Geochemical characteristics,formation age and geological significance of Huangyandi diorite porphyrite in Qixia,Shandong Province
The diorite porphyrite in Qixia area is an important material record of Yanshanian magmatic activity in Jiaodong area,and its age and origin are of great geological significance for the inversion of tectonic evolution and mineralization in Jiaodong area.This paper takes Huangyandi diorite porphyrite in Qixia City as the research object.On the basis of field geological survey,petrography,zircon U-Pb dating and petrological geochemistry were studied.The age of diorite porphyrite is 138.5±1.7 Ma.In addition,a large number of inherited zircons with ages of 1 858.3～1 766.7 Ma,2 538.9～2 351.6 Ma and 2 863.9 Ma are found in the rocks,indicating that there were mixing of crustal materials during magmatic activity.The results of major elements analysis showed that the diorite porphyrite was high K calc-alkaline series.The results of trace element analysis showed that it had the characteristics of enrichment of large ion lithophile elements such as Rb,Sr,Ba and Pb and depletion of high field strength elements such as Ta,Nb and Ti,and it was formed in volcanic arc tectonic environment.The diorite porphyrite in the study area was formed in the tectonic environment of volcanic arc,belonging to typical island arc volcanic rocks,and involved with fluid in the formation process.
万方数据
维普
