U–Pb zircon geochronology in the western part of the Rayner Complex, East Antarctica
U–Pb zircon geochronology in the western part of the Rayner Complex, East Antarctica
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DOI：
10.2465/jmps.150811
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发表时间：
2016
影响因子：
0.7
通讯作者：
K. Horie;T. Hokada;Y. Motoyoshi;K. Shiraishi;Y. Hiroi;Mami Takehara
中科院分区：
文献类型：
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作者：
K. Horie;T. Hokada;Y. Motoyoshi;K. Shiraishi;Y. Hiroi;Mami Takehara
- 本文对采自天山的9个变质沉积岩样品进行了Pb锆石年代学研究。Yuzhnaya，Condon Hills和Mt。里拉在内陆地区的雷纳杂岩西部恩德比地，东南极洲，以确定东部界限的雷纳杂岩经历泛非变质作用，并评估潜在的源区的变质沉积岩。康登山和Mt.里拉揭示的变质年龄分别为~ 894和~ 934 Ma，这与以前报道的与雷纳构造幕（RSE）有关的变质作用相一致。山受RSE影响的Yuzhnaya样品中含有590 - 570 Ma期间再生的锆石颗粒，这表明泛非改造可以延伸到Mt.尤兹娜娅另一方面，康登山样品包括太古代碎屑，年龄峰值在3850 - 2491 Ma之间，是西部恩德比地Rayner杂岩中最古老的组分。在所研究的Rayner样品中，没有证据表明改造过的纳皮耶杂岩。
– Pb zircon geochronology was applied to nine metasedimentary samples collected from Mt. Yuzhnaya, Condon Hills, and Mt. Lira in the inland region of the Rayner Complex of western Enderby Land, East Antarctica, in order to de fi ne the eastern limits of the western Rayner Complex that underwent the Pan – African metamorphism and to evaluate potential source areas of metasedimentary rocks. Condon Hills and Mt. Lira revealed metamorphic ages of ~ 894 and ~ 934 Ma, respectively, which are consistent with previously reported metamorphism in association with Rayner Structural Episode (RSE). Mt. Yuzhnaya samples affected by the RSE contain zircon grains rejuvenated during 590 – 570 Ma, which indicates that the Pan – African reworking can be extended up to Mt. Yuzhnaya. On the other hand, the Condon Hills samples include Archean detritus, and the age peaks from 3850 to 2491 Ma are the oldest components in the Rayner Complex of western Enderby Land. There is no evidence of reworked Napier Complex rocks in the studied Rayner samples.