浙江缙云骨洞坑萤石矿床成矿流体特征

发布时间：2018-02-21 18:20

本文关键词： 萤石矿床包裹体微量元素稀土元素浙江　出处：《西南石油大学学报(自然科学版)》2017年03期 　论文类型：期刊论文

【摘要】：浙江缙云骨洞坑大型萤石矿床位于华夏古板块北东端,紧邻钦杭结合带。矿床产出于下白垩统馆头组与燕山晚期花岗岩的接触带中,矿体严格受NW向断裂控制。在系统的地质调查基础上,对其微量和稀土元素及流体包裹体开展研究。结果表明,缙云骨洞坑萤石矿轻稀土相对弱富集,重稀土相对弱亏损,具有较强的Eu负异常以及较弱的Ce负异常,配分曲线表现出典型的"V"字特征。La/Ho-Y/Ho图解表明,不同位置萤石样品表现出重结晶方向演化的趋势。Tb/Ca-Tb/La成因图解表明骨洞坑萤石矿属于热液成因类型矿床。流体包裹体测温结果表明,成矿均一温度主要在150~190。C,盐度主要在0.3%~1.5%NaCleqv,密度平均值为0.86 g/m~3,成矿流体应属于中一低温、低盐度、低密度的NaCl-H_2O体系。结合地质特征认为,缙云骨洞坑萤石矿床属中一低温热液裂隙充填型矿床。
[Abstract]:The large fluorite deposit in Gudongkeng, Jinyun, Zhejiang Province, is located at the eastern end of the Huaxia paleo-plate, adjacent to the Qinghang binding belt. The deposit occurred in the contact zone between the Guantou formation of the Lower Cretaceous and the late Yanshanian granite. The ore body is strictly controlled by NW trending faults. Based on the systematic geological investigation, the trace and rare earth elements and fluid inclusions are studied. The results show that the Jinyun Gudongkeng fluorite deposit is relatively weakly enriched in light rare earths and weak depleted in heavy rare earths. There are strong EU negative anomalies and weak ce negative anomalies. The partition curves show typical "V" characters. The evolution of fluorite samples in different locations shows a tendency of recrystallization. The genetic diagrams of Tb / Ca-Tb / La indicate that the Gudongkeng fluorite deposit belongs to the hydrothermal genetic type, and the temperature measurement of fluid inclusions shows that, The metallogenic homogenization temperature is mainly at 150 ~ 190.C, and the salinity is mainly at 0.3 ~ 1.5 NaCleqv. The average density is 0.86 g / m ~ (3). The ore-forming fluid should belong to a NaCl-H_2O system with moderate to low temperature, low salinity and low density. According to the geological characteristics, the ore-forming fluid belongs to the NaCl-H_2O system of low temperature, low salinity and low density. Jinyun Gudongkeng fluorite deposit belongs to middle-low temperature hydrothermal fissure filling type deposit.
【作者单位】：西南石油大学地球科学与技术学院;
【基金】：国家自然科学基金(41502347) 四川省教育厅科技项目(16ZB008)
【分类号】：P619.215

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