Late Paleozoic-Jurassic tectonic evolution of the eastern Deseado Massif in central-southern Patagonia

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
C. Navarrete , J. Bastías-Silva , G. Gianni , G. Jalfin , G. Guerra , M. Hurley , D. Chew , J.M. Turra , M. Ocampo , M.B. Lastra , N. Herbst , M. Iglesias , M. Perez Frasette , F. Drakou
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引用次数: 0

Abstract

Previous tectonic studies have indicated that the peri-cratonic lithosphere, located away from continental margins, is sensitive to far-field stresses propagating from active plate margins, which induce variable deformation. In order to gain a better understanding of potential intraplate tectonic events associated with the geodynamic evolution of the active margin of southwestern Gondwana, we conducted a tectono-sedimentary study of the Permian-Jurassic volcano-sedimentary record in the Deseado Massif, located in southern Patagonia. Our multidisciplinary analysis includes detailed geological mapping of an area of approximately 150 km2, structural analysis, geoelectric tomography, 2D seismic data, new geochronological dating, petrographic studies, and stratigraphic loggings of the volcano-sedimentary basin record. This comprehensive data set has allowed us to establish the tectonic, sedimentary, and magmatic evolution of the eastern Deseado Massif. Specifically, we have identified major normal faults associated with the syn-extensional deposition of late Permian and Jurassic sedimentary and volcanic rocks, as well as the Late Triassic emplacement of intermediate and felsic intrusive bodies. Additionally, interspersed large-scale shortening events were recognized, which induced positive tectonic inversion events in the region, recording contrasting stress fields during the analyzed lapse. Based on this, six major intraplate tectonomagmatic events were defined: (i) a potential post-Devonian pre-late Permian exhumation of the Neoproterozoic-early Paleozoic igneous-metamorphic basement, which we tentatively link to the Gondwanide orogeny; (ii) intraplate extension in the Late Permian (255 ± 4 Ma) related to the deposition of the Dos Hermanos Member of the La Golondrina Formation; (iii) Late Triassic (231 ± 3 Ma) intrusion of andesitic bodies, tentatively linked to the inland migration of arc magmatism associated with the South Gondwana flat slab; (iv) subsequent Late Triassic positive tectonic inversion of Permian extensional faults caused by a large-scale contractional event linked to the South Gondwana flat slab; (v) the extension-related emplacement and deposition of Early-Middle Jurassic (176 ± 3 Ma; 172 ± 4 Ma) sedimentary (lacustrine and fan deltas-related deposits), pyroclastic rocks (ignimbrites and ash tuffs), and lavas (lava domes and dykes) related to the Chon Aike silicic large igneous province; and (vi) poorly-constrained post-Middle Jurassic positive tectonic inversion of Jurassic faults. Therefore, we suggest that the geological events preserved in the Deseado Massif provide a key deformational record of the distal effects associated with ancient geodynamic processes that occurred along the southwestern active margin of Gondwana.

巴塔哥尼亚中南部东Deseado地块晚古生代侏罗系构造演化
先前的构造研究表明,远离大陆边缘的克拉通周围岩石圈对从活动板块边缘传播的远场应力敏感,这会引起可变变形。为了更好地了解与冈瓦纳大陆西南部活动边缘地球动力学演化相关的潜在板内构造事件,我们对位于巴塔哥尼亚南部的Deseado地块的二叠纪-侏罗纪火山沉积记录进行了构造-沉积研究。我们的多学科分析包括约150平方公里区域的详细地质测绘、结构分析、地电断层扫描、二维地震数据、新的地质年代测定、岩相研究和火山-沉积盆地记录的地层测井。这一全面的数据集使我们能够确定东Deseado地块的构造、沉积和岩浆演化。具体而言,我们已经确定了与晚二叠世和侏罗纪沉积岩和火山岩的同伸展沉积有关的主要正断层,以及中英质和长英质侵入体的晚三叠纪侵位。此外,还发现了穿插的大规模缩短事件,这在该地区引发了正的构造反转事件,记录了分析期间的对比应力场。在此基础上,确定了六个主要的板内构造岩浆事件:(i)新元古代早古生代火成变质基底的潜在后泥盆纪-晚二叠纪剥露,我们初步将其与冈瓦纳造山运动联系起来;(ii)与La Golondrina组Dos-Hermanos段沉积有关的二叠纪晚期(255±4 Ma)的板内伸展;(iii)晚三叠世(231±3 Ma)安山岩侵入,暂时与南冈瓦纳大陆平板相关的弧形岩浆活动的内陆迁移有关;(iv)由与南冈瓦纳大陆平板有关的大规模收缩事件引起的二叠纪伸展断层的随后的晚三叠纪正构造反转;(v) 早中侏罗世(176±3 Ma;172±4 Ma)沉积岩(湖泊和扇三角洲相关矿床)、火山碎屑岩(熔结凝灰岩和灰凝灰岩)和熔岩(熔岩圆顶和岩脉)的伸展相关侵位和沉积,与Chon-Aike硅化大型火成岩省有关;以及(vi)侏罗纪断层的约束较差的中侏罗世后正构造反转。因此,我们认为,Deseado地块中保存的地质事件提供了与冈瓦纳大陆西南活动边缘发生的古代地球动力学过程相关的远端效应的关键变形记录。
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来源期刊
Journal of Geodynamics
Journal of Geodynamics 地学-地球化学与地球物理
CiteScore
4.60
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: The Journal of Geodynamics is an international and interdisciplinary forum for the publication of results and discussions of solid earth research in geodetic, geophysical, geological and geochemical geodynamics, with special emphasis on the large scale processes involved.
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