Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (5): 1436-1446.doi: 10.13278/j.cnki.jjuese.201505115

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Geochemistry and Magma Source Characteristics of the Cretaceous Granites from Xiaoxinancha in Hunchun, Jilin

Fu Changliang1, Sun Deyou2, Wei Hongyan1, Gou Jun2   

  1. 1. China Aero Geophysical Survey & Remote Sensing Center for Land and Resources, Beijing 100083, China;
    2. College of Earth Sciences, Jilin University, Changchun 130061, China
  • Received:2014-12-30 Published:2015-09-26

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Abstract:

The Cretaceous granites from Xiaoxinancha in Hunchu area consist predominantly of tonalites and granodiorites. The tonalites belong to sodic calc-alkaline series (Na2O/K2O=1.99-2.76), and are characterized by high Al2O3 (15.46%-17.13%) and Sr (559×10-6-731×10-6), high Sr/Y (40-78) and La/Yb (16-21) ratios, but low Y (9×10-6-14×10-6) and Yb (0.8×10-6-1.3×10-6), similar to adakites. The granodiorites are high K and calc-alkaline. Na2O/K2O and Sr/Y ratios fall in the ranges of 1.01 to 1.56, 13 to 32 respectively, Sr and Yb contents are 312×10-6 to 410×10-6, 1.23×10-6 to 2.13×10-6 respectively, features of high-potassium calc-alkaline I-type granites. Both tonalites and granodiorites were resulted from partial melting of the basaltic lower crust. The tonalitic magmas were generated under a pressure greater than 1.0 Gpa and a depth over 33 km, while the granodioritic magmas were produced under a relatively lower pressure (0.8-1.0 GPa) and a depth from 26 km to 33 km.

Key words: granite, geochemistry, magma source, Xiaoxinancha

CLC Number: 

  • P588.12

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