内蒙古标山地区地气测量地球化学特征及找矿预测
袁伟恒 , 杨贵才 , 耿国帅 , 王美娟 , 李娜 , 王怡璟
黄金科学技术 ›› 2025, Vol. 33 ›› Issue (04) : 753 -763.
内蒙古标山地区地气测量地球化学特征及找矿预测
Geochemical Characteristics and Prospecting Prediction of Geogas Survey in the Biaoshan Area, Inner Mongolia
标山地区位于内蒙古北山造山带,月牙山—洗肠井蛇绿岩带以北,红石山—百合山蛇绿岩带以南,区内成矿作用强烈。为进一步圈定找矿靶区,在标山南测区布设了7条地气地球化学剖面,通过分析单元素异常特征和元素组合特征,研究区内地气异常特征。结果表明:标山南测区Cu元素异常范围大,异常值高,为本区成矿前景最好的元素,元素组合异常显示,Bi、Sb、Cu、Pb和Zn元素异常规模大,套合性好,说明主成矿元素为Cu,伴生Bi、Sb、Pb和Zn等成矿元素。结合成矿地质背景,圈定了2处综合异常,通过对综合异常进行分析,优选1处异常开展异常查证工作。根据异常检查,揭露铜矿化体1条,取得较好的找矿效果,认为区内具备中—低温热液型铜多金属矿找矿潜力。研究结果证明,地气测量方法是干旱、半干旱覆盖区寻找隐伏铜多金属矿的有效手段。
The Biaoshan area located within the Beishan Orogenic Belt in Inner Mongolia, is geographically positioned north of the Yueyashan-Xichangjing ophiolite belt and south of the Hongshishan-Baiheshan ophiolite belt. This area is part of the Shibanjing-Heidashan Cu, Au, Fe, Ni metallogenic belt. Recent discoveries, including the Elegenwulanwula Cu-Mo deposit, Xiaohulishan Mo deposit, Dulongbao Mo deposit, and Zhusilenghaierhan Cu deposit, underscore the region’s intense mineralization and promising potential for fur-ther exploration. However, the increasing challenges associated with surface exploration and the interference of cover layers with traditional geochemical methods, necessitate the use of deep-penetrating geochemical techniques to elucidate the causes of anomalies and accurately identify target areas for future mineral exploration. This study examines the elemental migration characteristics and anomaly response mechanisms of geogas survey in the Biaoshan area, establishing seven geogas geochemical profiles in the southern Biaoshan region. Through a detailed analysis of single-element anomalies and element associations, the geogas anomaly characteristics within the region were systematically investigated. The findings reveal that the copper(Cu) element displays an extensive anomaly range and elevated anomaly values, identifying it as the most promising element for mineralization within the area. The geogas element association anomalies further demonstrate that bismuth(Bi), antimony(Sb), copper(Cu), lead(Pb), and zinc(Zn) exhibit significant anomaly scales and strong spatial coincidence. This suggests that copper is the primary mineralizing element, with bismuth, antimony, lead, and zinc serving as associated mineralizing elements. In light of the geological context of mineralization, two comprehensive anomalies were delineated. Subsequent analysis of these anomalies led to the selection of one for further investigation. Anomaly inspection, revealed a copper orebody, characterized by a width of 1~3 m and an extension exceeding 30 m. This orebody is hosted within the third formation of the Beishan group and altered gabbro, and is accompanied by alterations such as malachite, chalcopyrite, goethite, and silicification. The mineralization is controlled by northwest-trending faults and associated secondary structures, with the spatial distribution of the mineralization body closely aligning with the anomaly morphology. Considering the geological conditions conducive to mineralization, it is posited that the region holds potential for the discovery of medium-temperature to low-temperature hydrothermal copper polymetallic deposits. Prospecting indicators for this category of mineral deposits have been identified. The findings of this study indicate that the geogas survey technique is an effective method for detecting concealed copper polymetallic deposits in arid and semi-arid regions with surface cover.
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中国地质调查局项目“内蒙古额济纳旗北山北带金多金属资源调查评价”(DD20243183)
中国地质调查局地球物理调查中心科技创新基金“内蒙古北山北带斑岩型矿床成矿规律研究”(DKC20230002)
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