Uplift-detachment structure of intracontinental magmatic core complex: A case study of Jiaodong area

Based on the study of gold field structure in Jiaodong area, a new model is put forward which developed as "magma core complex uplift - detachment zone structure" links detachment zone structure and magmatic core complex, and metamorphic core complex structure was not developed in the Mesozoic area.In this study, after more than 10 years of tectonic deformation and alteration lithofacies mapping, magmatic structure mapping, paleomagnetic research and kinematic survey, combined with geophysical data analysis, it is found that the typical "Linglong magmatic core complex uplift and detachment zone structure" in Jiaodong area shows a long-round arch dome.The geological phenomena show: ①The dome core is composed of multi-stage and multi-structural granitic complexes; ②The granitic complex is trapped by faults, and these detachment zones and shovel type fractures with low and middle-angles are shear fractured.The broad fracture zones show superposition of ductile and brittle deformation and post-magmatic hydrothermal metasomatic alteration mineralization; ③The hanging wall rocks of the detachment fault are distributed around the magmatic core, and are composed of basement metamorphic rocks and Mesozoic sedimentary rocks, showing a state of detachment depression.The "magmatic core complex uplift-detachment zone structure" is a new model conforming to the East Asian intracontinental tectono-magmatic activation background.Through the study of magma core complex uplift - detachment zone structure, it is proposed that magmatic uplift and pull-apart basin belong to the same tectonic system, extruding tectonic-magmatic uplift and extensional detachment depressions are the products of stress field transformation process, and disintegrating shovel fault and brittle ductile superposition tectonic-rock belt are the targets of metallogenic prediction.Regional diagenetic and metallogenic laws are taken as the mark of direct observation and exploration, and regional geological and metallogenic laws are studied.Geological survey and metallogenic prediction have extensive popularization value and demonstration significance.