Geochemical characteristics of amphiboles in the rhyolite from the southern Okinawa Trough, and its implication for petrogenesis

Chen Zuxing; Zeng Zhigang; Wang Xiaoyuan; Yin Xuebo; Chen Shuai; Li Xiaohui; Qi Haiyan

doi:10.3969/j.issn.0253-4193.2017.12.008

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Chen Zuxing, Zeng Zhigang, Wang Xiaoyuan, Yin Xuebo, Chen Shuai, Li Xiaohui, Qi Haiyan. Geochemical characteristics of amphiboles in the rhyolite from the southern Okinawa Trough, and its implication for petrogenesis[J]. Haiyang Xuebao, 2017, 39(12): 74-89. doi: 10.3969/j.issn.0253-4193.2017.12.008

Citation:

Chen Zuxing, Zeng Zhigang, Wang Xiaoyuan, Yin Xuebo, Chen Shuai, Li Xiaohui, Qi Haiyan. Geochemical characteristics of amphiboles in the rhyolite from the southern Okinawa Trough, and its implication for petrogenesis[J]. Haiyang Xuebao, 2017, 39(12): 74-89. doi: 10.3969/j.issn.0253-4193.2017.12.008

Citation:

Chen Zuxing, Zeng Zhigang, Wang Xiaoyuan, Yin Xuebo, Chen Shuai, Li Xiaohui, Qi Haiyan. Geochemical characteristics of amphiboles in the rhyolite from the southern Okinawa Trough, and its implication for petrogenesis[J]. Haiyang Xuebao, 2017, 39(12): 74-89. doi: 10.3969/j.issn.0253-4193.2017.12.008

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Geochemical characteristics of amphiboles in the rhyolite from the southern Okinawa Trough, and its implication for petrogenesis

doi: 10.3969/j.issn.0253-4193.2017.12.008

1.
Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Graduate School of Chinese Academy of Sciences, Beijing 100049, China
2.
Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China;Graduate School of Chinese Academy of Sciences, Beijing 100049, China
3.
Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China
4.
Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China

Received Date: 2017-03-28
Rev Recd Date: 2017-06-18

Abstract

Abstract

In order to reveal the petrogenesis of the rhyolite from the southwestern Okinawa Trough, the major and trace elements of the amphibole phenocrysts in the rhyolite were measured by electron probe and LA-ICP-MS. The composition variation range of major elements of all the amphiboles is small, the crystal chemistry show Ca_B>1.60, Ca_A=0, (Na+K)A<0.33, Na_B is between 0.23 and 0.39, that belong to calcic series and classify as magnesiohornblendes. Trace elements are characterized by enrichment of Sc, V, Cr, Co, Ni and REE, loss Rb, Sr, Ba, Zr, Th, U and Pb. The enrichment and loss of these elements are related to complex role of isomorphic replacement. Based on the amphibole geothermobarometer, the temperatures and pressures are 775 to 839℃ and 0.12 GPa, roughly equivalent to the depth of 4 km. Genetic mineralogy studies have shown that amphibolite in the rhyolite is a crust-mantle mixing origin, further indicating that the rhyolite was most likely formed by mixing a mantle-derived basaltic magma with a crustal felsic magma, followed by extensive fractional crystallization in the shallow chamber, and crust-mantle mixed source is likely to be the main source of the volcanic rocks from southwest Okinawa Trough.
- amphibole,
- major and trace elements,
- rhyolite,
- Okinawa Trough

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References(62)

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