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³⁷Cl systematics of a backarc spreading system: The Lau Basin

¹Department of Earth Sciences, IIC 1047, Memorial University, St. John's, Newfoundland A1B 3X5, Canada
²Department of Geology & Geophysics, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA
³Department of Geosciences, 104 Wilkinson Hall, Oregon State University, Corvallis, Oregon 97331, USA
⁴Department of Geosciences, University of Bremen, Klagenfurter Strasse 2, 28359 Bremen, Germany

Correspondence: *E-mails: gdlayne{at}mun.ca; adam.kent{at}geo.oregonstate.edu; wbach{at}uni-bremen.de.

Determinations of ³⁷Cl in glasses and melt inclusions from backarc basin basalts of the Lau Basin (southern Pacific Ocean) constrain the effects of mantle source, subduction, and shallow assimilation. In sections of the Lau Basin not heavily affected by subduction input (central and eastern Lau spreading centers), Cl derived from unfractionated seawater via assimilation in shallow crustal environments is the predominant source of "excess Cl," and moderates ³⁷Cl to near zero values. In contrast, low-Cl glasses from the Mangatolu triple junction have distinctly negative ³⁷Cl, compatible with recent estimates for ³⁷Cl of the depleted mantle source. Along the Valu Fa Ridge, subduction input manifests as ³⁷Cl that is variable but dispersed toward more negative values in both lavas and melt inclusions. These values are compatible with a second source of lighter Cl within a slab-derived flux derived from altered ocean crust, sediments, and/or serpentinized mantle wedge.