文章摘要
刘宇恒,刘小虎,胡利娟,孟健寅,肖昌浩.云南保山西邑铅锌矿床含矿断层泥中绢云母 40Ar-39Ar同位素年龄及其地质意义[J].矿产勘查,2026,17(8):1358-1373
云南保山西邑铅锌矿床含矿断层泥中绢云母 40Ar-39Ar同位素年龄及其地质意义
Sericite 40Ar-39Ar dating from the ore-bearing fault gouge in the Xiyi Pb-Zn deposit, within the Baoshan Block, southwestern China and its geological significance
投稿时间：2026-05-30  
DOI：10.20008/j.kckc.202608006
中文关键词: 40Ar-39Ar年代学  断层泥  早石炭世  西邑铅锌矿床  保山地块  特提斯洋
英文关键词: 40Ar-39Ar ages  fault gouge  Early Carboniferous  Xiyi Pb-Zn deposit  Baoshan Block  Tethys
基金项目:本文受中国地质调查局地质调查项目(DD20240127)资助。
作者单位
刘宇恒 中国地质科学院地质力学研究所,动力成岩成矿实验室,北京 100081
河北地质大学地球科学学院,河北石家庄 052161 
刘小虎 中国地质科学院地质力学研究所,动力成岩成矿实验室,北京 100081
甘肃省地质矿产勘查开发局第二地质矿产勘查院,甘肃兰州 730020 
胡利娟 中国地质科学院地质力学研究所,动力成岩成矿实验室,北京 100081
自然资源部古地磁与古构造重建重点实验室,北京 100081 
孟健寅 北京科技大学资源与安全工程学院,北京 100083 
肖昌浩 中国地质科学院地质力学研究所,动力成岩成矿实验室,北京 100081
自然资源部古地磁与古构造重建重点实验室,北京 100081
深地探测与矿产勘查全国重点实验室,北京 100094 
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中文摘要:
      云南保山地块发育大型沉积岩容矿型铅锌矿床，但矿床成因争议较大。本文以保山西邑铅锌矿床为研究对象，开展含矿断层泥中绢云母 40Ar-39Ar年代学研究。结果表明该矿床形成于(329.6±2.6)Ma(2σ， MSWD=1.8)。结合矿床地质特征、断裂性质、矿石结构构造和硫化物的 S-Pb同位素组成综合推断西邑铅锌矿床为早石炭世晚期碳酸盐岩容矿型铅锌矿床，其形成可能与冈瓦纳北缘基梅里地块被动大陆裂解有关。区内铅锌成矿年代学数据显示保山地块经历了 6期铅锌成矿作用，上述成矿事件与特提斯洋的演化关系密切。其中，寒武纪(520～496 Ma)Pb-Zn成矿作用与原特提斯洋壳沿着冈瓦纳北缘向南俯冲有关；早石炭世 Pb-Zn成矿作用与古特提斯洋壳向北俯冲有关的裂解时间相吻合；早侏罗世(约 183 Ma)和早白垩世(142～130 Ma和 127～115 Ma)的 Pb-Zn成矿作用分别与中特提斯洋的俯冲及随后的碰撞事件相关；晚白垩世—早古新世的 Pb-Zn成矿作用与新特提斯洋向北俯冲过程中板片回撤引起的减压熔融有关。研究成果可为区域铅锌矿成矿规律研究和找矿勘查提供年代学约束。
英文摘要:
      Precision dating of Pb-Zn deposits is challenging for evaluating the geodynamic significance in ge.netic models and exploration in Baoshan Block, which is the most rapid growth of Pb-Zn reserves in the Sanjiang re.gion of southwestern China. We have conducted 40Ar-39Ar dating of sericites from the ore-bearing fault gouge fromthe Pb-Zn Xiyi deposit. The results suggest the Xiyi deposit formed at (329.6±2.6) Ma (2σ, MSWD=1.8). The newdate in combination with previously works about geological features, structures, textures of ores, and S-Pb isotopiccomposition of the sulfides, suggest the Xiyi Pb-Zn deposit is a late Early-Carboniferous epigenetic carbonate-hosted deposit and formed by passive continental rifting within the Cimmerian terranes on the northern Gondwanamargin. A combination of our geochronological data with previous studies revealed that six episodes of Pb-Zn miner.alization occurred in the Baoshan Block during the evolution of multiple Tethys oceans. The Cambrian (520-496Ma) mineralization is associated with Proto-Tethyan oceanic slab southward subduction along the northern marginof the Gondwana continent. The Early Carboniferous (~330 Ma) mineralization occurred in rifting setting causing bythe northward subduction of Paleo-Tethys oceanic slab. The Early Jurassic (~183 Ma) and Early Cretaceous (142-130 Ma and 127-115 Ma) mineralizations are related to the Meso-Tethys Ocean subduction and followed collision.The Late Cretaceous-Early Paleocene (61±10 Ma) mineralization caused by the decompression melting due to thetrench retreat in the process of northward subduction of the Neo-Tethys. The above findings provide geochronologi.cal constrains for regional Pb-Zn metallogenic regularity and mineral exploration.
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