Continental subduction-triggered carbonate metasomatism of the lithospheric mantle: Implications for the deep carbon cycle

Table 1. Mineral assemblage of the Qixia xenoliths in this study.Table 2. In situ Sr isotopic compositions of clinopyroxene in Qixia xenoliths measured by LA-MC-ICP-MS.Table S1-S5 lists the major (wt%) and trace (µg/g) element compositions in USGS reference glasses and minerals (including olivine, clinopyroxene, orthopyroxene, and spinel) from Qixia mantle xenoliths in this study. The major and trace elements of minerals were analyzed <i>in situ</i> by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) with a spot size of 44 μm at the State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan (GPMR-CUG). Detailed operating conditions for LA-ICP-MS are described in Liu et al. (2008b). Off-line selection and integration of background and analytical signals, time-drift correction, and quantitative calibration were conducted using the ICPMSDataCal software (Liu et al., 2008b, 2010). Table S6 shows the equilibration temperatures of mantle xenoliths in this study calculated from selected different thermometers. <br>

表1 本研究中栖霞捕虏体的矿物组合。表2 本研究中采用激光剥蚀多接收等离子体质谱（LA-MC-ICP-MS）测定的栖霞捕虏体中单斜辉石的原位Sr同位素组成。表S1至S5列出了本研究中美国地质调查局（USGS）标准玻璃及栖霞幔源捕虏体中矿物（包括橄榄石、单斜辉石、斜方辉石及尖晶石）的主量（质量分数，wt%）和微量元素（质量分数，µg/g）组成。本研究中矿物的主量与微量元素采用激光剥蚀电感耦合等离子体质谱（LA-ICP-MS）进行原位分析，分析束斑直径为44 μm，测试工作在中国地质大学（武汉）地质过程与矿产资源国家重点实验室（GPMR-CUG）完成。LA-ICP-MS的详细操作参数参见Liu等（2008b）的研究。本研究采用ICPMSDataCal软件完成背景与分析信号的离线选择、积分，以及时间漂移校正与定量校准（Liu等，2008b、2010）。表S6列出了本研究中通过选取不同温压计计算得到的幔源捕虏体平衡温度。