TY - JOUR
T1 - Intergranular trace elements in mantle xenoliths from Russian Far East
T2 - Example for mantle metasomatism by hydrous melt
AU - Yamamoto, Junji
AU - Nakai, Shun'ichi
AU - Nishimura, Koshi
AU - Kaneoka, Ichiro
AU - Kagi, Hiroyuki
AU - Sato, Keiko
AU - Okumura, Tasuku
AU - Prikhod'ko, Vladimir S.
AU - Arai, Shoji
PY - 2009
Y1 - 2009
N2 - Based on both major and trace element chemistry, the occurrence of the intergranular component in mantle-derived xenoliths from far eastern Russia has been constrained. Whole-rock trace element measurements of one xenolith show apparent negative anomalies in Ce, Th, and high field strength elements on normalized trace element patterns. The trace element pattern of the whole rock differs from those of constituent minerals, indicating that the anomalies in the whole rock are attributable to the presence of an intergranular component. That assumption was confirmed using in situ analysis of trace elements in the intergranular substance and melt inclusion using laser ablation inductively coupled plasma-mass spectrometry. Both the intergranular component and the melt inclusions have identical trace element patterns, which mean that these materials are a cognate metasomatizing agent. The anomalies are regarded as mantle metasomatism related to an aqueous fluid. Hydrous minerals were observed on the wall of the melt inclusions using micro-Raman spectroscopy, indicating that the melt inclusions contained a large amount of water. Thus, this study reveals a trace element composition of a hydrous metasomatizing agent in the mantle.
AB - Based on both major and trace element chemistry, the occurrence of the intergranular component in mantle-derived xenoliths from far eastern Russia has been constrained. Whole-rock trace element measurements of one xenolith show apparent negative anomalies in Ce, Th, and high field strength elements on normalized trace element patterns. The trace element pattern of the whole rock differs from those of constituent minerals, indicating that the anomalies in the whole rock are attributable to the presence of an intergranular component. That assumption was confirmed using in situ analysis of trace elements in the intergranular substance and melt inclusion using laser ablation inductively coupled plasma-mass spectrometry. Both the intergranular component and the melt inclusions have identical trace element patterns, which mean that these materials are a cognate metasomatizing agent. The anomalies are regarded as mantle metasomatism related to an aqueous fluid. Hydrous minerals were observed on the wall of the melt inclusions using micro-Raman spectroscopy, indicating that the melt inclusions contained a large amount of water. Thus, this study reveals a trace element composition of a hydrous metasomatizing agent in the mantle.
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U2 - 10.1111/j.1440-1738.2008.00642.x
DO - 10.1111/j.1440-1738.2008.00642.x
M3 - Article
AN - SCOPUS:65449153966
VL - 18
SP - 225
EP - 241
JO - Island Arc
JF - Island Arc
SN - 1038-4871
IS - 1
ER -