重新审视伊比利亚的密西西比岩层:同生碳酸盐平台/礁石破坏的构造驱动因素

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/jgs2023-187
Í. F. Dias da Silva, Manuel Francisco Pereira, E. G. Clavijo, José Brandão Silva
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引用次数: 0

摘要

本文回顾了伊比利亚瓦里斯坎造山带冈瓦纳一侧形成的同生盆地,重点介绍了伊比利亚瓦里斯坎盆地中广泛存在的钙质透辉石地层和含有礁灰岩鲕粒的鲕粒岩。利用瓦里斯坎造山作用的主要实例(Azrou-Khenifra 和 Rhenohercynian 盆地)进行比较,讨论了这些鲕粒和蝇状沉积的意义。我们对伊比利亚瓦里斯坎带的构造模型提出了造成钙华岩和鲕粒起源的同生碳酸盐平台/礁破坏的可能驱动因素。一种模型认为,在劳鲁西亚-冈瓦纳汇聚的背景下,部分熔融的造山根系通过横向流动形成了造山高原,之后莱茵洋遭到破坏,冈瓦纳(下)板块板块后退。另一种模型则认为冈瓦纳(上)板块下的古特提斯大洋岩石圈发生了俯冲。这两种模式都强调了密西西比时期冈瓦纳板块下方出现了明显的热异常,这有利于岩石圈的强烈减薄,为同生碳酸盐平台/礁的破坏以及伊比利亚方解石沉积和鲕粒的形成创造了理想的条件。在这两种情况下,变石期古地貌看起来都是一样的。因此,由于密西西比时期片麻岩穹隆上部结构的区域构造运移运动学存在差异,要区分这些模式并非易事。 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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Mississippian olistostromes of Iberia revisited: Tectonic drivers of synorogenic carbonate platform/reef destruction
A review of the synorogenic basins formed on the Gondwana side of the Variscan orogen of Iberia is presented, highlighting the widespread ocurrence of calciturbiditic formations and olistostromes containing reef-limestone olistoliths in Iberia's Variscan basins. Using key-examples from the Variscan orogen for comparison (Azrou-Khenifra and Rhenohercynian basins), the significance of these olistostromes and flyschoid deposits is discussed. Our tectonic models of the Variscan belt in Iberia propose possible drivers of synorogenic carbonate platform/reef destruction responsible for the origin of calciturbidites and olistostromes. One model proposes the formation of an orogenic plateau by lateral flow of partially molten orogenic roots in the context of Laurussia-Gondwana convergence, following the destruction of the Rheic Ocean and Gondwana (lower) plate slab retreat. An alternative model invokes subduction of Paleotethys oceanic lithosphere beneath the Gondwana (upper) plate. Both emphasize the Mississippian occurrence of a significant thermal anomaly beneath Gondwana that favored strong lithosphere thinning, creating ideal conditions for synorogenic carbonate platform/reef destruction, and for the formation of calciturbidite deposits and olistostromes in Iberia. Variscan paleotopography would look alike in both situations. Thus, distinguishing these models is not straightforward, with differences in the kinematics of the regional tectonic transport in the superstructure of Mississippian gneiss domes. 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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