摘要
木哈塔依锰矿的发现,标志着西准噶尔地区锰矿的找矿新发现。该锰矿位于西准噶尔木哈塔依蛇绿混杂岩带北部,矿体赋存于硅质岩中,深部表现为含杂色角砾硅质岩,呈层状分布。据岩矿鉴定、物相分析、背散射及激光拉曼分析,地表锰为氧化锰,未见碳酸锰;深部锰为菱锰矿及少量蔷薇辉石和变体锰三斜辉石,菱锰矿大部分赋存于构造热液细脉中。地表已圈定氧化锰矿体10余条,深部圈定4条碳酸锰矿体,碳酸锰产出部位为锰的原生层位。地表锰矿体沿走向规模较大,东西两侧延伸达2 km,且矿体在东侧出现膨大现象,矿脉显著增多。深部碳酸锰矿体平均品位为17.95%,达到了贫锰矿的一般工业指标,显示该区较好的找锰潜力。矿床类型为赋存于蛇绿混杂岩中的沉积变质热液叠加改造型锰矿床,是西准噶尔地区新发现的锰矿类型。近年来,蛇绿混杂岩中发现锰矿的报道越来越多,增生型造山带中的大洋板片地层是古老大洋锰结核赋存的最佳位置,深海远洋放射虫硅质岩是大洋板片地层的重要组成部分,具有较好的找矿前景。
The discovery of the Muhatayi manganese deposit marks a breakthrough in the exploration of manganese deposits in the western Junggar region.The manganese deposit is located in the northern part of the Muhatayi ophiolite melange belt in West Junggar,and the ore body is hosted in siliceous rocks.In the deep part,it appears as siliceous rocks with variegated breccia,distributed in a layered manner.According to rock and mineral identification,phase analysis,back scattering,and laser Raman analysis,the surface manganese is manganese oxide,and no manganese carbonate is found;Deep manganese consists of Rhodochrosite,a small amount of Rhodonite and variant manganese triclinite,and most of Rhodochrosite occurs in tectonic hydrothermal veinlets.More than 10 manganese oxide ore bodies have been delineated on the surface,and 4 Manganese carbonate ore bodies have been delineated in the deep.The Manganese carbonate may be produced in the primary layer of manganese.The surface manganese ore body has a large scale along the strike direction,extending up to 2 kilometers on both sides,and the ore body has expanded on the east side,resulting in a significant increase in ore veins.The average grade of deep Manganese carbonate ore body is 17.95%,reaching the general industrial index of lean manganese ore,indicating that the area has good manganese prospecting potential.The deposit type is a sedimentary metamorphic hydrothermal superimposed and reformed manganese deposit that occurs in the ophiolitic melange,which is the first discovery of this type of manganese deposit in the western Junggar region.In recent years,there have been more and more reports about the discovery of manganese deposits in ophiolite melange.The oceanic slab strata in the accretionary Orogenic belt are the best places for the occurrence of ancient oceanic Manganese nodule.The deep-sea pelagic Radiolaria siliceous rocks are an important part of the oceanic slab strata,with good prospects for ore prospecting.
作者
全孝勤
张文璟
常昊
仇喜超
李尚启
寇昭娟
雒鹏鹏
彭如盼
QUAN Xiaoqin;ZHANG Wenjing;CHANG Hao;QIU Xichao;LI Shangqi;KOU Zhaojuan;LUO Pengpeng;PENG Rupan(Northwest Geological Exploration Institute of China Metallurgical Geology administration,Xi’an 710119,Shaanxi,China;Key Laboratory of Western China’s Mineral Resources and Geological Engineering of Ministry of Education,Chang’an University,Xi’an 710054,Shaanxi,China)
出处
《西北地质》
CAS
CSCD
北大核心
2024年第4期170-181,共12页
Northwestern Geology
基金
国家重点研发计划(2022YFC2903400)
中国冶金地质总局地质综合研究项目(中冶地[2022]CMGBDZYJ003-1)
中国冶金地质总局西北局科创项目(2020188)联合资助。
关键词
矿床
木哈塔依锰矿
激光拉曼
地质特征
成因分析
沉积变质
蛇绿混杂岩
西准噶尔
leposit
Manganese ore
laser raman
geological characteristics
cause analysis
sedimentary metamorphism
ophiolitic melange
West Junggar
