Peng-liang Wang, Wei Jian, J. Mao, Huishou Ye, Weiwei Chao, Yongfei Tian, Jianming Yan
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引用次数: 4
摘要
松里沟金矿床位于河南省西部松县,是小秦岭-熊儿山地区众多碲化金矿床之一。金矿体赋存于台华超群内,受西西向F101断裂控制,该断裂被花岗斑岩脉切断。金矿体中常见的矿物包括石英、绿泥石、绿帘石、钾长石、方解石、萤石、绢云母、绢云母、氟碳铈矿、黄铁矿、方铅矿、黄铜矿、闪锌矿、碲化物、金、铋矿、磁铁矿和赤铁矿,黄铁矿是主要的硫化物。确定了黄铁矿—石英阶段(I)、石英—黄铁矿阶段(II)、碲化金阶段(III)和石英—方解石阶段(IV)四个成矿阶段。本文报道了含碲化金的黄铁矿Rb-Sr年龄和花岗斑岩锆石U-Pb年龄,以及黄铁矿和方铅矿的S同位素数据。黄铁矿Rb-Sr等时年龄为126.6±2.3 Ma (MSWD = 1.8),花岗斑岩锆石U-Pb平均年龄为166.8±4.1 Ma (MSWD = 4.9)。黄铁矿的(87Sr/86Sr) i值为0.7104 ~ 0.7105,硫化物的δ34S值为- 11.84 ~ 0.28‰。得到的Rb-Sr等时线年龄代表了松里沟金矿床的成矿年龄,比花岗岩斑岩的锆石U-Pb年龄要年轻得多。锶和S同位素以及氟碳铈矿的存在表明,成矿流体来源于地幔组分输入的长英质岩浆,随后与太华超群相互作用。碲来源于交代地幔,与华北克拉通下商丹洋壳和伊扎那吉板块的俯冲有关。该矿床是北陆盆地东部早白垩世大型金矿化的一部分,形成于伸展构造环境。
Geochronology and fluid source constraints of the Songligou gold‐telluride deposit, western Henan Province, China: Analysis of genetic implications
The Songligou gold‐telluride deposit, located in Songxian County, western Henan Province, China, is one of many gold‐telluride deposits in the Xiaoqinling‐Xiong'ershan district. Gold orebodies occur within the Taihua Supergroup and are controlled by the WNW F101 Fault, and the fault was cut across by a granite porphyry dike. Common minerals in gold orebodies include quartz, chlorite, epidote, K‐feldspar, calcite, fluorite, sericite, phlogopite, bastnasite, pyrite, galena, chalcopyrite, sphalerite, tellurides, gold, bismuthinite, magnetite, and hematite, and pyrite is the dominant sulfide. Four mineralization stages are recognized, including pyrite‐quartz stage (I), quartz‐pyrite stage (II), gold‐telluride stage (III), and quartz‐calcite stage (IV). This work reports the Rb–Sr age of gold‐telluride‐bearing pyrite and zircon U–Pb age of granite porphyry, as well as S isotope data of pyrite and galena. The pyrite Rb–Sr isochron age is 126.6 ± 2.3 Ma (MSWD = 1.8), and the average zircon U–Pb age of granite porphyry is 166.8 ± 4.1 Ma (MSWD = 4.9). (87Sr/86Sr) i values of pyrite and δ34S values of sulfides vary from 0.7104 to 0.7105 and −11.84 to 0.28‰, respectively. The obtained Rb–Sr isochron age represents the ore formation age of the Songligou gold‐telluride deposit, which is much younger than the zircon U–Pb age of the granite porphyry. Strontium and S isotopes, together with the presence of bastnaesite, suggest that the ore‐forming fluid was derived from felsic magmas with input of a mantle component and subsequently interacted with the Taihua Supergroup. Tellurium was derived from metasomatized mantle and was related to the subduction of the Shangdan oceanic crust and Izanagi plate beneath the North China Craton (NCC). This deposit is a part of the Early Cretaceous large‐scale gold mineralization in east NCC and formed in an extensional tectonic setting.
期刊介绍:
Resource Geology is an international journal focusing on economic geology, geochemistry and environmental geology. Its purpose is to contribute to the promotion of earth sciences related to metallic and non-metallic mineral deposits mainly in Asia, Oceania and the Circum-Pacific region, although other parts of the world are also considered.
Launched in 1998 by the Society for Resource Geology, the journal is published quarterly in English, making it more accessible to the international geological community. The journal publishes high quality papers of interest to those engaged in research and exploration of mineral deposits.