| 陕西汉南毕机沟钒钛磁铁矿锆石U-Pb年代学及其意义 |
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| 关键词:Bijigou Hannan mafic-ultramafic complex V-Ti magnetite deposit zircon U-Pb ages |
| 基金项目:中国地质科学院地质力学研究所基本科研费项目(编号: DZLXJK201302)、中国地质调查局地质调查项目“钦杭结合带及邻区深部地质调查”(编号: 121201103000150017)和陕西省矿产资源勘查与综合利用重点实验室基金(编号: 地合字(2013)第01号)联合资助 |
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| Zircon U-Pb Geochronology of the Bijigou V-Ti Magnetite Deposit in Hannan, Shaanxi Province, and Its Significance |
| Situated in the northwest of the Hannan complex on the northern margin of the Yangtze Plate, the Bijigou V-Ti magnetite deposit is a product of the mafic-ultramafic magma differentiation. It consists mainly of olivine gabbro, gabbro, gabbro diorite and diorite, and exhibits clear lithofacies belts and rhythmicity. Several V-Ti magnetite bodies have been found in the gabbro lithofacies belt of mafic-ultramafic complex. In order to find out the metallogenic epoch of the Bijigou V-Ti magnetite deposit, the authors present new laser ablation–multicollector–inductively coupled plasma–mass spectrometry (LA-MC-ICP-MS) U-Pb data for zircons from mineralized gabbro and granite dike in the Bijigou V-Ti magnetite deposit, with the emplacement ages being (783±4) Ma (MSWD=0.09) and (759±4) Ma (MSWD=1.50), respectively. These new ages suggest that the mineralization of the Bijigou V-Ti magnetite deposit occurred at 783 Ma and was not later than 759 Ma. Coupled with previous regional data, the age of the Bijigou mafic-ultramafic rock-containing V-Ti magnetite deposit is similar to that of Neoproterozoic large scale mafic-ultramafic complex with arc properties. It is therefore held that the Bijigou V-Ti magnetite deposit might have been formed on the active continental margin. |
| CHEN Long-yao,CUI Jian-jun,LIU Xiao-chun,QU Wei,LI Miao,ZHENG Guang-gao,LI Dong-dong,ZHANG Hai-feng,LIU Lin.2017.Zircon U-Pb Geochronology of the Bijigou V-Ti Magnetite Deposit in Hannan, Shaanxi Province, and Its Significance[J].Acta Geoscientica Sinica,38(4):505-512. |
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