Journal of South American Earth Sciences最新文献

{"title":"Main factors influencing the pore structure development of late mature organic-rich shales: A case study based on La Peña and Eagle Ford Formations, Sabinas Basin, NE Mexico","authors":"J. Ortiz-Treviño ,&nbsp;I. Flores-Vivián ,&nbsp;E. Padilla-Ortega ,&nbsp;L.F. Camacho-Ortegón ,&nbsp;G. Chávez-Cabello ,&nbsp;F. Núñez-Useche ,&nbsp;E. Chacón-Baca ,&nbsp;C.G. Aguilar-Madera","doi":"10.1016/j.jsames.2025.105880","DOIUrl":"10.1016/j.jsames.2025.105880","url":null,"abstract":"<div><div>The Aptian La Peña and the Cenomanian-Turonian Lower Member of the Eagle Ford Formations in the Sabinas Basin are organic-rich source rocks that represent unconventional petroleum resources in northeastern Mexico. In this study, we explore the formation and evolution of shale pores in these source rocks through a combination of mineralogy, geochemistry, organic petrography, scanning electron microscopy (SEM), and low-pressure nitrogen adsorption techniques. Results show that the samples are carbonate, quartz, and clay-rich. Geochemical and petrographic analyses indicate a post-oil and wet gas maturation stage, with limited petroleum generation potential. SEM imaging revealed that the more abundant pore types are intergranular, intragranular, intercrystalline, and dissolution pores. In addition, micropores, mesopores, and macropores are all present, with mesopores being the most dominant pore size (avg. 22.7 nm). Correlation analysis revealed that the microscopic pore structure of the shale samples is positively controlled by OM abundance and maturity, and negatively affected by clay minerals. These attributes are also controlled by the structural configuration on samples location, affected by regional folds, faults, areas of salt withdrawal and vicinity with igneous bodies in the Sabinas basin. Overall, the interaction of these factors conditioned the pore types, sizes, and morphology, affecting the gas content and network connectivity of these source rocks.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"170 ","pages":"Article 105880"},"PeriodicalIF":1.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694605","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}

{"title":"Magnetic mineral characteristics in lacustrine sediments from a climosequence in central Mexico","authors":"Beatriz Ortega -Guerrero ,&nbsp;Sandra García-León ,&nbsp;Arnaldo Hernández-Cardona ,&nbsp;Daisy Valera- Fernández ,&nbsp;Cecilia Caballero-Miranda ,&nbsp;Elizabeth Solleiro-Rebolledo","doi":"10.1016/j.jsames.2025.105866","DOIUrl":"10.1016/j.jsames.2025.105866","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Environmental magnetism methods were applied to surface lake sediments from seven basins located in a climosequence within the Transmexican Volcanic Belt and the Los Tuxtlas Volcanic Field in Central Mexico. The main aims are: 1) to determine the characteristics of magnetic mineralogy, 2) Evaluate the influence of climatic conditions and the geological age of source rocks on these characteristics. 3) Explore the relationship between magnetic mineral properties, climate and catchment age. 4) Integrate existing data from soil and paleosol profiles to provide a broader understanding of environmental and climatic controls on magnetic mineralogy. Results were compared to previous soil environmental magnetism analyses. Five end-members of magnetic components are recognized: 1) detrital partially oxidized Ti-magnetite, 2) pedogenic detrital magnetite, 3) authigenic magnetite formed from both biotic and abiotic processes, 4) detrital and 5) pedogenic hematite. The concentration of magnetic minerals and the distribution of grain sizes are closely linked to climatic regimes and hydrological dynamics. Lakes located in humid regions exhibit the highest concentration of magnetic mineral values, reflecting enhanced detrital input driven by rainfall-induced sediment flux. The observed differences between the magnetic parameters of soils and lacustrine sediments suggest that additional authigenic processes take place within the lakes, expanding the range of magnetic grain sizes and coercivities. This effect is particularly pronounced in warm and humid climates, where maghemitization and the mixing of detrital and authigenic components are more complex. Older basins (&gt;1 Ma) are enriched in fine-grained (SD and SP) pedogenic magnetite and hematite, indicating a substantial soil-derived contribution&lt;strong&gt;.&lt;/strong&gt;&lt;/div&gt;&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Abstract&lt;/h3&gt;&lt;div&gt;Métodos de magnetismo ambiental fueron aplicados a sedimentos superficiales de lagos de siete cuencas ubicadas en una clímosecuencia dentro de la Faja Volcánica Transmexicana y el Campo Volcánico de Los Tuxtlas en el centro de México. Los objetivos principales son: 1) determinar las características de la mineralogía magnética, 2) evaluar la influencia de las condiciones climáticas y la edad geológica de las rocas fuente en estas características. 3) explorar la relación entre las propiedades minerales magnéticas, el clima y la edad de la cuenca. 4) integrar datos existentes de perfiles de suelos y paleosuelos para proporcionar una comprensión más amplia de los controles ambientales y climáticos en la mineralogía magnética. Los resultados se compararon con análisis previos de magnetismo ambiental de suelos. Se reconocen cinco miembros finales de los componentes magnéticos: 1)Ti- magnetita detrítica parcialmente oxidada, 2) magnetita detrítica pedogénica, 3) magnetita autigénica formada a partir de procesos bióticos y abióticos, 4) hematita detrítica y 5) pedogénica. La concentración de minerales magnétic","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"169 ","pages":"Article 105866"},"PeriodicalIF":1.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145571566","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}

{"title":"Early craniides (Brachiopoda, Craniiformea) from the Tremadocian of NW Argentina (Central Andean basin)","authors":"Juan L. Benedetto,&nbsp;Fernando J. Lavié","doi":"10.1016/j.jsames.2025.105888","DOIUrl":"10.1016/j.jsames.2025.105888","url":null,"abstract":"<div><div>Only a few representatives of the Order Craniida have been described from the lower Paleozoic so that its early evolutionary history remains poorly understood. So far, the oldest known craniids are from the upper Tremadocian of the Bohemian Massif and Bavaria. Here, we describe new craniid material from siliciclastic rocks of the Coquena Formation exposed in the Cordillera Oriental of northwestern Argentina. The material consists of some well-preserved dorsal valves belonging to two different forms whose morphological features do not fit into any known genus, but available specimens are insufficient to formally erect new taxa. The fossil-bearing horizon has been confidently dated as early late Tremadocian (Tr2) based on conodonts of the <em>Paltodus deltifer</em> Zone and associated trilobites, making this the oldest record of the Craniida worldwide. This discovery supports previous hypothesis that the origin and early diversification of Craniida took place in the cold-water shelves of western Gondwana, then spreading to temperate waters (Baltica, Kazakhstan, Iran, Cuyania terrane) by the Mid Ordovician.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"169 ","pages":"Article 105888"},"PeriodicalIF":1.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145618111","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}

{"title":"Reconstructing coseismic subsidence and uplift from coastal stratigraphic sections in the Jalisco subduction zone, Mexico","authors":"Emmanuel Bustamante-Fernandez,&nbsp;Sarah Woodroffe,&nbsp;Jeremy M. Lloyd","doi":"10.1016/j.jsames.2025.105864","DOIUrl":"10.1016/j.jsames.2025.105864","url":null,"abstract":"<div><div>Stratigraphic sequences of coastal wetlands adjacent to active subduction zones permit us to reconstruct past earthquakes and tsunamis, estimate their recurrence intervals, spatial extent, and rupture characteristics, solving the limitations of short instrumental records. This study investigates the stratigraphy of the coastal wetland Estero Potrero Grande, located in the southern segment of the Jalisco subduction zone, in the Mexican Pacific. The stratigraphic sequences reveal eleven abrupt stratigraphic transitions interpreted as proxies for episodic submergence and emergence caused by coseismic land-level changes. Sedimentological and micropaleontological analyses reveal the coseismic origin of only six events, including four episodes of coseismic subsidence and two episodes of coseismic uplift, with half of these events accompanied by tsunami deposition. A Bayesian age-depth model, which integrates radiocarbon (¹⁴C) and cesium-137 (¹³⁷Cs) chronologies, dates these events to 1907–1950 CE, 862–987 CE, 694–796 CE, 679–735 CE, 291–442 CE, and 128–288 CE. Based on the geometry of the megathrust fault, coastal coseismic subsidence is typically associated with shallow earthquakes, with ruptures constrained within the upper portion of the seismogenic zone (&lt;30 km depth). In contrast, evidence of uplift reflects the occurrence of deeper ruptures that can be confined to the deepest portion of the seismogenic zone (up to 40 km depth). Additionally, our records reveal a rupture that very likely extended across the full width of the seismogenic zone, from its shallowest to deepest sections, causing a margin-wide event. These findings highlight the complexity of down-dip rupture segmentation pattenrs over Holocene time scales.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"169 ","pages":"Article 105864"},"PeriodicalIF":1.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145571565","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}

{"title":"Changes in stress revealed by seismic rate changes at El Chichón and Tacaná volcanoes, following the 8 September 2017, Mw8.2 Chiapas, Mexico, earthquake","authors":"D. Legrand ,&nbsp;M. Perton ,&nbsp;R. Campion ,&nbsp;L. Peiffer ,&nbsp;C. Valdés-González ,&nbsp;M. Alatorre-Ibargüengoitia","doi":"10.1016/j.jsames.2025.105862","DOIUrl":"10.1016/j.jsames.2025.105862","url":null,"abstract":"<div><div>In certain circumstances, such as the imminent eruption of a volcano, it has been suggested that \"large\" and \"near-field\" earthquakes have the capacity to \"accelerate\", \"clock-advance\", or \"trigger\" the eruption. In contrast, these earthquakes have no effect, or a minimal effect, on a volcano that is far from erupting. Changes in earthquake rates are frequently used as a stress-meter. In this study, we compared seismic activity beneath the two most active volcanoes in Chiapas, Mexico: El Chichón and Tacaná, before and after the September 8, 2017, M_w8.2 earthquake. This comparison can provide insight into volcanic stress changes and proximity (or not) to an eruption. At El Chichón, seismicity increased a few days after the 2017 earthquake and remained elevated for five weeks before returning to pre-earthquake levels. At Tacaná, seismicity increased 15 weeks after the 2017 earthquake and remained elevated for two weeks before returning to pre-earthquake levels. This timing difference may be related to the type of fluid involved in generating the swarms: water at El Chichón and magma at Tacaná. Although the presence of volcanic seismicity indicates that El Chichón and Tacaná are seismically active, minor changes in amplitude and duration following the 2017 earthquake suggest minimal stress changes at these volcanoes. This is consistent with the absence of eruptions in 2017–2018. Previous field observations identified zones of hydrothermal manifestations at both volcanoes. These zones coincide with the locations of hydrothermal seismicity that we identified.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"169 ","pages":"Article 105862"},"PeriodicalIF":1.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145521144","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}

{"title":"Magmatic evolution of Isluga volcano: Insights for the differences in sub-arc magmatic inputs and crustal contribution in the Central Andes of northern Chile","authors":"Benigno Godoy ,&nbsp;Monserrat Cascante ,&nbsp;Loreto Hernández Prat ,&nbsp;Osvaldo González-Maurel ,&nbsp;Inés Rodríguez ,&nbsp;Petrus le Roux ,&nbsp;Claudio Contreras ,&nbsp;Vicente Contreras-Higueras ,&nbsp;Scarlett Chanqueo ,&nbsp;Edmundo Polanco ,&nbsp;Jorge Clavero ,&nbsp;Angelo Castruccio","doi":"10.1016/j.jsames.2025.105836","DOIUrl":"10.1016/j.jsames.2025.105836","url":null,"abstract":"<div><div>Isluga is an active, fumarole-bearing volcano with erupted products, showing a homogeneous plagioclase + pyroxene + amphibole ± biotite ± Fe-Ti oxides mineralogical assemblage. These products are mainly high-K calc-alkaline trachy-andesite with subordinated trachy-dacite and andesite (56–65 wt% SiO₂), which exhibit decreasing FeO, MgO, CaO, Co, and Sr concentrations, and increasing K₂O and Rb concentrations with differentiation. Primitive mantle normalized-rare earth elements (REE) present light (L)-REE enriched - heavy (H)-REE depleted patterns, with Eu/Eu∗ ratios 0.7 to 1.0. Overall, ⁸⁷Sr/⁸⁶Sr ratios (0.7056–0.7059) vary slightly without correlation with differentiation but positive correlation with increasing Sr content (523–1007 ppm).</div><div>We proposed that the parental magmas of Isluga were generated from a sub-arc mantle-derived primary magma (⁸⁷Sr/⁸⁶Sr ∼0.704), which assimilated lower crustal material with fractional crystallization in a garnet-dominated environment (&gt;40 km depth), generating an Andean-type parental magma (⁸⁷Sr/⁸⁶Sr = 0.7055). Combination of Sr/Y, Gd/Dy, and Eu/Eu∗ ratios suggest that garnet became unstable during the ascent of the magmas towards a plagioclase-dominated evolution (&lt;35 km depth). Finally, a late stage of crystallization of amphibole + biotite + plagioclase in magmatic chambers located at shallow depths (&lt;18 km depth) is proposed.</div><div>When compared with other volcanoes of the Central Andes (e.g., Taapaca, Parinacota, and Tata Sabaya), Isluga shows a mantle-array trend, and lower radiogenic ⁸⁷Sr/⁸⁶Sr, and Sr/Y and Gd/Dy values. This implies a lesser extent of crustal contributions, both at lower and upper crustal levels, related to a regime of high rates of sub-arc mantle-derived mantle inputs for Isluga.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"169 ","pages":"Article 105836"},"PeriodicalIF":1.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145435608","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}

{"title":"Application of the hyperextended rift model to Campos Basin, offshore Brazil: Implications for tectonic evolution and hydrothermal processes","authors":"Rodrigo Alberti ,&nbsp;Emanuele Francesco La Terra ,&nbsp;Marcos Fetter ,&nbsp;Gilmar Bueno ,&nbsp;Sergio Fontes ,&nbsp;Renata Alvarenga ,&nbsp;Gerson José Salamoni Terra ,&nbsp;Almério Barros França ,&nbsp;Cosme Ferreira Ponte-Neto","doi":"10.1016/j.jsames.2025.105890","DOIUrl":"10.1016/j.jsames.2025.105890","url":null,"abstract":"<div><div>Recent development of rifted margins studies brings new concepts and changed the way that continental margins are interpreted. While several recent studies have applied hyperextension concepts to Campos Basin at margin scale, this study provides a detailed local-scale integration centered on the BM-C-33 exploratory block (Raia Manta and Raia Pintada fields), focusing on the link between crustal structure and hydrothermal processes. We apply the protracted rift model (stretching–thinning–hyperextension) to the southern Campos Basin, offshore Brazil, integrating 2D seismic interpretation and forward gravity modeling to investigate the structural evolution and its role in sustaining hydrothermal circulation during continental breakup. Three seismic-constrained gravity models reveal a coherent transition from stretching to thinning of the continental crust, characterized by a main low-angle detachment fault, pronounced crustal attenuation, and mantle uplift to depths shallower than 20 km. The position of this detachment was refined and placed slightly farther basinward than in previous regional interpretations, improving the correlation between crustal thinning and the BM-C-33 block. This sector represents the area of maximum crustal attenuation, where fault-controlled permeability, elevated geothermal gradients, and mantle-induced heat flow sustained a long-lived hydrothermal system. Petrographic evidence from well 3-REPF-15DA-RJS, including pervasive silicification, hydraulic breccias, saddle dolomite, quartz veining, and bitumen infill, confirms the diagenetic imprint of this tectono-thermal regime. These findings establish a link between crustal-scale architecture and reservoir-scale hydrothermal alteration, demonstrating that the hyperextended rift framework can explain both the margin-scale evolution and localized hydrothermal systems of the Campos Basin.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"169 ","pages":"Article 105890"},"PeriodicalIF":1.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145618120","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}

{"title":"Shallow subsurface structure of the late pleistocene sudoeste volcano using shear-wave velocity models from ambient seismic noise in the san quintín volcanic field, Baja California","authors":"Ismael Yarbuh ,&nbsp;Luis A. Yegres-Herrera ,&nbsp;Lenin Ávila-Barrientos ,&nbsp;Miguel A. Santa Rosa-Del Rio","doi":"10.1016/j.jsames.2025.105887","DOIUrl":"10.1016/j.jsames.2025.105887","url":null,"abstract":"<div><div>The San Quintín Volcanic Field (SQVF), located on the Baja California Peninsula, comprises a set of Quaternary monogenetic cones whose eruptive and structural evolution remains only partially constrained. This study focuses on the Late Pleistocene Sudoeste Volcano to investigate its shallow subsurface structure and evaluate how pre-existing crustal features influence magma ascent and conduit emplacement. Ambient seismic noise measurements were conducted along two orthogonal profiles across the Sudoeste cone. The Horizontal-to-Vertical Spectral Ratio (HVSR) method, combined with 1D inversion, was applied to derive shear-wave velocity (Vs) models. The results reveal a vertically coherent high-Vs anomaly (&gt;2700 m/s) extending from approximately 200 to 800 m depth, showing a consistent NW–SE elongation that aligns with adjacent cones Pescador 1 and 2. This structure is interpreted as a shallow, consolidated intrusive body, while lower Vs values (&lt;800 m/s) surrounding the anomaly likely correspond to unconsolidated volcanic deposits and saturated sediments. These observations support the presence of a structurally guided feeder system and highlight the role of pre-existing crustal discontinuities in controlling magma pathways. The well-preserved morphology of the Sudoeste cone, its structural alignment with nearby cones, and the interpreted intrusive body provide new constraints on magma ascent within an active plate boundary setting. This study demonstrates the effectiveness of HVSR-based shear-wave velocity models from ambient seismic noise for imaging shallow volcanic architecture and contributes valuable insights into the tectono-magmatic evolution of the SQVF.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"169 ","pages":"Article 105887"},"PeriodicalIF":1.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145618119","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}

{"title":"When the Salt Vanished: Unveiling evaporite record in the continental carbonate succession of Caatinga Formation (Early Cretaceous, Irece basin, northeastern Brazil)","authors":"Emiliano Castro de Oliveira ,&nbsp;Lucieth Cruz Vieira ,&nbsp;Gabriella Talamo Fontaneta ,&nbsp;Francisco Hilário Bezerra","doi":"10.1016/j.jsames.2025.105859","DOIUrl":"10.1016/j.jsames.2025.105859","url":null,"abstract":"<div><div>This study documents the first occurrence of vanished evaporites in the Caatinga Formation (Irecê Basin, NE Brazil), unveiling novel paleoenvironmental and diagenetic processes in a continental carbonate system. Stratigraphic and petrographic analyses reveal previously unrecognized textures, including teepee structures and collapse/solution breccias, alongside with gypsum and halite pseudomorphs. Three key outcrop areas (Verde, Jacaré, Salitre rivers) expose a sedimentary succession comprising: (1) basal muddy micrites with sediment infiltration, (2) brecciated mudstones/wackestones, (3) brecciated wackestones/packestones, (4) an unconsolidated pedogenic horizon and (5) a regionally extensive calcrete layer caps the succession. Overlying tufa deposits, previously linked to the Caatinga Formation, are reinterpreted as younger freshwater carbonates. These findings provide critical evidence for a evaporitic sedimentary system, that can be related to the last marine incursion in the region, during the Early Cretaceous. The study also demonstrates that continental carbonates can archive cryptic evaporitic histories, offering new insights into paleoenvironment evolution in evaporite-influenced successions.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"169 ","pages":"Article 105859"},"PeriodicalIF":1.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145521148","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}

{"title":"Spatiotemporal simulation and analysis of coastal floodplain in Pernambuco, northeast Brazil","authors":"Leonel Vitório Esteves ,&nbsp;Carlos Fabricio Assunção da Silva ,&nbsp;José Miguel Reichert ,&nbsp;Artur Paiva Coutinho","doi":"10.1016/j.jsames.2025.105863","DOIUrl":"10.1016/j.jsames.2025.105863","url":null,"abstract":"<div><div>Coastal areas in the state of Pernambuco in northeast Brazil have numerous records of floods that have worsened over the years, thus requiring hydrological studies to enhance decision-making in water resource management. This study analyzes simulations of the Sirinhaém River Basin (SRB) floodplain, in Pernambuco, under distinct land use conditions for the years 1992, 2002, 2012, and 2022, with return periods (RP) of 20, 50, and 100 years. Additionally, a scenario including the planned Barra de Guabiraba flood-control dam was simulated to evaluate its potential effectiveness in reducing peak discharges and flood extent within the basin. Intense rainfall equations were calculated using the disaggregation method, and the Curve Number (CN) was determined using the interpolation method. Hydrological modeling was performed using the HEC-HMS software, calibrated through the Nash-Sutcliffe Efficiency (NSE) method and Percent Bias (Pbias), while hydrodynamic modeling was conducted using HEC-RAS, with digital elevation models from the three-dimensional PE3d program. Calibration involved two stream gauges: Engenho Bento with an NSE of 0.556 and Pbias of 11.78 %, and Mato Grosso with an NSE of 0.607 and Pbias of −13.73 %. Across the basin, a total of 407 residences were identified as being at risk of flooding across the five studied municipalities. Changes in land use and land cover are contributing to increased flow rates and that the river basin requires the implementation of flood control dams, as occurrences are already reported for return periods above 20 years.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"169 ","pages":"Article 105863"},"PeriodicalIF":1.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145521110","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}