地学前缘 ›› 2022, Vol. 29 ›› Issue (1): 200-230.DOI: 10.13745/j.esf.sf.2021.8.5

• 稀贵稀散金属成矿构造背景及成矿规律 • 上一篇    下一篇

西藏北喜马拉雅成矿带锑金属成矿作用及找矿方向

郑有业1,2(), 王达1, 易建洲3, 余泽章4, 蒋宗洋3, 李晓霞5, 史功文5, 许剑5, 梁遇春5, 豆孝芳1, 任欢1   

  1. 1.地质过程与矿产资源国家重点实验室; 中国地质大学(北京) 地球科学与资源学院, 北京 100083
    2.地质过程与矿产资源国家重点实验室; 中国地质大学(武汉) 资源学院, 湖北 武汉 430074
    3.西藏自治区土地矿权交易和储量评审中心, 西藏 拉萨 850000
    4.西藏鑫湖矿业有限公司, 西藏 拉萨 850000
    5.西藏华钰矿业股份有限公司, 西藏 拉萨850000
  • 收稿日期:2020-08-17 修回日期:2021-06-28 出版日期:2022-01-25 发布日期:2022-02-22
  • 作者简介:郑有业(1962—),男,博士,长江学者特聘教授,主要从事找矿理论、成矿规律及矿产勘查评价工作。E-mail: Zhyouye@163.com
  • 基金资助:
    国家自然科学基金项目(42072109);国家青藏专项(DD20190147-05)

Antimony mineralization and prospecting orientation in the North Himalayan Metallogenic Belt, Tibet

ZHENG Youye1,2(), WANG Da1, YI Jianzhou3, YU Zezhang4, JIANG Zongyang3, LI Xiaoxia5, SHI Gongwen5, XU Jian5, LIANG Yuchun5, DOU Xiaofang1, REN Huan1   

  1. 1. State Key Laboratory of Geological Processes and Mineral Resources; School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
    2. State Key Laboratory of Geological Processes and Mineral Resources; Faculty of Earth Resources, China University of Geosciences (Wuhan), Wuhan 430074, China
    3. Tibet Autonomous Region Land-use and Mining Rights Transaction and Resource Reserves Assessment Center, Lhasa 850000, China
    4. Tibet Xinhu Mining Limited Company, Lhasa 850000, China
    5. Tibet Huayu Mining Limited Company, Lhasa 850000, China
  • Received:2020-08-17 Revised:2021-06-28 Online:2022-01-25 Published:2022-02-22

摘要:

北喜马拉雅成矿带是全球巨型成矿带——特提斯—喜马拉雅成矿域的重要组成部分,发育一系列锑、锑金、锑多金属、金、铅锌银、钨锡(铍)、汞、铯为主的矿床或矿(化)点,是全球地质学家关注的热点区域。北喜马拉雅成矿带锑成矿作用时间集中在24~16 Ma之间,与后碰撞造山成矿事件(N1: 25~9 Ma)时间一致,锑来源于深部岩浆减压分熔形成的富含挥发分的次火山岩浆活动,形成喷流沉积-改造型、岩浆热液型、热泉型矿床系列。因此,矿区内的幔源基性-中性脉岩是锑成矿的重要控制因素,也是找矿的重要标志。Sb元素异常主要围绕羊卓雍错裂谷盆地边缘分布,部分与Au元素异常重合。Sb异常主要与低温热液矿床相关,可单独成矿,亦可与Au共生。当Sb异常与Pb-Zn-Ag异常组合在一起时,多为后期叠加改造成矿,并伴生Ga、Se、In等。锑或锑多金属矿体走向多为近SN向,形成串珠状的地球化学异常组合及矿化组合,主要受走滑正断系统及其次级构造控制,并且在矿带的东部,矿化由北向南具有Sb矿→Au-Sb矿→Au矿→Sb-Pb-Zn-Ag矿→W-Sn矿的规律性分布,揭示成矿中心应在扎西康矿床的深部或南部。锑金矿体走向多为近EW向,主要受拆离构造及其次级构造控制。北喜马拉雅被动大陆边缘中生代裂谷(陷)盆地周围盆山转换部位,特别是同沉积断裂带与新生代SN向堑式构造的交汇部位,是寻找锑、锑金、锑多金属矿床的最有利地区,已发现特提斯—喜马拉雅成矿域中规模第一的扎西康锑多金属矿床等一系列大-超大型矿床,显示巨大的找矿前景。综上所述,北喜马拉雅成矿带将会成为我国最重要的锑资源勘查开发后备基地之一。

关键词: 北喜马拉雅成矿带, 锑成矿作用, 控矿规律, 找矿方向

Abstract:

The North Himalayan Metallogenic Belt (NHMB), a global geological hotspot, is an important component of the Tethys-Himalaya Metallogenic Domain. It consists a series of mineral deposits, mainly Sb, Sb-Au, polymetallic Sb, Au, Pb-Zn(Ag), W-Sn(Be), Hg and Cs ore deposits or occurrences. The Sb ore-forming ages are concentrated between 16-24 Ma, coinciding with the post-collisional orogeny metallogenic event N1 (25-9 Ma). Sb is sourced from subvolcanic magmatism which involves rich volatiles formed from decompression and fusion of hypomagma and is responsible for the development of exhalative sedimentation-reworked, magmatic hydrothermal and hot spring deposits. Thus, the mantle-sourced basic-intermediate dykes within orefield are an important control factor and prospecting indicator for Sb mineralization. Sb anomaly is detected along the edge of the Yangzhuoyongcuo rift basin overlapping partially with Au anomaly. Sb anomaly is mainly associated with epithermal deposits where Sb can mineralize separately or intergrow with Au; when Sb anomaly overlaps with Pb-Zn-Ag anomalies, Sb deposits are usually formed from later stage superposition-reformation and associated with Ga-Se-In mineralization. Sb and polymetallic Sb orebodies are nearly SN-trending in forming toruloid geochemical anomalous and mineralization assemblages. They are controlled by strike slip normal fault system and its secondary structures; moreover, in the eastern part of the ore belt, mineralization occurs from north to south in a pattern of Sb → Au-Sb → Au → Sb-Pb-Zn-Ag → W-Sn, indicating the mineralization center lies in the deep or southern part of the Zhaxikang deposit. By contrast, Au and Au-Sb orebodies are nearly EW-trending and controlled by detachment and its secondary structures. The basin-mountain transition region along Mesozoic rift basin in the North Himalayan passive continental margin, specially the intersection area of syndepositional fault zone and Cenozoic SN-trending graben structures, is the key region for ore prospecting, where a series of large and super-large deposits have been discovered, including the Zhaxikang polymetallic Sb deposit—the largest deposit of its kind within the Tethys-Himalayan Metallogenic Domain. To sum up, the NHMB will become one of the most important reserve bases for antimony resources exploration and development in China.

Key words: the North Himalayan Metallogenic Belt (NHMB), antimony mineralization, ore-controlling regularity, prospecting orientation

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