INTRODUCTIONChemical data have been contributed to this volume by several laboratories. To facilitate comparison of the data, four standards of rocks we recovered on Leg 45 were powdered on board ship, and splits distributed to members of the shipboard party. The standards are (1) Sample 395-17-1, 56-69 cm, a gabbro; (2) Sample 395-18-1, 61-70 cm, a serpentinized peridotite; (3) Sample 395A-15-5, 0-11 cm, a Plagioclase olivine phyric basalt of chemical Unit P 2 ; and (4) Sample 395A-63-1, 108-116 cm, a dolerite of chemical Unit P 4 '. Of the samples, the gabbro, the phyric basalt, and the dolerite are fresh. The serpentinized peridotite is relatively fresh, as sea-floor peridotites go, but overall is considerably more altered than the other samples.In this chapter, we summarize the analytical procedures of the five laboratories contributing most of the data to this volume, present the interlaboratory comparisons, and then tabulate all major-oxide and traceelement data for each hole in stratigraphic order. Natural glass probe data submitted by W. G. Melson are not strictly equivalent to whole-rock data, and are listed in a separate table. ANALYTICAL PROCEDURESThe five groups whose procedures we summarize are (1) Centre Océanologique de Bretagne, Brest, France (COB, Bougault et al., this volume); (2) the NASA-Johnson Space Center, Houston, Texas (JSC, Rhodes et al., this volume); (3) British Museum of Natural History, London, United Kingdom (BM, Graham et al., this volume); (4) the chemical analytical laboratory of the Geological Institute of the USSR Academy of Sciences (Gl, Zolotarev and Choponov, this volume); and (5) the Mineralogisch-Petrographisches Institut der
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