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 chemistry of Karoo-age andesitic lavas along the northern Mozambique coast, southern Africa and possible implications for Gondwana breakup.
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The chemistry of Karoo-age andesitic lavas along the northern Mozambique coast, southern Africa and possible implications for Gondwana breakup.

机译:莫桑比克海岸北部喀鲁时代山羊座的化学山脉,南部非洲和对Gondwana分手的可能影响。

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摘要

Major, trace, radiogenic isotope and stable isotope data from lavas along the northeastern coast of Mozambique are described. The whole rock composition data demonstrate that the rocks are dominantly andesitic with compositions typical of calc-alkaline volcanic rocks from arc environments. SHRIMP U/Pb data from zircons indicate that the zircons are xenocrystic, having ages of between 500 Ma and 660 Ma, with the age of the lava constrained by Rb/Sr data at ~184 Ma. Strontium, Nd and Pb radiogenic isotope data support an interpretation of extensive mixing between a Karoo age basaltic magma (dolerite) from Antarctica and continental crust similar in composition to the Mozambique basement. Oxygen isotope data also imply a significant crustal contribution to the lavas. Possible tectonic settings for the lavas are at the margin of a plume or from a locally restricted compressional setting during Gondwana breakup processes.
机译:描述了来自莫桑比克东北海岸熔岩的主要,痕量,辐射同位素和稳定同位素数据。 整个岩石构成数据表明,岩石是典型的克碱性火山岩石中弧环境的典型组合物。 来自锆石的虾U / Pb数据表明锆石是XenoCrystic,其年龄在500 mA和660 mA之间,熔岩的年龄受到〜184 mA的RB / SR数据的约束。 锶,Nd和Pb辐射性同位素数据支持从南极和大陆地壳与莫桑比克地下室相似的南极和大陆地壳之间广泛混合的解释。 氧同位素数据也意味着对熔岩的显着地壳贡献。 熔岩的可能构造设置在Gondwana分手过程中的羽流边缘或来自局部限制的压缩设置。

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