甘肃省厂坝矿集区十里铺幅和黄渚关幅1∶50000地球化学数据集

1∶50 000 Geochemical Dataset of Shilipu and Huangzhuguan Map-sheets, Changba Ore Concentration Area, Gansu Province

甘肃省厂坝地区位于厂坝-页水河华力西、印支期铅锌金银成矿带,在中国地质调查局发展研究中心"甘肃省厂坝矿集区找矿预测"项目实施过程中,深化处理了已有地质、物探、化探、遥感及矿产分布和找矿标志数据,重点在十里铺幅和黄渚关幅开展1∶50 000构造地球化学测量工作。共采集8 694件样品,为2 911件构造地球化学测量样品做了含量分析,主要采样介质为构造充填物与蚀变岩石,平均采样密度13.02个/km^(2)。应用电感耦合等离子质谱仪(ICP–MS)、原子荧光光谱法(AFS)、垂直电极–发射光谱法(ES)分析了19种元素(Au、Ag、Cu、Pb、Zn、As、Sb、Bi、Hg、W、Sn、Mo、Cd、Cr、Co、Ni、Mn、Ba、B),总体查明了主成矿元素铅锌金及伴生元素的分布规律,确定了元素与地层、构造的关系,提出了3个找矿远景区,最终形成1∶50 000甘肃十里铺幅、黄渚关幅地球化学数据集。数据集包含有2 911件样品、每件样品19种元素的原始分析数据表1个,图集1套(含有1张采样点位图、19张元素地球化学图、5张元素组合异常图、1张综合异常图和1张推断解释图)。区内共新发现单元素地球化学异常344处,综合异常24处。结合地质、矿产、物探、化探、遥感等信息圈出金矿找矿靶区1处、铅锌找矿靶区2处。该数据集为矿产地质调查提供了地球化学信息,对厂坝及周边地区深部找矿预测和基础地质研究都具有重要的参考价值。

Changba area, Gansu Province is located in Changba-Yeshuiheariscan and Indosinian Pb-Zn-Ag-Au metallogenic zone. During the implementation of the project titled Prospecting Prediction of Changba Ore Concentration Area, Gansu Province initiated by the Development and Research Center of China Geological Survey, the existing data on geology,geophysics, geochemistry, remote sensing, mineral distribution, and prospecting indicators of Changba area, were further processed. Most importantly, a 1∶50 000 tectonic-geochemical survey of Shilipu and Huangzhuguan Map-sheets was carried out. A total of 8 694 samples were mainly collected from altered rocks and fillings in structures, with a mean sampling density of 13.02 samples per km2. Among them, 2 911 samples were used for tectonicgeochemical analysis. Nineteen elements(i.e. Au, Ag, Cu, Pb, Zn, As, Sb, Bi, Hg, W, Sn, Mo,Cd, Cr, Co, Ni, Mn, Ba, and B) were analyzed using the inductively coupled plasma-mass spectrometer(ICP–MS), atomic fluorescence spectroscopy(AFS) and perpendicular electrodeemission spectrometry(ES). As a result, the distribution regularity of major metallogenic elements(i.e. Pb, Zn, and Au) and their associated elements were generally ascertained, the relations of these elements with stratum and structures were identified, and three prospecting areas were proposed. Based on this, a 1∶50 000 geochemical dataset of Shilipu and Huangzhuguan Map-sheets, Gansu Province(also referred to as the Dataset) was finally developed. It consists of one data table and an atlas. The former is composed of the primary analysis data of 19 elements for 2 911 samples and the later includes one sampling point bitmap, 19 element geochemical maps, five element-association anomaly maps, one integrated anomaly map, and one interference and interpretation map. A total of 344 single-element geochemical anomalies and 24 integrated anomalies were newly discovered in Changba area.Meanwhile, Combining with the information on geology, minerals, geophysical prospecting,geochemical prospecting and remote sensing, one Au prospecting target and two Pb-Zn prospecting targets were delineated. The Dataset could provide geochemical information for mineral geological surveys and serves as an important reference for deep mineral prospecting prediction and basic geological research of Changba and its surrounding areas.