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首页> 外文期刊>Geology >Plutonic boninite-like rocks in an anatectic setting: Tectonic implications for the Delamerian orogen in southeastern Australia
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Plutonic boninite-like rocks in an anatectic setting: Tectonic implications for the Delamerian orogen in southeastern Australia

机译：处于深水环境的深成岩类次大陆质岩石：对澳大利亚东南部德拉美造山带的构造意义

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摘要

High-Mg, low-Ti diorites in the Cambrian-Ordovician Glenelg River Complex (southeastern Australia) have compositional affinities with the boninitic lavas erupted in intra-oceanic arcs, but occur in an anatectic environment mingled with crustal melts. Boninitic rocks have not previously been recorded from such a setting. Field and petrologic evidence suggests that the parental boninitic liquids are approximated by hornblende diorites, crystallization from which yielded complementary cumulates and evolved tonalitic derivatives. The presence of these rocks, and associated arc-like intrusions, compromises collisional tectonic models for the Gleneig River Complex and instead implies early development of the terrane above a subduction zone. Boninitic magmas were subsequently trapped at deep crustal levels during convergent orogenesis. [References: 29]
机译：寒武纪-奥陶纪格列内尔格河综合体（澳大利亚东南部）中的高镁，低钛闪长岩具有成分亲和性，其中洋弧内喷出的贝尼特质熔岩，但发生在地壳融化混合的南极环境中。以前没有从这样的环境中记录过波尼尼奇岩石。野外和岩石学证据表明，亲本邦尼体液体近似于角闪闪长闪闪的闪长岩，从中结晶可产生互补堆积物并生成tonalitic衍生物。这些岩石的存在以及相关的弧状侵入物损害了格莱尼格河综合体的碰撞构造模型，反而暗示了俯冲带上方地层的早期发育。随后，在造山运动收敛的过程中，邦尼系岩浆被困在地壳深处。 [参考：29]

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