新疆首次发现三斜锰辉石

The first discovery of pyroxmangite in Xinjiang

在对西昆仑玛尔坎苏锰矿带研究过程中,首次发现三斜锰辉石,与软锰矿、黄铁矿等共生。它主要产于片理化、碎裂化石英砂岩中。该研究区的三斜锰辉石主要呈黑褐色,短柱状,两组解理。本区的三斜锰辉石含Fe较低,Fe/Mn比值为0.03~0.06,w(SiO2)介于38.81%~50.83%之间,w(MnO)介于46.11%~55.06%之间,w(CaO)介于0.73%~4.73%之间。X射线衍射主要粉晶谱线为2.96892、2.18857、4.73916、2.68367、3.47761、3.04409、2.61303、2.21284。三斜锰辉石是国内外文献中较少报导的一种稀少矿物,作为热液矿床中的特殊矿物,是寻找矽卡岩型铅、锌及锰矿床的重要找矿标志。它的发现对进一步在该区域开展找矿,特别是寻找同类型的锰矿床具有重要意义;同时,三斜锰辉石被认为是高压低温变质作用的特征矿物,对于矿床成因探讨具有指向性意义。

During the study on the Markansu manganese ore belt in the West Kunlun Mountains,pyroxmangite is discovered for the first time to coexist with pyrolusite and pyrite.It is mainly produced in foliated and fragmented quartz sandstone.The pyroxmangite in this study area is mainly dark brown in short columnar shape with two groups of cleavage.The pyroxmangite contains low content of Fe,Fe/Mn is 0.03-0.06,SiO2 content is between 38.81%-50.83%,MnO content is between 46.11%-55.06%,CaO content is between 0.73%-4.73%.The main powder crystal spectrum of X-ray diffraction:2.98692,2.18857,4.73916,2.68367,3.47761,3.04409,2.601303 and 2.12884.The pyroxmangite is a rare mineral seldom reported in domestic and foreign literature.As a special mineral in hydrothermal deposit,it is an important prospecting indicator to search for skarn-type Pb,Zn and Mn deposits.There is a great significance for its discovery to carry out further ore prospecting in this area,especially to explore for manganese deposits of the same type.At the same time,the pyroxmangite is considered to be a characteristic mineral of high-pressure and low-temperature metamorphism,and it has a guiding significance for the study of deposit genesis.