洛根奖得主辉锑矿复合体、花岗岩基和地壳生长:一个概念模型

IF 1.8 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Geoscience Canada Pub Date : 2022-12-17 DOI:10.12789/geocanj.2022.49.191
J. Murphy, W. J. Collins, D. Archibald
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引用次数: 1

摘要

Appinite岩体是一套深成岩,成分从超镁铁质到长英质不等,其特征是自形角闪石是所有岩性中的主要镁铁质矿物,其结构极其多样,包括平面和线性岩浆组构、镁铁质伟晶岩以及同时代镁铁质和长英质成分混合的广泛证据。这些特征表明,异常富含水的岩浆结晶,根据有限的同位素研究,这种岩浆既有地幔成分,也有大气成分。Appinite岩体通常以小型(直径约2km)杂岩的形式出现,沿花岗岩类深成岩体的外围侵位,通常与主要的深部地壳断层相邻,在上升过程中优先利用这些断层。一些研究强调了花岗岩侵入、花岗岩类深成作用和俯冲终止之间的关系。然而,最近的地质年代数据表明,安皮岩和花岗岩类岩浆的生成和俯冲之间存在着更为长期的成因关系。Appinite可能代表含水玄武岩岩浆的等分试样,这些岩浆来源于不同分馏的镁铁质底板,最初在莫霍附近的长期俯冲过程中侵位,通过上覆MASH带的部分熔融引发大量花岗质岩浆的生成。来自该底板的含水镁铁质岩浆可能在地壳中上层(约3-6 kbar,15 km深)上升、积累和分化,并在水饱和条件下结晶。当瞬态应力激活了定向良好的结构,这些结构成为岩浆输送的管道时,花岗岩类岩浆以脉冲形式侵位。然而,晚镁铁质岩浆的上升受到结构上覆的花岗质岩浆体形成的流变屏障的阻碍。形成阿皮岩杂岩的岩浆避开了这些流变障碍,因为它优先利用了深成岩体系统的深层地壳断层。在这种情况下,阿皮岩杂岩可能与镁铁质底板直接相连,因此其大多数镁铁质成分可能会深入了解生成花岗岩岩基的过程,更广泛地说,了解弧系中的地壳生长。
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Logan Medallist 7. Appinite Complexes, Granitoid Batholiths and Crustal Growth: A Conceptual Model
Appinite bodies are a suite of plutonic rocks, ranging from ultramafic to felsic in composition, that are characterized by idiomorphic hornblende as the dominant mafic mineral in all lithologies and by spectacularly diverse textures, including planar and linear magmatic fabrics, mafic pegmatites and widespread evidence of mingling between coeval mafic and felsic compositions. These features suggest crystallization from anomalously water-rich magma which, according to limited isotopic studies, has both mantle and meteoric components. Appinite bodies typically occur as small (~2 km diameter) complexes emplaced along the periphery of granitoid plutons and commonly adjacent to major deep crustal faults, which they preferentially exploit during their ascent. Several studies emphasize the relationship between intrusion of appinite, granitoid plutonism and termination of subduction. However, recent geochronological data suggest a more long-lived genetic relationship between appinite and granitoid magma generation and subduction.Appinite may represent aliquots of hydrous basaltic magma derived from variably fractionated mafic underplates that were originally emplaced during protracted subduction adjacent to the Moho, triggering generation of voluminous granitoid magma by partial melting in the overlying MASH zone. Hydrous mafic magma from this underplate may have ascended, accumulated, and differentiated at mid-to-upper crustal levels (ca. 3–6 kbar, 15 km depth) and crystallized under water-saturated conditions. The granitoid magma was emplaced in pulses when transient stresses activated favourably oriented structures which became conduits for magma transport. The ascent of late mafic magma, however, is impeded by the rheological barriers created by the structurally overlying granitoid magma bodies. Magma that forms appinite complexes evaded those rheological barriers because it preferentially exploited the deep crustal faults that bounded the plutonic system. In this scenario, appinite complexes may be a direct connection to the mafic underplate and so its most mafic components may provide insights into processes that generate granitoid batholiths and, more generally, into crustal growth in arc systems.
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来源期刊
Geoscience Canada
Geoscience Canada 地学-地球科学综合
CiteScore
3.30
自引率
0.00%
发文量
9
审稿时长
>12 weeks
期刊介绍: Established in 1974, Geoscience Canada is the main technical publication of the Geological Association of Canada (GAC). We are a quarterly journal that emphasizes diversity of material, and also the presentation of informative technical articles that can be understood not only by specialist research workers, but by non-specialists in other branches of the Earth Sciences. We aim to be a journal that you want to read, and which will leave you better informed, rather than more confused.
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