Adakites related to subduction in the northern margin of Junggar arc for the Late Paleozoic: Products of slab melting |
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Authors: | Jifeng Xu Houjun Mei Xueyuan Yu Zhenghua Bai Hecai Niu Fanrong Chen Zuoping Zhen Qiang Wang |
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Institution: | (1)Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640 ,China |
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Abstract: | Volcanic rocks with adakitic compositional signature have been recognized in the northern margin of ancient Junggar island arc for the Late Paleozoic. These adakites for the early Devonian from the Tuoranggekudouke Group (D1t) are characteristic of high Sr, Sr/Y and (La/Yb)N but low Y, Yb and HREE. Their compositional characteristics are much similar to those of the typical adakites in the world but distinct from those of the normal arc volcanic rocks from the same Group. We conclude that these adakitic volcanic rocks were produced by slab melting during the early period of Paleoasia-ocean lithosphere subduction. This infers that the Paleoasia Ocean in the north Junggar area began a new subduction process in the early Devonian. |
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Keywords: | adakite volcanic rocks Paleoasia Ocean subduction Junggar Xinjiang |
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