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北山南部富锰矿石的发现及成因
投稿时间:2019-04-04  修订日期:2019-07-25  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020015
摘要点击次数: 75
全文下载次数: 56
作者单位E-mail
赵振明 中国地质调查局西安地质调查中心(西安地质矿产研究所) xazzhenming@163.com 
计文化 中国地质调查局西安地质调查中心(西安地质矿产研究所)  
李文明 中国地质调查局西安地质调查中心(西安地质矿产研究所)  
孙吉明 中国地质调查局西安地质调查中心(西安地质矿产研究所)  
张明祖 中国地质调查局西安地质调查中心(西安地质矿产研究所)  
基金项目:本文为中国地质调查局 “天山—北山成矿带那拉提-营毛沱地区地质矿产调查(编号:121201011000150002)” 项目,“新疆若羌白山地区1:5万K46E019015、K46E019016、K46E020014、K46E020015四幅地质矿产综合调查”项目(编号:12120115021501)资助.
中文摘要:摘 要:北山南部地区进行矿产地质调查,以查明矿产类型和分布情况。在长城系石英片岩中发现富锰矿石,其野外产出厚度0.5m,沿走向延伸4.6m,呈扁豆体形状,其上部为含锰灰岩与含锰磁铁石英岩,围岩为石英片岩。锰矿石颜色为黑色,致密块状,半金属光泽,染手。对采集的样品化学定量分析,锰矿石Mn为29.68%、30.59%、27.72%,Mn/Fe比分别为9.2、9.8、8.7,P/Mn比分别为0.00071、0.00078、0.00076。含锰灰岩Mn为4.62%~4.92%,含锰磁铁石英岩Mn为0.52%~1.54%。锰矿石X射线衍射分析、物相分析与电子探针分析结果表明,组成锰矿石的矿物有菱锰矿(Rhodochrosite,MnCO3)、软锰矿(Pyrolusite,MnO2)、水锰矿(Manganite,MnO2?Mn(OH)2)、锰铝榴石(Spessartine,Mn3Al2(SiO4)3)、锰钙辉石(Johannsenite,CaMn(SiO3)2)、蔷薇辉石(Rhodonite,(Mn,Fe,Ca)5Si5O15)、锰橄榄石(Tephroite,Mn2SiO4)等。笔者发现的锰矿石与国外锰矿床的矿石相比较,其特征和主要矿物组合,类似于古元代巴西变质锰矿床、泥盆纪南乌拉尔变质锰矿床和白垩纪日本变质锰矿床。从野外矿石产出的地质特征,结合室内样品测试分析结果,并对这些特殊矿物和锰含量的研究认为,锰矿石可能是在敦煌古老地块边部滨浅海环境沉积形成,锰的来源,除过陆源可能还与远离矿石发现地方,并与岩浆有关的热液流体有关。在后期区域变质作用和接触变质作用中,砂岩变质成为石英片岩,矿石中的菱锰矿、软锰矿和水锰矿部分变质成为含锰硅酸盐。之后可能又发生了表生风化作用形成现今的锰矿石。富锰矿石的发现表明该地区具有形成锰矿床的成矿地质环境。
中文关键词:北山南部  长城系石英片岩  富锰矿石  沉积-变质
 
The Discovery of the Manganese-rich ore bed and its genesis in southern Beishan Mountain, China
Author NameAffiliationE-mail
zhaozhenming Xi’an Center of Geological Survey, China Geological Survey (Xi’an Institute of geology and Mineral Resources) xazzhenming@163.com 
JIWenhua Xi’an Center of Geological Survey, China Geological Survey (Xi’an Institute of geology and Mineral Resources)  
LI Wenming Xi’an Center of Geological Survey, China Geological Survey (Xi’an Institute of geology and Mineral Resources)  
SUN Jiming Xi’an Center of Geological Survey, China Geological Survey (Xi’an Institute of geology and Mineral Resources)  
ZHANG Mingzu Xi’an Center of Geological Survey, China Geological Survey (Xi’an Institute of geology and Mineral Resources)  
Abstract:Abstract: The mineral geological survey was conducted in the Southern Beishan Mountain to ascertain its types and distribution. The Manganese-rich ore bed has bee discovered in quartz schist in Changchengian System stratum. In the field , it is 0.5m thick in the surface, yet 4.6m extending in horizontal direction owning the bean shape. Its upside is Mn-limestone and Mn-magnetite quartz rock, sandwiched between Quartz schist. The manganese ore is black, bulk, semi- metallic luster, also dirty hands. The results of the manganese ore samples by quantitative chemical analysis, are Mn 29.68%、30.59%、27.72%,Mn/Fe 9.2、9.8、8.7,P/Mn 0.00071、0.00078、0.00076, the Mn of Mn-limestone is 4.62~4.92%,Mn-magnetite quartz rock is 0.52~1.54%. Moreover, based on the test of the phase analysis , the X-ray diffraction analysis, the electron probe, and the microscopic identify , the important minerals Rhodochrosite (MnCO3), Pyrolusite(MnO2), Manganite(MnO2?Mn(OH)2),Spessartine (Mn3Al2(SiO4)3) , Johannsenite(CaMn(SiO3)2) , Rhodonite ((Mn,Fe,Ca)5Si5O15), Tephroite((Mn2SiO4)) , and some other minerals, have been determined perfectly well. It is much more instructive to compare our ore with many foreign Manganese ore, the characteristics of the Manganese ore and the assembling of the main minerals, strongly similaritied to the ore at the Paleoproterozoic Serra do Navio manganese deposit in Brazil and the Devonian metamorphosed manganese deposits of the South Urals and the Cretaceous Noda-Tamagawa Mine in Japan. According to the fieldwork, researching these special minerals and Mn content upside, We propose that the Mn-minerals ore had possibly deposited in the shallow-marine and marine environment around the Dunhuang ancient block edge areas. Manganese was come from the continent and the hydrothermal fluid sources relation to the magma beyond the sediment place. Then in period of regional metamorphism and contact metamorphism, sandstone had metamorphosed into quartz schist, the ores of Rhodochrosite and Pyrolusite and Manganite, as the primary high quality manganese ores, had become into Mn-silicate. After prolonged supergene weathering, the manganese ores we can see now, has been formed. The discovery of manganese-rich ores indicates that there is a metallogenic geological environment for the formation of manganese deposits in this area.
keywords:Southern Beishan Mountain  Quartz schist of Changchengian System  Manganese- rich ore bed  deposit-metamorphism
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