U-pb zircon age, geochemical, and Sr-Nd isotopic constraints on the age and origin of granodiorite porphyries in the Guilong area, southern Yunnan Province, South China | |
Shen Liu; Ruizhong Hu; Caixia Feng; Guangying Feng; Youqiang Qi; Tao Wang; Ian M.Coulson; Yuhong Yang; Chaogui Yang; Liang Tang | |
刊名 | Geochemical Journal |
2013 | |
卷号 | 47期号:1页码:65-77 |
关键词 | Granodiorite Porphyries U-pb Age-dating Origin Southern Yunnan Province South China |
英文摘要 | Associated with several important polymetallic mineral deposits, the origin of the investigated Guilong area granodiorite porphyries (southern Yunnan Province) are presently poorly understood. For this reason we have undertaken a geochronological and geochemical study of these felsic intrusive rocks that includes: U-Pb zircon age-dating, whole-rock geochemical, and Sr-Nd isotopic data, and that are presented and discussed in this paper. Laser ablation inductively coupled plasma mass spectrometry, U-Pb zircon analyses yield an age of 252.5 +/- 1.0 Ma for one sample of the felsic rocks. The Guilong area granodiorite porphyries are characterized by variable and high (Sr-87/Sr-86)(i), ranging from 0.7103 to 0.7143, and relatively low epsilon(Nd)(t) values from -13.1 to -11.6. They also exhibit negative Nb, Ta, Ti and Sr anomalies on a primitive mantle-normalized multi-element diagram. Based upon their petrological and geochemical characteristics, we suggest that these rocks derive through the partial melting of crustal rocks at a shallow level. The parental magmas to the Guilong granodiorite porphyries underwent fractional crystallization of K feldspar, plagioclase, and ilmenite or rutile prior to emplacement. Magma generation at around 250 Ma (during Permian times) occurred in response to tectonic interactions between the Yangtze Platform and other crustal blocks, that provided the heat source and elevated geotherms required for partial melting of crust. |
语种 | 英语 |
内容类型 | 期刊论文 |
源URL | [http://ir.gyig.ac.cn/handle/42920512-1/11131] |
专题 | 地球化学研究所_矿床地球化学国家重点实验室 |
作者单位 | 1.Univ Regina, Dept Geol, Solid Earth Studies Lab, Regina, SK S4S 0A2, Canada 2.Chengdu Univ Technol, Chengdu 610059, Peoples R Chinaept Geol, Solid Earth Studies Lab, Regina, SK S4S 0A2, Canada 3.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China 4.NW Univ Xian, Dept Geol, Xian 710069, Peoples R China 5.NW Univ Xian, State Key Lab Continental Dynam, Xian 710069, Peoples R China |
推荐引用方式 GB/T 7714 | Shen Liu,Ruizhong Hu,Caixia Feng,et al. U-pb zircon age, geochemical, and Sr-Nd isotopic constraints on the age and origin of granodiorite porphyries in the Guilong area, southern Yunnan Province, South China[J]. Geochemical Journal,2013,47(1):65-77. |
APA | Shen Liu.,Ruizhong Hu.,Caixia Feng.,Guangying Feng.,Youqiang Qi.,...&Liang Tang.(2013).U-pb zircon age, geochemical, and Sr-Nd isotopic constraints on the age and origin of granodiorite porphyries in the Guilong area, southern Yunnan Province, South China.Geochemical Journal,47(1),65-77. |
MLA | Shen Liu,et al."U-pb zircon age, geochemical, and Sr-Nd isotopic constraints on the age and origin of granodiorite porphyries in the Guilong area, southern Yunnan Province, South China".Geochemical Journal 47.1(2013):65-77. |
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