摘要
独泉沟锰矿是青藏高原发现的首例富锰矿,成矿元素分析结果表明,矿石中Mn平均品位为41.95%,达到了Ⅰ级富锰矿石的品位标准。该锰矿体主要呈层状、似层状产出于上二叠统—下三叠统天泉山组复理石碎屑岩内;矿体地表部分为残坡积,残坡积范围宽20~30m,长约50m。根据产状及结构构造的差异,将研究区锰矿体分为层状锰矿体和脉状锰矿体,二者的矿石矿物皆是硬锰矿,脉石矿物以石英为主。初步研究认为,独泉沟锰矿是海相热水沉积型锰矿。作为青藏高原地区发现的首例富锰矿,独泉沟锰矿的发现填补了区内锰矿找矿工作的空白,对其成因的研究能为今后的找矿工作提供重要的线索和依据,在区域找矿方面具有一定的指示意义。
This paper reports the discovery of the Duquangou manganese deposit. This kind of manganese deposit was found for the first time in the Tibetan Plateau. Its tectonic position is the middle-western segment of the Longmu Co-Shuanghu-Lancang River suture zone. Ore-forming elements analysis shows that the average grade of manganese in the minerals is 41.95%, which achieves the grade standard of Grade I rich manganese ore. The manganese deposit occurs within the Upper Permian-Lower Triassic Tianquanshan Formation in layered and layer-like forms. Orebody surface part is residual manganese deposit whose width is 20~30m and whose length is 50 m. The manganese ores are divided into layered manganese ore and vein manganese ore according to the difference of occurrence,morphology and structure of the manganese. The ore mineral composition is psilomelane,and quartz is the main gangue mineral. It is considered that the manganese ore deposit is a marine hydrothermal sedimentary manganese deposit. As a rich deposit found for the first time in the Tibentan Plateau,the discovery of the Duquangou manganese ore not only fills in the blank of the manganese deposit in Tibet but also provides clues and basis,so it has an indicative significance in regional manganese prospecting.
出处
《地质通报》
CAS
CSCD
北大核心
2017年第6期956-963,共8页
Geological Bulletin of China
基金
中国地质调查局项目<冈底斯-喜马拉雅铜矿资源基地调查>(编号:121201010000150014)
<班公湖-怒江成矿带铜多金属矿资源基地调查>(编号:DD20160026)
青年科学基金项目<藏北聂荣微陆块新元古代-寒武纪构造演化(批准号:41402190)
<青藏高原羌唐南部埃迪卡拉纪地层研究>(批准号:41602230)
关键词
青藏高原
龙木错-双湖-澜沧江板块缝合带
富锰矿
热水沉积型锰矿
Tibetan Plateau
Longmu Co-Shuanghu-Lancang River suture zone
rich manganese deposit
hydrothermal sedimentary manganese deposit
