Research On Geochemical Characteristics Of Diabase In Alatuntage Area,Yuli City,Xinjiang

Kuruktage region's diabase is one of the most developed areas in Xinjiang,In eastern rigions there has been a lot of research,but in the western region,there has not been studied systematically.which severely restricts the understanding of the tectonic evolution and the mineralization rule of the Kuruktage metallogenic belt.This paper to do systematic research on the Alatuntage areas in the west of Kuruktage.This project based on the Geology Resources of Alatuntage areas in Yuli City,Xinjiang.Through the using of field investigation,geological,geophysical,geochemical and remote sensing integrated results data,Selecting the diabase of Alatuntage areas as example,These diabase are compared and analyzed from the aspect of geologic characteristic,source of basic magma and geotectonic background.we did a experiment about the whole rock,s geochemical analysis of the diabase and ues graphic analytic method to analyse.On this basis,we carried out the study on petrogenesis,magmatic evolution and diagenetic tectonic dynamics:1?After the analysis of geochemical elements,the diabase belong to metaluminous calc-alkaline series basalt.The Cottine index shows this area belong to orogenic belt.2?Alatuntage areas' s diabase geochemistry of trace elements and rare earth element ‘s shows some conclusion.With enriched content of LILE(Rb,K)and loss of HFSE(Nb,Ta),trace elements proforms a rightist distribution like arc volcanic rocks.The REEs compositions of the samples are similar,with enrichment in LREEs and loss of HREEs,almost no Eu anomaly and negative Ce anomalies are not obvious.The diabase which related to subducion and collision.3?According to Ta/Yb—Th/Yb,2Nb—Zr/4—Y,?—?,Ta/Hf—Th/Hf,Hf/3—Th—Ta tectonic environmental diagrams show that the diabase in Alatuntage is the oceanic island besalts.The diabase may be formed in the asthenosphere upwelling of mantle lithosphere transformation background and formed collision tectonic background.4?To summarize,the major momentum causes of the diabase formation of the district are by the control of the southern Tianshan ocean plate subduction and the result of ocean crust mantle delamination?Meanwhile,the Pacific plate post-extrusion stress are relatively weakened,resulting in upwelling of mantle material,Underplating the lower crust,rock partial melting and formated?...