利古里亚沉积楔(托斯卡纳亚平宁山脉)的剥蚀和浅蛇绿岩增生:海底结构继承的作用

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of the Geological Society Pub Date : 2024-01-05 DOI:10.1144/jgs2023-189
G. Nirta, F. Remitti, Edoardo Barbero, A. Festa
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引用次数: 0

摘要

托斯卡纳亚平宁山脉(意大利)的莫雷洛构造单元是构造沉积变形的结果,发生在未变质的利古里亚沉积楔的正面部分,由蛇绿岩切片与含蛇绿岩沉积泥岩的沉积演替交错组成。通过地质测绘、构造和地层学观察,我们发现:(i) 含蛇绿石的沉积泥岩是在中始新世增生阶段之前,对来自侏罗纪至下始新世大洋盆地环境的海盆内构造高地的物质进行重力再加工而形成的;(ii) 蛇绿岩构造切片代表了这些地壳大洋高地序列的一部分在浅构造层面上被刮除。利古里亚增生楔浅锋面部分的最终内部结构与在全世界变质造山带和出露增生复合体(如西阿尔卑斯山的蓝晶岩和绿帘岩单元)中观察到的结构并无不同。这表明,除了传统的俯冲和变质,然后是增生和叠层形成(即欠增生)的模式之外,还可以增加一种模式,即在浅层的锋面增生和蛇绿岩叠层形成之后是欠推和俯冲,从而为更好地重建造山带和增生复合体的演化提供更多的制约因素。 专题文集:本文是蛇绿岩、熔岩和蓝晶岩文集的一部分,可在以下网址查阅:https://www.lyellcollection.org/topic/collections/ophiolites-melanges-and-blueschists。
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Offscraping and shallow ophiolite accretion in the Ligurian Accretionary Wedge (Tuscan Apennines): role of seafloor structural inheritance
The Morello Tectonic Unit in the Tuscan Apennines (Italy) represents the result of tectono-sedimentary deformation, occurring in the frontal part of the non-metamorphosed Ligurian Accretionary Wedge, which consists of ophiolitic slices imbricated with a sedimentary succession containing ophiolite-bearing sedimentary mélanges. Geological mapping, structural and stratigraphic observations, allow us to document that (i) the ophiolite-bearing sedimentary mélanges formed by gravitational reworking of material sourced from intrabasinal structural highs facing the oceanic basin environment from Jurassic to lower Eocene, before the middle Eocene accretion stage, and (ii) the ophiolitic tectonic slices represent the scraping off at shallow structural levels of part of these crustal oceanic highs sequence. The final internal architecture of the shallow frontal portion of the Ligurian Accretionary Wedge does not differ from those observed in metamorphosed orogenic belts and exhumed accretionary complexes throughout the world (e.g., blueschist and eclogite units of Western Alps). This suggests that to the classical model of subduction and metamorphism followed by accretion and mélange formation (i.e., underplating), a model in which frontal accretion and ophiolite mélange formation at a shallow level are followed by underthrusting and subduction can be added, providing additional constraints to a better reconstruction of orogenic belts and accretionary complexes evolution. Thematic collection: This article is part of the Ophiolites, melanges and blueschists collection available at: https://www.lyellcollection.org/topic/collections/ophiolites-melanges-and-blueschists
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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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