Taphonomic histories of Quaternary fossil accumulations preserved in Brazilian cave deposits

IF 1.7 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Journal of South American Earth Sciences Pub Date : 2024-09-19 DOI:10.1016/j.jsames.2024.105168

Lucas Henrique Medeiros da Silva Trifilio , Hermínio Ismael de Araújo Júnior , Kleberson de Oliveira Porpino

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Abstract

The taphonomic histories of five cave deposits in Brazil were interpreted, focusing on the accumulation and taphonomic modes. These caves, Complexo Suíço, F3, Toca das Onças, Lapa dos Peixes and Gruna das Três Cobras, show evidence of remains being accumulated through entrapping, sheltering, and water transportation. Cluster Analysis revealed a predominance of irregular breaks and low stages of weathering as the primary taphonomic mode, along with lack of corrosion and abrasion. Factor Analysis also indicated that incrustation played a major role in distinguishing between the deposits. The remains in F3, Toca das Onças, Lapa dos Peixes, and Gruna das Três Cobras caves experienced similar preservation conditions, including fragmentation from reworking, block collapses, exposure to acidified rainwater, incrustation and abrasion from water-borne sediments, and corrosion due to bat guano and acidified water.

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巴西洞穴沉积中保存的第四纪化石群的堆积史

对巴西五个洞穴沉积物的陶化史进行了解读，重点是堆积和陶化模式。这些洞穴（Complexo Suíço、F3、Toca das Onças、Lapa dos Peixes 和 Gruna das Três Cobras）显示了通过夹带、遮蔽和水运积累遗骸的证据。聚类分析显示，不规则断裂和低度风化是主要的岩石学模式，同时缺乏腐蚀和磨损。因子分析还表明，结壳在区分不同沉积物方面发挥了重要作用。F3、Toca das Onças、Lapa dos Peixes 和 Gruna das Três Cobras 洞穴中的遗骸经历了类似的保存条件，包括再加工造成的破碎、岩块坍塌、暴露于酸化雨水、水载沉积物造成的结壳和磨损，以及蝙蝠粪便和酸化水造成的腐蚀。

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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.