The preliminary understanding of deep structure exploration n the orefield of Xiaoqinling area
Xiang-Guang ZHENG1(), Lin LU1, Hui-Yi LIU1, Xiao-Long LIU2, Kun XU1, Zhi-Lin ZHANG1
1. No. 2 Comprehensive Geophysical Survey Party Co.,Ltd.,Shaanxi Bureau of Geology and Mineral Resources,Xi’an 710016,China 2. No. 6 Geological Party Co.,Ltd.,Shaanxi Bureau of Geology and Mineral Resources,Lintong 710311,China
According to the measured gravity data and wide-area magnetotelluric sounding study as well as the seismic section and borehole data, the authors investigated the deep structure of Xiaoqingling area. It is considered that the buried depths at 1 500 m, 2 500 m and 3 500 m of Taihua Group in Xiaoqingling area are important tectonic interfaces, especially at 1 500 m, which may limit the emplacement of most quartz vein orebodies. The intersection of the S-dipping and N-dipping resistivity of the grid magnetotelluric profile at 1 500~2 500 m may indicate the formation of large-scale gold orebodies. The fault structure of Xunmadao is complex, and its upper plate may be dominated by structural schist and rifting rocks. The Yanshanian intrusive rock mass may exist at the depth of 3 500 m, which has the prospect of finding quarz vein-type gold deposits and the conditions for forming tectonic alteration rock-type gold deposits. The Taiyao fault dips northward in the stepladder form. Within the range of 1.5~3 km to the north, the underlying Quaternary Taihua Group is buried at the depth of 800~1 500 m. The fault is wide in the west and narrow in the east. The deep prospecting in this area should pay attention to the recognition of the complex structural features of the electrical structure on both sides of the middle and western sections of the Xunmadao fault.
郑向光, 卢琳, 刘会毅, 刘晓龙, 徐坤, 张治林. 小秦岭地区矿田构造深部探测初步认识[J]. 物探与化探, 2020, 44(4): 894-904.
Xiang-Guang ZHENG, Lin LU, Hui-Yi LIU, Xiao-Long LIU, Kun XU, Zhi-Lin ZHANG. The preliminary understanding of deep structure exploration n the orefield of Xiaoqinling area. Geophysical and Geochemical Exploration, 2020, 44(4): 894-904.
Zhu G F. Structural and mineralization characteristics of near east-west trending veins in Xiaoqinling gold field, Shaanxi Province[D]. Beijing:China University of Geosciences (Beijing), 2018.
[3]
杨宗让. 秦岭造山带大型矿集区成矿系统研究[D]. 西安:长安大学, 2012.
[3]
Yang Z R. Studies on the mineralization system of large ore-cluster areas in Qinling orogenic belt[D]. Xi’an:Chang’an University, 2012.
[4]
陕西小秦岭金矿床矿田构造研究与靶区优选报告[R]. 西安地质矿产勘查开发院有限公司, 2016.
[4]
Orefield structure research and target optimization of the Xiaoqinling gold deposit, Shaanxi [R]. Xi'an Institute of Geological and Mineral Exploration Co., Ltd., 2016.
[5]
杨海, 王飞, 汪佩佩, 等. 定量构造测量[M]. 北京: 地质出版社, 2017.
[5]
Yang H, Wang F, Wang P P. et al. Quantitative structural survey[M]. Beijing: Geological Publishing House, 2017.
Wang J D, Wang D Z, Zhan X F, et al. Structural controls on mineralization and distribution of orebodies in the southern ore belt of the Xiaoqinling district[J]. Geotectonica et Metallogenia, 2018,42(6):1064-1077.
Zhang H H, Chen H, Bai H, et al. Geological model for prospectiong prediction in “Trinity” prospecting area in the Xiaoqinling gold deposit in Shannxi and its prospecting significance[J]. Jounal of Geomechanics, 2018,24(3):350-370.
Li C S, Zhang H H, Bai H, et al. Shaanxi shi-ying tian Xiaoqinling gold vein type gold deposit quzrtz thermoluminescence characteristics and prospecting significance[J]. Mineral Explortion, 2019,10(4):801-809.
Li H, Zhang G Y, Gao Y L, et al. The strctural supermposed halo model for prognosis of No.2 enrichment zone at the depth of the Xiaoqinling gold ore concentration area[J]. Geophysical et Geochemical Exporation, 2008,32(5):525-528.
Yang H, Wang F, Wang, P P. Primary halo and deep metallogenic potential of the Q315 gold deposit in Xiaoqinling[J]. Nothwestern Geology, 2019,52(1):199-209.
Hu Z G, Guo F Q. Discussion on the characteristics of gold mineralization in the Taihua group of the Xiaoqinling mountains: A case study in the Qionglai area[J]. Gold Science Technology, 1990,2:1-9.
Wen Y G, Wang H P, Huang Y Y. Geology and deep ore prospecting for gold-bearing veins Q9325,Q141 and Q127 in Xiaoqinling,Shaanxi Province[J]. Geology of Shaanxi, 2019,37(1):16-22.
Ni Y P, Jin L, Yang C S, et al. Geological characteristics and prospecting model in the northern slope of the northern metallogenic belt in Xiaoqinling mountains[J]. Geology and Exploration, 2019,55(5):1143-1152.
Xiong S Q, Fan Z G, Huang X Z, et al. The aeromagnetic atlas of the national exploration prospecting breakthrough strategic action[M]. Beijing: Geological Publishing Press, 2013.
Yang Y, Zhang L, Shi C Y, et al. Application of integrated geophysical exploration method in delineation of intermediate acidic rock mass in the Xiaoqinling area and its spatial resolution[J]. Computing Techniques for Geophysical and Geochemical Exploration, 2019,41(3):386-393.
Wang L Q, Xiao W J. Analysis on the basic characteristics of the Xiaoqinling metamorphic core complex and its ore-controlling model[J]. Northwest Geoscience, 2000,21(1):77-85.
Hu Z G, Qian Z Z. Detachment-metamorphic complex core structure configuration in western segment of Xiaoqingling[J]. Contributions to Geology and Mineral Resources Research, 1994,9(2):58-66.
Gu D H, Zhou J. Several problems worthy of reference for geological exploration work in Xiaoqinling gold deposit, Shaanxi[J]. World Nonferrous Metals, 2019,14:238-240.
Key and basic geological research report of Shaanxi Xiaoqinling gold ore field, [R]. Shaanxi Geological and Mineral Sixth Geological Team Co., Ltd., 2016.
Liu X L, Zhang X B, Zhang H H, et al. Geological characteristics of No.Q195 vein and the analysis of resource potential in the deep part, Shancheyu gold deposit area, Shaanxi[J]. Mineral Exploration, 2018,9(3):388-397.
Tian Q S, Wang M X, Zheng Y, et al. Geophysical characteristics of loess-covered area in the eastern segment of Taiyao fault, Xiaoqingling mountains[J]. Nothwestern Geology, 2019,52(3):253-264.