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地质学报 2015
PaleozoicTectono-MetallogenyintheTianshan-AltayRegion,CentralAsia, PP. 1120-1132 Keywords: tectonics,endogenicmetallogeny,longdistanceeffect,Tianshan-Altayregion Abstract: TheresearchonPaleozoictectonicsandendogenicmetallogenyintheTianshan-AltayregionofCentralAsiaisanimportantandsignificantproject.TheAltayregion,asacollisionzoneoftheEarlyPaleozoic(500？397Ma),andtheTianshanregion,asacollisionzoneoftheearlyperiodintheLatePaleozoic(LateDevonian-EarlyCarboniferous,385？323Ma),arealltheresultofnearlyN-Strendingshorteningandcollision(accordingtorecentmagneticorientation).IntheLateDevonian-EarlyCarboniferousperiod(385？323Ma),regionalNWtrendingfaultsdisplayedfeaturesofdextralstrike-slipmotionintheAltayandJunggarregions.IntheTianshanregion,nearlyEW-trendingregionalfaultsaremotionsofthethrusts.However,intheLateCarboniferous-EarlyPermianperiod(323？260Ma),influencedbythelong-distanceeffectinducedfromtheUralcollisionzone,thoseareassufferedweakereastwardcompression,theexistingNWtrendingfaultsconvertedintosinistralstrike-slipintheAltayandJunggarregions,andtheexistingnearlyE-Wtrendingfaultstransferredintodextralstrike-slipfaultsintheTianshanregion.TheRocksofthoseregionsintheLateCarboniferous-EarlyPermianperiod(323？260Ma)weremoderatelyrupturedtoacertaintension-shear,andthusformedanumberofworldfamousgiantendogenicmetaloredepositsintheTianshan-Altayregion.AstotheCentralAsiancontinent,themostpowerfulcollisionperiodmaynotcoincidewiththemostfavorableendogenicmetallogenicperiod.Itshouldbetreatedto“theorogenicmetallogenyhypothesis”withcautioninthatregion.
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