Control of inherited structural fabric on the development and exhumation of passive margins – Insights from the Araçuaí Orogen (Brazil)

IF 8.5 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Geoscience frontiers Pub Date : 2023-05-06 DOI:10.1016/j.gsf.2023.101628
Ana Fonseca , Tiago Novo , Tobias Fonte-Boa , Matheus Kuchenbecker , Daniel Galvão Carnier Fragoso , Daniel Peifer , Antônio Carlos Pedrosa-Soares , Johan De Grave
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Abstract

The Araçuaí Orogen, in eastern Brazil, was formed during the Neoproterozoic – Cambrian amalgamation of West Gondwana. During the Mesozoic – Cenozoic opening of the South Atlantic Ocean, and the associated divergent tectonics, the orogen developed as basement to the passive margin of South America and was progressively covered by thick offshore sedimentary basins, particularly the Espírito Santo, Mucuri, and Cumuruxatiba basins, in which hydrocarbon systems have been exploited. Our understanding of the Araçuaí Orogen's passive margin evolution, erosion, and sediment transfer to these basins ultimately depends on constraining the onshore exhumation in response to Mesozoic – Cenozoic events. Here, new and previously published data from apatite fission-track (AFT) analyses and inverse thermal history modelling of (Pre)Cambrian basement rocks from the Araçuaí Orogen resolve three discrete basement cooling and associated erosional exhumation episodes. In the Pre-Rift phase, Jurassic – Hauterivian erosion of the Araçuaí Orogen is most likely related to the adjoining intra-continental West Gondwana flexural subsidence, which increased hillslope and river erosion power. In the Rift and Transitional phases, Barremian – Albian accelerated phase of erosion is associated with the uplift of the Atlantic rift shoulders and the establishment of an oceanic base-level. In the Drift phase, reactivations in response to far-field stresses likely triggered a Late Cretaceous – Paleocene rapid erosion event. The rates at which these events unfolded vary spatially and are controlled by inherited structures. The Araçuaí Orogen experienced slower denudation rates in areas closer to the São Francisco Craton, which suggests that the tectonic reactivation and related surface uplift during the Mesozoic–Cenozoic is in first-order controlled by lithospheric rigidity. Furthermore, the structural framework of the Paramirim and Pirapora aulacogens and NE-oriented shear zones in the orogen’s southeast facilitated later reactivations. From the spatial pattern of denudation/exhumation of the Araçuaí Orogen during the Mesozoic – Cenozoic, we draw inferences on the tectonic development of the offshore basins regarding their hydrocarbon potentials.

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继承的结构结构对被动边缘发育和挖掘的控制——来自AraçuaíOrogen(巴西)的见解
巴西东部的Araçuaí造山带形成于西冈瓦纳的新元古代-寒武纪合并时期。在南大西洋中新生代开闭期及相关的伸展构造作用下,造山带作为基底向南美洲被动边缘发育,并逐渐被较厚的近海沉积盆地覆盖,特别是Espírito Santo、Mucuri和Cumuruxatiba盆地,这些盆地已开发出油气系统。我们对Araçuaí造山带被动边缘演化、侵蚀和沉积物向这些盆地转移的理解最终取决于限制陆上发掘以响应中新生代事件。在这里,来自Araçuaí造山带(前)寒武纪基底岩石的磷灰石裂变径迹(AFT)分析和逆热史模拟的新数据和先前发表的数据解决了三个离散的基底冷却和相关的侵蚀挖掘事件。在裂谷前阶段,Araçuaí造山带的侏罗纪-豪特里维亚期侵蚀极有可能与毗邻的西冈瓦纳大陆内弯曲沉降有关,后者增加了斜坡和河流的侵蚀力。在裂谷期和过渡期,巴雷米亚-阿尔贝尼亚加速侵蚀期与大西洋裂谷肩的隆升和海洋基准面的建立有关。在漂移阶段,响应远场应力的再激活可能引发了晚白垩世-古新世的快速侵蚀事件。这些事件展开的速度在空间上有所不同,并受遗传结构的控制。Araçuaí造山带在靠近弗朗西斯科克拉通的地区的剥蚀速率较慢,这表明中新生代的构造活化和相关的地表隆升是由岩石圈刚性控制的一级。此外,造山带东南部的帕拉米林裂陷带和皮拉波拉裂陷带的构造格架和ne向剪切带促进了后期的恢复。根据Araçuaí造山带中新生代剥蚀/掘出的空间格局,对近海盆地的构造发育及其油气潜力进行了推断。
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来源期刊
Geoscience frontiers
Geoscience frontiers Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
17.80
自引率
3.40%
发文量
147
审稿时长
35 days
期刊介绍: Geoscience Frontiers (GSF) is the Journal of China University of Geosciences (Beijing) and Peking University. It publishes peer-reviewed research articles and reviews in interdisciplinary fields of Earth and Planetary Sciences. GSF covers various research areas including petrology and geochemistry, lithospheric architecture and mantle dynamics, global tectonics, economic geology and fuel exploration, geophysics, stratigraphy and paleontology, environmental and engineering geology, astrogeology, and the nexus of resources-energy-emissions-climate under Sustainable Development Goals. The journal aims to bridge innovative, provocative, and challenging concepts and models in these fields, providing insights on correlations and evolution.
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