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华南地区钦杭成矿带地质特征和矿床时空分布规律
Received:March 04, 2011  Revised:March 22, 2011  点此下载全文
Cite This Paper:maojingwen,CHEN Maohong, YUAN Shunda, GUO Chunli.2011.Characteristics and Spatial-Temporal Regularity of Mineral Deposits in Qinhang (or Shihang) Metallogenic Belt, South China[J].Acta Geologica Sinica,85(5):636-658
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Author NameAffiliationE-mail
maojingwen Institute of Mineral and Resources jingwenmao@263.net 
CHEN Maohong, YUAN Shunda, GUO Chunli    
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:钦杭成矿带位于华南板内,尽管是扬子与华夏古陆在新元古代拼接部位,但绝大多数矿床形成于中晚侏罗世至白垩纪。本文在梳理前人工作成果的基础上,将钦杭带及旁侧矿床归纳为两个成矿系列和三个成矿亚系列,即:新元古代海底喷流沉积型铜锌矿床成矿系列和燕山期与花岗岩有关的钨锡铜铅锌多金属矿床成矿系列,后者可以进一步分为中晚侏罗世斑岩-矽卡岩-热液脉状铜多金属矿床成矿亚系列,晚侏罗世与花岗岩有关的钨锡多金属矿床成矿系列和白垩纪与次火山活动有关的浅成低温热液型金银铅锌钨锡矿床成矿亚系列。进而讨论了各成矿系列和亚系列的主要矿产类型、基本特点、形成过程、时空分布关系和成矿规律。初步认为其成矿背景为:新元古代的块状硫化物铜锌矿形成于弧后或弧前盆地,由于成矿物质主要来源于地幔,因而更可能为弧前盆地;中晚侏罗世斑岩-矽卡岩-热液脉状铜多金属矿床可能是俯冲板片沿古钦杭结合部位发生局部重熔,形成高钾钙碱性花岗岩,然后上侵定位与成矿的产物;而160-150Ma的大规模钨锡多金属成矿作用及大花岗岩事件可能与板片窗有关,钦杭带中段是板片窗的西部边界,也是壳幔相互作用的中心,因而有大量地幔物质参与成矿;135Ma之后,由于俯冲板片运动发生调整,从斜俯冲变成几乎平行大陆边缘运移,导致大陆边缘大规模岩石圈伸展,相应绝大多数不同来源的矿产资源聚集在火山盆地和断陷盆地。此外,结合前人工作和以往工作的基础,提出了在钦杭成矿带进一步矿勘查的一些思考。
中文关键词:斑岩-矽卡岩-脉状铜铅锌矿床 花岗岩有关钨锡矿床 白垩纪盆地 成矿多样性 钦杭成矿带 华南地区
 
Characteristics and Spatial-Temporal Regularity of Mineral Deposits in Qinhang (or Shihang) Metallogenic Belt, South China
Abstract:The Qinhang belt is located along the Qinhang (Qinzhou Bay to Hangzhou Bay) or Shihang Shiwandashan Mt. to Hangzhou Bay) Neoproterozoic suture in South China, which separates the Yangtze craton and Cathaysian Block. The most ore deposits in the belt are Mesozoic age although they occurred along the Precambrian suture. Based on the previous researches we recognize these deposits in two episodes, i.e. Neoproterozoic marine exhalative Cu-Zn deposits, and Yanshanian granitoids – related W-Sn-Cu-Pb-Zn deposits. The latter can be subdivided in Mid-Late Juarassic porphyry-skarn-vein polymetallic copper deposits, Late Jurassic granite – related W-Sn deposits, and Cretaceous epithermal Au-Ag-Pb-Zn-Sn deposits. After descriptions of the basic characteristics, ore-forming mechanics, spatial-temporal distribution of these deposits it is proposed that the Neoproterozoic marine exhalative Cu-Zn deposits occurred in the foreland basins of the oceanic islands whereas the Mid-Late Juarassic porphyry-skarn-vein polymetallic copper deposits are related the high-K calc-alkaline granites derived locally from the remelt of the subducted Izanagi plate at 180-160 Ma along the ancient Precambrian suture. The large-scale Late Jurassic granite – related W-Sn deposits associated with the crust-source granites with input of the mantle substances at 160-150 Ma, which are inferred to be the result from subducted plate window in the central part in South China and bounded in west by the Qinhang suture, where a lot of large and supper large tin and tungsten deposits developed. After 135Ma the subducted oceanic plate changed its motion direction to be along northeast, paralleling the Eurasian continental margin, which induced the large-scale lithospheric extension. Therefore, the all Cretaceous epithermal Au-Ag-Pb-Zn-Sn deposits developed within the volcanic basins and faulting basins at 120-90 Ma along the Eurasian continental margin.
keywords:porphyry-skarn-veined Cu-Pb-Zn deposits  W-Sn deposits related to granitoids  Cretaceous basins  mineralogenetic variety  Qin-Hang metallogenic belt  South China
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