投稿时间：2020-08-25
修订日期：2021-08-30
网络发布日期：2021-10-22
中文摘要:查查香卡铀多金属矿床是青海省探明的第一个中型硬岩型U-Th-Nb-LREE矿床。为进一步明确矿床成因，文章在详细描述矿床地质特征的基础上，使用LA-ICP-MS对钠长岩脉中锆石进行U-Pb定年，同时对钠长岩脉和不同矿化强度斜长角闪片岩的岩石学、矿物学和地球化学研究。测试和研究结果表明，该矿床是与钠长岩脉有关的岩浆型铀多金属矿床，其成岩成矿年龄为（401.7±6.3） Ma，矿石的微量和稀土元素特征与钠长岩脉更为相似。文章认为钠长岩脉是在柴达木盆地北缘早古生代造山作用结束后的板内环境中，由深部富集地幔低程度部分熔融形成。矿区西部具有钠长岩脉型铀多金属矿的找矿潜力，而东部则有可能发现岩体型矿体，具有更大的找矿潜力。
Abstract:Chacha Xiangka U-polymetallic deposit is the first medium-scale hard rock type U-Th-Nb-LREE deposit in Qinghai Province. In order to further clarify the genesis of the deposit, based on the detailed description of the geological characteristics of the deposit, this paper uses LA-ICP-MS to test U-Pb age of zircons in albitite dikes, and study the petrology, mineralogy and geochemistry of albitite dikes and plagioclase amphibolite schist of different mineralization intensities at the same time. The results show that the deposit is a magmatic type uranium polymetallic deposit related to the albitite dike with a metallogenic age of (401.7±6.3) Ma. The trace element characteristics of the ore are more similar to the albite veins. The albitite dike was formed from the low level partial melting from the deep enriched mantle under the intraplate environment after the Early Paleozoic orogeny in the northern margin of Qaidam Basin.The western part of the deposit has the ore prospecting potential of albitite vein type uranium ore, while the eastern part might find rock type Uranium ore, which has a greater ore prospecting potential.
keywords:geochemistry albitite zircon U-Pb age deposit genesis uranium polymetallic deposit Chachaxiangka
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基金项目:本文得到东华理工大学核资源与环境国家重点实验室资助基金（编号：Z1914）、江西省教育厅科学技术研究项目（编号：GJJ190390）、中央财政铀矿勘查专项基金项目（编号：201450）、青海省地勘基金项目（编号：2017-56）和青海省科技厅项目（编号：2018-SF-109）联合资助
引用文本：
陈擎,赵如意,康利刚,叶雷刚,刘林,王继斌,鲁宝龙.2021.青海查查香卡铀多金属矿床钠长岩脉地质特征及其对矿床成因的约束[J].矿床地质,40(5):1029~1044CHEN Qing,ZHAO RuYi,KANG LiGang,YE LeiGang,LIU Lin,WANG JiBin,LU BaoLong.2021.Geological characteristics of albitite dikes and its constraint on genesis of Chachaxiangka U-polymetallic deposit in Qinghai Province[J].Mineral Deposits40(5):1029~1044
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