Igneous geochemistry of OP Leg 126 samples, supplement to: Taylor, Rex T; Lapierre, Henriette; Vidal, Philipp; Nesbitt, Robert W; Croudace, Ian W (1992): Igneous geochemistry and petrogenesis of the Izu-Bonin forearc basin. In: Taylor, B; Fujioka, K.; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 126, 405-430


Major element, trace element, and radiogenic isotope compositions of samples collected from Ocean Drilling Program Leg 126 in the Izu-Bonin forearc basin are presented. Lavas from the center of the basin (Site 793) are high-MgO, low-Ti, two-pyroxene basaltic andesites, and represent the products of synrift volcanism in the forearc region. These synrift lavas share many of the geochemical and petrographic characteristics of boninites. In terms of their element abundances, ratios, and isotope systematics they are intermediate between low-Ti arc tholeiites from the active arc and boninites of the outer-arc high. These features suggest a systematic geochemical gradation between volcanics related to trench distance and a variably depleted source. A basement high drilled on the western flank of the basin (Site 792) comprises a series of plagioclase-rich two-pyroxene andesites with calc-alkaline affinities. These lavas are similar to calc-alkaline volcanics from Japan, but have lower contents of Ti, Zr, and low-field-strength elements (LFSE).

DOI http://dx.doi.org/doi:10.1594/PANGAEA.713805
Metadata Access http://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite3&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.713805
Creator Lapierre, Henriette;Nesbitt, Robert W;Taylor, Rex T;Vidal, Philipp;Croudace, Ian W
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 1992
Rights Creative Commons Attribution 3.0 Unported (CC-BY)
Language English
Resource Type Supplementary Collection of Datasets
Format application/zip
Discipline Earth System Research
Spatial Coverage (31N-32N,140E-141E)
Temporal Point 1989-05-19T11:59:59Z