Advances in Earth Science ›› 2016, Vol. 31 ›› Issue (1): 66-77.

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Back-arc Basin Basalt(BABB)Data Mining: Comparison with MORB and IAB

Yang Jing 1, Wang Jinrong 1, *, Zhang Qi 2, Chen Wanfeng 1, Pan Zhenjie 1, Jiao Shoutao 2, Wang Shuhua 1   

  1. 1.Key Laboratory of Mineral Resources in Western China (Gansu Province), School of Earth Sciences, Lanzhou University, Lanzhou 730000, China;
    2. Institute if Geology and Geophysice, China Academy of Sciences, Beijing 100029, China
  • Online:2016-01-10 Published:2016-01-10
  • About author:First author: Yang Jing(1991-),female, Jinchang City, Gansu Province,Master graduate student. Research areas indude lithospheric evolution and mineralization. E-mail: yangjing14@lzu.edu.cnCorresponding author: Wang Jinrong(1958-),male, Putian City, Fujian Province, Professor. Research areas include petro-tectonic. E-mail: jrwang@lzu.edu.cn
  • Supported by:

    Project supported by the Science Technology of Gansu Province "the West Section of Qilian Orogenic Belt Shibandun iron deposit ore-occurred strata and prospecting prediction research"(No.1002FKDA042); The Fundamental Research Funds for the Central Universities "Magma series and Tectonic significance at Yema Nanshan in the Western Section of the MidQilian"(No.lzujbky-2013-113)

Yang Jing, Wang Jinrong, Zhang Qi, Chen Wanfeng, Pan Zhenjie, Jiao Shoutao, Wang Shuhua. Back-arc Basin Basalt(BABB)Data Mining: Comparison with MORB and IAB[J]. Advances in Earth Science, 2016, 31(1): 66-77.

Back-Arc Basin Basalts(BABB) distribute narrowly in the world. Currently, BABB are mainly distribute in the western Pacific Ocean outside the island arc in small scales and short lifespan which are related with subduction. It is generally considered that geochemical compositions of BABB vary in a large scale, including N-MORB, E-MORB, IAB, and a small amount of OIB. In most of basalt discrimination diagrams, BABB mainly fall into MORB area, suggested that BABB are similar to MORB. New data of MORB shows that MORB contain a series of constituents from MORB to OIB, also IAB, while BABB are mainly composed by MORB and IAB, rarely show OIB components. BABB is generally analogous with MORB whereas the former is enriched in Cs, Rb, U, Ba, Th, Pb, and other incompatible elements, exhibits an obvious Nb-Ta negative abnormal, suggesting that BABB is featured with both geochemical characteristics of MORB and IAB, with subuduction sediments partition during its magmatism process. It is mainly formed by partial melting in wet environment. Back-arc basins are divided into two groups: mature ones and immature ones. Primary back-arc basins share some geochemical characteristics of island arcs while mature back-arc basins exhibit few IAB features and is closer to MORB.

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