。对比分析认为,处于同时期相似构造背景下的红梅岭花岗斑岩区亦具有找寻Cu、W多金属矿的潜力。
[Abstract]:In recent years, there are good cues of copper and gold mineralization in Hongmeiling granitic porphyry and its altered surrounding rock of the Qianqian Fuchun metallogenic belt in the north of Jiangxi Province, which is worthy of further exploration. On the basis of detailed field investigation, the petrographic and petrogeochemical analysis of granitic porphyry in this area is carried out. The results show that the Hongmeiling granitic porphyry belongs to the peraluminous calc-alkaline series because of its high Si-Al, relatively rich sodium and poor potassium. The trace elements are strongly enriched in large ion lithophile elements such as Rb,U,Th,K and depleted in elements such as Nb,Ta,Ba,Sr,P,Ti. The rare earth elements are characterized by low total amount of rare earth, relative enrichment of light rare earths and strong Eu anomaly, which are similar to M-type four-group effect. The Hongmeiling granitic porphyry was formed in 162.17 卤0.81 Ma, while the large-scale diagenesis and metallogenic events occurred in South China during the same period, and a large number of Cu,W,Mo polymetallic deposits were formed in the Tarim-Fuchun metallogenic belt, most of which occurred in 1611 ~ 155 Ma. The comparative analysis shows that the Hongmeiling granitic porphyry area, which is in the similar tectonic setting of the same period, also has the potential to look for Cu,W polymetallic deposits.
【作者单位】：南京大学地球科学与工程学院;江西省地质矿产勘查开发局九一二大队;
【基金】：江西省地质勘查基金项目(编号:20130130;20150011) 江西省科技计划项目(编号:20122BBG70068) 国土资源部公益性科研项目(编号:201411035)
【分类号】：P618.2

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