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综合物化探方法在江苏赣榆地区钼多金属矿勘查中的应用

Application of comprehensive geophysical and geochemical prospecting methods in exploration of molybdenum−polymetallic ore in Ganyu area, Jiangsu Province

  • 摘要: 苏鲁造山带是江苏固体矿产勘查工作的重点研究区域,矿体埋藏较深,导致研究相对匮乏。阐述了苏鲁造山带南缘的赣榆地区地层、构造及岩浆岩等地质特征,并通过土壤地球化学、激电中梯测量及激电测深等物化探手段,共圈定Mo异常8处,激电中梯异常11处。择优对物化探异常套合较好的激电中梯异常ηs5与化探Mo−2异常开展地表槽探查证及深部钻孔查证,共发现7条钼铜矿体,表明综合物化探方法在赣榆地区具有较好的找矿效果。在物化探工作的基础上,从断裂、蚀变与矿化、物探、化探等方面对赣榆地区找矿前景进行了重点分析。已发现矿体均赋存于北东向、北北东向断裂中,产状与断裂一致。矿化蚀变作用主要发育在岩体及断裂两侧,表明矿床形成与岩浆活动有关,金属矿化主要为黄铜矿化、辉钼矿化、黄铁矿化、磁黄铁矿化等。物化探异常与断裂、矿化蚀变及花岗斑岩套合良好,表明物化探异常、断裂及花岗斑岩等套合部位具有较大找矿潜力。

     

    Abstract: The Sulu Orogenic Belt is the key research area of solid mineral exploration in Jiangsu Province. Due to the deep burial of ore bodies, the study area is relatively scarce. This article elaborated on the geological characteristics of the Ganyu area in the southern margin of the Sulu Orogenic Belt, including stratigraphy, structure, and magmatic rocks. Through geophysical and geochemical methods, including soil geochemistry, induced polarization gradient array surveying, and induced polarization sounding, a total of 8 Mo anomalies and 11 induced polarization gradient array anomalies were delineated, respectively. Based on the favorable anomalies selected, surface trenching verification and deep drilling verification were conducted on the induced polarization gradient array anomaly ηs5 and the geochemical prospecting Mo−2 anomaly, which showed good correlation with the geophysical and geochemical anomalies. As a result, a total of 7 molybdenum−copper ore bodies were discovered, indicating that the comprehensive geophysical and geochemical exploration methods have achieved promising prospecting results in the Ganyu area. Based on the geophysical and geochemical exploration work, this article focused on analyzing the prospecting prospects of the study area from the aspects of fault systems, alteration and mineralization, geophysical exploration, and geochemical exploration. All discovered ore bodies are hosted in NE- and NNE-trending faults, with their occurrence consistent with the fault structures. Mineralization and alteration are predominantly developed within the rock mass and along both sides of the faults, suggesting that the formation of the deposit is related to magmatic activity. The metallic mineralization mainly includes brass mineralization, molybdenite mineralization, pyrite mineralization, and magnetite mineralization. Geophysical and geochemical anomalies exhibit good correlation with faults, alteration and mineralization, and granite porphyry, indicating that areas where geophysical and geochemical anomalies, faults, and granite porphyry coincide hold significant prospecting potential.

     

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