Study of Deep Morphology of Linglong Complex Rock Mass and Its Geological Significance Based on Gravity-Magnetic Joint Inversion and 3D Visualization Technology
The Linglong complex rock mass,a prominent large granite body located in the northwest of Jiaodong,serves as the principal ore-hosting rock within the Jiaodong gold concentration area.Notably,gold deposits associated with granite as the primary wall rock constitute over 90%of the total metal reserves in this region.This complex primarily comprises the Late Jurassic Linglong intrusive rock,along with the Early Cretaceous Guojialing,Weideshan,Laoshan,and Yushan intrusive rocks,among others.The Linglong complex rock mass,a significant intrusive rock formation in eastern China,is crucial for understanding regional geological structures and informing mineral resource development.Utilizing high-precision gravity and magnetic data at a 1∶50 000 scale from the Jiaodong area,collected since the early 21st Century,and constrained by existing geological,drilling,and deep geophysical survey profiles,the 2D geological characteristics of 47 sections in the northwest of Jiaodong were comprehensively interpreted by using the gravity and magnetic inversion method with man-machine interaction.Based on this foundation,a three-dimensional model of the Linglong composite rock mass has been developed utilizing a 3D visualization platform.Comprehensive ana-lysis reveals that the Linglong composite rock mass exhibits an irregular mushroom cloud-like morphology,with a central thickness measuring approximately 15 kilometers.The predominant component of this complex is the Late Jurassic Linglong intrusive rocks,while the core may contain a substantial Cretaceous A-type granite intrusion.Although these formations appear sporadically on the Earth's surface,they are interconnected at depth and exhibit a significant scale of occurrence.Drawing upon findings from prior studies concerning the erosion degree of intrusive rocks,as well as the age and rate of large-scale crustal uplift,it is inferred that the Linglong complex rock mass was situated at a depth of approximately 30 km to 35 km during the Late Jurassic period.This research holds significant reference value for comprehending the post-mineralization alteration and preservation of the Jiaodong gold deposit,as well as for predicting and assessing deep gold resources.
Jiaodong gold mineLinglong complex rock massgravity-magnetic joint inversion3D visua-lizationerosion depth
万方数据
维普
