Geochemistry,petrogenesis and tectonic implication of Early Cretaceous A-type rhyolites in Hailar Basin,NE China
作者：ZHENG Han,SUN Xiaomeng
摘要：Early Cretaceous A-type rhyolites of the Shangkuli Formation in the Hailar Basin of NE China exhibit geochemical characteristics of high silicon,alkali,Fe/Mg,Ga/Al,Zr,Pb,HFSEs,and REE contents but low Ca,Ba,Sr and Eu,which meet the criteria of typical reduced A-type granite.The A-type rhyolites are most probably derived from magmatic underplating and partial melting of quartz-feldspathic lower crust,with the lithospheric mantle material involved,due to the extensional deformation of the Erguna-Hulun Fault.Although the A-type rhyolites show A1-type trace elements characteristics,they were formed in a post-orogenic extensional background together with the coeval widespread bimodal volcanic rocks,metamorphic core complexes,volcanic fault basins and metallogenic province in the Sino-Russia-Mongolia border tract.This extension event was related to the collapse of thickened region of the continental crust after the closure of the Mongol-Okhotsk Ocean.
發文機構：College of Earth Sciences
關鍵詞：A-TYPERHYOLITESHailarBASINEarlyCretaceousPETROGENESISLITHOSPHERICextension
分類號： P[天文地球]
- Application of isolation forest to extract multivariate anomalies from geochemical exploration data
- Zircon U-Pb geochronology and geochemistry of granite in Huoluotai area of northern Great Hinggan Range
- Geochronology and geochemistry of Baicaogou tuff in Yanji,NE China and its tectonic implications for Early Cretaceous
- Application of high-density resistivity method for assessing construction safety of Shimodong tunnel in Helong City of Jilin Province
- Computation of waves scattered by inhomogeneous velocity gradient using generalized Born approximation
- Combination of structure tensor and tilt angle in the edge detection of potential field data
- Method for predicting cuttings transport using artificial neural networks in foam drilling
- Logging interpretation method for reservoirs with complex pore structure in Mesozoic-Cenozoic faulted basin around Daqing exploration area
- Structure analysis of shale and prediction of shear wave velocity based on petrophysical model and neural network
- Geochronology,geochemistry and geological significance of Early Cretaceous volcanic rocks from Niangniangshan Formation,Ningwu Basin,middle and lower reaches of the Yangtze River