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滇中楚雄盆地老街子Pb-Ag矿床和白马苴Au(Cu)矿床赋矿岩体对比及成矿模式
投稿时间:2019-09-28  修订日期:2020-01-14  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020056
摘要点击次数: 73
全文下载次数: 89
作者单位E-mail
杨航 1)昆明理工大学国土资源工程学院 2)有色金属矿产地质调查中心西南地质调查所 983719232@qq.com 
吴鹏 1)昆明理工大学国土资源工程学院 2)有色金属矿产地质调查中心西南地质调查所 76902594@qq.com 
韩润生 1)昆明理工大学国土资源工程学院 2)有色金属矿产地质调查中心西南地质调查所  
姜龙燕 1)昆明理工大学国土资源工程学院 2)有色金属矿产地质调查中心西南地质调查所  
陶琴 1)昆明理工大学国土资源工程学院 2)有色金属矿产地质调查中心西南地质调查所  
江小均 1)昆明理工大学国土资源工程学院 2)有色金属矿产地质调查中心西南地质调查所  
管申进 1)昆明理工大学国土资源工程学院 2)有色金属矿产地质调查中心西南地质调查所  
基金项目:本文受国家重点基础研究发展规划(“973”计划)项目(2015CB452600)、国家自然科学基金项目(41102049)、云岭学者项目(2014)、国家重点研发计划项目(SQ2018YFC06017102)、云南省矿产资源预测评价工程实验室(2010)和云南省地质过程与矿产资源创新团队(2012)联合资助。
中文摘要:滇中老街子Pb-Ag矿床和白马苴Au(Cu)矿床位于金沙江-红河富碱斑岩成矿带中段,是楚雄盆地中与喜山期富碱斑岩体时空关系密切的两个矿化中心,二者相距仅2公里,但是矿种和矿化类型均不同,金属矿物组合差异显著。两个矿化中心同空间、不同矿化类型的深部结构不清,成因联系不明,制约了姚安富碱斑岩区多金属矿床的理论认识与深部勘查。通过岩石组合、赋矿岩体组构及地球化学特征对比,总结矿化元素空间分布规律,研究认为:(1)老街子正长斑岩具斑状结构,斑晶为正长石,岩体内发育脉岩;白马苴正长斑岩具似斑状结构,斑晶为正长石和少量斜长石。岩石组合和组构特征差异反映后者形成深度较前者更深;(2)岩石地球化学特征总体一致,均明显富集大离子亲石元素(K、Rb、Ba和LREE等),相对亏损高场强元素(Ta、Nb、P和Ti等),系中酸性富碱、高钾的正长岩-石英二长岩钾玄质准铝-过铝质系列岩石组合,为同源同期岩浆演化的产物。主要差异为老街子正长斑岩稀土总量及Rb/Sr比值整体较白马苴正长斑岩高,反映其岩浆结晶分异演化程度较白马苴正长斑岩高;(3)对比老街子矿床深部三个中段矿化元素异常分布特征,显示Cu-Mo异常往深部逐渐增强,矿床具有浅部Pb-Ag和深部Cu-Mo-Au的元素组合分带。白马苴矿床由岩体至接触带呈现出Au-Cu矿化/异常→Pb-Ag异常的分带特征。综合上述研究,认为白马苴、老街子矿床及其深部多金属矿化是成因上、时空结构上密切相关的矿床组合,属于浅成低温热液-斑岩型Pb-Ag-Au(Cu-Mo)多金属成矿系统,深部具斑岩型铜、钼、金成矿潜力。在此基础上,构建了Pb-Ag-Au多金属成矿模式。研究工作对矿区深部及外围找矿预测具实践意义,对区域上同类矿床成矿理论研究和矿产勘查具参考价值。
中文关键词:斑岩型多金属成矿系统  富碱斑岩  赋矿岩体  成矿模式  老街子、白马苴矿床  楚雄盆地
 
Contrast of Ore-Bearing Syenite Porphyry and Metallogenic Model from the Laojiezi Pb-Ag Deposit and Baimaju Au (Cu) Deposit in the Chuxiong Basin, Central Yunnan, SW China
Author NameAffiliationE-mail
YANG Hang 1)Faculty of Land Resource Engineering, Kunming University of Science and Technology2)Southwest of Geological Survey, Geological Survey Center for Non-ferrous Mineral Resources 983719232@qq.com 
WU Peng 1)Faculty of Land Resource Engineering, Kunming University of Science and Technology2)Southwest of Geological Survey, Geological Survey Center for Non-ferrous Mineral Resources 76902594@qq.com 
HAN RunSheng 1)Faculty of Land Resource Engineering, Kunming University of Science and Technology2)Southwest of Geological Survey, Geological Survey Center for Non-ferrous Mineral Resources  
JIANG LongYan 1)Faculty of Land Resource Engineering, Kunming University of Science and Technology2)Southwest of Geological Survey, Geological Survey Center for Non-ferrous Mineral Resources  
TAO Qin 1)Faculty of Land Resource Engineering, Kunming University of Science and Technology2)Southwest of Geological Survey, Geological Survey Center for Non-ferrous Mineral Resources  
JIANG XiaoJun 1)Faculty of Land Resource Engineering, Kunming University of Science and Technology2)Southwest of Geological Survey, Geological Survey Center for Non-ferrous Mineral Resources  
GUAN ShenJin 1)Faculty of Land Resource Engineering, Kunming University of Science and Technology2)Southwest of Geological Survey, Geological Survey Center for Non-ferrous Mineral Resources  
Abstract:The Laojiezi Pb-Ag deposit and Baimaju Au (Cu) deposit, located in the middle section of the Jinshajiang-Honghe alkali-rich porphyry metallogenic belt, are typical mineralization centers which associated with Himalayan stage alkali-rich porphyry in Chuxiong basin, central Yunnan province. They are only 2 km apart in space, but they are different both in mineral species and mineralization types, and the metallic mineral assemblages are also significantly different. The deep structure of the two mineralization centers which in the same space and different types of mineralization is unclear, and the origin connection is also unknown, which restricts the theoretical knowledge and deep exploration of the polymetallic deposits in the Yao"an alkali-rich porphyry area. In this paper, fabric and geochemical characteristics of ore-bearing syenite porphyry and the rock association in the two deposits were compared, and the spatial distribution of mineralization elements in the deposits was summarized. The results show that: (1) the Laojiezi syenite porphyry is characterized by porphyritic texture with vein rocks developed and the phenocryst is orthoclase. While, the Baimaju syenite porphyry is characterized by porphyaceous texture and the phenocryst are orthoclase and a small amount of plagioclase. The differences in rock association and fabric features reflect that the formation depth of Baimaju syenite porphyry was deeper than that of Laojiezi syenite porphyry; (2) the geochemical characteristics of the two intrusions are consistent. They are both enrichment in large-ion lithophile elements, such as K, Rb, Ba and light rare earth elements; and depletion in high field strength elements, such as Ta, Nb, P and Ti. Major elements show that both of the syenite porphyry belonged to alkali-rich, high-K and metaluminous - peraiuminous magma series, which are associated with syenite and quartz monzonite. All this characteristics indicate that these two syenite porphyry are the products of homologous and contemporaneous magmatic evolution. However, the ΣREE and the Rb / Sr ratios of the Laojiezi syenite porphyry are higher than that of the Baimayu syenite porphyry, which indicate that the Laojiezi syenite porphyry may have experienced more intensive evolution and differentiation; and (3) the distribution of mineralization elements anomalies at three levels of the Laojiezi Pb-Ag deposit show that the Cu-Mo anomalies gradually increase to the depth.. So this deposit is characterized by metallic elements zonation from Pb-Ag to Cu-Mo-Au with depth. At the same time, from the intrusions to the exterior contact zone, the Baimaju Au (Cu) deposit shows the zoning characteristics of Au-Cu mineralization / anomaly to Pb-Ag anomaly. Based on the above studies, it is believed that the Baimaju Au (Cu) deposit, the Laojiezi Pb-Ag deposit and its deep polymetallic mineralization are closely related genesis and spatial-temporal structures. Therefore, it is suggested that there is an epithermal-porphyry Pb-Ag-Au (Cu-Mo) polymetallic mineralization system in the Laojiezi and Baimaju deposits, indicative of a deeper exploration potential for porphyry-type Cu-Mo-Au deposits. Based on this, a Pb-Ag-Au polymetallic metallogenic model was established. This research is not only significant for prospecting prediction in the deep and periphery of the deposit, but also provides reference for the study of metallogenic theory and mineral exploration in the region.
keywords:Porphyry polymetallic mineralization system  alkali-rich porphyry  ore-bearing syenite porphyry  metallogenic model  Laojiezi and Baimaju deposits  Chuxiong basin
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