Intrusive Magmatic Of Sequence Establishes And Tectonic Significance Of Chonghuer In Western Part Of Aertay Mountain, Xinjiang

The study area is located north edge of ERQISI great faults, national borders in the northwest. Magmatic activity is strong in the study area, rock type is complex, predecessors to its made more geological work. But less research to intrusive rock in the western part of the orogenic belt ARTAI. By means of isotope chronology, Petrology, geochemistry and field geological, this paper has discussed the magmat ic sequence of intrusive rock in the area of the CHONG HU ER the west part of ARTAI mountain in XIN JIANG,and provide an important basis for the magmatic sequence of intrusive rocks, petrogenesis, and research of tectonic setting in the study area. We achieved the following understanding:This paper on the basis of 1:50000 results of regional survey, Selected four rock mass and according to the route information, profile information and zircon U-Pb Geochronology data. Finaly, determine its invasion sequence, type petrogenesis and tectonic setting.By U-Pb dating of data analysis, the magmatic intrusion sequence are divided into two sequence such Ordovician intrusive sequence and Late Silurian- Early Devonian intrusive sequence; Its LA-ICP-MS age: KA LA SI gneissic biotite monzonite granite 473.3±2.9Ma,BI LIE WU TI XI biotite granite 469.8 ± 2.9Ma, A YOU TE SHAN broken gneissic biotite monzonite granite 455.3 ± 3.1Ma, TE KE LI KE gneissic tonalite rocks 420.6 ± 3.0Ma and 414.8 ± 2.6Ma.Intrusive rocks of Ordovician sequence having the same geochemical characteristics,such the High silicon, high alkali, potassium, Over-saturated aluminum, belong to calc-alkaline series; Having LREE enrichment, HREE fractionation obvious, its causes should be part of the continental crust molten mass. Late Silurian- Early Devonian intrusive rock sequences have LREE enrichment, HREE loss, LREE fractionation obvious characteristics, its causes partial melting of continental crust.After petrochemical characteristics of trace REE geochemical characteristics Research, and the discrimination diagram of the type of rock Causes, we Learned Ordovician intrusive rock sequences are S-type granites, Late Silurian- Early Devonian intrusive rock sequence are I-Stype granites;In the study area,Sinian tectonic movement(stretch) make foreign fold, returnees in the MONG GU- A ER TAI ocean, Finally, close the Ordovician ancient Asia ocean dive to Siberian subduction formed acidic volcanic rocks in XI LE KE group of the east of KA NA SI area.Devonian are main period of subduction-collision orogenic. Finally,epicontinental active belt of A ER TAI consolidated into a new continental crust and into the land within the development stage.