Effect of geological mapping in shallow overburden area of East Junggar, Xinjiang Province: A case of bedrock geological mapping in the Dure shallow overburden area
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摘要:
如何“剥离”盖层,以获取盖层下伏基岩地质(地层、岩浆岩、构造)及矿化信息是开展成矿带浅覆盖区地质填图的重要研究内容。结合区域地质及地球物理场特征,梳理了填图区与基岩地质填图有关问题,在填图区岩石物性分析的基础上,通过对1:5万重力、磁力和激电(IP)测量数据处理分析,采用多参数互约束解释技术和钻探验证约束技术“剥离”盖层,进而获得杜热一带覆盖区下伏基岩地质图,并提出以“穿透性”地球物理探测技术(重磁电)为先导,融合地质、地球化学、浅钻为一体的综合调查技术。在填图区新识别隐伏岩体43处(包括中酸性岩体18处,中基性岩体21处, 基性—超基性岩体4处),划分主要断裂构造22条,进而划分出阿尔曼太-扎河坝蛇绿混杂岩带、北部萨吾尔—二台古生代复合岛弧带和南部谢米斯台-库兰喀孜干古生代复合岛弧带3个三级地质构造分区;划分出奥依达格-吉勒库木铜金钴、铬铁矿找矿远景区1处,圈定找矿靶区4处,其中位于阿尔曼太-扎河坝蛇绿混杂岩带西延带的浅覆盖区玉塔斯铜金钴找矿靶区具有很好的找矿潜力。通过地球物理解译和钻探验证,成功预测并新发现准格尔北缘盆山结合带扎河坝-阿尔曼太蛇绿混杂岩带向西部浅覆盖区延伸。杜热一带浅覆盖区基岩地质填图效果表明,开展成矿带浅覆盖区基岩地质填图可为区域构造环境、成矿地质背景研究和找矿靶区预测提供重要基础地质和矿化蚀变信息。
Abstract:How to "peel off " the cover to obtain the underlying bedrock geology (strata, magmatic rock and structure)and mineralization information is an important research content of geological mapping in shallow overburden area of metallogenic belt.Combined with the characteristics of regional geology and geophysical field, the problems related to the mapping area and bedrock geological mapping were sorted out.Based on the physical property analysis of the mapping area, through the processing and analysis of 1:50000 gravity, magnetic and IP measurement data, the multi-parameter mutual constraint interpretation technique and drilling verification were used to peel off the overburden, and then the underlying bedrock geological map of the Dure overburden area was obtained.Meanwhile, a comprehensive investigation technology guided by "penetrating" geophysical technology (gravity, magnetism, and electricity), integrating geology, geochemistry and shallow drilling was proposed.In this paper, 43 concealed plutons and 22 faults in the mapping area were recognized, including 18 intermediate-acid plutons, 21 medium-basic plutons and 4 basic-ultrabasic plutons.Three 3-order geological tectonic zones were divided, namely Aermantai-Zhahaba ophilitic melange belt, Sawur-Ertai Paleozoic composite island arc belt in the north, and Xiemistai-Kulankazigan Paleozoic composite island arc belt in the south.The Aoyidage-Jilekumu Cu-Au-Co-Fe prospect was determined, in which 4 ore prospects were delineated.Among ore prospects, the Yutasi Cu-Au-Co target area in the west of Aermantai-Zhahaba ophilitic melange belts exhibits agreeable prospecting potential.Through geophysical interpretation and drilling verification, it was successfully predicted and confirmed that the Aermantai-Zhahaba ophilitic melange belt on the basin-mountain junction belt in the northern margin of Jungar extends to the shallow coverage area in the west.The geological mapping of batholith in the Dure shallow coverage area can provide the important basic geological and mineralized alteration information for the regional tectonic environment, metallogenic geological backgrounds and predictions of ore prospects.
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图 1 区域地质简图(据参考文献②修改)
Figure 1.
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