Identification of mantle peridotite as a possible Iapetan ophiolite sliver in south Shetland, Scottish Caledonides

Identification of mantle peridotite as a possible Iapetan ophiolite sliver in south Shetland, Scottish Caledonides
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苏格兰喀里多尼德群岛南设得兰群岛将地幔橄榄岩鉴定为可能的 Iapetan 蛇绿岩条

DOI:
10.1144/jgs2016-074
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发表时间:
2016
影响因子:
2.7
通讯作者:
Day J
Day J
中科院分区:
地球科学2区
文献类型:
--
作者:
Day J

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苏格兰南设得兰的新元古代Dunrossness Spilite亚群被解释为响应Laurentian大陆边缘裂谷作用而形成于边缘盆地的一系列科马岩质和基性熔岩流。研究表明,超镁铁质岩石是经过海底热液蚀变的枯竭地幔橄榄岩。从Dunrossness碧绿岩亚群向北延伸至设得兰蛇绿岩杂岩的正布格重力和航磁异常的存在表明,这些岩石可能是在弧前环境下Iapetus海洋闭合期间被逆冲的广泛蛇绿岩银条的一部分。补充资料:补充资料,包括方法、补充图和表格数据,可在https://doi.org/10.6084/m9.figshare.c.3469161上获得。
The Neoproterozoic Dunrossness Spilite Subgroup of south Shetland, Scotland, has been interpreted as a series of komatiitic and mafic lava flows formed in a marginal basin in response to Laurentian continental margin rifting. We show that ultramafic rocks previously identified as komatiites are depleted mantle peridotites that experienced seafloor hydrothermal alteration. The presence of positive Bouguer gravity and aeromagnetic anomalies extending from the Dunrossness Spilite Subgroup northward to the Shetland Ophiolite Complex suggests instead that these rocks may form part of an extensive ophiolite sliver, obducted during Iapetus Ocean closure in a forearc setting.Supplementary material: Supplementary information, including methods, supplementary figures and tabulated data, is available at https://doi.org/10.6084/m9.figshare.c.3469161.
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