p. 1−22
2423-5865
Vol.6/No.1
100 × 10-5 SI, so they belong to the magnetite-series (oxidized). This magmatism is mainly low-K (tholeiite series) and meta-aluminous. The amounts of Zr, Th, Nb and Ti show depletion compared to N-MORB. Trace elements behavior shows a nearly flat pattern. Age of granodiorite body based on U-Pb zircon dating is 99.7±1.8 Ma (Mid-Cretaceous) and 87Sr/86Sr initial ratio is 0.7047. The geochemical signature and 87Sr/86Sr initial ratio in the area suggest volcanic arc magmatism in subduction zone. This magmatism has characteristic such as high Na2O (3-7 %), low K2O (0.12-1 %), high CaO (4-5.7%), low Rb (1-20 ppm), low total REE (<40 ppm), high Ba/Nb, Sm/Yb<2, (La/Yb)N<5, 87Sr/86Sr initial ratio < 0.7045 and εNd: +4.5 show differences with normal granitoids in subduction zones. Geochemical and petrological characteristics indicate melting in relatively low pressure (shallow depth). The lines of evidence demonstrate that formation of this granitoid needs a suprasubduction zone.]]>
p. 23−48
2423-5865
Vol.6/No.1
p. 49−70
2423-5865
Vol.6/No.1
1).]]>
p. 71−85
2423-5865
Vol.6/No.1
p. 87−105
2423-5865
Vol.6/No.1
p. 107−135
2423-5865
Vol.6/No.1
p. 137−148
2423-5865
Vol.6/No.1
p. 149−161
2423-5865
Vol.6/No.1
p. 163−176
2423-5865
Vol.6/No.1
p. 177−197
2423-5865
Vol.6/No.1