地学前缘 ›› 2013, Vol. 20 ›› Issue (2): 197-204.

• 论文 • 上一篇    下一篇

乌兹别克斯坦Almalyk斑岩铜矿田成矿时代及其地质意义

薛春纪,段士刚,柴凤梅,木合塔尔·买买提,А.Х.Туресебеков3,屈文俊   

  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. 新疆大学 地质与勘查工程学院, 新疆 乌鲁木齐 830046
    3. 乌兹别克斯坦科学院 地质与地球物理研究所, 塔什干 100041
    4. 中国地质科学院 岩矿测试研究所, 北京 100037
  • 收稿日期:2012-04-06 修回日期:2012-10-16 出版日期:2013-03-15 发布日期:2013-03-15
  • 作者简介:薛春纪(1962—),男,教授,博士生导师,矿床学、矿产普查与勘探专业。E-mail:chunji.xue@cugb.edu.cn
  • 基金资助:

    “十二五”国家科技支撑计划重点项目(2011BAB06B02)；地质过程与矿产资源国家重点实验室开放基金项目(GPRM200832)

Metallogenetic epoch of the Almalyk porphyry copper ore field, Uzbekistan, and its geological significance.

  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. Faculty of Geology and Exploration Engineering, Xinjiang University, Urumqi 830046, China
    3. Institute of Geology and Geophysics, Academy of Sciences of the Republic of Uzbekistan,Tashkent 100041, Uzbekistan
    4. Institute of Rock and Mineral Analysis, Chinese Academy of Geological Sciences, Beijing 100037, China
  • Received:2012-04-06 Revised:2012-10-16 Online:2013-03-15 Published:2013-03-15

PDF (PC)

1096

摘要：

新疆西天山斑岩铜矿找矿勘查备受关注。乌兹别克斯坦Almalyk斑岩铜矿田处在西天山西段,铜矿规模属亚洲第二大,但其成矿时代还没有准确厘定。在区域地质构造中,Almalyk铜矿田位于中天山加里东—华力西褶皱带南部边缘,包括Kalmakyr、Dalneye、Sarcheku和Kyzata等4个铜矿床,铜成矿主要发生在斑岩体内,原生矿石呈网脉状、浸染状,金属矿物主要有黄铁矿、黄铜矿,辉钼矿、赤铁矿、磁铁矿、自然金、斑铜矿等。针对Sarcheku铜钼矿石中辉钼矿利用ReOs法测得(320.4±2.3)Ma的模式年龄和(317.6±2.5)Ma的等时线年龄。结合岩浆建造序列,认为矿田内构造岩浆热液过程开始于早石炭世,发展于晚石炭世,结束于早二叠世,斑岩型铜成矿主要在晚石炭世。西天山包括Almalyk铜矿田在内大型—超大型斑岩型铜成矿作用主要在中泥盆—晚石炭世(D2C2),与古亚洲洋壳向哈萨克斯坦—伊犁板块之下俯冲形成的复杂岛弧岩浆地质过程有关。

关键词: 成矿时代, Almalyk斑岩铜矿田, 地质意义, 乌兹别克斯坦, 西天山

Abstract:

The exploration of porphyry copper deposits in western Tianshan, Xinjiang, had attracted much attentions. The Almalyk copper deposit in western Tianshan, Uzbekistan, is one of the largest porphyry copper deposits in Asia, but has not well been dated. The Almalyk copper ore field is located in the southern part of CaledonianHercynian central Tianshan fold belt, and includes four copper deposits: Kalmakyr, Dalneye, Sarcheku and Kyzata. Copper mineralization occurred within the porphyries. The primary ores are characterized mainly by stockwork and disseminated structures, and  the  major metallic minerals are in assemblage of pyrite, chalcopyrite, molybdenite, hematite, magnetite, nature gold and bornite.  The present paper obtains the  weighted model age of 320.4±2.3 Ma and an isochron age of 317.6±2.5 Ma based on the ReOs isotopic method  by using the molybdenites from the Sarcheku coppermolybdenum ores.  On the basis of  the sequence of magmatic formation in this area, it is suggested that the  tectonomagmatic hydrothermal process in Almalyk ore field started at the early Carboniferous, developed during the late Carboniferous, and finished at the early Permian, and the porphyry copper mineralization mainly occurred during the late Carboniferous. The worldclass large and supper large porphyry copper mineralization including the Almalyk copper deposit in western Tianshan  is  closely related to the complex arc magmatic geological processes resulted from the subduction of paleoAsia ocean crust under KazakhstanYili plate, which happened mainly from the middle Devonian to the late Carboniferous (D2C2).

Key words: metallogenetic epoch, Almalyk porphyry copper deposit, geological significance, Uzbekistan, western Tianshan