Detrital Zircons Spectrum Of Paleozoic Stratum In Tiekelike,Xinjiang,and It's Implications For Key Geological Events

The Nantiekelike uplift volcano sedimentary rocks of Late Paleozoic area,is the study of the Southwest Tarim Paleozoic paleo geography and iron Crick uplift,the mo st direct carrier of the late Paleozoic tectonic evolution.Based on the distribution of ir on in Crick County of Yecheng late Paleozoic Devonian Carboniferous stratum and P ermian strata rock and Buya area of petrography,clastic rock and principal componen t analysis,trace element and REE geochemistry studies show that the study area of D EVONIAN SEDIMENTARY tectonic setting of active continental margin and contin ental arc,the provenance is mainly quartz carbonate sediments,may be derived from t he passive continental margin source material;Carboniferous Sedimentary tectonic ba ckground of the passive continental margin arc environment,source rock material in q uartzite rock-neutral igneous source zone;sedimentary tectonic background of Permi an strata is continental island arc-continental margin,provenance the main area of th e felsic rocks or neutral sediment source area,a source material may be mixed with pa rt of the passive continental margin area.In addition,the use of LA-ICP-MS U-Pb method of Late Paleozoic sedimentary r ock detrital zircon U-Pb age determination,respectively 59,63 and 52 U-Pb age from Devonian to Permian strata,the detrital zircon U-Pb chronology characteristics and zir con cathodoluminescence image analysis of optical CL,indicating iron Crick area exp erienced multi period magmatic tectonic thermal events and the late Paleozoic proven ance has diversity characteristics,and the samples had the peak value of the early Pale ozoic Carboniferous,Devonian and Permian but the strength is greater than.Among t hem,the Devonian samples of the peak value of detrital zircon 443 Ma indicate that th e development of large-scale magmatite iron Crick area,while the second peak is 824 Ma,1138Ma,detrital zircon 1822 Ma and 2553 Ma respectively showed that the existe nce of the Rodinia supercontinent cracking,Columbia supercontinent aggregation andproliferation,too global tectonic thermal events in iron Crick the Carboniferous samp le area;the peak value of detrital zircon 449 Ma indicate that there are strong magmati sm iron Crick area Neoproterozoic magmatism,indicating the possible presence of the Rodinia supercontinent breakup event,and some metamorphic zircon indicate may b e related to the convergence of the supercontinent Columbia and Tarim palaeocontine ntal core cracking;the peak value of the Permian samples 412 Ma and the peak value of detrital zircon 290 Ma respectively showed that the iron Crick area is developed ext ensively magmatite and Late Ancient The Cenozoic era is related to the Hercynian or ogeny,and the Neoproterozoic magmatic origin and the detrital zircons of some meta morphic origin are related to the Rodinia supercontinent convergence and the Columb ia supercontinent convergence event.In summary,the iron Crick tectonic thermal eve nts of Late Paleozoic strata in the region source area are formed magmatic activity an d Rodinia supercontinent aggregation,Columbia supercontinent and oldland cracking related,indicating the southwestern margin of Tarim basin provides important eviden ce for the study of evolution of global geological events.Detrital zircon age spectrum characteristics and geochemical characteristics anal ysis shows that the iron Crick late Paleozoic sediment source area is the main source r ocks in West Kunlun,mainly from 407~462Ma(Devonian sample),412~496Ma(Car boniferous sample)and 361~462Ma(Permian rock sample),and indicates the early Pa leozoic intrusive rocks in Western Kunlun at the beginning of Devonian to Permian o utcrops,suffered strong erosion.At the same time,West Kunlun is the southern edge of Tarim plate in the late Paleozoic;and part of the zircon age spectrum characteristic s and CL image analysis combined with the instructions,the secondary provenance m ay also exist in the Tarim paleo uplift,Middle Proterozoic to Paleoproterozoic magma tite and ancient Archean basement supply.A total of 10 Devonian and Carboniferous Archean detrital zircon generation UPb age and combined with the existing research results,confirmed the existence of an cient Neoarchaean basement iron Crick area.