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| 滇中武定迤纳厂铁铜矿床磁铁矿元素地球化学特征及其成矿意义 | |
| 引用本文： | 侯林,丁俊,邓军,彭惠娟.滇中武定迤纳厂铁铜矿床磁铁矿元素地球化学特征及其成矿意义[J].岩石矿物学杂志,2013,32(2):154-166. |
| 作者姓名： | 侯林 丁俊 邓军 彭惠娟 |
| 作者单位： | 1. 地质过程与国家资源重点实验室,中国地质大学地球科学与资源学院,北京100083;成都地质矿产研究所,四川成都610081 2. 成都地质矿产研究所,四川成都,610081 3. 地质过程与国家资源重点实验室,中国地质大学地球科学与资源学院,北京100083 4. 中国地质科学院矿产资源研究所,北京,100037 |
| 基金项目： | 中国地质调查局地调项目，云南武定地区铁铜矿远景调查资助项目 |
| 摘 要： | 武定迤纳厂矿床位于我国云南省中部,在大地位置上处于扬子板块西缘,康滇地轴云南段,是滇中具有代表性的元古代铁-铜-金-稀土矿床.其矿化作用分为岩浆气液期、交代成矿期、热液成矿期和成矿后热液期4个期次,其中前3个期次是铁成矿的主要期次,分别以角砾状磁铁矿、浸染状磁铁矿和粗粒脉状磁铁矿为代表.各类磁铁矿含有一定量的SiO2、Cr2O3、Al2O3、MgO等,角砾状磁铁矿石的主元素成分与铁成分比值最高,其次为浸染状磁铁矿,最低为脉状磁铁矿.不同类型的磁铁矿微量元素变化很大,浸染状磁铁矿稀土配分具四重效应,角砾状磁铁矿和粗粒脉状磁铁矿稀土配分为右倾型.成矿早期磁铁矿的形成受岩浆作用影响强烈,含铁的岩浆导致围岩碎裂,形成了早期角砾状矿石；交代成矿期的铁质主要源于岩浆演化晚期分异形成的富铁流体,富铁流体与围岩发生强烈的物质交换,导致大量铁质沉淀；随着矿化作用的进行,热液作用逐渐增强,加之外界流体的逐渐加入,对之前形成的磁铁矿进行改造,使其具有热液成因的表象特征.从矿物成分体现出的矿床成因上看,该矿床属于岩浆隐爆-交代型成因,与世界知名的IOCG型矿床有相似之处. |
| 关 键 词： | 磁铁矿 电子探针 ICP-MS 迤纳厂铁-铜-金-稀土矿床 滇中 IOCG |
| 收稿时间： | 2012/11/10 0:00:00 |
| 修稿时间： | 2013/1/14 0:00:00 |
Geochemical characteristics of magnetites from the Yinachang Fe-Cu-Au-REE deposit of Wuding area, central Yunnan Province, and their metallogenic significance |
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| HOU Lin,DING Jun,DENG Jun and PENG Hui-juan.Geochemical characteristics of magnetites from the Yinachang Fe-Cu-Au-REE deposit of Wuding area, central Yunnan Province, and their metallogenic significance[J].Acta Petrologica Et Mineralogica,2013,32(2):154-166. | |
| Authors: | HOU Lin DING Jun DENG Jun and PENG Hui-juan |
| Institution: | State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;Chengdu Institute of Geology and Mineral Resources, Chengdu 610081, China;Chengdu Institute of Geology and Mineral Resources, Chengdu 610081, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;Chinese Academy of Geological Sciences, Institute of Mineral Resources, Beijing 100037, China |
| Abstract: | The Yinachang deposit is located in central Yunnan Province and geotectonically lies along the southern Kangdian axis and on the southwest margin of the Yangtze block. It is a typical Proterozoic Fe-Cu-Au-REE deposit in this area. The ore-forming process can be divided into four stages: magma stage, metasomatism-mineralization stage, hydrothermal ore-forming stage and post-mineralization stage, among which the first 3 stages constituted the dominant period for the precipitation of Fe, represented respectively by breccia magnetite, disseminated magnetite and grained veinlet magnetite. Magnetite of the 3 kinds contains certain amounts of SiO2, Cr2O3, Al2O3 and MgO, and the breccia magnetite has the highest radio between major elements and Fe, foll-owed by disseminated magnetite and veinlet magnetite. Magnetites of different types show remarkable differences in trace elements content. The distribution of rare earth elements in disseminated magnetite has lanthanide tetrad effect, while the distribution of the breccia magnetite and the grained veinlet magnetite is right-oblique. The formation of the magnetite at Stage 1 was considerably controlled by magmatic activity, and the upwelling of Fe-hosting magma caused the deformation of wall rock and the precipitation of the breccia magnetite. Fe-bearing fluid was separated from the magma at the metasomatism stage, and went through a composition exchange with the wall rock, which led to the precipitation of large quantities of iron. The addition of outer fluid at the 3rd stage reformed the magnetite, making the magnetite more similar to that of hydrothermal origin. According to the composition of the magnetite, the deposit has a magma-metasomatism mechanism, similar to things of the IOCG deposit. |
| Keywords: | magnetite electron microprobe ICP-MS Yinachang Fe-Cu-Au-REE deposit central Yunnan IOCG |
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