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首页> 外文期刊>Contributions to Mineralogy and Petrology >Isotopic variations in S-type granites: an inheritance from a heterogeneous source?
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Isotopic variations in S-type granites: an inheritance from a heterogeneous source?

机译：S型花岗岩中的同位素变异：来自异质来源的继承？

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摘要

Inherited zircons from S-type granites provide exceptionally good insight into the isotopic heterogeneity of their sources. Zircons from four samples (one granite, two granodiorites, one granodioritic enclave) of Pan-African S-type granite of the Cape Granite Suite (c. 540 Ma) have been the subject of a laser LA-ICP-MS zircon U/Pb study to determine emplacement ages and inheritance. Zircons from three of these samples (2 granodiorites and 1 granodioritic enclave) were also analysed for Hf isotopes by LA-MC-ICP-MS. Ages of inherited cores range from 1,200 to 570 Ma and show Hafnium isotope values (?_(Hf,t)) for the crystallisation age (f) of the different cores that range from -14.1 to +9.1. Magmatic zircons and magmatic overgrowth with concordant spot ages between ca. 525 and ca. 555 Ma show a similar range of ?_(Hf,t) between -8.6 and +1.5, whilst ?_(Hf,t) values calculated at 540 Ma (?_(Hf,540)) for inherited cores range from - 15.2 to +1.7.
机译：从S型花岗岩中继承的锆石可以很好地了解其来源的同位素异质性。 Cape Granite Suite（约540 Ma）的泛非洲S型花岗岩的四个样品（一个花岗岩，两个花岗闪长岩，一个花岗闪长岩飞地）中的锆石已成为激光LA-ICP-MS锆石U / Pb的主题研究以确定安置年龄和继承权。还通过LA-MC-ICP-MS分析了这些样品中的三个（2个花岗闪长岩和1个花岗闪长岩飞地）的锆石中的Hf同位素。继承核的年龄范围为1,200至570 Ma，并且显示了从-14.1至+9.1范围内的不同核的结晶年龄（f）的Ha同位素值（Δ_（Hf，t））。岩浆锆石和岩浆过度生长，斑点年龄一致。 525和ca. 555 Ma显示介于-8.6和+1.5之间的相似的__（Hf，t）范围，而在540 Ma（？_（Hf，540））下计算的继承核的__（Hf，t）值范围为-15.2。至+1.7。

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