重新审视查恩伍德地体:英国南部地壳结构的岩石成因和岩石物理综合模型

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
T.C. Pharaoh, D. Beamish, J.D.O. Williams, J.N. Carney, P.R.W. Wilby
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引用次数: 0

摘要

通过对c. 570-550 Ma charian火山-沉积杂岩的研究,建立了英国南部埃迪卡拉系地壳的岩石学和岩石物理综合模型。后者位于c. 720-600 Ma marchane幼年大陆地壳内的岩浆裂谷楔中,Ma marchane是在冈瓦纳古大陆边缘形成的俯冲岩浆域。夏期岩浆弧以原始岛弧拉斑岩为主要特征,演化为钙碱性成分。航磁位场数据反演和岩石物理模拟揭示了查尔年域内部构造的细节,包括中间裂谷、叠加环形构造和分区构造。该模型表明,弧底可能含有富含磁铁矿的堆积物,这可能解释了异常的地球物理性质,包括地壳厚度、刚度和浮力。没有证据表明在恰尔年构造域和它的马奇地体之间有明显的构造位移。相反,该区域可能占据了一个楔形弧/边缘裂谷盆地复合体,从邻近的海洋传播到冈瓦纳边缘。570-550 Ma charian岩浆期威尔士边地和威尔士的同时期火山裂谷序列是在扩张不太强烈的marchane岩石圈内的同时期裂谷中发育起来的。在新西兰新近纪-新近纪的Hikurangi破坏性边缘发现了与俯冲相关的岩浆活动的类似多样性,为恰尔期岩浆活动提供了一个合理的类比。补充资料:补充出版物1(钻孔地球物理测井对比;岩石物理数据表;未注释的地球物理图和剖面)和补充出版物2(地球化学分析条件和数据表)可在https://doi.org/10.6084/m9.figshare.c.6805248上获得
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Charnwood Terrane revisited: an integrated petrogenetic and petrophysical model for crustal structure in S Britain
We based an integrated petrological and petrophysical model for the Ediacaran crust of southern Britain on a review of the c. 570–550 Ma Charnian volcano-sedimentary complex. The latter was emplaced in a magmatic rift wedge within the juvenile continental crust of the c. 720–600 Ma Marches Terrane, a subduction magmatic domain formed at the margin of the Gondwana palaeocontinent. The Charnian magmatic arc is characterized by primitive island arc tholeiite to more evolved calc-alkaline compositions. The inversion of aeromagnetic potential field data and petrophysical modelling reveals details of the internal structure of the Charnian Domain, including a median rift, superimposed annular structures and partitioning lineaments. The modelling suggests that the arc foundation could incorporate magnetite-rich cumulates, which may explain the anomalous geophysical properties, including crustal thickness, rigidity and buoyancy. There is no evidence for significant tectonic displacement between the Charnian Domain and its Marches Terrane host. Instead, the domain likely occupies a wedge-shaped arc/marginal rift basin complex, propagated from a neighbouring ocean into the Gondwana margin. Contemporaneous volcanic rift successions in the Welsh Borderland and Wales of the 570–550 Ma Charnian magmatic phase developed in coeval ensialic rifts within less strongly extended Marches Terrane lithosphere. A comparable diversity of subduction-related magmatism is found in the Neogene–recent Hikurangi destructive margin of New Zealand, providing a plausible analogue for Charnian magmatism. Supplementary material: Supplementary Publication 1 (borehole geophysical log correlation; petrophysical data table; unannotated geophysical maps and sections) and Supplementary Publication 2 (geochemistry analytical conditions and data table) are available at https://doi.org/10.6084/m9.figshare.c.6805248
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来源期刊
Journal of the Geological Society
Journal of the Geological Society 地学-地球科学综合
CiteScore
6.00
自引率
3.70%
发文量
68
审稿时长
6-12 weeks
期刊介绍: Journal of the Geological Society (JGS) is owned and published by the Geological Society of London. JGS publishes topical, high-quality recent research across the full range of Earth Sciences. Papers are interdisciplinary in nature and emphasize the development of an understanding of fundamental geological processes. Broad interest articles that refer to regional studies, but which extend beyond their geographical context are also welcomed. Each year JGS presents the ‘JGS Early Career Award'' for papers published in the journal, which rewards the writing of well-written, exciting papers from early career geologists. The journal publishes research and invited review articles, discussion papers and thematic sets.
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