High‐Precision Trace Element Data for the USGS Reference Materials BCR‐1, BCR‐2, BHVO‐1, BHVO‐2, AGV‐1, AGV‐2, DTS‐1, DTS‐2, GSP‐1 and GSP‐2 by ID‐TIMS and MIC‐SSMS

Abstract

Different batches of the new US Geological Survey (USGS) reference materials (RMs) BCR‐2, BHVO‐2, AGV‐2, DTS‐2 and GSP‐2 and the original USGS RMs BCR‐1, BHVO‐1, AGV‐1, DTS‐1 and GSP‐1 have been analysed by isotope dilution using thermal ionisation mass spectrometry (ID‐TIMS) and by multi‐ion counting spark source mass spectrometry (MIC‐SSMS). The concentrations of K, Rb, Sr, Ba and the rare earth elements were determined with overall analytical uncertainties of better than 1% (ID‐TIMS) and 3% (MIC‐SSMS). The analyses of different aliquots and batches of BCR‐2, BHVO‐2, AGV‐2 and GSP‐2, respectively, agree within 1%, i.e. approximately the analytical uncertainties of the data. This indicates an homogeneous distribution of the trace elements in these RMs. Differences in element concentrations of up to 17% in different aliquots of the depleted RM DTS‐2 are outside the analytical uncertainty of our data. They may be attributed to a slightly heterogeneous distribution of trace elements in this dunite sample. Our trace element data for BCR‐2, BHVO‐2, AGV‐2 and GSP‐2 agree within about 3% with preliminary reference values published by the USGS. They also agree within 1‐6% with those of the original RMs BCR‐1, BHVO‐1, AGV‐1 and GSP‐1. Large compositional differences are found between DTS‐2 and DTS‐1, where the concentrations of K, Rb, Sr and the light REE differ by factors of 2 to 24.

Hf isotope compositions of northern Luzon arc lavas suggest involvement of pelagic sediments in their source

“…K-Ar ages and Nd isotopic data in italics are from Richard et al 1986aRichard et al , 1986bDefant et al 1990;McDermott et al 1993;Fourcade et al 1994 andMaury et al 1998. Eggins et al (1997) and are similar to other published values (Jenner et al, 1990, Raczek et al, 2001. Values measured for BIR-1 when samples were run are also given together with values (and 1σ) for the Bora Bora in-house standard run over a long period of time.…”

Discovery of lanthanide tetrad effect in an oceanic plagiogranite from an Ocean Core Complex at the Central Indian Ridge 25.DEG.S

“…Chondrite-normalized REE pattern of our BCR-2 data is quite smooth and coherent ( Fig. 3(a)), which agrees well with the recently published highprecision data obtained by ID-TIMS/MIC-SSMS (Raczek et al, 2001) and magnetic sector field ID-ICP-MS (Willbold and Jochum, 2005). This clearly indicates the high accuracy of our REE data.…”

Bimodal magmatism produced by progressively inhibited crustal assimilation

“…of 0.38 p.p.m. over mean values of 14 rare earth elements when compared with published values 53 . Values were chondrite normalized 54 before plotting.…”