Geochemical and chronological constraints on interactions between the Yap arc and the Caroline plateau: Datasets and Supplementary Materials
The supporting information for this paper includes text and tables. The text file is a description of detailed analyses methods (Text S1) . Tables give completed data for geochemistry and geochronology results of Yap Arc basement rock samples, which includes: Table S1 (Mineral assemblages of the selective samples), Table S2 (SIMS U–Th–Pb analytical results of titanites in Yap amphibolites), Table S3 (major and trace elements data and Sr-Nd-Pb-Hf isotopes data), Table S4 (40Ar/39Ar VG3600 furnace step-heating analytical results for Y3-9-5 amphiboles) and Table S5(ARGUSVI 40Ar/39Ar laser step-heating analytical results for Y30059-1 amphiboles), which are uploaded separately.
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The rock samples were cleaned with distilled water and crushed into small particles of <3 mm in diameter. The grains with visibly altered parts or secondary minerals were picked out carefully under a binocular. Only the fresh grains with no visible weathered surfaces or secondary minerals were pulverized into powders of 200 mesh with an agate mortar. Whole-rock major element compositions of the samples were analyzed on fused glass discs with a Thermo ARL 9900 X-ray fluorescence spectrometer (XRF) at the State Key Laboratory for Mineral Deposits Research, Nanjing University. Whole-rock trace element compositions in this study were analyzed by ICP-MS (Thermo X-Series II) at the Institute of Crustal Dynamics, China Earthquake Administration. To eliminate the effects of seafloor weathering, the sample powders for Sr-Nd-Pb-Hf isotope analyses were leached in 6N HCl at 70 °C for 30 mins before digestion. Sr-Nd-Pb-Hf isotopes were analyzed fully automatically by multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) using a Nu Plasma system at the University of Queensland. The U-Th-Pb age-dating analyses on titanites were performed using a Cameca IMS-1280HR SIMS at Institute of Geology and Geophysics, Chinese Academy of Sciences. 40Ar/39Ar dating of amphiboles was conducted in the Noble Gas laboratory at the University of Melbourne.