综合物探方法在淄博金岭王旺庄矿区富铁矿勘查中的应用

    Application of comprehensive geophysical exploration methods in the exploration of rich iron ore in Wangwangzhuang Mining Area, Jinling, Zibo

    • 摘要: 淄博金岭岩体主要为早白垩世沂南序列上水河单元细粒角闪闪长岩,出露于中东部的花山、铁山、东尹家-西尹家一带,为中偏基性-中性-中偏碱性的杂岩体,属于同源同期不同次序形成的侵入岩,岩性比较复杂。金岭岩体为山东省内主要的成矿岩体之一,区内发育多个大型铁矿床。根据资料显示,铁矿作为我国的主要战略矿产,目前仍处于短缺状态,且区内多个矿山企业已经关停,部分矿山企业也面临着资源量枯竭的局面,所以在金岭岩体外围开展找矿勘查及寻求突破仍是下一阶段工作的重点方向。以往物探勘查工作多采用单一方法,约束较少,计算精度较低,对找矿勘查的指导意义不强,造成钻孔揭露地层与物探解译结果差别较大。采用高精度重力剖面测量、高精度磁法剖面测量、可控源音频大地电磁测深(CSAMT)、井中三分量磁测、地质资料联合反演联合解译,增加反演约束条件,可以使计算精度大幅度提高,验证了方法的有效性,同时对指导后期钻孔布设提供更多依据,为金岭岩体深部及外围找矿突破提供更多的方法支持。

       

      Abstract: The Jinling rock mass in Zibo is mainly the fine-grained hornblenite of Shangshuihe unit of the Early Cretaceous Yinan sequence, which is found in Huashan, Tieshan, East Yinijia-West Yinijia area in the middle east region. It is a mesobasic, neutral and mesobasic complex, which belongs to the intrusives formed in different sequences at the same homology period. Jinling pluton is one of the main ore-forming pluton in Shandong Province, and several large iron deposits are developed in the area. According to the data, iron ore, as a major strategic mineral in China, is still in a state of shortage, and many mining enterprises in the area have been shut down, and some mining enterprises are also facing the situation of resource depletion. Therefore, it is still the key direction of the next stage of work to carry out mineral exploration and seek a breakthrough in the periphery of Jinling rock mass. In the past, a single method was used in geophysical exploration, which has fewer constraints and low calculation accuracy, and is not of strong guiding significance to prospecting and exploration, resulting in a great difference between the results of drilling and geophysical interpretation. By using high-precision gravity profile survey, high-precision magnetic profile survey, controlled source audio magnetotelligm-sounding(CSAMT), three-component magnetic survey in borehole and joint inversion and interpretation of geological data, and adding inversion constraints, the calculation accuracy can be greatly improved, the effectiveness of the method is verified, and more basis is provided for guiding the later drilling layout. It provides more methods to support the breakthrough of deep and peripheral prospecting of Jinling rock mass.

       

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