| 西藏聂尔错镁硼矿地质特征及成矿机制 |
| |
| 引用本文： | 刘喜方,郑绵平.西藏聂尔错镁硼矿地质特征及成矿机制[J].地质学报,2010,84(11):1601-1612. |
| |
| 作者姓名： | 刘喜方 郑绵平 |
| |
| 作者单位： | 中国地质科学院矿产资源研究所,中国地质科学院盐湖与热水资源研究发展中心,国土资源部盐湖资源与环境重点开放实验室,北京,100037 |
| |
| 基金项目： | 国土资源部“百人计划”项目和中国地质调查局地调项目（编号 200010300104、1212010818056） |
| |
| 摘 要： | 聂尔错镁硼矿为新近发现的一处镁硼矿床。本文通过对其区域地质资料、矿床地质特征研究,并与国内外矿床进行对比,分析了成矿物质来源和成矿机制,总结了成矿模式。聂尔错镁硼矿床赋存于中上全新统,有三个含矿层,中、上含矿层为主要可采矿层,下含矿层为次要含矿层;矿石类型包括粒状集合体库水硼镁石矿、含芒硝库水硼镁石矿、蜂窝状/块状柱硼镁石和混和类型矿石等4种,前两种为主要开采矿石,后两种为次要开采矿石。矿床对比研究表明,聂尔错镁硼矿床与其北部相邻的扎仓茶卡镁硼矿在有工业价值的硼矿物组合和形成矿床的地质环境等方面相同,属同类型矿床,但不同于国内外其它硼矿床。该矿床的成矿物质来源主要为新近纪火山岩。印度板块与亚洲版块碰撞,在靠近班公湖-怒江缝合带的聂尔错盐湖南部形成大面积富含B、Li、Mg、Na等成矿物质的新近纪火山岩,地热水及大气降水将大量成矿物质带入湖中,在干冷气候条件下,湖水浓缩成富含钠盐的饱和成矿溶液,并沉淀了库水硼镁石、柱硼镁石等,形成聂尔错镁硼矿床。
|
| 关 键 词： | 西藏聂尔错 镁硼矿 地质特征 成矿机制 |
| 收稿时间： | 2010/8/15 0:00:00 |
| 修稿时间： | 9/1/2010 12:00:00 AM |
Geological Features and Metallogenic Mechanism of the Nieèr Co Magnesium Borate Deposit, Tibet |
| |
| LIU Xifang and ZHENG Mianping.Geological Features and Metallogenic Mechanism of the Nieèr Co Magnesium Borate Deposit, Tibet[J].Acta Geologica Sinica,2010,84(11):1601-1612. |
| |
| Authors: | LIU Xifang and ZHENG Mianping |
| |
| Institution: | Institute of Mineral Resources, CAGS, R & D Center for Saline Lake and Epithermal Deposit, CAGS, Key Laboratory of Saline Lake Resources and Environment, Ministry of Land and Resources, Beijing, 100037 |
| |
| Abstract: | The Nieèr Co Mg borate deposit is a Mg borate deposit discovered recently. The authors studied regional geological data and geological features of the deposit, compared this deposit with other borate deposits in China and abroad, analyzed the source of ore forming materials and metallogenic mechanism, and summarized the metallogenic pattern. The Nieèr Co Mg borate deposit formed in the upper middle Holocene; its host rocks are mainly divided into three horizons: the upper and middle ore bearing horizons are dominant minable horizons and the lower ore bearing horizon is a subordinate ore bearing horizon. The ore types include kurnakovite granular aggregates, mirabilite bearing kurnakovite, beehive/massive pinnoite and mixed ore type. The former two types are main minable ores, while the latter two types are subordinate. Comparative study of the mineral deposits indicate that the Nieèr Co Mg borate deposit and the Chagcam Caka Mg borate deposit, which is located nearby to the north of Nieèr Co, have the same borate assemblage and metallogenic geological environment, belong to the same type of mineral deposit but and differ from other borate deposits in the world. The ore forming materials of the deposit were mainly derived from Neogene volcanic rocks and geothermal water. The collision of the Indian plate and Asian plate resulted in the formation of extensive Neogene volcanic rocks rich in ore forming materials such as B, Li, Mg and Na in the south of Nieèr Co near the Bangong Co Nujiang suture zone, and large quantities of ore forming materials were carried into the lake by geothermal water and meteoric water. Lake water was concentrated into saturated ore forming solutions rich in sodium salt under the arid climatic conditions, in which kurnakovite, pinnoite and other minerals were precipitated, thus forming a Mg borate deposit in Nieèr Co |
| |
| Keywords: | |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《地质学报》浏览原始摘要信息 |
| 点击此处可从《地质学报》下载免费的PDF全文 |
|
