| 四川马尔康党坝花岗伟晶岩型稀有金属矿床成矿时代的限定: 来自LA-MC-ICP-MS锡石U-Pb定年的证据 |
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| 引用本文： | 张伟, 邹林, 唐文春, 黄健, 段威, 杨贵兵, 范映武, 李小松, 黄建国. 川西热达门伟晶岩型稀有金属矿床锂辉石C-H-O同位素组成及意义[J]. 矿产综合利用, 2023, 44(1): 45-54, 69. DOI: 10.3969/j.issn.1000-6532.2023.01.006 |
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| 作者姓名： | 张伟 邹林 唐文春 黄健 段威 杨贵兵 范映武 李小松 黄建国 |
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| 作者单位： | 1.四川省地质矿产勘查开发局化探队，四川 德阳 618000;2.四川省深地地质勘查有限公司，四川 德阳 618000;3.西南科技大学环境与资源学院，四川 绵阳 621010 |
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| 基金项目： | 四川省地质矿产勘查开发局“四川可尔因花岗伟晶岩田重点锂矿区找矿突破研究（SCDKKJXM-2018002）” |
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| 摘 要： | 热达门稀有金属矿床位于川西可尔因伟晶岩型矿田的南西部，文章在详细的矿床地质特征研究基础上，系统采集同一矿脉同一矿体不同标高（3540～3830 m）的矿石，分析测试了锂辉石单矿物中的C-H-O同位素组成以及不同矿物中的包裹体特征。矿物中包裹体主要以富液相包裹体为主，锂辉石中包裹体盐度集中于8%~20%，均一温度180~330℃，属于中-低盐度、中-高温成矿流体；石英中包裹体盐度集中于0%~8%，均一温度150~240℃，属于低盐度、低温流体。C-H-O同位素测试结果显示热达门稀有金属矿床中的锂辉石δD值为-97.5‰～-104.7‰（平均-102.8‰），相对于可尔因地区其他锂矿床，δD值明显偏小，δ18OH2O值为-0.34‰～2.88‰（平均1.032‰），表明成矿流体可能有大气降水的混入，并受到了围岩黑云母而长花岗岩体的影响。矿床中锂辉石的δ13CV-PDB值为-10‰～-16.6‰，平均-12.7‰，反映主成矿期碳的来源具有岩浆系统和大气降水系统的混合性质，与岩浆-地幔源（花岗岩、地幔多相体系）的低温蚀变有关，并可能混入部分由沉积有机物质经脱羧基作用（decarboxylation）生成CO2。通过对矿物C-H-O同位素及流体包裹体进行研究，进一步明确了成矿流体来源及演化过程。
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| 关 键 词： | 伟晶岩型 稀有金属 锂辉石 C-H-O同位素 热达门 |
| 收稿时间： | 2022-10-18 |
Definition of metallogenic epoch of Dangba granite pegmatite type rare metal deposit in Marcand,Sichuan: evidence from LA-MC-ICP-MS cassiterite U-Pb dating |
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| Zhang Wei, Zou Lin, Tang Wenchun, Huang Jian, Duan Wei, Yang Guibing, Fan Yingwu, Li Xiaosong, Huang Jianguo. The C-H-O Isotopic Composition and Significance of Spodumene for Redamen Pegmatite Type Rare Metal Deposit in Western Sichuan[J]. Multipurpose Utilization of Mineral Resources, 2023, 44(1): 45-54, 69. DOI: 10.3969/j.issn.1000-6532.2023.01.006 |
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| Authors: | Zhang Wei Zou Lin Tang Wenchun Huang Jian Duan Wei Yang Guibing Fan Yingwu Li Xiaosong Huang Jianguo |
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| Affiliation: | 1.Geochemical Exploration Team of Sichuan Bureau of Geology and Mineral Resources , Deyang, Sichuan, China;2.Sichuan Shendi Geology Exploration Co., Ltd., Chengdu, Sichuan, China;3.School of Environment and Resource, Southwest University of Science and Technology, Mianyang, Sichuan, China |
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| Abstract: | The Redamen rare metal deposit is located in the south western part of Keeryin pegmetite typed ore field in western Sichuan. It is a special deposit in the aspects of surrounding rock, element mineralization zoning and distance. The ore with different elevation (3540~3830 m) of the same vein and the same orebody is systematically collected, spodumene single mineral is selected to analyze the C-H-O isotope composition and features of inclusions in different minerals.The inclusions in minerals are mainly liquid-rich inclusions. The salinity of the inclusions in spodumene is 8%~20%, and the homogenization temperature is 180~330℃. The inclusions belong to the ore-forming fluid with medium-low salinity and medium-high temperature. The inclusions in quartz have salinity of 0%~8%, homogenization temperature of 150~240℃, and belong to low salinity and low temperature fluid. The results of C-H-O isotope test show that the δD/‰ of spotamene in the Redamen rare metal deposit ranges from -97.5 to -104.7 (average of -102.8). Compared with the Lijiagou deposit in the southeast of the ore field, the δD/‰ of spodumene is obviously smaller, with the δ18OH2O/‰ ranging from -0.34 to 2.88 (average of 1.032). However, it is basically consistent with the main metallogenic period of spodumene in Lijiagou deposit, indicating that the ore-forming fluid of late mineralization (that is, the main metallogenic period of spodumene) is mixed with meteoric water. The δ13CV-PDB/‰ of spodumene in the Redamen rare metal deposit ranges from -10 to -16.6, with an average of -12.7, indicating that the carbon source in the main mineralization period (spodumene formation period) has a mixed nature of magmatic system and meteoric precipitation system, which is related to the low temperature alteration of magmatic mantle source (granite, mantle multi-phase system) and may be mixed with CO2 generated by the decarboxylation of deposited organic materials. Through the study of mineral C-H-O isotopes and fluid inclusions, the source and evolution process of ore-forming fluids were further clarified. |
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| Keywords: | Pegmatite type Rare metal Spodumene C-H-O isotopee Redamen |
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