δ11B signatures of Lesser Antilles Melt Inclusions

Abstract: We present in-situ δ11B signatures, alongside volatile and trace element concentrations, of volcanic hosted melt inclusions (MI’s) from 11 islands along the entire Lesser Antilles arc. A large variation in δ11B values of MI’s, from -2.8‰ to +11.2, ‰, covers much of the global arc range. δ11B values are higher in the central arc (islands of Guadeloupe, Dominica and Martinique) than the north and south segments. δ11B values also vary within each volcanic center, suggesting that δ11B can be modifeid by 2-3‰ during differentiation in the crust. However, there are no consistent correlations in the data from individual islands with either indicatiors of differentiation (e.g. Rb/Sr and Ba/Sr) or indicators of fluid addition (e.g. B and B/Nb). This suggests that variations between islands are controlled by the involvement of multiple sources of fluids with distinct δ11B signatures.

Other Description: Cooper, G.F., Macpherson, C.G., Blundy, J D., Maunder, B., Allen, R.W., Goes, S., Collier, J., Bie, L., Harmon, N., Hicks, S. P., Iveson A. A., Prytulak J., Rietbrock A., Rychert C., Davidson J.P. and the VoiLA team, 2020, Variable water input controls evolution of the Lesser Antilles volcanic arc. Nature

摘要：本研究报道了采集自整条小安的列斯火山弧（Lesser Antilles arc）上11座岛屿的火山寄主熔体包裹体（volcanic hosted melt inclusions，以下简称MI）的原位δ11B（硼-11同位素比值）特征，以及其挥发分与微量元素浓度数据。该类MI的δ11B值介于-2.8‰至+11.2‰之间，覆盖了全球火山弧的大部分δ11B分布范围。弧中段（瓜德罗普、多米尼克与马提尼克诸岛）的MI δ11B值高于北弧与南弧段。单个火山中心内部的MI δ11B值也存在差异，这表明地壳分异过程可使δ11B发生2‰~3‰的偏移。然而，各岛屿的数据集与分异指标（如Rb/Sr与Ba/Sr比值）或流体加入指标（如硼含量与B/Nb比值）之间均未呈现出一致的相关性。这表明岛屿间的δ11B值差异受多种具有独特δ11B特征的流体源参与所调控。

其他说明：本数据集源自以下文献：Cooper, G.F.、Macpherson, C.G.、Blundy, J.D.、Maunder, B.、Allen, R.W.、Goes, S.、Collier, J.、Bie, L.、Harmon, N.、Hicks, S.P.、Iveson, A.A.、Prytulak, J.、Rietbrock, A.、Rychert, C.、Davidson, J.P. 以及VoiLA研究团队，2020年，《可变水输入调控小安的列斯火山弧演化》，《自然》（Nature）期刊。