云南香格里拉麻花坪钨铍矿床地球化学特征及其成因意义
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摘要
麻花坪矿床位于扬子地块西缘盐源-丽江陆架裂陷褶皱带,三江口-剑川深断裂东侧,是一个大型的钨铍矿床。自该矿床发现以来,有关其地球化学特征未见有报道,本文通过两件矿石样和两件围岩样的稀土、微量元素、铅同位素地球化学特征分析,认为麻花坪钨铍矿床的物质来源具明显的"多源性"特征,以深源为主,围岩亦提供了矿质;矿石的气-液包体测温显示成矿流体温度为350°-151°,结合流体性质的讨论,认为麻花坪矿床属后成深源为主的混源中高温热液型钨铍矿床。
Mahuaping deposit which is located in the western margin of the Yangtze block Yanyuan-Lijiang rift shelf fold belt and the east of Sanjiangkou-Jianchuan deep fault is abundant in beryllium and tungsten. Since the deposit has been discovered, there is no report on the geochemistry. In this paper, based on the study of geochemistry characteristics of two pieces of ore samples and two pieces of wall rock samples in HREE and the isotopes of Lead, the author concludes that the material sources of Mahuaping beryllium and tungsten deposit have obvious characteristic of diversity, however, the dominant sources are very deep. By the way, the wall rocks also provide the material sources. The ore-forming fluid temperature of ore's gas-liquid inclusions is 350 ° to 151 °.Combining with the discussion of the fluid nature, the author concludes that Mahuaping is a mixed source of deep source-based and a medium to high-temperature hydrothermal tungsten and beryllium deposit.
Mahuaping deposit which is located in the western margin of the Yangtze block Yanyuan-Lijiang rift shelf fold belt and the east of Sanjiangkou-Jianchuan deep fault is abundant in beryllium and tungsten. Since the deposit has been discovered, there is no report on the geochemistry. In this paper, based on the study of geochemistry characteristics of two pieces of ore samples and two pieces of wall rock samples in HREE and the isotopes of Lead, the author concludes that the material sources of Mahuaping beryllium and tungsten deposit have obvious characteristic of diversity, however, the dominant sources are very deep. By the way, the wall rocks also provide the material sources. The ore-forming fluid temperature of ore's gas-liquid inclusions is 350 ° to 151 °.Combining with the discussion of the fluid nature, the author concludes that Mahuaping is a mixed source of deep source-based and a medium to high-temperature hydrothermal tungsten and beryllium deposit.
引文
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[3]王安建,曹殿华,管烨,等.西南三江成矿带中南段金属矿床成矿规律与若干问题探讨[J].地质学报,2009,83(10):1365-1375.
[4]袁忠信,白鸽.中国内生稀有稀土矿床的时空分布[J].矿床地质,2001,20(4):347-354.
[5]范韬,杨世瑜.滇西北三江并流带宝玉石资源研究[J].昆明理工大学学报(理工版),2004,29(1):4-7.
[6]孙华山,赵鹏大,张寿庭,等.滇西北喜山期富碱斑岩区域矿产成矿多样性表现[J].地质勘探,2004,40(3):15-19.
[7]潘龙驹,刘肇昌,李凡友,等.“三江”云南段大、中型铜、金、多金属矿床聚矿构造特征及识别标志的研究[M].中国有色金属工业总公司,2000.
[8]刘肇昌,李凡友,钟康惠,等.扬子地台西缘构造演化与成矿[M].电子科技大学出版社,1996.
[9]钟康惠,刘肇昌,施央申,等.盐源-丽江构造带是新生代陆内造山带[J].地质学报,2004,78(1):36-43.
[10]冉明佳,钟康惠,李凡友,等.云南香格里拉麻花坪钨铍矿聚矿构造及成矿时代分析[J].四川有色金属,2011,(2):21-27.
[11]唐仁鲤,罗怀松,李荫清,等.西藏玉龙斑岩铜(钼)矿带地质[M].地质出版社,1993.
[12]Vinogradov A P.Average Contents of Chemical Elements in the Principal Types of Igneous Rocks of the Earth’s Crust.Geochemistry,1962,(7):641.
[13]Cannon R S,Pierce A P,Antweiler J C,et al.The data of lead isotope geology related to problems of ore genesis[J].Economic Geology,1961,56(1):1-38.
[14]朱炳泉.地球科学中同位素体系理论与应用-兼论中国大陆壳幔演化[M].北京科学出版社,1998.