Sr-Nd Isotope Systematics of Xenoliths in Cenozoic Volcanic Rocks from SW Japan
Sr-Nd Isotope Systematics of Xenoliths in Cenozoic Volcanic Rocks from SW Japan
复制标题
日本西南新生代火山岩中捕虏体的 Sr-Nd 同位素系统学
DOI：
10.2183/pjab.69.1
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
T. Nureki
中科院分区：
文献类型：
--
作者：
H. Kagami;S. Iizumi;Masatoshi Iwata;T. Nureki
根据新的和以前发表的Sr和Nd同位素数据，我们研究了深地壳和上地幔来源的捕虏体在新生代火山岩和白垩纪-古近纪花岗岩类岩石在日本西南部之间的岩石成因关系。日本西南部新生代火山岩中的深地壳和上地幔来源的镁铁质-超镁铁质捕虏体具有与其各自地区的古近纪花岗岩类岩石相当的初始Sr和Nd同位素比值。这可能表明，这些捕虏体在遗传上与日本西南部的古近纪花岗岩类岩石有关，而在花岗岩类岩石中观察到的Sr和Nd同位素比值的区域变化归因于岩浆来源的地球化学差异。
Based on new and previously published Sr and Nd isotope data, we examined the petrogenetic relationship between deep crust- and upper mantle-derived xenoliths contained in Cenozoic volcanic rocks and Cretaceous-Paleogene granitoid rocks in SW Japan. The deep crust- and upper mantle-derived mafic to ultramafic xenoliths contained in Cenozoic volcanic rocks from SW Japan have comparable initial Sr and Nd isotope ratios to the Cretaceous-Paleogene granitoid rocks in their respective districts. This may suggest that these xenoliths were genetically related to the Cretaceous-Paleogene granitoid rocks in SW Japan, and that regional variations in Sr and Nd isotope ratios observed in the granitoid rocks are attributed to differences in the geochemistry of the magma sources.