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首页> 外文期刊>South African journal of geology >Single zircon age for the felsic Rubbervale Formation, Murchison Greenstone Belt, South Africa
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Single zircon age for the felsic Rubbervale Formation, Murchison Greenstone Belt, South Africa

机译：南非Murchison Greenstone带长英质Rubbervale组的单一锆石年龄

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摘要

Age data for the various greenstone belts of the northern Kaapvaal Craton are generally scarce and imprecise. Single zircons were dated, using the vapour digestion and evaporation techniques, from a felsic metavolcanic rock of the Rubbervale Formation which constitutes an almost 4 km-thick unit within the Murchison Greenstone Belt. Both methods yielded almost identical ~(207)Pb/~(206)Pb ages: 2965.2 ± 1.4 Ma and 2967.5 ± 1.3 Ma, respectively. The combined mean age of 2966.5 ± 1.6 Ma also provides a maximum age for the associated Rooiwater Complex, which is locally intrusive into the Rubbervale Formation. Due to a lack of isotopic data on the mafic portion of the Murchison Belt, its regional setting is speculative. Suggestions are that the belt and the adjacent gneissic terrains represent exotic crustal blocks, or that the Rooiwater Complex together with the Rubbervale Formation formed in an island arc setting.
机译：Kaapvaal Craton北部各种绿岩带的年龄数据通常稀少且不精确。利用蒸气消解和蒸发技术，从橡胶谷地层的长英质火山岩中标出了单个锆石，该岩石构成了默奇森绿岩带内近4公里厚的单元。两种方法都产生了几乎相同的〜（207）Pb /〜（206）Pb年龄：分别为2965.2±1.4 Ma和2967.5±1.3 Ma。平均年龄2966.5±1.6 Ma的总和还为相关的Rooiwater复合体提供了最大年龄，该区域局部侵入了Rubbervale地层。由于缺少默奇森带镁铁质部分的同位素数据，其区域设置具有推测性。建议是该带和相邻的片麻岩地形代表着奇特的地壳块，或者说，鲁伊沃特河群与橡胶谷地层一起形成了岛弧形环境。

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