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首页> 外文期刊>South African Journal of Geology: Being the Transaction of the Geological Society of South African: Syndie die Verhandelinge van die Geologiese Vereniging van Suid-Afrika >Ion probe zircon dating of metasediments from the Areachap and Kakamas Terranes, Namaqua-Natal Province and the stratigraphic integrity of the Areachap Group
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Ion probe zircon dating of metasediments from the Areachap and Kakamas Terranes, Namaqua-Natal Province and the stratigraphic integrity of the Areachap Group

机译：纳马夸-纳塔尔省Areachap和Kakamas Terranes的离子探针锆石定年以及Areachap集团的地层完整性

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摘要

Ion probe U-Pb dating of different age domains within detrital zircons, distinguished using cathodoluminescent images, has been applied to three metasedimentary gneiss samples from the Jannelsepan, Copperton and Kenhardt Formations in the Areachap and Kakamas Terranes of the Namaqua-Natal Province. The Areachap Group samples yielded largely coherent ages which are considered to reflect the age of extrusion of the surrounding volcanic rocks. These are 1275 ± 7 Ma for the Jannelsepan Formation at Boksputs (with a component at ~1301 Ma) and 1282 ± 45 Ma for the Copperton Formation at Prieska Copper Mines. Direct dates of volcanic rocks in these formations in the literature are 1241 ± 12 Ma for the Jannelsepan Formation at Upington and 1285 ± 14 Ma for the Copperton Formation. The Kenhardt Formation sample contained three age domains. Concordant zircon cores dated at 1568 ± 23, 1351 ± 24 and 1296 ± 14 Ma reflect the presence of older crustal material in the Kakamas Terrane, whereas another six cores are coeval with the main, oscillatory zoned phase, dated at 1194 ± 7 Ma. This is the age of the magmatic rocks from which this metasedimentary sample was derived.
机译：利用阴极发光图像区分了碎屑锆石中不同年龄域的离子探针U-Pb年代，并已应用于纳马夸-纳塔尔省Areachap和Kakamas地形的Jannelsepan，Copperton和Kenhardt地层的三个沉积沉积的片麻岩样品。 Areachap组的样品产生了大致连贯的年龄，这被认为反映了周围火山岩挤出的年龄。 Boksputs的Jannelsepan组为1275±7 Ma（组分为〜1301 Ma），Prieska铜矿的Copperton组为1282±45 Ma。文献中这些地层中火山岩的直接年代为：Upington的Jannelsepan组为1241±12 Ma，而Copperton组为1285±14 Ma。 Kenhardt组样本包含三个年龄域。年代分别为1568±23、1351±24和1296±14 Ma的锆石核芯反映了Kakamas Terrane中较旧的地壳物质的存在，而另外六个岩心与主要的振荡带状相同时存在，年代为1194±7 Ma。这是该次沉积样品源自岩浆岩的年龄。

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