Lithologic variations in Otago Schist, Mt Aspiring area, northwest Otago, New Zealand
Lithologic variations in Otago Schist, Mt Aspiring area, northwest Otago, New Zealand
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新西兰奥塔哥西北部阿斯帕林山地区奥塔哥片岩的岩性变化
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发表时间：
1984
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通讯作者：
D. Craw
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作者：
D. Craw
摘要新西兰奥塔哥西北部奥塔哥片岩4号结构带的露头尺度上可识别出砂质片岩、2种泥质片岩（灰色和变斑质）和4种绿片岩（变火山岩-浅色、斑点状、叶理状和绿帘石丰富）。变粗岩、大理岩和超镁铁质岩的薄层通常与绿片岩有关。具有1种主要岩石类型（绿片岩、砂质岩、灰色泥质岩或变斑状泥质岩）的广泛单元可在区域尺度上绘制。这些单元也包含大部分或所有上述岩石类型，边界不明确。这些大单元内部和之间的原始地层连续性程度是未知的。研究区域可细分为2个岩性组合，“Aspiring组合”和东部“Wanaka组合”，由一个北向、边界不清但岩性分级的边界分开。Aspiring组合主要由泥质岩石类型组成，具有相当大的质量。
Abstract Psammitic schist, 2 types of pelitic schist (grey and porphyroblastic), and 4 types of greenschist (metavolcanic rock — light, spotted, foliated, and epidote rich) are recognisable on outcrop scale in textural zone 4 of the Otago Schist, northwest Otago, New Zealand. Thin horizons of metachert, marble, and ultramafic rock are commonly associated with greenschist. Broad units with 1 predominant rock type (greenschist, psammite, grey pelite, or porphyroblastic pelite) are mappable on a regional scale. These units also contain most or all of the above rock types and have poorly defined boundaries. The degree of original Stratigraphic continuity within and between these broad units is unknown. The studied area can be subdivided into 2 lithologic associations, the “Aspiring association” and the eastern “Wanaka association”, separated by a north-trending, poorly defined but lithologically gradational boundary. The Aspiring association is made up predominantly of pelitic rock types with considerable qua...