阿根廷东部前科迪勒拉古生代构造和气候转变时期的沉积物物源和沉积体系

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research Pub Date : 2024-12-09 DOI:10.1016/j.gr.2024.11.013

Nicholas A. Regier, Brian K. Horton, Daniel Starck, Facundo Fuentes, Erin E. Donaghy, Michael P. Eddy, Tomas N. Capaldi

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引用次数: 0

摘要

阿根廷西部的Precordillera显示了一个复杂的前安第斯地层记录，与冈瓦纳西南缘古生代辐合有关。前科迪勒拉东部志留系Rinconada组和石炭系Jejenes组的沉积学和U-Pb碎屑锆石年代学结果为研究古生代变形和冰川作用期间的沉积物来源、水系重组和气候/构造相互作用提供了新的线索。实测剖面和岩相分析表明，在邻近的法马梯系造山带缩短期，志留系海底扇形成了重力流和物质输运沉积。该前陆盆地在晚泥盆世Chanic造山运动中变形，在晚古生代冰期冰川切割残余地形之前。石炭系古峡谷（Quebrada Grande, Sierra Chica de Zonda）的不整合面、横切关系和岩相分析表明，在冰川进退控制的峡湾环境中，有四种相组合（峡湾头三角洲、峡湾远端三角洲、扇三角洲和冰下扇）。石炭系砂岩（7个样品，840个分析）的U-Pb结果表明，其衍生自西潘潘纪基底，并经历了递进式的水系扩张，包括法马汀期岩浆弧和东潘潘亚山脉。从志留纪海相前陆盆地到孤立的石炭纪峡湾的演变反映了冈瓦纳西南地区主要的造山和气候转变。奥陶-志留纪（法马纪）和晚泥盆世（Chanic期）缩短产生的地形后来在石炭世期间被冰川侵蚀成斜面。研究认为，与俯冲和地壳碰撞有关的古生代变形驱动了沉积扩散和盆地形态的变化，而区域冰川时期的气候变化调节了侵蚀/沉积和沉积物容纳的空间范围。

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Sediment provenance and depositional systems during Paleozoic tectonic and climatic transitions in the eastern Precordillera of Argentina

The Precordillera of western Argentina displays a complex pre-Andean stratigraphic record related to Paleozoic convergence along the SW margin of Gondwana. Sedimentologic and U-Pb detrital zircon geochronological results for the Silurian Rinconada Formation and Carboniferous Jejenes Formation of the eastern Precordillera provide insight into sediment provenance, drainage reorganization, and climatic/tectonic interactions during Paleozoic deformation and glaciation. Measured sections and lithofacies analyses indicate sediment gravity flow and mass-transport deposition in a Silurian submarine fan during shortening in the adjacent Famatinian orogenic belt. This foreland basin was deformed during the Late Devonian Chanic orogeny, prior to glacial incision of remnant topography during the Late Paleozoic Ice Age. Analyses of unconformities, cross-cutting relationships, and lithofacies within a Carboniferous paleovalley (Quebrada Grande, Sierra Chica de Zonda) indicate four facies associations (fjord-head delta, distal fjord, fan delta, and subglacial fan) within a fjord setting governed by glacial advance and retreat. U-Pb results for Carboniferous sandstones (7 samples, 840 analyses) indicate derivation from Western Pampean basement with progressive drainage expansion to include the Famatinian magmatic arc and Eastern Sierras Pampeanas. Evolution from a Silurian marine foreland basin to an isolated Carboniferous fjord reflects major orogenic and climatic transitions in SW Gondwana. Ordovician-Silurian (Famatinian) and Late Devonian (Chanic) shortening generated topography that was subsequently beveled by glacial erosion during the Carboniferous. We suggest that Paleozoic deformation related to subduction and terrane collision helped drive changes in sediment dispersal and basin configuration, while climate changes during regional glaciation regulated erosion/deposition and the spatial extent of sediment accommodation.

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来源期刊

Gondwana Research 地学-地球科学综合

CiteScore

12.90

自引率

6.60%

发文量

298

审稿时长

65 days

期刊介绍： Gondwana Research (GR) is an International Journal aimed to promote high quality research publications on all topics related to solid Earth, particularly with reference to the origin and evolution of continents, continental assemblies and their resources. GR is an "all earth science" journal with no restrictions on geological time, terrane or theme and covers a wide spectrum of topics in geosciences such as geology, geomorphology, palaeontology, structure, petrology, geochemistry, stable isotopes, geochronology, economic geology, exploration geology, engineering geology, geophysics, and environmental geology among other themes, and provides an appropriate forum to integrate studies from different disciplines and different terrains. In addition to regular articles and thematic issues, the journal invites high profile state-of-the-art reviews on thrust area topics for its column, ''GR FOCUS''. Focus articles include short biographies and photographs of the authors. Short articles (within ten printed pages) for rapid publication reporting important discoveries or innovative models of global interest will be considered under the category ''GR LETTERS''.