New stratigraphic and paleontological data from carbonates related to the Vourinos-Pindos ophiolite emplacement: Implications for the provenance of the ophiolites (Hellenides)

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of the Geological Society Pub Date : 2023-11-13 DOI:10.1144/jgs2023-127
Georgia Kostaki, Hans-Jürgen Gawlick, Sigrid Missoni, Adamantios Kilias, Emmanouil Katrivanos
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Abstract

Microfacies analysis and conodont dating on carbonates associated with the Vourinos-Pindos ophiolite emplacement on the Pelagonian unit in northern Greece, combined with structural analysis, enhance our understanding of the palaeogeography and geotectonic evolution of the Hellenides. We focus on a dismembered Triassic Hallstatt Limestone succession incorporated as blocks in the Middle-Late Jurassic Avdella ophiolitic mélange, which is identical to a Triassic succession in the western Pindos (Hallstatt/Pindos succession). Initially, the Hallstatt/Pindos succession was deposited on the outer shelf along the eastern Pelagonian margin and later incorporated into the mélange during west-directed obduction processes. During the Middle to early Late Jurassic, ophiolites obducted on the eastern Pelagonian margin, resulting in a nappe stack in front of the ophiolites in the lower plate position. Newly formed trench-like basins in front of the advancing nappe stack became filled with sedimentary mélanges, consisting of ophiolitic material mixed with blocks from the Hallstatt/Pindos succession, deposited in an outer shelf position. Subsequently, the Pindos ophiolites overthrust their foreland basin, forming a typical ophiolitic mélange (Avdella mélange). Consequently, the Triassic-Middle Jurassic Hallstatt/Pindos succession represents a far-traveled Middle-Late Jurassic nappe deriving east of the Pelagonian unit, which was bulldozed westward in front of the west-directed obducting Neotethys ophiolites. 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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与Vourinos-Pindos蛇绿岩位有关的碳酸盐地层和古生物新资料:对蛇绿岩(Hellenides)物源的启示
希腊北部Pelagonian单元Vourinos-Pindos蛇绿岩侵位碳酸盐的微相分析和牙形石定年,结合构造分析,增强了我们对Hellenides古地理和大地构造演化的认识。在中晚侏罗世Avdella蛇绿岩msamulange中,我们重点研究了三叠纪Hallstatt灰岩序列的肢解,该序列与西品多斯三叠纪(Hallstatt/Pindos序列)相同。最初,Hallstatt/Pindos演替沉积在沿东Pelagonian边缘的外大陆架上,后来在西向的逆冲过程中被合并到m lanange中。晚侏罗世中早期,蛇绿岩在东伯拉哥尼亚边缘逆冲,形成下板块位置蛇绿岩前面的推覆体。在推进的推覆层前新形成的海沟状盆地充满了沉积体,这些沉积体由蛇绿质物质与Hallstatt/Pindos演替的块体混合组成,沉积在外陆架位置。随后,品多蛇绿岩逆冲其前陆盆地,形成典型的蛇绿岩型杂岩(Avdella msamuange)。因此,三叠纪-中侏罗统Hallstatt/Pindos序列代表了一段起源于Pelagonian单元以东的中晚侏罗统推覆体,该推覆体在向西逆冲的新特提斯蛇绿岩前向西推平。专题收藏:这篇文章是蛇绿岩、杂色岩和蓝片岩收藏的一部分,可在https://www.lyellcollection.org/topic/collections/ophiolites-melanges-and-blueschists上找到
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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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