naa a22 4500 510753981 CHVBK 20180411083115.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1007/s13131-013-0386-1 doi (NATIONALLICENCE)springer-10.1007/s13131-013-0386-1 Geochemistry and petrogenesis of Quaternary volcanism from the islets in the eastern Beibu Gulf: evidence for Hainan plume [Elektronische Daten] [Naisheng Li, Quanshu Yan, Zhihua Chen, Xuefa Shi] Some of the islets in the eastern Beibu Gulf are covered by Quaternary volcano strata. The rock samples from these islets mainly consist of quartz tholeiites (at Shenjiandao), olivine tholeiites (at Linshidao and Xieyangdao) and alkali basalts (at Yangpubi and Jianshidao), and basically represent four periods of the Quaternary volcanism of Hainan Island and its adjacent regions. Except for the samples from Shenjiandao, most of the Quaternary volcanics of these islets belong to alkali magma series. The trace element characteristics of all of these samples show they are OIB (oceanic island basalt) -like, which implies that their deep geodynamic setting may be related to a mantle plume. The Sr-Nd-Pb isotopic compositions show that the mantle source beneath the Quaternary strata can be regarded as a result of binary mixing between a depleted, DMM (depleted MORB mantle)-like source and an enriched mantle type 2 (EM2). The EM2 may be originated from the Hainan mantle plume, and has been metasomatized by carbonaceous fluids released from ancient recycled oceanic crust at an asthenospheric mantle level. These features, together with typical trace element ratios, reflect that the parent magma was not subjected to crustal contamination during its ascent to the surface. This study provides further petrological and geochemical evidence for the existence of the Hainan mantle plume. The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg, 2013 enriched mantle type 2 (EM2) nationallicence mantle source nationallicence Quaternary volcanism nationallicence Hainan mantle plume nationallicence eastern Beibu Gulf nationallicence Li Naisheng National Oceanographic Center, 266071, Qingdao, China aut Yan Quanshu The First Institute of Oceanography, State Oceanic Administration, 266061, Qingdao, China aut Chen Zhihua The First Institute of Oceanography, State Oceanic Administration, 266061, Qingdao, China aut Shi Xuefa The First Institute of Oceanography, State Oceanic Administration, 266061, Qingdao, China aut Acta Oceanologica Sinica Springer Berlin Heidelberg 32/12(2013-12-01), 40-49 0253-505X 32:12<40 2013 32 13131 https://doi.org/10.1007/s13131-013-0386-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s13131-013-0386-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Li Naisheng National Oceanographic Center, 266071, Qingdao, China aut NATIONALLICENCE 700 1- Yan Quanshu The First Institute of Oceanography, State Oceanic Administration, 266061, Qingdao, China aut NATIONALLICENCE 700 1- Chen Zhihua The First Institute of Oceanography, State Oceanic Administration, 266061, Qingdao, China aut NATIONALLICENCE 700 1- Shi Xuefa The First Institute of Oceanography, State Oceanic Administration, 266061, Qingdao, China aut NATIONALLICENCE 773 0- Acta Oceanologica Sinica Springer Berlin Heidelberg 32/12(2013-12-01), 40-49 0253-505X 32:12<40 2013 32 13131 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer