

FOLLOWUS
1. Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences
2. Graduate School of Chinese Academy of Sciences
3. Geological Brigade of Hydrogeology and Engineering Geology Zhejiang Geological Prospecting Bureau
Online First:04 December 2009,
Published:2009
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Wang, X., Zeng, Z., Liu, C. et al. Trace element composition of peridotites from the southern Mariana forearc: Insights into the geochemical effects of serpentinization and/or seafloor weathering., Chin. J. Ocean. Limnol. 27, 985–992 (2009). https://doi.org/10.1007/s00343-009-9252-6
Peridotites from the southern Mariana forearc were sampled on the landward trench slope of the Izu-Bonin-Mariana (IBM) subduction zone by dredging. These mantle wedge peridotites underwent hydration by fluid derived from a dehydrated descending slab
and later interacted with seawater after emplacement at or near the seafloor. This study investigates how these two different rock-fluid interaction processes influenced trace element distribution in the southern Mariana forearc peridotites. We measured trace element concentrations of peridotites from the southern Mariana forearc. The southern Mariana forearc peridotites are characterized by a distinct seawater-like REE pattern with an obvious negative Ce anomaly
and La shows good correlation with other REEs (except Ce). In addition
there is a great enrichment of U
Pb
Sr and Li elements
which show a distinct positive anomaly relative to adjacent elements in the multi-element diagram. For the seawater-like REE pattern
we infer that REEs are mainly influenced by seawater during peridotite-seawater interactions after their emplacement at or near the seafloor
by serpentinization or by marine weathering. Furthermore
the anomalous behavior of Ce
compared with other rare earth elements in these samples
may indicate that they have undergone reactions involving Ce (IV) when the peridotites interacted with seawater. Positive U
Pb
Sr and Li anomalies are inferred to be related to seawater and/or fluids released during dehydration of the subducting slab.
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