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Zircon U‐Pb dating, Geochemical Features of the Halunwusu Composite Granites at the Northern Edge of Southern Qilian, Qinghai
Author(s) -
TAO Gang,
ZHU Lidong,
YANG Wenguang,
LI Zhiwu,
XIE Long
Publication year - 2017
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.13201
Subject(s) - zircon , geology , geochemistry
2.2 Geochemical Analysis The early adamellite to granodiorite is characterized by the mass fraction of SiO2(62.73%~67.73%)and Al2O3(14.96%~16.48%),the value of A/CNK is 0.87~1.07. The late granite is characterized by the mass fraction of SiO2(69.99%~73.88%)and Al2O3(13.53%~ 14.59%),the value of A/CNK is 1.00~1.22.The total REE contents range from 106.68×10 to 329.81×10, the ratio of LREE/HREE is between11.87 and 28.71, and show weak anomaly of Eu(δEu=0.53~0.92),representing the fractional crystallization of the Plagioclase and K-Feldspar during magmatic evokution.With the similar trace element distribution,the enrichment of LILE(Rb,Th,K,Pb) and depletion of HSFE(Nb,Ta,P,Ti) imply the Halunwusu Composite Granites mainly derived