Sr and Nd isotopic compositions of apatite reference materials used in U-Th-Pb geochronology

Sr and Nd isotopic compositions of apatite reference materials used in U-Th-Pb geochronology
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U-Th-Pb 地质年代学中使用的磷灰石参考材料的 Sr 和 Nd 同位素组成

DOI:
10.1016/j.chemgeo.2014.07.012
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发表时间:
2014-10
期刊:
影响因子:
3.9
通讯作者:
Huang C
Huang C
中科院分区:
地球科学2区
文献类型:
--
作者:
Xie LW;Chu ZY;Zhang YB;Huang C

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磷灰石是火成岩、变质岩和碎屑沉积岩中常见的重要含U、Th副矿物。采用 SIMS 和 LA-(MC)-ICP-MS 方法进行原位 U-Th-Pb 磷灰石地质年代学的出现证明了拥有均匀一致的参考材料的重要性。最近,研究表明,Sr 和 Nd 同位素数据与 U-Pb 年龄和微量元素浓度数据相结合,可以对磷灰石共生提供重要的约束,因为该相通常表现出较高的 Sr 和 REE 浓度,但 Rb/Sr 比率较低,导致对放射性 Sr 向内生长的校正可以忽略不计。然而,由于磷灰石可能具有由多种热事件(例如继承核心和变质过度生长)导致的复杂内部结构,因此需要Sr和Nd同位素数据应以高空间分辨率测量。然而,同量异位素干扰妨碍了 LA-MC-ICP-MS 分析中 Sr 或 Nd 同位素组成的精确测定。在这项工作中,我们对 U-Th-Pb 地质年代学中常用的 11 种磷灰石参考材料(AP1、AP2、Durango、MAD、Otter Lake、NW-1、Slyudyanka、UWA-1、Mud Tank、McClure Mountain 和 SDG)进行了 Sr 和 Nd 同位素组成的原位测量。我们获得的这些磷灰石样品的 Sr 和 Sm-Nd 同位素组成与使用 MC-ICP-MS 或 TIMS 的基于溶液的方法(同位素稀释和离子色谱)获得的值一致,这证明了我们的分析方案的可靠性和稳健性。
Apatite is an important common U- and Th-bearing accessory mineral in igneous, metamorphic and clastic sedimentary rocks. The advent ofin situU–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 undertookin situmeasurements 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.
DOI: 10.1016/j.sab.2014.05.006
发表时间: 2014-07
期刊: Spectrochimica Acta Part B: Atomic Spectroscopy
影响因子: --
作者:
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