中国地质2012，Vol.39Issue(6)：1874-1884,11.
宁芜火山岩盆地凹山铁矿床侵入岩锆石微量元素特征及其地质意义
Zircon trace element characteristics of intrusions in the Washan iron deposit of Ningwu volcanic basin and their geological significance
摘要
Abstract
The Washan iron deposit is a representative porphyrite iron deposit. There are two types of intrusions: One is gabbro-diorite porphyrite closely related to the iron mineralization and serves as the host rocks, and the other is granodiorite porphyry cutting across the ore body, which has been rarely studied. Detailed zircon LA-ICP-MS trace element measurement was performed on these two intrusions. The two intrusions have similar chondrite-normalized REE patterns of zircons and Yb, Hf and Y values, whereas zircons from the granodiorite porphyry have higher U values and U/Yb ratios. In combination with previous studies of isotope geochemistry, the authors infer that these intrusions have similar sources, and much crust material was involved in the formation of granodiorite porphyry during the ascending process. Zircon Ce(Ⅳ)/Ce(Ⅲ)ratios of the granodiorite porphyry are concentrated in the range of 0-100, lower than the values of zircons (>300) from the granite related to the porphyry Cu-Au mineralization; nevertheless, they have similar characteristics of δ Eu (>0.4). Thus, it is not certain whether the granodiorite porphyry had the potential to form copper and gold deposits, and hence further researches are needed concerning the possible relationship between the granitic stocks and copper and/or gold mineralization.关键词
锆石微量元素/Ce(Ⅳ)/Ce(Ⅲ)比值/凹山/玢岩铁矿/宁芜Key words
trace element of zircons/ Ce(Ⅳ)/Ce(Ⅲ) ratio/ porphyry iron deposit/ Washan/ Ningwu分类
天文与地球科学引用本文复制引用
段超,李延河,毛景文,侯可军,袁顺达..宁芜火山岩盆地凹山铁矿床侵入岩锆石微量元素特征及其地质意义[J].中国地质,2012,39(6):1874-1884,11.基金项目
公益性行业科研专项项目(200911007,200811114)、国家自然科学重点基金项目(40930419),国家重点基础研究发展计划项目(2007CB411405)和地质过程与矿产资源国家重点实验室开放基金项目(GPMR201029)联合资助. （200911007,200811114）
