TY - JOUR
T1 - Sr and Nd isotopic compositions of apatite reference materials used in U-Th-Pb geochronology
AU - Yang, Yue-Heng
AU - Wu, Fu-Yuan
AU - Yang, Jin-Hui
AU - Chew, David M.
AU - Xie, Lie-Wen
AU - Chu, Zhu-Yin
AU - Zhang, Yan-Bin
AU - Huang, Chao
PY - 2014/10/14
Y1 - 2014/10/14
N2 - Apatite is an important common U- and Th-bearing accessory mineral in igneous, metamorphic and clastic sedimentary rocks. The advent of in situ U-Th-Pb apatite geochronology by the SIMS and LA-(MC)-ICP-MS methods has demonstrated the importance of having uniform and homogeneous reference materials. Recently, it has been shown that Sr and Nd isotopic data combined with U-Pb age and trace element concentration data can provide important constraints on apatite paragenesis because this phase usually exhibits high Sr and REE concentrations but has low Rb/Sr ratios which result in negligible corrections for the ingrowth of radiogenic Sr. However, as apatite can potentially have complex internal structures resulting from multiple thermal events, such as inherited cores and metamorphic overgrowths, requires that the Sr and Nd isotopic data should be measured with high spatial resolution. However isobaric interferences hamper the precise determination of Sr or Nd isotopic compositions in LA-MC-ICP-MS analysis. In this work we undertook in situ measurements of Sr and Nd isotopic compositions of eleven apatite reference materials (AP1, AP2, Durango, MAD, Otter Lake, NW-1, Slyudyanka, UWA-1, Mud Tank, McClure Mountain and SDG) commonly used in U-Th-Pb geochronology. Our obtained Sr and Sm-Nd isotopic compositions for these apatite samples are consistent with those values obtained by solution-based methods (isotope dilution and ion chromatography) using MC-ICP-MS or TIMS, which demonstrates the reliability and robustness of our analytical protocol.
AB - Apatite is an important common U- and Th-bearing accessory mineral in igneous, metamorphic and clastic sedimentary rocks. The advent of in situ U-Th-Pb apatite geochronology by the SIMS and LA-(MC)-ICP-MS methods has demonstrated the importance of having uniform and homogeneous reference materials. Recently, it has been shown that Sr and Nd isotopic data combined with U-Pb age and trace element concentration data can provide important constraints on apatite paragenesis because this phase usually exhibits high Sr and REE concentrations but has low Rb/Sr ratios which result in negligible corrections for the ingrowth of radiogenic Sr. However, as apatite can potentially have complex internal structures resulting from multiple thermal events, such as inherited cores and metamorphic overgrowths, requires that the Sr and Nd isotopic data should be measured with high spatial resolution. However isobaric interferences hamper the precise determination of Sr or Nd isotopic compositions in LA-MC-ICP-MS analysis. In this work we undertook in situ measurements of Sr and Nd isotopic compositions of eleven apatite reference materials (AP1, AP2, Durango, MAD, Otter Lake, NW-1, Slyudyanka, UWA-1, Mud Tank, McClure Mountain and SDG) commonly used in U-Th-Pb geochronology. Our obtained Sr and Sm-Nd isotopic compositions for these apatite samples are consistent with those values obtained by solution-based methods (isotope dilution and ion chromatography) using MC-ICP-MS or TIMS, which demonstrates the reliability and robustness of our analytical protocol.
KW - apatite
KW - Sr isotopes
KW - Sm-Nd isotopes
KW - LA-MC-ICP-MS
KW - U-Th-Pb geochronology
UR - http://www.scopus.com/inward/record.url?scp=84905514745&partnerID=8YFLogxK
U2 - 10.1016/j.chemgeo.2014.07.012
DO - 10.1016/j.chemgeo.2014.07.012
M3 - Article
AN - SCOPUS:84905514745
SN - 0009-2541
VL - 385
SP - 35
EP - 55
JO - Chemical Geology
JF - Chemical Geology
ER -