The Prospect Of Copper(gold)——polymetallic Ore In The Magmatic,metamorphic And Tectonic Mobile Zone Of Lancangjiang,western Yunnan Province,China

The rnagmatic, metamorphic and tectonic mobile zone of Lancangjiang ,western Yurinan province ,China is an important tectonic mobile zone in western China. Its tectonic location is very special and the geological phenomena are very complex. Moreover, it抯 a mineralize centralize zone and there are lots of nonferrous metal deposits in this area. The researching for this area is very important.Composed by the microplates which were split from the Gandwana and Larauisa lands, it located in their syntaxis zone. Based on thorough researching on its geotectonic dividing and evolution, this area can be divided into three microplates. a. The LanpingSimao microplate, it includes the An抎ing-Tengtiaojiang Palaeozoic ocean floor ophiolite zone, the Weixi-lvchun Mesozoic rift valley, the Lanping-Simao Mesozoic post-collision continental rift, the Lancangjiang Triassic volcanic island curve, Lancangjiang collision suture zone. b. The Changning-Menglian microplate, it includes the Lancang-Ximeng middle and late Proterozoic-Palaeozoic continental edge rift valley, Kejie-Nandinghe suture zone. c. The Baoshan microplatc, it includes Chongshan middle and late ProterozoicPalaeozoic continental metamorphic terrain, Baoshan shelf nfl.As a part of the eastern Tetbyan orogenic zone, it had opened and closed several times in its evolution history. After Devonian-Carboniferous period, the continent was disintegrated. This area was split and began to ocean making and the Carboniferous-Permian period was the main period of expanding, and it had tholeiite series梒alc-alkali rock series梜alibasalt series magmatic activities in this period. At the end of late Permian series, there抯 volcanic-clastic deposit of neritic facies and marine-land alternately facies on the top of volcanic curve .For the deposit of lower Triassic series doesn抰 exist in whole area, the Paleo-Lancan~iang Ocean was closed in later Perrnian.early Triassic period. After three microplate sutured together the last time, the continental transforming period was beginning in this area and the Lanping-Simao terrain became a rift basin along with the sag of whole area. The sag lasted to the Himalayan movement period. At the end of Tertiary, the India plate was sutured to the Eurasia, so the forming of folds and large reversed nappe happened strongly in all strata in this area.Influenced by its tectonic evolution, the metallogenetic characteristic of copperpolymetal deposit are polytime and polyphyletic .In its three main evolution period, different metallogenetic series was formed. a. In Paleo -Tethyan Lancangjiang ocean period, the alkali-basalt-hosted deposits formed in the early expansion period, and the ophiolite serieshosted deposits formed in the main period of expansion and the spilite series rock-hosted deposits formed in the closure period. b. In Mid-Tethyan Lancangjiang ocean period, the basic volcanic rock series-hosted deposits formed in the early expansion period, and the22,Neutral-acid volcanic and subvolcanic rock series-hosted deposits and the hot water spathic iron ore formed in the late expansion period, and the Sb, Hg,As,Au hydrothermal deposits in clastic and carborialite formation formed in sutured period. c. In the continental transforming of rear Lancangjiang ocean, the copper deposit from the Mesozoic-Cenozoic red clastic formation and Neutral-acid magnlatic deposits was formed. Besides , it has other characteristic such as :a. The deposit distributed along with the tectonic-magmatic-heat flow zone. b. The post-metallogenetic transformation action was very strong.On its evolution history ,it formed three main ore strata ,three main metallogenetic series , three main metallogenetic zone .The area metallogenetic model can be concluded to three strata and several channel? The forecasting mark抯 establishing and prospecting area~s delimiting for exploration in this area must take these factors into account.After made full use of the information Of geology, geophysics, geochemistry and mathematical geology in this a...