Table T1 lists in detail the samples taken during Leg 176 and studied using various methods at The University of Queensland. For all but one sample, two polished thin sections each were made for detailed petrography. A total of 100 samples were analyzed for whole-rock major and trace elements. Of these, 79 samples were analyzed for mineral major element compositions and 48 samples were analyzed for trace elements on mineral separates. Fifteen felsic vein samples were analyzed for Sr and O isotopes on primary and secondary plagioclase.
Sample identification abbreviations in Table T1 specify the purpose of a particular aspect of the study. Samples with prefix BN were fresh (F) and altered (A) sample pairs taken in spatial proximity in the same core section to study the chemical consequences of low-temperature alteration in lower ocean crust. The work is presented elsewhere by Bach et al. (2001). Samples with prefix FV are felsic veins/veinlets taken to study the mineralogy, geochemistry, and petrogenesis of felsic vein lithologies. This work will be presented separately (J.H. Natland et al., unpubl. data). Samples with prefix MS are taken to characterize trace element systematics of the whole-rock gabbroic samples and the constituent minerals. This work will also be presented separately (Y. Niu et al., unpubl. data). Samples with prefix GS are olivine gabbros with microgabbroic "veins/veinlets" taken to study the nature and origin of the microgabbros. As their mineral compositions are essentially the same as those of the coarse-grained host (see Tables T2, T3, T4, T5), no further analytical work is necessary.