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首页> 外文期刊>Journal of geodynamics >Nick Rast and the recognition of the Avalonian Arc
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Nick Rast and the recognition of the Avalonian Arc

机译：尼克·拉斯特（Nick Rast）和阿瓦隆弧线的认可

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摘要

Recognition of the eastern (Avalonian) margin of the northern Appalachian orogen as a Late Pre-cambrian microcontinental arc terrane, rather than the opposing passive margin of the Proto-Atlantic (lapetus) Ocean to that of eastern Laurentia, constituted a fundamental advance in Appalachian geology that profoundly influenced subsequent models for the orogen's plate tectonic evolution. This advance was first clearly articulated by Nick Rast and his students in 1976, who, by correlating rocks of the Avalon Platform with those of the British Midlands, established the Avalonian volcanic belt as a Japan-like microcontinent. Contrary to contemporary views of the Avalon Platform, which favored an extensional, Basin and Range-like setting for its volcanism, Rast argued on the basis of this correlation that the association of Avalonian voleanism with compressional orogeny, widespread calc-alkaline plutonism and, in Angelsey, with blueschists and ophiolitic rocks, indicated a convergent plate margin setting. Rast further proposed that the Avalonian volcanic belt was ensialic, and was bordered to the northwest and southeast by Precambrian oceanic domains. Contemporary reconstructions of the Avalonian and Cadomian belts as fragments of a Cordilleran-like accretionary orogen that developed along an active margin of Neoproter-ozoic Gondwana owe their origin to these early ideas and, while far removed from the tectonic model that Rast envisaged, are a direct heritage of his recognition of the Avalonian volcanic belt as a microcontinental arc terrane.
机译：将阿巴拉契亚北部造山带的东部（阿瓦隆）边缘识别为前寒武纪的微大陆弧地层，而不是原始大西洋（斜角）海洋相对于劳伦西亚东部的被动边缘，这是阿巴拉契亚山脉的根本进展地质学对造山带板块构造演化的后续模型产生了深远的影响。尼克·拉斯特（Nick Rast）和他的学生在1976年首先清楚地阐明了这一进步，他们通过将阿瓦隆月台的岩石与英国中部地区的岩石联系起来，将阿瓦隆火山带建立为类似于日本的微洲。与当代对Avalon平台的看法相反，Avalon平台主张火山作用具有延伸性，盆地和山脉状的背景，Rast在这种相关性的基础上指出，阿瓦隆火山作用与压缩造山运动，广泛的钙碱性岩溶作用以及安琪尔西（Angelsey）拥有蓝片岩和蛇绿岩，表明板块边缘趋于收敛。拉斯特进一步提出，阿瓦隆火山带是真西亚的，并与前寒武纪海洋域接壤到西北和东南。阿瓦隆带和卡多马带的当代重建是像科迪勒兰增生造山带的碎片，沿着新元古代生代冈瓦纳的活跃边缘发展的，这源于这些早期观点，尽管与拉斯特设想的构造模型相去甚远他承认阿瓦隆火山带为微大陆弧地层的直接传承。

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