"Magmatic Core Complex" Upheaval-detachment Structure Analysis And Metallogenic Prognosis Of Linglong Gold Ore-field

Jiaodong is the most important gold resource production area in China.The Linglong gold mine is the longest in the history of Jiaodong mining and has a huge potential in deep resources.It currently produces more than 5000kg gold per year.Previous researchers have conducted extensive research on the Linglong gold ore field,but there is still much dispute about the metallogenic model of the Jiaodong gold deposit.In this paper,we selected the topic“magmatic core complex uplift-detachment in the Linglong orefield—analysis and prediction of the detached ore-forming structure”.the study on the fault mineralization in the excavated ore field is of great significance for the exploration of the deep periphery of the mining area and the metallogenic theory of the Jiaodong gold deposit.This article relies on the“three-dimensional study and deep prediction of the fault eroded ore system in the eastern part of the Linglong Ore Field”and the“research on the comprehensive geological and deep metallogenic prediction of the No.48 and No.50 veins in the Linglong Ore Field”and other projects to carried out the development of exquisite granites,Luanjiahe granites,Guojialing granodiorite deformed structures and mapping of fracture alteration alterations in the ore deposits.studied the uplift characteristics of granites,the tectonic stress evolution of the ore-forming periods and the distribution rules of altered lithofacies,and completed a large number of indoor and outdoor work.Submitted the paper and obtained the following understanding:1.Preliminary establishment of the magmatic uplift-dismemberment belt metallogenic model in the Linglong ore field:The mapping of tectonic mapping of typical areas of three types of granites was carried out,revealing the multi-period nuclear bulge features of magma.Combined with the chronology and geochemistry of ore deposits and granites,and the space-time relationship between the morphology and kinematics of the ore-controlling fault zones,the tectonic evolution process of the extrusion uplifting?demolition and mineralization in the nuclear part of the magmatic core complex in the Linglong ore field was analyzed.2.The three-dimensional distribution law of the fracture-altered lithofacies zone is revealed by the spatial mapping of the altered altered lithofacies zone:The measurement of tectonic facies in the mining area,ore section and orebody level indicates that the width of the fracture alteration zone in the orefield can reach a range of 2.5km;the distribution pattern of altered rock facies in the deep part of the orefield reveals that the Dakaitou is different from the Jiuqu ore section.The ore-controllingfeatureswereconstructed.Combinedwiththemagmatic uplift-dismemberment zone ore-forming and altered lithofacies laws,the ore-forming signs of fracture alterations were summarized,and a multi-level prediction model of deep mineralization and alteration boundary limits was established.3.Research on the depth of diagenesis,metallogenesis and denudation,and prediction of deep metallogenic prospects:According to statistics of quartz deformed grains,the average a/c axis ratios of the porphyry and potassic cataclasite zones are 2.353 and 2.729.The quartz differential density method is used to calculate the ancient differential stress.The mean value of the ac plane stress is 352.4×10~5 Pa and 381.2×10~5 Pa.In short,the diagenetic depth of the exquisite rock mass is 3.85-8.13km,the metallogenic depth is2.4-3km,the denudation depth is 2.6-3.1km,combined with the data of the depth of hydrothermal mineralization up to-9.2km in Kola deep drilling,it is inferred that the Linglong ore field The deep mine still retains about 6km of metallogenic space.