Study On The Metallogenic Regularity And Tectonic Activity In Middle Section Of Gangdise Metallogenic Belt

Aiming at the middle part of Gangdise Orogenic Belt, conducted by the tectonicmetallogeny theory, and on the basis of comprehensive collection of the study areaand other relevant information, the paper redefines the metallogenic geologicalbackground through field investigation, sampling, testing and analysis, mapping andcomprehensive analysis; the characteristics of large deformation structure type areaare carded as well. Studied on typical deposits, the metallogenic geologicalbackground and metallogenic, the coupling relationship between tectonic deformationand mineralization, and the spatial analysis of mineral resources, the Metallogenicrules are concluded and some new conclusions are drawn as follows:（1）The study area experienced the evolution of8important events since thelate Paleozoic Era: Carboniferous and Permian,the north of Gondwana passivecontinental margin extension rifting and expansion, form the Songduo ocean basin；The Middle Permian-Triassic in three Songduo ocean basin’s southward subductionand arc formation of Luobadui; In late three Triassic the Yarlung Zangbo River Basinand Jiali back-arc basin expansion and Songduo ocean basin closed,Songduo activecontinental margin and Pangduo passive continental margin were collisional orogeny;Early-Middle Jurassic,Xiongcun to the west of the Yarlung Zangbo River Basinsubducted to the north, formed the Xiongcun-Yeba Arc basin system; LateJurassic-Early Cretaceous Xiongcun to the east of Yarlung Zangbo River subducted tothe north,formed the Sangri Arc basin system; Early Late Cretaceous, Yarlung ZangboRiver subducted to the north the whole line,later period,Rikaze to the east of theYarlung Zangbo River Basin closed,started collisional orogeny.Rikaze to the west ofthe Yarlung Zangbo River subducted to the north,formed the Gangdise magmatic arc;Paleocene-Middle of Eocene, Yarlung Zangbo River Basin closed, North Himalayapassive continental margin-Gangdise active continental margin were collisionalorogeny,formed the Yarlung Zangbo River combining zone; The Neogene uplift of theplateau, stretching, ore-bearing porphyry widely invasive and Gangdise metal ore beltformation.（2）Large deformation structure types of the main research area include4classes: combination zone, strike-slip, ductile shear zones and nappestructure.respectively. and a total of7belts:Yongzhu-Jiali nappe structure、Longgeer-Cuomai nappe structure、Lagongla-Donggula-Mila Mount nappe structure、Tama-Dubu-Pagu ductile shear zones、Qiabulin-Jiangdang nappe structure、YarlungZangbo combination zone and Dangxiong-Dazhuka strike-slip. (3) Through the anatomy of typical deposits in the study area, results areconclueded as follows: the main minerals in the study area are copper, lead-zinc ore,molybdenum ore; The main types of ore deposits are magmatic hydrothermal deposit(hydrothermal-altered rock deposit), porphyry type and skarn type deposit.（4）By analyzing the relationship between the tectonic event and mineralization,the paper obtains a result: Late Cretaceous to Neogene period was on the controlfunction of tectonic events on the metallogenic. Especially the collision of thePaleogene Neogene Period,and after the collision between the strong control ofmineral output, the main minerals are copper, zinc, gold.（5）Through the analysis and research on the buffer zone of large deformationof the mineral space, the paper gets a result:①Large deformation controls themineralization in some degree, and the effect is much stronger compared with thethree other structural types;②The types of minerals are different from the structuretypes. In among, combination zone and its nearby output chromium iron ore andcopper;The strike-slip has a close relationship with copper and iron ore; Ductile shearzones have a close relationship with copper and gold; Nappe structure has a closerelationship with copper and lead-zinc mine.（6）The main metallogenic period in the study area is the Himalayan period. Atpresent,241deposits have been found,which take55.02%of the entire study area;Secondary mineralization period was the late Yanshan period,and153deposits havebeen found,which take34.93%of the entire study area. And the space is mainlydistributed in the Nyainqentanglha metallogenic belt （Ⅳ-22）、 NorthGangdesemetallogenic belt（Ⅳ-23）、Renbu-Qusong metallogenic belt（Ⅳ-30）,where90、222and45deposits are found respectively, which take81.51%of the entire studyarea.(7) In the study area, the relationship of tectonic-magmatic-metallogenical aretightly related. The area has the potential of finding the magmatic hydrothermaldeposit(hydrothermal-altered rock), porphyry ore deposit, and skarn type deposit.Each deposit owns geological prospecting signs, geophysical, geochemical andremote sensing abnormal exploration signs.