Mid-Crustal Anatexis and Hybridization Associated With Mafic Plutonism in the Bindal Batholith, Norwegian Caledonides

9814280 barnes造山活动通常伴随着花岗岩岩浆的侵位，其起源目前尚有争议。在许多情况下，花岗质岩浆是由源自地幔的热岩浆与地壳岩石结合而形成的混合体。在其他情况下，花岗岩岩浆显示出纯地壳起源的同位素和元素证据。地壳的起源通常需要传递足够的热量来引起融化。许多研究者认为，从热的地幔岩浆中提取的热量是这种地壳融化的主要来源。在挪威中北部的Velfjord地区，一组地幔衍生的岩体几乎被一层花岗岩所包围，这些花岗岩显然是由当地的熔融形成的；热是由地幔源岩体的侵入提供的。由于规模小，这种设置提供了一个极好的机会来研究地壳融化和热岩浆提供的热量之间的关系。研究将集中在确定熔融条件、熔融的热要求、花岗岩熔体的流动性以及地壳熔体与其岩浆“热源”之间的化学相互作用。研究结果将提供一个直接的类似于发生在地壳尺度上的融化。

9814280BarnesMountain building events are commonly accompanied by emplacement of granitic magmas, the origins of which are currently in debate. In many cases, granitic magmas are hybrids which form when hot magmas derived from the mantle combine with crustal rocks. In other cases, granitic magmas show isotopic and elemental evidence of a purely crustal origin. A crustal origin typically requires transfer of heat sufficient to cause melting. Many investigators call on heat extracted from hot, mantle-derived magmas as the primary source of such crustal melting. In the Velfjord area of north-central Norway, a group of mantle-derived plutons are nearly surrounded by a rind of granitic rocks that were apparently derived by local melting; heat was provided by intrusion of the mantle-derived plutons. Because of the small scale, this setting provides an excellent opportunity to investigate the relationship between crustal melting and heat provided by hotter magmas. Research will focus on determination of the conditions of melting, the thermal requirements for melting, mobility of the granitic melts, and chemical interaction between the crustal melts and their magmatic "heat source". The results will provide a direct analogue to melting that occurs on a crustal scale.