The Paleozoic Magmatic Activity And Tectonic Significance In The Area Of The Southwest Tarim,xinjing,yecheng,qipan

Study of intrusive rocks,volcano rock system through the distribution of the Yecheng boardarea of the Paleozoic era,from the limited field characteristics, chemical analysis and isotope age of the earth,the use of various types of tectonic discrimination diagrams,and combined with the results of previous studies, the Paleozoic rocks can be divided into two tectonicgenetic types:high potassium calc alkaline series(Caledonian)and alkaline series of rocks(Hercynian).Calcium alkaline or high in potassium calc-alkaline series rock(128 km, jerlun rock mass, datong west, qiao PuHe rock mass, cukor Sue rock mass), LREE and LILE enrichment, HFSE relative losses, of which 128 km and jerlun rock mass of the Sr, Nd and O isotopic compositions show curtain shell mixed source characteristics. Alkali rock series, alkali rich, rich HFSE, and LILE apparent loss.Early Paleozoic tectonic, late caledonian period produced a large number of orogenic granite, suggest that the original tethys ocean have been closed.Early devonian system diabasic(408.5±7.3Ma) dike large-scale invasion, marking the end of caledonian orogeny; Mezzanine shaped output on the board(P2q) set of early Permian columnar basalt(298.3±2.8Ma), on behalf of the late Paleozoic tension cracking effect again. The Paleozoic magmatic activity in the study area, on the whole, from kai-fang zhang environment to squeeze the closed environment.