Geochemistry of Cretaceous granites from Mianning in the Panxi region, Sichuan Province, southwestern (SW) China: implications for their generation

	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
发表期刊	Journal of Asian Earth Sciences
卷号	29 期号:5 页码:737-750
摘要	The 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.
关键词	Cretaceous Granites Geochemistry A-type Crustal Source Panxi Region
学科领域	矿床地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/6796
专题	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
推荐引用方式 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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