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首页> 外文期刊>Australian Journal of Earth Sciences >Looking beneath the Stawell and Bendigo zones in Victoria, Australia: a view through the granite window
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Looking beneath the Stawell and Bendigo zones in Victoria, Australia: a view through the granite window

机译：看着澳大利亚维多利亚维多利亚的Stawell和Bendigo区下面：通过花岗岩窗口的视图

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摘要

Information, mainly from the granitic and silicic volcanic rocks in the Stawell, Bendigo and Melbourne structural zones in the state of Victoria, shows that the sources of both the S- and I-type rocks of the Stawell and Bendigo zones (SBZ) contrast in ages and chemistry with the sources of similar granitic rocks in the Melbourne Zone, consistent with the absence of the mainly Proterozoic Selwyn Block beneath most of the SBZ. Below a mid-crustal decollement in the SBZ, the crust is evidently highly variable and possibly includes thinned Proterozoic crust. There is geochronological evidence for ca 400 and ca 370 Ma granulite-grade metamorphic events here, and, after this double bout of metamorphism, and depletion in the silicic melt component, the constituents of the entire deep crust of the SBZ would have densities similar to those of overlying, much lower-grade Cambrian metabasaltic to boninitic rocks. Thus, granitic magmas may have formed here by partial melting of a variety of rock types, probably with back-arc affinities, with ages that may extend back to the Proterozoic. Therefore, the basement of the SBZ is unlikely to consist solely of thick ocean-floor rocks, as in some current interpretations.
机译：主要来自维多利亚州Stawell，Bendigo和墨尔本结构区的花岗岩和硅藻土岩石，表明Stawell和海滨区（SBZ）对比的S-和I型岩石的来源随着墨尔本区的类似花岗岩岩石来源，随着大部分SBZ下方的主要前兆子塞尔威斯块，始终如一。低于SBZ中的中型地壳Deadollement，地壳显然是高度可变的，并且可能包括稀疏的正导体外壳。在这里有CA 400和CA 370 MA颗粒级变质事件的地理学证据，并且在这种双倍的变质和硅熔化成分中耗尽后，SBZ的整个深地壳的成分将具有类似的密度那些覆盖的，较低的低级寒武纪核心族对Boninitic岩石。因此，花岗岩岩浆可以通过各种岩石类型的部分熔化形成，可能具有后弧亲和力，具有可能延伸回正常古代的年龄。因此，SBZ的基底不太可能仅包括厚的海底岩石，如在一些当前的解释中。

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