Study On Metallogenic Mechanism And Prediction Using Multi-source Information Of Tuwu-Yandong Porphyry Copper Ore Belt In Xinjing

Tuwu-Yandong porphyry copper ore belt in Xinjiang is one of the large ore deposit cluster having larger prospect in East Tianshan area. Metallogenic prognosis research of Tuwu-Yandong porphyry copper ore belt in Xinjiang by using integrated approach of mineralization synthetic information supported by geographical information system (GIS) is conduces to exploratory development of porphyry copper in east Tianshan area and rich metallogenic theory and exploratory development of large scale and superhuge porphyry copper. In this paper, based on the new data of field geology, mineral, geophysics, geochemistry and remote sensing, under the direction of mineralization prognosis theory of synthetic information and geologic anomaly and mineralization theory of plate tectonics, by using mineralization prognosis research approach and technique of synthetic information supported by GIS, geologic setting, mine belt Metallogenic conditions and deposit Metallogenic features of regional metallogeny multiple information for Tuwu-Yandong porphyry copper belt were discuss, Metallogenic Regulation of East Tianshan metallogenic province and Tuwu-Yandong porphyry copper ore belt were revealed, metallogenic model of typical deposit and ore-prospecting model of synthetic information for Tuwu-Yandong porphyry copper ore belt were initially established, metallogenic prognosis research was developed and quantitative prediction results of locality geologic anomaly in some part of research area were gained. The chiefly innovative achievements obtained in this paper are as follows:1) New mineralization multi-source information of geophysics, geochemistry, remote sensing and field geology investigation for Tuwu-Yandong porphyry copper ore belt were obtained; the viewpoint that porphyry copper belt formed from island arc setting and metallogenic rock body having Adakite characteristics was further confirmed.Tuwu-Yandong porphyry copper ore belt was formed in island-arc belt tectonic setting in the butt joint fringes of two plates, was closely related to E-W direction linear fracture structure and cyclical magmatic origin organization, and has exceptional geophysics, geochemistry and remote sensing background; Ore-bearing rock which has Metallogenic features of multiple source and multiple phase and easily is subvolcanic lithofacies under Penguin Mountain volcanic-eruptive cycle enrichment mineralize on the top of Adakite rock; with the affections of basal discordogenic fault-Kangguertage discordogenic fault and ductile deformation shear belt, the Metallogenic conditions of porphyry copper are intermediate and acidic magmatic rock with multiple source and multiple phase, granite-porphyry and diorite-porphyrite as apophysal and dikes derived by intermediate and acidic magmatic rock with epizonal and super epizonal subvolcanic lithofacies and neutral and basic volcanic rock and clastic rock construction in Penguin Mountain group, in a word, porphyry copper is the coupling production of structure-magmatic-fluid2) The regularity of porphyry copper metallogenic belt and the typical deposit forming mechanism of Tuwu-Yandong were explored. The copper mine belt was formed from the metallogenic model that dominated by magmatic hydrothermal fluids, and controlled by an island arc of collage and proliferation, tectonic magma and formation.East Tianshan metallogenic area has four metallogenic belts in the space distribution and four stages of evolution correspondingly by time. The four metallogenic belts includes porphyry Cu-polymetallic metallogenic belt, Au-Cu-poly metal sulfide metallogenic belt, Fe(Cu)-Ag-ploymetallic metallogenic belt, and Fe-Pb-Zn-Ag-ploymetallic metallogenic belt in Zhongtianshan district form north to south. The porphyry Cu-polymetallic metallogenic belt is located at the island arc of collage and proliferation which is in the active edge of the butt type of the Junggar and Tarim plate. It is influenced by kangguertage discordogenic fault, its derived fractures, or volcanic apparatus. The metallogenic belt has regular multiple phase mineralizations in geologic period, which is concerned with tectonic-magmatic effects in the stage of subduction-collision, from the late Early Carboniferous to the late Late Carboniferous. The upper mantle and partial melting of oceanic crust were the main metallogenic material sources, and the magmatic hydrothermal fluids and atmospheric precipitation played a key roled in the source of ore-forming fluids. As a result, the porphyry Cu-polymetallic metallogenic belt has a mineralization model relying mainly on magmatic hydrothermal fluid.3) The ore-prospecting model of integrated information supported by GIS is created in the Tuwu-Yandong porphyry copper ore belt, the favorable parts for bonanza ores for Cu-Au anomaly and ore-prospecting targets for geological anomaly are forecasted and determined. This model is the integrated metallogenic space information of geophysics, geochemistry, geology of ore deposits supported by GIS system, and the kernel of it is a regional ore-prospecting, belt marks, deposits and other spatial information signs. The copper prognostic map (E92°00'-93°00', N42°00'-42°20'), about the under half-size pieces of the Dacaotan chart, has been made by the MAPGIS by analyzing the geological, mineral, geochemical and remote sensing data (1:200000). A total of 15 possible sites of feasible ore-prospecting segments were given after prediction, 13 favorable areas for Cu-Au anomaly were obtained with a total area of 342.67 km2. The result shows that the distribution of geological anomaly ore-prospecting targets is consistent with the feasible and favorable prospecting segments by forecasting.This paper has 51figures, 23 tables, 148 references.