钦杭成矿带南段粤西大金山地区的区域地球化学特征与成矿规律探讨

发布时间：2018-06-16 17:44

本文选题：大金山地区 + 元素分带　；参考：《地质学报》2017年02期

【摘要】：粤西大金山地区位于大金山旋转构造带中,是粤西S、Ag、Pb、W、Sn、Au重要的成矿远景区,该地区矿产地多,矿化类型多,成矿带分布广。其1∶5万水系沉积物综合异常为一个环长35km、宽2~5km,面积约220km2的环带状异常,主要由W、Sn、Bi、Mo、Pb、Zn、Ag、Au等元素组成,具有元素组合复杂,规模大,强度高的特点;环绕着大金山旋转构造带分布有大金山大型钨锡矿、大降坪特大型硫铁矿、高枨大型银铅锌矿、九曲岭中型锡矿、石门头中型铅锌矿等矿床。本文基于化探综合异常,解析各典型矿床特征认为:1大金山地区以"穹隆"为中心,成矿元素自内向外依次形成有规律的水平分带:W、Sn、Bi→Sn→Sn、Pb、Zn、Ag→Ag、Pb、Zn(Au)→Au;2钨锡矿床和铅锌矿床具有清晰的垂直分带规律;3钨锡铅锌银矿床均形成于燕山晚期。在此基础上,建立了大金山地区成矿模式:震旦纪海底火山喷流(气)活动形成的浅变质岩系,为锡铅锌银矿床的形成提供了物质来源;燕山运动早期,在两个区域性北东向断裂带的左旋扭动下,形成大金山旋转构造带;燕山晚期岩浆活动使大金山旋转构造带扩容,且携带部分成矿物质(如钨等)的深源热液溶解了大绀山组地层中的锡、铅、锌、银、金等元素,在各裂隙系统中成矿。
[Abstract]:The Dajinshan area in western Guangdong is located in the Dazhan rotational structural belt. It is an important metallogenic area in the west of Guangdong Province. It has a large number of mineral areas, many mineralization types and a wide distribution of metallogenic belts. The Synthetical anomaly of 1: 50 000 water system sediment is a ring belt anomaly with a ring length of 35 km, a width of 2 ~ 5 km and an area of about 220km2. It is mainly composed of elements such as WSN, Bi-Mo, PbPb-Zn-Zn-Ag-Au and so on. It has the characteristics of complex assemblage, large scale and high strength. There are large tungsten tin deposits, large pyrite deposits, large silver lead and zinc deposits in Gaocheng, medium tin deposits in Jiuqu Mountains, and medium lead and zinc deposits in Shimentou around the Dazhshan rotational structural belt. Based on geochemical comprehensive anomalies, this paper analyzes the characteristics of various typical deposits and considers that the "dome" is the center of the "Dome" in the W1 Da-Jinshan area. The regular horizontal zonation of ore-forming elements from inside to out in order to form a regular horizontal zonation of the Tungsten tin deposit and the lead-zinc deposit are all formed in the late Yanshanian period, and there is a clear vertical zonation pattern of the Tungsten, Tin, Zinc and Silver deposits in both the au ~ (2 +) W ~ (2 +) W ~ (2 +) and Pb ~ (2) ~ (2 +) Zn ~ (2 +) deposits. On the basis of this, the metallogenic model of Dajinshan area was established: the shallow metamorphic rock series formed by the Sinian submarine volcanic exhalation (gas) activity provided a material source for the formation of the tin, lead, zinc and silver deposits, and the early Yanshanian movement, Under the left rotation of the two regional NNE fault zones, the great Jinshan rotational tectonic belt was formed, and the late Yanshanian magmatic activity expanded the Dazinshan rotational tectonic belt. Moreover, the deep hydrothermal solution carrying some mineralizing materials (such as tungsten, etc.) dissolved tin, lead, zinc, silver, gold and other elements in the formation of Danyanshan formation, and formed minerals in various fracture systems.
【作者单位】：广东省地质调查院;
【基金】：中国地质调查局地质矿产调查评价项目(编号1212011085405、1212011220816)资助成果
【分类号】：P612

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