| 班—怒成矿带西段躬穷左波Fe-Cu矿区侵入岩年代学及地球化学特征 |
| |
| 关键词:zircon U-Pb dating whole-rock geochemistry Gongqiongzuobo Bangong Co–Nujiang metallogenic belt |
| 基金项目:中国地质调查局地质调查项目(编号: DD20160026);国家自然科学基金项目(编号: 41403040) |
|
| 摘要点击次数: 3589 |
| 全文下载次数: 2074 |
| 摘要: |
| 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 |
| 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 negative εHf(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. |
| DANZHEN Wang-xiu,WANG Li-qiang,WANG Yong,LI Zhi-jun,LI Shen,LI Zhuang.2017.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,38(5):734-744. |
| 查看全文 查看/发表评论 下载PDF阅读器 |