| The thesis has summarized and elucidated metallogenic regularities and prospecting orientation of copper polymetal mineral resources in the northern Wuyi region through comprehensive analysis and research, the systematic field geological survey, identification of rock thin sections and polished sections, indoor geochemical test, isotopic dating (zircon SHRIMP U- Pb method).The thesis has summed up the ore-forming geological background (regional strata, regional structure, regional magmatism ), geophysicl and geochemical features, remote sensing image and distributoin of mineral resources of the northern Wuyi region, on the basis of analyzing the geology characteristics and genesis of the typical Cu polymetallic deposits in Yongping, Lengshuikeng, Shengmikeng and Lizikeng, etc. Some new understanding and achievement are acquired.Papers put forward that there exists a porphyry and skarn metallogenic system under control of the imbricate thrust sheet in Yongping area, with the metallogenic features of“copper early molybdenum later”. Among them Yanshanian tectono-magmatic hydrothermal superimposed transformation function as the main mineralization, and the metallogenic models are skarn type copper sulphur (w) and porphyry molybdenum mine. Isotope-dating shows that SHRIMP U-Pb age of Zircons from migmatite in Yongping Copper Mine is age of 430.5±6.9 Ma, which is the formation of the Caledonian. The research indicates the "Shizhitou rock" as a duplex granitic pluton, where exists granodiorite porphyry . The sulfur isotopeδ34S in the area are beteen -0.2‰~ 2.1‰, that is from magmatic. SHRIMP U-Pb age of Zircons from the sercite phylite in the Tieshajie formation is age of 902±23 Ma and the age from spilite of it is 1153.4±38.4 Ma, which are products of Mesoproterozoic.Isotope-dating shows Cu-Pb-Zn polymetallic mineralization events existed between Mount.Huang gang volcanic basin and Mount. Tong bo volcanic basin in the early Cretaceous period,The genesis type is volcano - subvolcanic (porphyry) type. Pb-Zn deposit metallogenic mass in Shengmikeng is trachyporphyry. SHRIMP U-Pb age of Zircons from trachyporphyry is 138.3±1.4 Ma. Geochemical characteristics indicate that the volcanic- intrusion rocks in Shengmikeng deposit are“S-type”granite which are depleted in sodium , enriched in potassium and LREE . Those rocks in Shengmikeng deposit are of the calc-alkaline series and Eu of them is general depleted .The age of ore-bearing rhyolite porphyry zircon SHRIMPU - Pb is 137Ma in Caijiaping.Papers summarized copper polymetallic mineralization rules of the Northern Wuyi region. The formation, evolution output and spread of the copper polymetallic deposits in time shows that the characteristic of polyphasic mineralization and the large-scale mineralization in the middle-Jurassic and early- Cretaceous. It also shows accumulative deposits in the margin of block and volcanic basin along NNE and near EW compound zone spatially; it shows superimposing in multiple epochs and polymerizing in varied kinds. The excellent geological conditions of large deposits-forming are compound ore-controlling of strike-slip shearing– extension and nappe tectonics, and superimposed and compound multi-level tectonic environment.Finally yongping, Tieshajie and Lengshuikeng metallogenic prediction model are built. The paper divides the northern Wuyi area of Jiangxi, determined 2 metallogenic belts which is in fourth rank and delineates 11 metallogenic prospecting areas which is in fifth rank(there are 4 A order metallogenic prospecting areas , 5 B order metallogenic prospecting areas and 2 C order metallogenic prospecting areas),then demonstrates the ore Prospecting of Cu polymetallic deposit; The paper estimates the resources Preliminarily, the results show that the prospecting potential of Cu polymetallic deposit is huge in north Wuyi area . |
PDF Full Text Request