| 何强,邵拥军,刘建平,张德贤,邓京,王泽立,刘忠法,袁玲玲.湘南香花岭矿田铁砂坪锡多金属矿床U-Pb年代学及成矿规律[J].矿产勘查,2024,15(9):1541-1554 |
| 湘南香花岭矿田铁砂坪锡多金属矿床U-Pb年代学及成矿规律 |
| U-Pb geochronology and metallogenetic regularities of the Tieshaping Sn-polymetallic deposit in the Xianghualing orefiled， south Hunan |
| 投稿时间：2024-05-15 修订日期：2024-07-11 |
| DOI：10.20008/j.kckc.202409001 |
| 中文关键词: 独居石U-Pb定年 锡石U-Pb定年 成矿规律 铁砂坪锡多金属矿床 香花岭矿田 |
| 英文关键词: monazite U-Pb dating cassiterite U-Pb dating metallogenic regularities Tieshaping Sn polymetallic deposit Xianghualing orefield |
| 基金项目:本文受国家重点研发计划项目（2022YFC290510001）、国家自然科学基金资助项目（41872091）、湖南省临武县铁砂坪矿区锡多金属矿深部勘查一、二期（2017—2020）、湖南省临武县铁砂坪矿区锡多金属矿资源储量核实（2020）联合资助。 |
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| 中文摘要: |
| 当前中国以全球26%的锡资源支撑全球45%的锡消费量，锡矿储采比持续降低，锡资源增储迫在眉睫。湘南香花岭地区是南岭乃至全国重要的锡资源基地。为揭示香花岭东部铁砂坪锡多金属矿床的深边部资源潜力，本文在野外地质调查基础上，开展了铁砂坪矿床成岩成矿年代学研究，系统总结了成矿规律。研究表明铁砂坪矿床发育5类矿体：矽卡岩锡矿体、产于碳酸盐岩中脉状锡铅锌矿体、产于碳酸盐岩中脉状钨矿体、产于碎屑岩中脉状锡矿体及产于碎屑岩中石英脉型黑钨矿矿体。年代学测试结果表明北部的隐伏花岗岩独居石U-Pb年龄为148.7 Ma，大冲矿段锡石U-Pb年龄为146.0 Ma，而南部茶山矿段获得的锡石U-Pb年龄为157.4 Ma，推测铁砂坪南北两个矿段锡成矿时代存在11 Ma时间差。矿体受花岗岩环带控矿规律和北东向断裂联合控制。识别了4个北东向等距的矿段：白砂岩—鸿运矿段、大冲—顺兴矿段、反背塘矿段、茶山矿段。本文总结的成矿规律不仅对铁砂坪矿床深边部勘查具有重要指导，还对南岭地区锡多金属矿的勘查也具有借鉴作用。 |
| 英文摘要: |
| At present， China supports 45% of the world's Sn consumption with 26% of the world's Sn resources. The Sn reserve-production ratio of China continues to decrease， and the increase of Sn resources has become an urgent task for mineral exploration. The Xianghualing district of southern Hunan is the most important Sn metallogenic district in Nanling and an important base for increasing Sn reserves. In order to reveal Sn potential resource of the Tieshaping Sn polymetallic deposit in the eastern part of the Xianghualing orefield， systematic field geological investigation， geochronology of diagenesis and mineralization and the metallogenic regularities of the deposit were studied. This study shows that five mineralization types are occurred in the Tieshaping deposit： skarn-type Sn orebody in the contact zone， Sn-Pb-Zn orebody hosted in fault zone in carbonate， Sn orebody in clastic rock， scheelite orebody hosted in fault zone in contact zone and quartz-wolframite vein orebody. The monazite U-Pb age of the concealed granite and cassiterite U-Pb age of the Dachong ore block in north area are 148.7 Ma and 146.0 Ma， respectively. The cassiterite U-Pb age obtained in the Chashan ore block is 157.4 Ma. Thus， there is a time gap of 11 Ma for Sn mineraliztion between the north and south metallogenic areas of the Tieshaping deposit. The orebodies are not only controlled by the outer contact zone of granitic intrusion and the north-east-trending faults. Four north-east-trending equidistant ore blocks are identified： Baishayan-Hongyun ore block， Dachong-Shunxin ore block， Fangbeitang ore block and Chashan ore block. The metallogenic regularities of the Tieshaping Sn-polymetallic deposit summarized in this paper are of great significance to guiding deep exploration in the deposit but also to Sn exploration in Nanling region. |
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