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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 >The Sr isotopic stratigraphy of the far northern Bushveld Complex
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The Sr isotopic stratigraphy of the far northern Bushveld Complex

机译：BUSHVELD复合体的SR同位素地层

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摘要

We present the first in-situ Sr isotopic and mineral geochemical results for plagioclase in mafic to ultramafic rocks of the Waterberg Project of the far northern Bushveld Complex. Initial strontium isotopic compositions of plagioclase are dominantly in the range of ~(87)Sr/ ~(86)Sr_i (Sr_i) 0.7065 to 0.7075, differing from the rest of the Northern Lobe, which has higher values with an average Sr_i values of 0.708. Based on mineralogy and geochemistry, the intrusion was previously interpreted to consist of two main pulses. However, the Sr isotopic data exhibit relatively little stratigraphic variation over a wide range of rock types. The results of this study, therefore, represent a paradox: Compositionally clearly different magmas have nearly identical initial Sr ratios, whereas the compositionally somewhat similar magmas of the Northern Lobe display statistically significantly different initial Sr ratios. We suggest, therefore, that the observed Sr values represent a proxy for the residence time and concomitant country rock assimilation of magma in the lower crust and in the case of theWaterberg Project, indicate one common staging chamber for all magmas. Furthermore, the data presented here, together with recently published studies support a disconnect between rocks north and south of the Hout River Shear Zone, and indicate two separate, mineralized, magmatic basins.
机译：我们向远北北部北部岩浆项目的MAFIC中的Plagioclase提供第一个原位Sr同位素和矿物地球化学结果。 Plagioclase的初始锶同位素组合物在〜（87）Sr /〜（86）SR_I（SR_I）的范围内，0.7065至0.7075，与北角叶的其余部分不同，具有较高的值，平均SR_i值为0.708 。基于矿物学和地球化学的基础，侵入以前被解释为包括两个主要脉冲。然而，Sr同位素数据在各种岩石类型上表现出相对较少的地层变化。因此，该研究的结果代表了一种悖论：组成明显不同的岩浆具有几乎相同的初始SR比，而北角叶片的组成有些类似的岩浆显示出统计学上显着的初始SR比率。因此，我们建议观察到的SR值代表了岩土地壳中岩浆中的停留时间和伴随国家岩石同化的代理，并且在水中项目的情况下，表明所有岩浆的一个常见的分期室。此外，这里呈现的数据与最近公布的研究一起支撑了岩石剪力区的岩石南部和南部之间的断开，并表示两个独立的，矿化的岩浆盆地。

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