Integrated facies and petrographic analysis of the Whisky Bay Formation (Albian–Turonian), Larsen Basin, James Ross Island, Antarctica: depositional systems and arc-sourced detritus

IF 1.5 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Journal of South American Earth Sciences Pub Date : 2025-08-05 DOI:10.1016/j.jsames.2025.105719

Lucas Henrique Batista da Silva , Renato Rodriguez Cabral Ramos , Marcelo de Araújo Carvalho

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Abstract

This study presents an integrated facies and petrographic analysis of the Albian–Turonian Whisky Bay Formation (Gustav Group, Larsen Basin) on James Ross Island, Antarctica, to reconstruct depositional systems and evaluate arc-derived detrital input. Two stratigraphic profiles (totaling 130 m) were analyzed alongside petrographic data from 30 sandstone and rudite samples. Three lithofacies associations (FA1–FA3) were identified: (1) slope-apron breccias and sandstones (FA1), formed by debris flows and low-density turbidity currents linked to fault-scarp erosion; (2) sand-rich turbidites (FA2), deposited by high-efficiency turbidity currents through slope-attached canyons; and (3) volcaniclastic submarine fans (FA3), dominated by volcaniclastic conglomerates sourced from active arc magmatism. Petrographic data reveal lithic sandstones dominated by volcanic fragments (75–88 %), fresh plagioclase, and minor quartz/metasedimentary clasts, indicating provenance from the Antarctic Peninsula Volcanic Group (APVG) and Trinity Peninsula Group (TPG). Provenance-tectonic linkages highlight syn-sedimentary faulting and Aptian–Turonian arc flare-ups during Cretaceous evolution of the Larsen Basin. The stratigraphic transition from fault-driven aprons (FA1) to volcaniclastic fans (FA3) reflects a tectonostratigraphic system controlled by alternating differential subsidence and arc magmatism dynamics.

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南极James Ross岛Larsen盆地Whisky Bay组（Albian-Turonian）相岩相综合分析：沉积体系和弧源碎屑岩

本研究对南极洲James Ross岛的albiian - turonian Whisky Bay组（Larsen Basin Gustav Group）进行了相岩学综合分析，以重建沉积体系并评价弧源碎屑输入。两个地层剖面（总计130 m）与30个砂岩和粗砂岩样品的岩石学数据一起进行了分析。确定了3种岩相组合（FA1 - fa3）：(1)坡缘角砾岩和砂岩（FA1），由断崖侵蚀相关的泥石流和低密度浑浊流形成；(2)富砂浊积岩（FA2），由高效浊积流通过附坡峡谷沉积；(3)火山碎屑海底扇（FA3），以源自活动弧岩浆活动的火山碎屑砾岩为主。岩石学资料显示，岩屑砂岩以火山碎屑（75 ~ 88%）、新鲜斜长石和少量石英/变质沉积岩碎屑为主，表明物源来自南极半岛火山群（APVG）和三一半岛群（TPG）。在Larsen盆地白垩纪演化过程中，物源-构造联系突出了同沉积断裂和阿普天- turonian弧爆发。从断裂驱动的环形带（FA1）到火山碎屑扇（FA3）的地层过渡反映了一个由交替的差异沉降和弧岩浆活动动力学控制的构造地层体系。

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来源期刊

Journal of South American Earth Sciences 地学-地球科学综合

CiteScore

3.70

自引率

22.20%

发文量

364

审稿时长

6-12 weeks

期刊介绍： Papers must have a regional appeal and should present work of more than local significance. Research papers dealing with the regional geology of South American cratons and mobile belts, within the following research fields: -Economic geology, metallogenesis and hydrocarbon genesis and reservoirs. -Geophysics, geochemistry, volcanology, igneous and metamorphic petrology. -Tectonics, neo- and seismotectonics and geodynamic modeling. -Geomorphology, geological hazards, environmental geology, climate change in America and Antarctica, and soil research. -Stratigraphy, sedimentology, structure and basin evolution. -Paleontology, paleoecology, paleoclimatology and Quaternary geology. New developments in already established regional projects and new initiatives dealing with the geology of the continent will be summarized and presented on a regular basis. Short notes, discussions, book reviews and conference and workshop reports will also be included when relevant.