Serra do Cipó-Brazil克拉通-造山带过渡时期的espinhaaldo超群:新编碎屑锆石U-Pb年龄的多重统计分析

IF 1.7 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Henrique Chaves Joncew , Ginaldo Ademar da Cruz Campanha
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引用次数: 0

摘要

南埃斯帕拉索山脉位于弗朗西斯科克拉通和Araçuaí造山带的交界处,是冈瓦纳西部一个重要的地质省。这项研究旨在改善其南部边界的地层模型,重点是巴西米纳斯吉拉斯州的塞拉做Cipó地区。通过建立全面的区域U-Pb碎屑锆石年龄数据库,结合新的LA-ICPM-MS年代学数据,建立了确定物源的统计模式,并提出了地层对比。使用核密度估算、Kolmogorov-Smirnov (KS)检验和多维尺度(MDS)分析碎屑锆石年龄数据,揭示了三个统计上不同的区域隶属关系组:pre- espinhao、espinhao和Macaúbas-Jequitaí。我们的研究结果表明,Serra do Cipó地区的pre-Bambuí硅屑岩与espinhao超群(特别是Santa Rita和Galho do Miguel组)密切相关,而不是与更年轻的Macaúbas组或前espinhao单元相关,从而可以重新评估该地区以前的地层模式。最年轻的锆石颗粒表明,最大沉积年龄为石花纪(1581±35 Ma, 1579±40 Ma),斯塔西纪(1613±47 Ma, 1656±26 Ma)和奥罗什纪(1831±26 Ma)。碎屑锆石年龄表明,沉积物源主要为新太古代至古元古代的克拉通源,中元古代的岩浆事件与espinhaarso盆地裂陷有关。有限的加里明期锆石颗粒提示远端沉积物来源。本研究完善了对espinhaarso超群分布及其在冈瓦纳西部构造-沉积史中的作用的认识,强调了对其南部边界进行修正地质填图的必要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Espinhaço Supergroup at the craton-orogen transition in Serra do Cipó-Brazil: Multi-statistical analyses of new and compiled detrital zircon U-Pb ages
The Southern Espinhaço Range, located at the boundary between the São Francisco Craton and the Araçuaí Orogen, is a key geological province in western Gondwana. This study aims to improve the stratigraphic models at its southern limits, focusing on the Serra do Cipó region in Minas Gerais, Brazil. By compiling a comprehensive regional U-Pb detrital zircon age database and integrating new LA-ICPM-MS geochronological data, we established statistical patterns to determine provenance and propose stratigraphic correlations. Detrital zircon age data were analysed using kernel density estimates, Kolmogorov-Smirnov (KS) tests, and Multidimensional Scaling (MDS), revealing three statistically distinct regional affiliation groups: pre-Espinhaço, Espinhaço and Macaúbas-Jequitaí. Our findings show that pre-Bambuí siliciclastic rocks in the Serra do Cipó region strongly correlate with the Espinhaço Supergroup, particularly the Santa Rita and Galho do Miguel formations, rather than the younger Macaúbas Group or pre-Espinhaço units, allowing a for re-evaluation of previous stratigraphic models in this area. The youngest zircon grains indicate maximum deposition of Calymmian (1581 ± 35 Ma, 1579 ± 40 Ma), Statherian (1613 ± 47 Ma, 1656 ± 26 Ma), and Orosirian (1831 ± 26 Ma) ages. Detrital zircon ages suggest that sediment provenance was dominated by Neoarchaean to Paleoproterozoic cratonic sources and Mesoproterozoic magmatic events related to Espinhaço Basin rifting. Limited Calymmian-age zircon grains suggest distal sediment sources. This study refines the understanding of the Espinhaço Supergroup distribution and its role in the tectono-sedimentary history of western Gondwana, emphasizing the need for revised geological mapping at its southern limits.
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来源期刊
Journal of South American Earth Sciences
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.
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