Journal of South American Earth Sciences最新文献

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Geochronology and stratigraphy of the Boa Vista de Minas Group: An example of a Meso-to Neoarchean greenstone-belt in amphibolite-to granulite-facies Boa Vista de Minas群的年代学和地层学:以角闪岩-麻粒岩相中新太古代绿岩带为例
IF 1.7 4区 地球科学
Journal of South American Earth Sciences Pub Date : 2025-02-28 DOI: 10.1016/j.jsames.2025.105459
Renato de Assis Barros , Renato Moraes , Marco Aurélio Piacentini Pinheiro , Ciro Duarte de Carvalho , Cristiano de Carvalho Lana
{"title":"Geochronology and stratigraphy of the Boa Vista de Minas Group: An example of a Meso-to Neoarchean greenstone-belt in amphibolite-to granulite-facies","authors":"Renato de Assis Barros ,&nbsp;Renato Moraes ,&nbsp;Marco Aurélio Piacentini Pinheiro ,&nbsp;Ciro Duarte de Carvalho ,&nbsp;Cristiano de Carvalho Lana","doi":"10.1016/j.jsames.2025.105459","DOIUrl":"10.1016/j.jsames.2025.105459","url":null,"abstract":"<div><div>The Boa Vista de Minas Group is a suite of metamorphic rocks ranging from amphibolite to granulite facies. It appears as disrupted, folded, and keel-shaped bands amidst the metagranite-migmatite domes of the Divinópolis Complex. It is challenging to define its lithostratigraphic architecture and thickness due to intense weathering and tectonic overprints. The internal organization of the complex is characterized by three main Formations. The basal level, known as the Nova Serrana Formation, primarily consists of amphibolites and mafic granulites (metabasites), meta-ultramafic rocks, cummingtonite schists, and cordierite-anthophyllite schists (immature volcanogenic metagraywackes). Zircon U-Pb analysis (LA-ICP-MS) from a sample of cordierite-anthophyllite schists from the Nova Serrana Formation yielded a maximum deposition age of <em>ca.</em> 2.82 Ga. Orthopyroxene-bearing iron formations and ferruginous meta-cherts define interbedded layers within the basal sections, collectively referred to as the Córrego do Cedro Formation. Above these units lies the Igaratinga Formation, which consists of calc-silicate rocks interspersed with lenses of amphibolites and granulites, sillimanite gneisses, and meta-ultramafic rocks, including common lenses of biotite-orthopyroxene granulite (immature volcanogenic metagraywackes). A sample of biotite- orthopyroxene granulite from this Formation provided a maximum deposition age of <em>ca.</em> 2.72 Ga (U-Pb, LA-ICP-MS). Additionally, zircon rims showing light luminescence and newly formed zircon yielded a Concordia age of approximately 2.0 Ga, interpreted as reflecting a high-grade metamorphic overprint. The patterns of LREE enrichment, Nb-Ta-Ti depletions, and variable Th/Nb ratios observed in the metabasic rocks of both the Nova Serrana and Igaratinga Formations are similar to those formed under interactions between LREE-enriched plumes and arcs. The similarities in lithology, lithogeochemistry, and depositional ages of the rocks in the Boa Vista de Minas Group suggest that it represents a high-grade counterpart to the Pitangui Greenstone Belt. This implies that the tectonic-thermal metamorphic event associated with the final stages of the Minas-Bahia Orogeny extended to the northern limit of the Divinópolis Complex and is more extensive than previously anticipated.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"157 ","pages":"Article 105459"},"PeriodicalIF":1.7,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143592432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Flow-type controls on tributary alluvial fan formation along the Andes (18-34°S) 沿安第斯山脉(18-34°S)支流冲积扇形成的流型控制
IF 1.7 4区 地球科学
Journal of South American Earth Sciences Pub Date : 2025-02-27 DOI: 10.1016/j.jsames.2025.105442
Albert Cabré , Germán Aguilar , Ferràn Colombo , José Luis Antinao , Diego Iturra
{"title":"Flow-type controls on tributary alluvial fan formation along the Andes (18-34°S)","authors":"Albert Cabré ,&nbsp;Germán Aguilar ,&nbsp;Ferràn Colombo ,&nbsp;José Luis Antinao ,&nbsp;Diego Iturra","doi":"10.1016/j.jsames.2025.105442","DOIUrl":"10.1016/j.jsames.2025.105442","url":null,"abstract":"<div><div>Debris flows, locally known as ‘<em>aluviones</em>’ or ‘<em>huaicos</em>’, in Andean tributary alluvial fans form distinctive facies associations that can be classified into High-density Flows (HdF) and Low-Density Flows (LdF) based on sediment-to-water ratios and transitions from highly dense, viscous flows to more diluted ones. This distinction, based on ground evidence and remotely sensed debris flow identification, establishes the first equivalence between field-based and optical satellite imagery observations using Google Earth. By analysing the activity of tributary alluvial fans over the past 20 years with open-access optical satellite imagery, we provide new insights into fan evolution and the extent to which lateral sediment inputs impact sediment transfer along axial river valleys of the Andes.</div><div>Our observations reveal that large-volume debris flows, typically associated with HdF, contribute to fan expansion and aggradation. In contrast, more diluted flows -ranging from hyperconcentrated to fluvial flows-promote fan destruction through incision of the feeder channel. Fans dominated by LdF facies associations often exhibit incision and progradation, forming new lobes at the fan toe. These lobes are frequently reworked by the main channel due to the limited sediment supply. Whether tributary fan sedimentation and progradation influence the main channel or if sediments are buffered on the fans largely depends on the characteristics of the flows and on the original topography of the fan. Accordingly, classifying debris flow surges into two distinct facies associations (AF1 and AF2, corresponding to HdF and LdF, respectively) enhances our understanding of fan dynamics and their influence on axial valleys at regional scale. This study underscores the importance of sedimentological flows characteristics in governing fan evolution, influencing both fan development across a broad latitudinal range (18-34°S) and sedimentary signal propagation along the Andes Cordillera. Moreover, the findings have significant implications for national debris flow hazard mitigation efforts and aligns with global strategies outlined in the Sendai Framework for Disaster Risk Reduction, promoting resilience and improved risk management in developing regions.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"156 ","pages":"Article 105442"},"PeriodicalIF":1.7,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Co-occurrence of Prolagostomus Ameghino and Chasicomys Pascual (Caviomorpha, Rodentia) from the late Neogene of the Northwestern Argentine Puna: biostratigraphic and palaeoenvironmental implications 阿根廷西北地区晚新近世Prolagostomus Ameghino和Chasicomys Pascual的共存:生物地层和古环境意义
IF 1.7 4区 地球科学
Journal of South American Earth Sciences Pub Date : 2025-02-27 DOI: 10.1016/j.jsames.2025.105455
Juan F. Escamilla , Silvina A. Contreras , Adriana M. Candela , Carlos A. Luna , Alfredo E. Zurita
{"title":"Co-occurrence of Prolagostomus Ameghino and Chasicomys Pascual (Caviomorpha, Rodentia) from the late Neogene of the Northwestern Argentine Puna: biostratigraphic and palaeoenvironmental implications","authors":"Juan F. Escamilla ,&nbsp;Silvina A. Contreras ,&nbsp;Adriana M. Candela ,&nbsp;Carlos A. Luna ,&nbsp;Alfredo E. Zurita","doi":"10.1016/j.jsames.2025.105455","DOIUrl":"10.1016/j.jsames.2025.105455","url":null,"abstract":"<div><div>Caviomorpha is a highly diversified clade among the Cenozoic South American mammals, notable for its extensive fossil record and ecological diversity. However, the evolutionary history of the Caviomorpha in the Andean and sub-Andean regions remains poorly understood. The recent discovery of fossils from the Calahoyo locality in the Puna Biogeographic Province (northern Jujuy, Argentina) has provided insights into this gap in our knowledge. The fossils include <em>Chasicomys</em> sp. (Octodontoidea) and <em>Prolagostomus</em> sp. (Chinchillidae) from the lower strata of an innominate unit underlying the Tafna Formation, which represent the northernmost record of these taxa in Argentina. This discovery is significant in that it represents the first documented co-occurrence of these two taxa. An absolute zircon dating of ca. 8 Ma from a tuff located 18 m above the fossiliferous level, in conjunction with biochronologic correlations, indicates a Late Miocene age for this level. This extends the known temporal range of <em>Prolagostomus</em> and enhances the significance of <em>Chasicomys</em> as a stratigraphic indicator for the Tortonian. The phytolith analysis indicates that the environments predominantly comprised grasses (Pooideae and Panicoideae) with herbaceous/woody dicotyledonous elements; with presence of palms in one area and non-phytolith elements such as diatoms and golden algae in the other. This suggests that there were varying moisture levels. These findings are of crucial importance for understanding the late Neogene evolution of the Puna ecosystem.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"157 ","pages":"Article 105455"},"PeriodicalIF":1.7,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143637763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Ichnology of osteoderms of the pampathere Holmesina occidentalis from the Late Pleistocene / Early Holocene Tablazo Formation, Santa Elena Peninsula, Ecuador 厄瓜多尔圣埃琳娜半岛晚更新世/全新世早期Tablazo组pampathere Holmesina occidental的骨皮技术
IF 1.7 4区 地球科学
Journal of South American Earth Sciences Pub Date : 2025-02-26 DOI: 10.1016/j.jsames.2025.105458
John-Paul Zonneveld
{"title":"Ichnology of osteoderms of the pampathere Holmesina occidentalis from the Late Pleistocene / Early Holocene Tablazo Formation, Santa Elena Peninsula, Ecuador","authors":"John-Paul Zonneveld","doi":"10.1016/j.jsames.2025.105458","DOIUrl":"10.1016/j.jsames.2025.105458","url":null,"abstract":"<div><div>The first evidence of parasite-induced and scavenger-produced bioerosion is reported from large cingulates from the Late Pleistocene Coralito fauna on the Santa Elena Peninsula of Ecuador. These traces occur on the external surface of osteoderms from the large pampathere <em>Holmesina occidentalis</em>. Traces observed include shallow to deep amorphous etchings, shallow ovoid to hemispherical pits of various sizes (<em>Karethraichnus lakkos</em>) deep, cylindrical pits (<em>K. kulindros</em>), shallow, horizontal, gently sinuous, grooves, straight, horizontal, smooth-walled, u-shaped to rounded v-shaped grooves (<em>Linichnus bromleyi</em>) and triangular to subrounded puncture-marks (<em>Nihilichnus nihilicus</em>). Both shallow and deep ovoid to hemispherical pits are attributable to parasitic arthropods, most likely tungid fleas and ticks. The shallow and deep amorphous etchings likely record corrosion by dipteran secretions and bacterial infections. The meandering grooves may record the activity of dermestid beetle larvae. The straight grooves are interpreted to record a variety of tooth and claw scrape marks. Traces attributed in invertebrates are interpreted to record the activity of parasites, whereas the scratchmarks may have been emplaced postmortem, likely by scavengers rather than predators. Overall, parasite loads on Coralito <em>H. occidentalis</em> appear to have been light, with evidence of only minor scavenging of their carcasses after their death.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"156 ","pages":"Article 105458"},"PeriodicalIF":1.7,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143520501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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 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
Journal of South American Earth Sciences Pub Date : 2025-02-26 DOI: 10.1016/j.jsames.2025.105422
Henrique Chaves Joncew , Ginaldo Ademar da Cruz Campanha
{"title":"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","authors":"Henrique Chaves Joncew ,&nbsp;Ginaldo Ademar da Cruz Campanha","doi":"10.1016/j.jsames.2025.105422","DOIUrl":"10.1016/j.jsames.2025.105422","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"157 ","pages":"Article 105422"},"PeriodicalIF":1.7,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Chemical attributes and fractionation of soil organic matter in integrated and conventional agricultural production systems in the Midwest, Brazil 巴西中西部综合和传统农业生产系统中土壤有机质的化学属性和分异
IF 1.7 4区 地球科学
Journal of South American Earth Sciences Pub Date : 2025-02-26 DOI: 10.1016/j.jsames.2025.105444
Paulo Guilherme da Silva Farias , Camila Beatriz da Silva Souza , Jolimar Schiavo , Jean Sérgio Rosset , Jefferson Matheus Barros Ozório , Naelmo de Souza Oliveira , Allan Motta Couto , Michely Tomazi , Júlio Cesar Salton
{"title":"Chemical attributes and fractionation of soil organic matter in integrated and conventional agricultural production systems in the Midwest, Brazil","authors":"Paulo Guilherme da Silva Farias ,&nbsp;Camila Beatriz da Silva Souza ,&nbsp;Jolimar Schiavo ,&nbsp;Jean Sérgio Rosset ,&nbsp;Jefferson Matheus Barros Ozório ,&nbsp;Naelmo de Souza Oliveira ,&nbsp;Allan Motta Couto ,&nbsp;Michely Tomazi ,&nbsp;Júlio Cesar Salton","doi":"10.1016/j.jsames.2025.105444","DOIUrl":"10.1016/j.jsames.2025.105444","url":null,"abstract":"<div><div>Replacing conventional management with conservation practices, like crop-livestock integration and agroforestry, can boost soil organic carbon. However, humic fractions are more sensitive to management changes. This study evaluated the impact of conventional and integrated systems on soil quality, focusing on fertility and organic carbon content in the Atlantic Forest biome. Samples were collected at depths of 0–5 cm and 5–10 cm, with 5 replicates per treatment, and each replicate consisting of 5 sub-replicates collected randomly. The analysis included soil organic carbon, chemical attributes of the soil, chemical fractionation, stocks of carbon in chemical fractions of soil organic matter, and variations in carbon stocks for each chemical fraction. The treatments evaluated were Agroforestry in the pasture phase; Agroforestry in the crops phase; Crop-livestock integration with pasture; Crop-livestock integration with crops; Cultivated Forest; Conventional tillage system; No-tillage system; Permanent pasture, and degraded pasture. The results obtained were analyzed for normality and homogeneity of the data using the Shapiro-Wilk and Bartlett tests, respectively. Subsequently, the data was subjected to analysis of variance using the F test, and the mean values were compared with each other using the Scott-Knott test, both at 95% confidence level in a completely randomized design. Lower pH values were found in the degraded pasture, reaching 3.8. The conventional tillage and no-tillage systems had higher phosphorus levels than the other evaluated systems. Agroforestry systems showed statistical differences based on the crops grown between the rows. The highest soil organic carbon contents at 0–5 cm depth were found in pasture and crop-livestock integration areas. There was a 28.7% increase in organic carbon in the agroforest with pasture compared to that with crops. The pasture phase of the agroforestry system exhibited positive variations in labile carbon fractions compared to the crop phase. Both crop-livestock integration and permanent pasture systems significantly improved the quality, content, and stock of the organic soil fraction, showing higher quality indexes than the other systems.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"157 ","pages":"Article 105444"},"PeriodicalIF":1.7,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A screening approach for selecting fossils for molecular analysis 一种选择化石进行分子分析的筛选方法
IF 1.7 4区 地球科学
Journal of South American Earth Sciences Pub Date : 2025-02-25 DOI: 10.1016/j.jsames.2025.105454
Damián A. Ibarra , Luciano Brambilla , Pablo Straccia , Rubén D. Scian , Lucas R. Brun
{"title":"A screening approach for selecting fossils for molecular analysis","authors":"Damián A. Ibarra ,&nbsp;Luciano Brambilla ,&nbsp;Pablo Straccia ,&nbsp;Rubén D. Scian ,&nbsp;Lucas R. Brun","doi":"10.1016/j.jsames.2025.105454","DOIUrl":"10.1016/j.jsames.2025.105454","url":null,"abstract":"<div><div>This study investigates the presence of preserved biological remains in fossils, which could be particularly critical for future studies aimed at understanding the evolutionary history of extinct organisms. We focused on osteoderms from specimens of glipotodonts <em>Panochthus tuberculatus</em> and <em>Glyptodon reticulatus</em> from the Late Pleistocene of Argentina. Our approach involved sectioning the osteoderms and staining them with Coomassie Blue, a dye with high affinity for proteins. Additional staining techniques included Hematoxylin and eosin (H&amp;E) and Masson's Trichrome Staining on histological sections of the same specimens. Sudan IV staining was also performed to verify the presence of lipids. These methods rapidly detected proteins and lipids and mapped their spatial distribution within the specimens, enabling the selection of samples for further molecular analyses. The findings highlight the potential of these methods to advance evolutionary research and improve our understanding of relationships among extinct species.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"156 ","pages":"Article 105454"},"PeriodicalIF":1.7,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A tide influenced braided delta in a flexural rift margin, the Mesoproterozic Lenheiro Sequence, São João del Rei basin, southern São Francisco Craton, Brazil 巴西<s:1> o jo<e:1> o del Rei盆地南部<s:1> o Francisco克拉通中元古代Lenheiro层序中受潮汐影响的弯曲裂谷边缘辫状三角洲
IF 1.7 4区 地球科学
Journal of South American Earth Sciences Pub Date : 2025-02-25 DOI: 10.1016/j.jsames.2025.105446
F. Nepomuceno , L.G. Arienti , A. Ribeiro , R.A.J. Trouw , G.L.C. Pires , T.F. Martins
{"title":"A tide influenced braided delta in a flexural rift margin, the Mesoproterozic Lenheiro Sequence, São João del Rei basin, southern São Francisco Craton, Brazil","authors":"F. Nepomuceno ,&nbsp;L.G. Arienti ,&nbsp;A. Ribeiro ,&nbsp;R.A.J. Trouw ,&nbsp;G.L.C. Pires ,&nbsp;T.F. Martins","doi":"10.1016/j.jsames.2025.105446","DOIUrl":"10.1016/j.jsames.2025.105446","url":null,"abstract":"<div><div>The Mesoproterozoic Tiradentes Formation incorporates three shallow marine sequences followed by a deltaic to fluvial sequence, the Lenheiro Sequence. Facies analysis, grain size, bed thickness and stacking patterns, along with paleoflow data reveal that the deltaic section of the Lenheiro Sequence includes seven facies associations distributed in two intervals. The lower interval is a ca. 20 m thick succession consisting of pelite and minor sandstone that comprises the facies association FA1. This facies association is interpreted as distal shoreface-offshore deposit in a retrogradational stacking pattern. The upper interval includes at least 160 m of pelite, sandstone, pebbly sandstone and minor conglomerate with a coarsening and thickening upward stacking pattern. Six facies associations (FA2 to FA7) were recognized: prodelta, distal and proximal delta front, distributary channels of the lower and upper delta plain, and abandoned braid-channel in the upper delta plain. Facies analysis allows interpretion of the succession as a tide influenced braid delta. Tide influence is weak in the distal delta front, increases in the upper delta front, decreases in the lower delta plain, and does not affect the upper delta plain. Paleoflow data indicate progradation towards south. Northward directed paleoflow records the flood tide that reworks deposits of the delta front. The distal shoreface-offshore facies association (FA1) of the Lenheiro Sequence covers abruptly and conformably the lagoon-tidal flat facies association of the underlying shallow marine sequence. The gap between facies associations records a rapid creation of accommodation space related to rift tectonics. The sharp boundary between the two sequences is a flooding surface that in turn is overlaid by a thin transgressive system tract (FA1) formed in response to the sudden generation of accommodation. The upper interval, interpreted as a tide influenced braided delta system (Lenheiro Delta), was developed as a highstand system tract in a period of relative tectonic quiescence. The data reveal that the studied interval is a syn-rift sequence located in a flexural margin of a Mesoproterozoic rift.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"156 ","pages":"Article 105446"},"PeriodicalIF":1.7,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Evaluation of Soil Water Index of distributed tank model in a small basin with field data 基于实测数据的小流域分布式水槽模型土壤水分指数评价
IF 1.7 4区 地球科学
Journal of South American Earth Sciences Pub Date : 2025-02-24 DOI: 10.1016/j.jsames.2025.105416
Sofia Melo Vasconcellos , Masato Kobiyama , Aline de Almeida Mota
{"title":"Evaluation of Soil Water Index of distributed tank model in a small basin with field data","authors":"Sofia Melo Vasconcellos ,&nbsp;Masato Kobiyama ,&nbsp;Aline de Almeida Mota","doi":"10.1016/j.jsames.2025.105416","DOIUrl":"10.1016/j.jsames.2025.105416","url":null,"abstract":"<div><div>The objective of the present study was to determine the spatial behaviour of the Soil Water Index (SWI) by applying a distributed version of the Tank Model (D-Tank Model) to the Araponga river basin (5.26 ha) in southern Brazil and to verify its reliability through the comparison to soil moisture estimated with the measured water-tension values and the water retention curve. The study area has a monitoring system for precipitation, discharge (5- min interval), and soil-water tension (10-min interval). The simulation results showed that the D-Tank Model has a reliable performance. The correlation between SWI and HAND was reasonable (r = 0.6) meanwhile that between SWI and the Topographic Wetness Index was high (r = 0.88). The comparison between the spatially distributed values of the SWI and soil moisture confirmed the high potential of the SWI derived from the D-Tank Model to be applied for predictions related to hydrological and environmental sciences. Keywords: D-Tank Model, Soil Water Index, Topographical Wetness Index, HAND, Soil Moisture.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"157 ","pages":"Article 105416"},"PeriodicalIF":1.7,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143561774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Corrigendum to ‘Long-term stability of sediment routing on an active continental margin: Insights from detrital zircon U-Pb ages and measured stratigraphy of Carboniferous to Miocene strata, Sierra de Narváez, NW Argentina’ [J. S. Am. Earth Sci. Volume 146, 15 October 2024, 105097] “活动大陆边缘沉积物路径的长期稳定性:来自碎屑锆石U-Pb年龄和阿根廷北部Sierra de Narváez石炭纪至中新世地层测量的启示”[J]。美国。地球科学。第146卷,2024年10月15日,105097]
IF 1.7 4区 地球科学
Journal of South American Earth Sciences Pub Date : 2025-02-24 DOI: 10.1016/j.jsames.2025.105443
Alexander Tye , Lindsay Schoenbohm
{"title":"Corrigendum to ‘Long-term stability of sediment routing on an active continental margin: Insights from detrital zircon U-Pb ages and measured stratigraphy of Carboniferous to Miocene strata, Sierra de Narváez, NW Argentina’ [J. S. Am. Earth Sci. Volume 146, 15 October 2024, 105097]","authors":"Alexander Tye ,&nbsp;Lindsay Schoenbohm","doi":"10.1016/j.jsames.2025.105443","DOIUrl":"10.1016/j.jsames.2025.105443","url":null,"abstract":"","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"156 ","pages":"Article 105443"},"PeriodicalIF":1.7,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143601281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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