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首页> 外文期刊>Contributions to Mineralogy and Petrology >Geochemistry of intermediate to siliceous volcanic rocks of the Rooiberg Group, Bushveld Magmatic Province, South Africa
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Geochemistry of intermediate to siliceous volcanic rocks of the Rooiberg Group, Bushveld Magmatic Province, South Africa

机译：南非布什维尔德岩浆省Rooiberg组中至硅质火山岩的地球化学

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摘要

The volcanic Rooiberg Group represents the earliest phase of Bushveld-related magmatism and comprises, in some areas, the floor and roof rocks of the mafic–ultramafic intrusive units of the Bushveld Complex. The lower to middle Dullstroom Formation is composed of two interbedded series of low Ti and high Ti volcanic strata, which are predominantly basaltic andesites. Volcanic units above these strata range from andesites to dacites in the upper Dullstroom Formation and to predominantly rhyolites in the overlying Damwal and Kwaggasnek Formations. Compositional data suggest that these intermediate to siliceous volcanic rocks are petrogenetically related to the low Ti volcanic suite and suggest that the low Ti magmas resided in a shallow magma chamber where they experienced fractional crystallization and assimilation of crustal material. In contrast, the high Ti volcanic suite is petrogenetically unrelated. These data confirm previous suggestions that Bushveld-related magmas experienced significant amounts of assimilation of continental crust.
机译：鲁伊贝格火山群是布什维尔德相关岩浆作用的最早阶段，在某些地区包括布什维尔德综合体的镁铁质-超镁铁质侵入单元的底岩和顶岩。下至中层的Dullstroom组由低钛和高Ti火山岩地层的两个相互交错的系列组成，主要是玄武质安山岩。这些地层以上的火山单元范围从安山岩到上层达斯特鲁斯特组的达西斯山脉，再到上覆的Damwal组和Kwaggasnek组的流纹岩。成分数据表明，这些硅质火山岩的中层与低钛火山岩成岩作用有关，表明低钛岩浆位于浅岩浆室内，在那里经历了部分结晶和地壳物质同化作用。相比之下，高钛火山岩组合在成因上无关。这些数据证实了先前的建议，即与布什维尔德相关的岩浆经历了大量的大陆壳同化作用。

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    《Contributions to Mineralogy and Petrology》 |2002年第2期|131-143|共13页
  • 作者

    P. Buchanan; W. Reimold; C. Koeberl; F. Kruger;

  • 作者单位

    Impact Cratering Research Group School of Geosciences University of the Witwatersrand Private Bag 3 WITS 2050 Johannesburg South Africa;

    Impact Cratering Research Group School of Geosciences University of the Witwatersrand Private Bag 3 WITS 2050 Johannesburg South Africa;

    Institute of Geochemistry University of Vienna Althanstrasse 14 1090 Vienna Austria;

    Economic Geology Research Institute-Hugh Allsopp Laboratory School of Geosciences University of the Witwatersrand Johannesburg South Africa;

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