网络出版日期: 2024-07-03
基金资助
深部金矿探测大数据应用开发山东省工程研究中心开放课题基金项目“胶东西岭金矿床地质—地球化学建模及深部找矿预测”(SDK202217);西北大学大陆动力学国家重点实验室开放课题基金项目“胶东金矿床成矿流体演化及末端效应：以西岭金矿床为例”(22LCD18);中国地质调查局项目“重要矿山深部找矿预测与勘查示范”(DD20230355)
Thermoelectric Characteristics of Pyrite from the Xiling Gold Deposit in Jiaodong Peninsula and Its Implications for Deep Prospecting
Online published: 2024-07-03
西岭金矿床位于三山岛金矿床东侧，是当前胶东金矿集区内新发现的单一矿体规模最大、埋藏最深的金矿床。在地质观察的基础上，开展了不同深度的黄铁矿热电性特征研究。结果表明：西岭金矿床黄铁矿热电系数离散范围和离散度整体较大且相对稳定；浅部黄铁矿热电导型均为N型，而深部均为P型；成矿温度主要集中在250~360 ℃之间，属中—高温热液型金矿床；计算得出黄铁矿热电导型变化梯度值较小，并估算出矿体剥蚀率约为75%。综合黄铁矿各类热电性特征参数，认为西岭金矿床深部仍有较大的找矿前景，矿体最大埋深可达-3 000 m标高。已知金矿体具有向NE侧伏的规律，认为沿着NE侧伏方向至-3 000 m标高处是有效的深部找矿靶区位置。西岭金矿床黄铁矿热电性特征研究可为胶东地区金矿床的深部找矿预测提供科学依据。
俞炳, 丁正江, 陈伟军, 李肖, 刘彩杰, 薛建玲, 曾庆栋, 范宏瑞, 吴金检, 张琪彬 . 胶东西岭金矿床黄铁矿热电性特征及深部找矿意义[J]. 黄金科学技术, 2024 , 32(2) : 207 -219 . DOI: 10.11872/j.issn.1005-2518.2024.02.149
The Xiling gold deposit，located on the east side of the Sanshandao gold deposit，is currently the largest gold deposit and deepest gold deposit newly discovered in the Jiaodong gold concentration area.Based on the geological observations，the thermoelectric characteristics of pyrite with different depths（-699 m，-1 190 m，-1 602 m，-2 274 m，and -2 615 m below sea level） in the Xiling gold deposit were analyzed.The results show that the dispersion range and degree（14.59~46.72） of pyrite thermoelectric coefficient in the Xiling gold deposit are generally wide and relatively steady.The thermoelectric conductive type of pyrite at the shallow elevations，such as the -699 m and -1 190 m below sea level，is N-type，while that of pyrite at the deep elevations（-2 615 m below sea level） is P-type.The ore-forming temperatures are mainly concentrated at 250~360 ℃，which is generally consistent with the homogenization temperatures of quartz fluid inclusions，thus belongs to a medium-high temperature hydrothermal gold deposit.The calculated gradient value（0.00~0.29） of the thermo-electric conductive type of pyrite is small，and the estimated denudation rate of the orebody is 75%.Combined with the various parameters of the thermoelectric characteristics of pyrite，it is considered that there is a great potential for exploration in the deep part of the Xiling gold deposit，and the metallogenic depth can reach to -3 000 m below sea level. According to the known regularity of lateral prostration that gold orebodies plunge NE，it is proposed that the potential deep gold orebodies plunge NE to the -3 000 m below sea level is an effective location for deep exploration targets.Through the study of the thermoelectric properties of pyrite in the Xiling gold deposit，it can provide a scientific basis for the deep exploration and prediction of many gold deposits in the Jiaodong gold concentration area.
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