西天山智博铁矿地球化学特征及地质意义

发布时间：2018-02-05 05:00

本文关键词： 火山岩地球化学矿床成因智博铁矿西天山　出处：《地质与勘探》2016年01期 　论文类型：期刊论文

【摘要】：新疆和静县智博铁矿床位于西天山阿吾拉勒铁矿带东段,矿体呈层状、似层状、透镜状,赋存于下石炭统大哈拉军山组火山岩系中。矿床的成矿过程分为岩浆期和热液期两个成矿期,其中热液成矿期分为硅酸盐-氧化物阶段、硫化物阶段和石英-碳酸盐阶段。磁铁矿石和火山岩围岩稀土元素配分模式均为轻稀土相对富集的平缓右倾型,轻、重稀土元素之间分馏程度强,轻稀土元素及重稀土元素内部分馏程度均较弱,Eu负异常或异常不明显,无Ce异常。矿石和火山岩围岩微量元素配分曲线特征总体上基本一致,相对富集Rb、U等元素,亏损Ba、Ta、Nd、Ti等元素。磁铁矿δ18O值(3.7%~3.9%)与岩浆成因磁铁矿的δ18O值一致,δ32S值整体表现为幔源硫或岩浆硫特征。这些稀土、微量元素及同位素地球化学特征说明本区矿石和火山岩围岩具有同源性,成矿物质来源于大陆岛弧环境下的深源岩浆;该岩浆形成于准噶尔洋洋壳向南中天山-伊犁地块之下俯冲的岛弧环境中,岩浆在上侵过程中发生一定程度的地壳混染。结合矿床地质特征,认为智博铁矿的形成与岩浆活动有关,受矿浆贯入影响,后期热液作用对成矿有一定的贡献。
[Abstract]:The Zhibo iron deposit in Hejing County, Xinjiang is located in the eastern section of the Awulale iron ore belt in the West Tianshan Mountains. The orebody is layered, laminar and lenticular. The ore-forming process of the deposit is divided into two stages: magmatic period and hydrothermal stage, in which hydrothermal metallogenic period is divided into silicate-oxide stage. The REE distribution model of magnetite and volcanic rock surrounding rock is a gentle right-dip type with relative enrichment of light rare earth elements, and the fractionation degree between light and heavy rare earth elements is strong. The internal fractionation degree of light rare earth elements and heavy rare earth elements is weaker or less obvious, and there is no ce anomaly. The trace element distribution curves of ore and volcanic rock are basically consistent. The 未 18O value of magnetite is 3. 7 and 3. 9) which is consistent with that of magmatic magnetite. The 未 32s values are characterized by mantle-derived sulfur or magmatic sulfur. These rare earth elements, trace elements and isotopic geochemical characteristics indicate that the ore and the surrounding rock of volcanic rocks in this area have homology. The ore-forming material originates from the deep magma in the continental island arc environment. The magma was formed in the island arc environment in which the oceanic crust of Junggar was subducted under the southern central Tianshan-Yili massif, and the crustal mixing occurred in the process of the magma transgression, which combined with the geological characteristics of the deposit. It is considered that the formation of Zhibo iron ore is related to magmatic activity and influenced by the penetration of magma, and the late hydrothermal process has a certain contribution to the mineralization.
【作者单位】：中国地质大学(北京)地质过程与矿产资源国家重点实验室;中化地质矿山总局地质研究院;山东省地质科学实验研究院山东省金属矿产成矿地质过程与资源利用重点实验室;西南科技大学;中化地质矿山总局新疆地质调查院;上海申丰地质新技术应用研究所有限公司;
【基金】：中国地质调查局天山成矿带地质矿产调查评价项目(编号:1212011120497)资助
【分类号】：P618.31
【正文快照】： Ma Fang-bin,Du Yang-song,Li Da-peng,Tu Wei,Wang Kai-hu,Bai Yu.Geochemical charac-teristics of the Zhibo iron deposit in West Tianshan of China and geological implications[J].Geologyand Exploration,2016,52(1):0001-0013新疆西天山地区阿吾拉勒铁矿带为新疆最

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