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Chalcophile element constraints on magma differentiation of Quaternary volcanoes in Tengchong, SW China
Xiao-Wen Huang;  Mei-Fu Zhou;  Christina Yan Wang;  Paul T. Robinson;  Jun-Hong Zhao;  Liang Qi
2013
发表期刊Journal of Asian Earth Sciences
卷号76页码:1-11
摘要

The Tengchong volcanic field comprises numerous Quaternary volcanoes in SW China. The volcanic rocks are grouped into Units 1–4 from the oldest to youngest. Units 1, 3 and 4 are composed of trachybasalt, basaltic trachyandesite and trachyandesite, respectively, and Unit 2 consists of hornblende-bearing dacite. This rock assemblage resembles those of arc volcanic sequences related to oceanic slab subduction. Rocks of Units 1 and 3 contain olivine phenocrysts with Fo contents ranging from 65 to 85 mole%, indicating early fractionation of olivine and chromite prior to the eruption of magma. All the rocks from Units 1, 3 and 4 have very low PGE concentrations, with <0.05 ppb Ru and Rh, <0.2 ppb Pt and Pd, and Ir that is commonly close to, or slightly higher than detection limits (0.001 ppb). The small variations of Pt/Pd ratios (0.4–2.2) are explained by fractionation of silicate and oxide minerals. The 5-fold variations in Cu/Pd ratios (200,000–1,000,000) for the lavas at Tengchong, which do not vary systematically with fractionation, likely reflect retention of variable amounts of residual sulfide in the mantle source. In addition, all the rocks from Units 1, 3 and 4 have primitive mantle-normalized chalcophile element patterns depleted in PGE relative to Cu. Together with very low Cu/Zr ratios (0.06–0.24), these rocks are considered to have undergone variable degrees of sulfide-saturated differentiation in shallow crustal staging magma chambers. Large amounts of olivine and chromite crystallization probably triggered sulfide saturation of magma at depth for Units 1 and 3, whereas crustal contamination was responsible for sulfide saturation during ascent of magma for Unit 4.

关键词Arc-like Volcanic Rocks Platinum-group Elements Magma Chamber Processes Tengchong Sw China
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/42920512-1/9399
专题矿床地球化学国家重点实验室
作者单位1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
4.Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
5.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
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GB/T 7714
Xiao-Wen Huang;Mei-Fu Zhou;Christina Yan Wang;Paul T. Robinson;Jun-Hong Zhao;Liang Qi. Chalcophile element constraints on magma differentiation of Quaternary volcanoes in Tengchong, SW China[J]. Journal of Asian Earth Sciences,2013,76:1-11.
APA Xiao-Wen Huang;Mei-Fu Zhou;Christina Yan Wang;Paul T. Robinson;Jun-Hong Zhao;Liang Qi.(2013).Chalcophile element constraints on magma differentiation of Quaternary volcanoes in Tengchong, SW China.Journal of Asian Earth Sciences,76,1-11.
MLA Xiao-Wen Huang;Mei-Fu Zhou;Christina Yan Wang;Paul T. Robinson;Jun-Hong Zhao;Liang Qi."Chalcophile element constraints on magma differentiation of Quaternary volcanoes in Tengchong, SW China".Journal of Asian Earth Sciences 76(2013):1-11.
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