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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 >Detrital zircon in sandstones from the Palaeoproterozoic Waterberg and Nylstroom basins, South Africa: Provenance and recycling
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Detrital zircon in sandstones from the Palaeoproterozoic Waterberg and Nylstroom basins, South Africa: Provenance and recycling

机译：在古典古代山羊和南非尼龙盆地的砂岩的碎屑锆石：出处和回收

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摘要

Laser-ablation ICPMS U-Pb and Lu-Hf isotope data on detrital zircon in sandstone from the Palaeoproterozoic Waterberg Group in the Waterberg and Nylstroom basins of northeastern South Africa contain a dominant Palaeoproterozoic (2 000 to 2 150 Ma) age fraction and minor, late Archaean zircon (2 650 to 2 780 Ma). Zircon in the 2 200 to 2 350 Ma age range is very scarce. There are no statistically significant differences in detrital zircon age distributions of sandstones in the two basins. In contrast, conglomerate from the northern margin of the Waterberg basin (Mogalakwena Formation) is dominated by a late Archaean age fraction (2 600 to 2 700 Ma, with minor 3 200 to 3 300 Ma), which resides in quartzite clasts. Zircon ages alone cannot distinguish between potential sources of detritus in the Kaapvaal Craton and Limpopo Belt. Hf isotope data, however, suggest that the main input to the basins was from recycled Archaean to Palaeoproterozoic sedimentary cover successions on the Kaapvaal Craton, supplemented by material from late Archaean granitic intrusions and the felsic igneous rocks of the Rooiberg Group and / or felsic members of the Bushveld Complex. The only known source of a prominent group of ca. 2.0 Ga detrital zircon with epsilon-Hf = 0 to-3 would be the youngest generation of granites in the Limpopo Belt (e.g. Mahalapye Granite). The Waterberg Group or its equivalents have provided only minor amounts of detritus to the Neoproterozoic to Cambrian basins at the western margin of the Kalahari Craton, directly or through recycling of intermediate deposits. However, erosion of the rocks in the Waterberg and Nylstroom basins provided material to the lower stratigraphic levels of the adjacent, Karoo-age Ellisras and Springbok Flats basins.
机译：激光烧蚀ICPMS U-PB和LU-HF同位素数据上砂岩中的碎屑锆石山群古代古代古代古代古古代山脉和东北非洲尼龙盆地含有占主导地位的古典古代（2 000至2 150 mA）年龄分数和次要，迟到的考古锆石（2 650到2 780 ma）。锆石在2 200到2 350 mA年龄范围内非常稀缺。两种盆地中砂岩的碎屑锆石年龄分布没有统计学意义。相比之下，从水钻盆地的北边缘（Mogalakwena Mablation）的北极缘为主，由晚古代年龄分数（2 600至2 700 mA，含有次要3 200至3 300 mA），其存在于石英岩泥浆中。锆石的年龄不能区分Kaapvaal Craton和Limpopo皮带的滴滴涕。然而，HF同位素数据表明，盆地的主要输入来自回收的古代古代沉积覆盖在Kaapvaal Craton上的古代古代沉积覆盖，补充了来自植物丛生群和/或猫科学成员的岩石群侵入和肠道火岩布什维尔德的综合体。唯一已知的一个突出的CA源头。 2.0 GA碎屑锆石与epsilon-hf = 0到-3将是林蛙带中最小的花岗岩（例如mahalapye花岗岩）。水钻组或其等同物仅为Kalahari Craton的西部边缘或通过中间沉积物的再循环而仅为Kalahari Craton的西部边缘提供了少量的碎屑。然而，岩石和邻龙雨盆地的岩石的侵蚀为相邻，卡罗·时代Ellisras和Springbok公寓盆地的较低地层水平提供了材料。

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