| Citation: |
DANZHEN Wang-xiu, WANG Li-qiang, WANG Yong, LI Zhi-jun, LI Shen, LI Zhuang. Geochronology and Geochemistry of Main Intrusions of the Gongqiongzuobo Fe-Cu Ore Occurrence in the Western Bangong Co–Nujiang Metallogenic Belt, Tibet and Its Geological Significance[J]. Acta Geoscientica Sinica, 2017, (5): 734-744. doi: 10.3975/cagsb.2017.05.13
|
Geochronology and Geochemistry of Main Intrusions of the Gongqiongzuobo Fe-Cu Ore Occurrence in the Western Bangong Co–Nujiang Metallogenic Belt, Tibet and Its Geological Significance
-
Abstract
This paper reports systematic research about LA-ICP-MS zircon U-Pb age, whole-rock major and trace element of three acid intrusives from the Gongqiongzuobo Fe-Cu deposit. The result of Geochronology testing shows that the weighted average age are 147.0 Ma (Granite porphyry), 143.6 Ma (Monzonitic granite porphyry) and 142.8 Ma (K-feldspar granite) respectively and finds there are three periods of magma activity in Gongqiongzuobo area during Late Jurassic–Early Cretaceous Epoch. The result of geochemistry characteristics shows that (1)Granite porphyry belongs to aluminum-weakly peraluminous Ⅰ-type granite, (2)Monzonitic granite porphyry is high potassium calc-alkine series and belongs to weakly peraluminous Ⅰ-type granite, (3)K-feldspar granite has experienced strong crystallization differentiation and belongs to high differentiation Ⅰ-type granite. Those rocks enrich in Rb Th U Pb and deplete in Nb Ta Ti P, their Nb/Ta ratio are close to continental crust and the zircon has negativeεHf(t)value. All these feature implys rock-forming materials are mainly come from the crust-source. The discoveray of Late–Jurassic skarn-type mineralization has important significance for consummating regional metallogeny and directing regional prospecting. -
-
Access History
Export File
Citation
DANZHEN Wang-xiu, WANG Li-qiang, WANG Yong, LI Zhi-jun, LI Shen, LI Zhuang. Geochronology and Geochemistry of Main Intrusions of the Gongqiongzuobo Fe-Cu Ore Occurrence in the Western Bangong Co–Nujiang Metallogenic Belt, Tibet and Its Geological Significance[J]. Acta Geoscientica Sinica, 2017, (5): 734-744. doi: 10.3975/cagsb.2017.05.13
DownLoad: