The western Zhen'an area enjoys superior ore-forming conditions of tungsten-molybdenum polymetallic deposits. A batch of large and medium-scale tungsten-molybdenum deposits such as Dongyang, Qipangou, Guilingou, Yueheping, and Hetaoping, have been discovered in this area, and they are related to intrusions. To explore tungsten-molybdenum ore bodies, it is necessary to carry out studies on intrusions related to mineralization, especially concealed intrusions. Based on high-precision gravity anomalies, this study extracted the gravity anomaly data of concealed plutons using the minimum curvature potential field separation method. Moreover, it investigated the plane positions of the concealed plutons in the western Zhen'an area by combining the geophysical characteristics of the exposed plutons, identifying five concealed plutons, namely Lanbandeng, Shapingcun, Yuehetai, Dongchuanjie, and Huangjinmei, through investigation. Moreover, this study conducted the 3D gravity anomaly inversion for typical concealed plutons, determining the spatial distribution characteristics of the concealed plutons. The Yuehetai and eastern Lanbandeng concealed plutons have been verified through boreholes, with high-grade wolframite being discovered. The method proposed in this study can provide technical support for the study of concealed plutons in the Zhen'an area and other areas, as well as important data for the study of the tectonic-magmatic-metallogenic evolution of the southern Qinling metallogenic belt.
张瑾爱, 杨渊, 张林. 基于重力异常的镇安西部隐伏岩体空间分布规律研究[J]. 物探与化探, 2023, 47(3): 618-627.
ZHANG Jin-Ai, YANG Yuan, ZHANG Lin. Spatial distribution patterns of concealed plutons in the western Zhen’an area based on gravity anomalies. Geophysical and Geochemical Exploration, 2023, 47(3): 618-627.
Chen H, Hu J M, Wu G L, et al. Late mesozoic intra-continental deformation and lateral extrusion structure in central segment of Southern Qinling Belt[J]. Journal of Jilin University :Earth Science Edition, 2014, 44(6):1906-1927.
Zhang C L, Liu L, Zhang G W, et al. Determination of the neoproterozoic collision granites in the Northern Qinling Mountains and their tectonic significance[J]. Earth Science Frontiers, 2004, 11(3):33-42.
Wang R T, Ji Y F, Cheng H, et al. Metallogenic regularities and future prospecting direction of gold-copper deposits in the Zhashui-Shanyang Orefield,Southern Qinling Orogen[J]. Geoscience, 2021, 35(6):1487-1503.
Peng H L, Yang Y C, Wang H M, et al. Geochemistry and tectonic significance of the Xiaomoling island arc volcanic rocks in the Zhen'an County[J]. Shaanxi Geology, 2004, 22(1):11-16.
Li S Q, Yang X Y, Qu W J, et al. Molybdenite Re-Os age and metallogeny of the Yueheping skarn molybdenum deposit in Ningshan,southern Qinling[J]. Acta Petrologica Sinica, 2010, 26(5):1479-1486.
Zhang W S. Study on the geological characteristics and the relationship between hidden rock mass and mineralization of West Zhen'an Tungsten ore field,Southern Qinling[D]. Xi'an: Chang 'an University, 2020.
Yang X K, Chao H X, Ruan S Q, et al. Report on magmatism and tungsten-molybdenum ore-forming magma in western Zhen'an ore concentration area[R]. Shaanxi Mineral Geology Survey Center, 2019.
Wang J M, Du S X, Cao H Y, et al. Investigation and evaluation of tungsten-molybdenum polymetallic deposit in Jiangkou-Taishanmiao Area,Ningshan County,Shaanxi Province[R]. Shaanxi Mineral Geology Survey Center, 2016.
Ruan S Q, Yang X K, Zhu W, et al. Study on characteristics of ore-forming fluids in Qipangou tungsten mining area,Western of Zhen'an,Shaanxi[J]. Gold Science and Technology, 2019, 27(2):153-162.
Liu L, Bai H, Zhao X F, et al. Mineralization and ore-controlling mechanism of hidden rock mass in Guilin valley,Shaanxi Province[J]. Northwest Geology, 2012, 45(z1):53-56.
Ren T, Wang R T, Wang X Y, et al. Exploration ideas and methods for copper deposits in Zhashui-Shanyang sedimentary basin,Qinling orogenic belt[J]. Acta Geologica Sinica, 2009, 83(11):1730-1738.
Wang X X, Wang T, Qi Q J, et al. Temporal-spatial variations,origin and their tectonic significance of the late mesozoic granites in the Qinling,central China[J]. Acta Petrologica Sinica, 2011, 27(6):1573-1593.
Gao Y F, Yang X K, Ruan S Q, et al. Characteristics of ore-controlling structures and prospecting indicators in the western tungsten deposit area of Zhen'an,south Qinling[J]. Gold Science and Technology, 2019, 27(4):489-496.
Qi G, Lyu Q T, Yan J Y, et al. Geologic constrained 3D gravity and magnetic modeling of Nihe deposit——A case study[J]. Chinese Journal of Geophysics, 2012, 55(12):4194-4206.
[17]
董王仓, 李新林. 陕西省矿产地质[M]. 武汉: 中国地质大学出版社, 2018.
[17]
Dong W C, Li X L. Mineral geology of Shaanxi Province[M]. Wuhan: China University of Geosciences Press, 2018.
[18]
韩彤. 空间域位场分离方法对比研究[D]. 西安: 长安大学, 2019.
[18]
Han T. Comparative study on potential field separation methods in space domain[D]. Xi'an: Chang 'an University, 2019.
Wang M, Wang L F, He H, et al. Separation of gravitational field sources by matching filtering technique[J]. Geophysical and Geochemical Exploration, 2015, 39(S1):126-132.
Ji X L, Wang W Y, Qiu Z Y. The research to the minimum curvature technique for potential field data separation[J]. Chinese Journal of Geophysics, 2015, 58(3):1042-1058.