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Zircon U-Pb geochronology and elemental and Sr–Nd isotope geochemistry of Permian mafic rocks in the Funing area, SW China
Mei-Fu Zhou;  Jun-Hong Zhao;  Liang Qi;  Wenchao Su;  Ruizhong Hu
2006
Source PublicationContributions to Mineralogy & Petrology
Volume151Issue:1Pages:1-19
Abstract

Mafic-layered intrusions and sills and spatially associated andesitic basalts are well preserved in the Funing area, SW China. The 258±302Ma-layered intrusions are composed of fine-grained gabbro, gabbro and diorite. The 260±302Ma sills consist of undifferentiated diabases. Both the layered intrusions and volcanic rocks belong to a low-Ti group, whereas the diabases belong to a high-Ti group. Rocks of the high-Ti group have FeO, TiO 2 and P 2 O 5 higher but MgO and Th/Nb ratios lower than those of the low-Ti group. They have initial 87 Sr/ 86 Sr ratios (0.706–0.707) lower and 07Nd (611.5 to 610.6) higher than the low-Ti equivalents (0.710–0.715 and 619.6 to 614.0, respectively). The high-Ti group was formed from relatively primitive, high-Ti magmas generated by low degrees (7.3 –9.5%) of partial melting of an enriched, OIB-type asthenospheric mantle source. The low-Ti group may have formed from melts derived from an EM2-like, lithospheric mantle source. The mafic rocks at Funing are part of the Emeishan large igneous province formed by a mantle plume at 6526002Ma.

KeywordVolcanic Rock inductively Couple Plasma Mass Spectrometry mantle Source mantle Plume mafic Rock
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8121
Collection矿床地球化学国家重点实验室
Affiliation1.Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China
2.Department of Earth Sciences, University of Hong Kong, Hong Kong, Peoples Republic of China
Recommended Citation
GB/T 7714
Mei-Fu Zhou;Jun-Hong Zhao;Liang Qi;Wenchao Su;Ruizhong Hu. Zircon U-Pb geochronology and elemental and Sr–Nd isotope geochemistry of Permian mafic rocks in the Funing area, SW China[J]. Contributions to Mineralogy & Petrology,2006,151(1):1-19.
APA Mei-Fu Zhou;Jun-Hong Zhao;Liang Qi;Wenchao Su;Ruizhong Hu.(2006).Zircon U-Pb geochronology and elemental and Sr–Nd isotope geochemistry of Permian mafic rocks in the Funing area, SW China.Contributions to Mineralogy & Petrology,151(1),1-19.
MLA Mei-Fu Zhou;Jun-Hong Zhao;Liang Qi;Wenchao Su;Ruizhong Hu."Zircon U-Pb geochronology and elemental and Sr–Nd isotope geochemistry of Permian mafic rocks in the Funing area, SW China".Contributions to Mineralogy & Petrology 151.1(2006):1-19.
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