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首页> 外文期刊>Contributions to Mineralogy and Petrology >Genesis of intermediate igneous rocks at the end of the Sveconorwegian (Grenvillian) orogeny (S Norway) and their contribution to intracrustal differentiation
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Genesis of intermediate igneous rocks at the end of the Sveconorwegian (Grenvillian) orogeny (S Norway) and their contribution to intracrustal differentiation

机译：Sveconorwegian（Grenvillian）造山带（S Norway）末期的火成岩的成因及其对壳内分化的贡献

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摘要

Abundant ferroan, metaluminous granitoids (970–950 Ma) emplaced at the end of the Sveconorwegian collisional orogeny (1130–900 Ma) are dominated by intermediate to silicic compositions with rare mafic facies. Both 73% fractional crystallization of an amphibole-bearing gabbroic cumulate substracted from the parent mafic composition and 30% non-modal batch melting of an amphibolitic source equivalent in composition to the mafic facies produce a monzodioritic liquid with appropriate trace element composition. A better fit is obtained for the partial melting process. Both processes could have occurred simultaneously to produce mafic cumulates and restites. As there is no evidence for large volumes of dense mafic rocks in the Sveconorwegian upper crust, these dense mafic rocks were probably produced in the lower crust. Formation of these granitoids, thus, contributed to the vertical stratification of the Proterozoic continental crust and also to the transfer of water from the lower crust to the surface.
机译：在Sveconorwegian碰撞造山作用（1130–900 Ma）末期放置的大量铁质，金属质花岗岩（970–950 Ma）主要由中性至硅质成分组成，并具有罕见的镁铁质相。从母体铁镁铁质成分中减去含角闪石的辉长岩的73％的分步结晶，以及组成与铁镁质相相当的闪石质来源的30％非模式分批熔融，都会产生具有适当痕量元素组成的单生辉石液体。对于部分熔融过程获得了更好的配合。这两个过程本来可以同时发生，以产生铁镁矿的累积物和辉石。由于没有证据表明Sveconorwegian上地壳中有大量致密的镁铁质岩石，这些致密的镁铁质岩石可能是在下地壳中产生的。因此，这些类花岗岩的形成有助于元古代陆壳的垂直分层，也有助于水从下地壳转移到地表。

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