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Geochemistry of Cretaceous granites from Mianning in the Panxi region, Sichuan Province, southwestern (SW) China: implications for their generation
Cheng Xu; Zhilong Huang; Liang Qi; Pingqing Fu; Congqiang Liu; Endong Li; Tao Guan
2007
Source PublicationJournal of Asian Earth Sciences
Volume29Issue:5Pages:737-750
AbstractThe Cretaceous granites of Mianning, located in the northern Panxi region, were emplaced after collision of the Tibetan Plateau and Yangtze Block. These granites have very high K2O + Na2O, Ga, Zr, Nb, Y, REE (except Eu), and very low MgO, CaO, P2O5, and Sr contents relative to M-, I- or S-type granites. Based on the chemical discrimination criteria of Whalen et al . [Whalen, J.B., Currie, K.L., Chappell, B.W., 1987. A-type granites: geochemical characteristics, distribution and petrogenesis. Contributions to Mineralogy and Petrology 95, 407–419], most of them are A-type granites. Moreover, the granites plot in the range of post-collision granites and belong to the A2 type. Elevated initial Sr isotopic ratios (>0.72) suggest their derivation dominantly from a crustal source. These features are consistent with granite formation in a post-orogenic setting, such as after subduction or collision between of the Tibetan Plateau and Yangtze Block. In addition, the granites are characterized by low abundances of Ba, Sr, P, Ti, and Eu, positive correlation between Ba and Eu anomalies, and negative correlation between Rb and K/Rb. Plots of Rb vs. Sr suggest that fractional crystallization affected the final compositions of these granites after melting from a dominantly crustal source. From the late Proterozoic to late Mesozoic, the crustal composition, compared to that of the mantle, appears to have increased in the Panxi region. While the mantle component played an important part in the generation of Cretaceous granites in southeastern China, its influence was relatively minor in the Panxi region. Thus, there was a significant difference in mantle evolution between southeastern China and the Panxi region, which led to different metallogenic processes.
KeywordCretaceous Granites Geochemistry A-type Crustal Source Panxi Region
Subject Area矿床地球化学
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/352002/6796
Collection矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文
Recommended Citation
GB/T 7714
Cheng Xu,Zhilong Huang,Liang Qi,et al. Geochemistry of Cretaceous granites from Mianning in the Panxi region, Sichuan Province, southwestern (SW) China: implications for their generation[J]. Journal of Asian Earth Sciences,2007,29(5):737-750.
APA Cheng Xu.,Zhilong Huang.,Liang Qi.,Pingqing Fu.,Congqiang Liu.,...&Tao Guan.(2007).Geochemistry of Cretaceous granites from Mianning in the Panxi region, Sichuan Province, southwestern (SW) China: implications for their generation.Journal of Asian Earth Sciences,29(5),737-750.
MLA Cheng Xu,et al."Geochemistry of Cretaceous granites from Mianning in the Panxi region, Sichuan Province, southwestern (SW) China: implications for their generation".Journal of Asian Earth Sciences 29.5(2007):737-750.
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