Influence of Late Carboniferous–Early Permian climate change on the sedimentary evolution – a case study of the lacustrine Lower Anthracosia Shales (Intra-Sudetic Basin, SW Poland)

IF 0.9 4区 地球科学 Q3 GEOLOGY Geological Quarterly Pub Date : 2024-04-25 DOI:10.7306/gq.1728
Jolanta Dąbek-Głowacka, Patrycja Wójcik-Tabol, Grzegorz J. Nowak
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Abstract

 

 

 

 

The Anthracosia Shales are lacustrine deposits within the volcano-sedimentary Pennsylvanian– Lower Permian succession of the Intra-Sudetic Basin. Core from the Rybnica Leśna PIG 1 borehole, which penetrated the Lower Anthracosia Shales, was analysed to explore the influence of climate on the evolution of the palaeolake, as distinct from tectonic and volcanic forcing. This reconstruction was made using mineralogical and geochemical proxies (elemental and mineralogical composition, TOC values, presence of framboidal pyrite and siderite). Based on the results, three chemically different intervals previously introduced by Wójcik-Tabol et al. (2021) are described. They represent the following stages of lake evolution: transgression (interval I), open lake (interval IIA and IIB), and termination (interval IIC and III). The initial stage of the lake (interval I) was probably related to a rise in humidity in the Late Pennsylvanian, linked to a southern Gondwana interglacial episode. Interval IIA represents the deepest facies of the Anthracosia Basin, where lake-floor anoxia prevailed. This stage was followed by a gradual lake-level fall recorded in interval IIB, with documented seasonality in humid and warm conditions. Interval IIC represents a stepwise lake regression attributed to aridification, as indicated by proxies showing a decrease in chemical weathering. Turbiditic sandy laminae in interval III reflect the terminal stage of lake infill.

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石炭纪晚期-二叠纪早期气候变化对沉积演化的影响--以湖泊下安特拉科夏页岩(波兰西南部内苏台德盆地)为例进行研究
Anthracosia 页岩是内苏台德盆地火山沉积型宾夕法尼亚-下二叠统演替中的湖相沉积。对穿透下安特拉科夏页岩的 Rybnica Leśna PIG 1 号钻孔的岩芯进行了分析,以探讨气候对古湖演化的影响,而不是构造和火山作用的影响。这种重建是利用矿物学和地球化学代用指标(元素和矿物学组成、总有机碳值、黄铁矿和菱铁矿的存在)进行的。根据研究结果,描述了 Wójcik-Tabol 等人(2021 年)之前提出的三个化学性质不同的区间。它们分别代表了湖泊演化的以下阶段:横断(区间 I)、开放湖(区间 IIA 和 IIB)以及终止(区间 IIC 和 III)。湖泊的初始阶段(区间 I)可能与晚彭斯凡尼世湿度上升有关,与南冈瓦纳冰期有关。区间 IIA 代表了 Anthracosia 盆地最深的地层,湖底缺氧现象十分普遍。在这一阶段之后,IIB 区间记录了湖面逐渐下降的过程,并记录了潮湿和温暖的季节性。区间 IIC 代表了因干旱化而导致的湖泊逐步退缩,代用指标显示化学风化作用有所减弱。区间 III 中的浊砂岩层反映了湖泊填充的末期阶段。
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来源期刊
Geological Quarterly
Geological Quarterly 地学-地质学
CiteScore
2.20
自引率
0.00%
发文量
19
审稿时长
>12 weeks
期刊介绍: The policy of the Geological Quarterly is to publish significant contributions of information and geological insight relevant to an international readership. The journal has been issued since 1957 at the Polish Geological Institute - National Research Institute and, at present, is the leading Earth sciences journal in Poland. All aspects of Earth and related sciences, and universal and broad regional rather than locally oriented topics are covered. The journal is intended to be an international forum for the exchange of information and ideas, particularly on important geological topics of Central Europe.
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