Zircon U-Pb Geochronology of the Bijigou V-Ti Magnetite Deposit in Hannan, Shaanxi Province, and Its Significance

CHEN Long-yao; CUI Jian-jun; LIU Xiao-chun; QU Wei; LI Miao; ZHENG Guang-gao; LI Dong-dong; ZHANG Hai-feng; LIU Lin

doi:10.3975/cagsb.2017.04.07

2017 No. 4

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Article navigation > Acta Geoscientica Sinica > 2017 > (4): 505-512

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CHEN Long-yao, CUI Jian-jun, LIU Xiao-chun, QU Wei, LI Miao, ZHENG Guang-gao, LI Dong-dong, ZHANG Hai-feng, LIU Lin. Zircon U-Pb Geochronology of the Bijigou V-Ti Magnetite Deposit in Hannan, Shaanxi Province, and Its Significance[J]. Acta Geoscientica Sinica, 2017, (4): 505-512. doi: 10.3975/cagsb.2017.04.07

Citation:

CHEN Long-yao, CUI Jian-jun, LIU Xiao-chun, QU Wei, LI Miao, ZHENG Guang-gao, LI Dong-dong, ZHANG Hai-feng, LIU Lin. Zircon U-Pb Geochronology of the Bijigou V-Ti Magnetite Deposit in Hannan, Shaanxi Province, and Its Significance[J]. Acta Geoscientica Sinica, 2017, (4): 505-512. doi: 10.3975/cagsb.2017.04.07

Zircon U-Pb Geochronology of the Bijigou V-Ti Magnetite Deposit in Hannan, Shaanxi Province, and Its Significance

Publish Date: 15 July 2017

Abstract

Abstract

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.
- Bijigou /
- Hannanmafic-ultramafic complex /
- V-Ti magnetite deposit /
- zircon U-Pb ages