Journal of South American Earth Sciences最新文献

{"title":"Leaching potential of heavy metals and metalloids in mining-impacted soils of central Mexico: Accelerated column tests and geochemical modeling","authors":"Luisa Fernanda Rueda-Garzón ,&nbsp;Alejandro Carrillo-Chávez ,&nbsp;Raúl Miranda-Avilés ,&nbsp;Maria Jesús Puy Alquiza ,&nbsp;Gabriela Zanor ,&nbsp;Margarita Ramírez-Ramírez ,&nbsp;Carolina Muñoz-Torres ,&nbsp;Pooja Kshirsagar ,&nbsp;Yanmei Li ,&nbsp;Xu Liao ,&nbsp;Daniela Kristell Calvo-Ramos","doi":"10.1016/j.jsames.2025.105414","DOIUrl":"10.1016/j.jsames.2025.105414","url":null,"abstract":"<div><div>The Guanajuato mining district has been hosting mining operations for over 500 years. It was one of the most important Ag-Au producers in Mexico. Due to the naturally high concentration of heavy metals and metalloids (HM&amp;Ms) and different mineral recovery methods employed over time, the region shows high levels of HM&amp;Ms in stream sediments and soil, representing a potential environmental risk. This study aims to assess the HM&amp;Ms concentration in soils and investigate the mobility and leaching potential of these in soils affected by mining activities in the Guanajuato River basin (GRB), using accelerated leaching column tests and geochemical modeling. The research employed X-ray diffraction and inductively coupled plasma optical emission spectroscopy for soil characterization and assessed the geochemical interactions using PHREEQC modeling. Soil samples exhibited Cu, Ni, Pb, and Zn levels exceeding the global soil averages, with contamination indices indicating moderate to significant contamination. Accelerated column leaching tests showed that soils in GRB have the potential to release Zn &gt; Cu &gt; Pb &gt; Ni in low concentrations (&lt;1 mg/L) due to the stability of mineral phases and alkaline pH. However, soil leachates can precipitate clays and oxyhydroxides, which, at alkaline conditions, enhance their retention capacity and control HM&amp;Ms leachability. These findings highlight the importance of soil mineralogy, pH, time, and environmental interactions in the mobility, transport, and fate of HM&amp;Ms within the basin. This understanding can inform strategies to reduce contaminant migration, mitigate environmental impacts, and guide practical remediation efforts in the basin.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"155 ","pages":"Article 105414"},"PeriodicalIF":1.7,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143429741","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":"Structure of the foothills of the Andes at the southern Chilean-Pampean flat subduction zone: The Cuyana Basin re-evaluated as a not-inverted basin","authors":"Andrea Aguilar ,&nbsp;Juan Pablo Milana ,&nbsp;Andrés Folguera","doi":"10.1016/j.jsames.2025.105402","DOIUrl":"10.1016/j.jsames.2025.105402","url":null,"abstract":"<div><div>The Cuyana Basin is amongst the most mature hydrocarbon-productive basins of South America. However, there is an ongoing discussion about how basin-forming mechanisms (Triassic-Jurassic) encroached with deformative mechanisms (Paleogene- Neogene) to create the hydrocarbon plays that are productive until now. To find better answers to this dilemma, an unprecedented detailed study describing the structure and distribution of the main depocenters of the Cuyana Basin was carried out. This basin is the main oil-producing Triassic rift basin in Argentina, and its subsidence relates to the break up of southern Gondwana, while the oil reservoirs were generated in association with Andean uplift at these latitudes. For this purpose, we have used 3D seismic, profiles and borehole data from all the different depocenters of this basin, located at the foothills of the Southern Central Andes between 33° and 34°S. From the correlation between bore-hole data and the different reflectors of the 3D seismic data, we disclosed a more complex structure of this rift basin than previously determined. The 3D seismic analysis also served to distinguish synrift geometries, sag, and synorogenic facies, determining the existence of only one synrift stage, and not two synrift stages as proposed previously. Additionally, we have found that the Cuyana Basin has a longer sag evolution than previously described, including the Barrancas Formation in this stage. This finding served to prolong the extensional period of this rift basin from the Early Triassic to the Late Jurassic, hence overlapping its evolution to other neighboring sub-Andean rift depocenters. Pre-Andean E-W structures have accommodated limited strike-slip displacements in the order of 2.5 km, previous to the uplift of the Frontal Cordillera, to the west. This basin is incorporated into the Andean deformational front from at least the latest Miocene to the Pliocene-Quaternary forming the Cerrilladas Pedemontanas Belt, in the low foothills. From this analysis, the NNW Neogene compressional structures are mostly decoupled from the Triassic-Jurassic extensional architecture, suggesting this is not an inverted basin. While we interpret that rifting was controlled by basement Early Paleozoic accretional structures, Neogene ones were not coinciding with them, a fact that we portrayed with our 3D analysis.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"155 ","pages":"Article 105402"},"PeriodicalIF":1.7,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420689","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":"A method for estimating the coverage of a seismic network: RESNOM","authors":"F. Alejandro Nava ,&nbsp;Lenin Ávila-Barrientos ,&nbsp;Luis Munguía ,&nbsp;Maria A. Núñez-Leal ,&nbsp;Francisco Farfán","doi":"10.1016/j.jsames.2025.105415","DOIUrl":"10.1016/j.jsames.2025.105415","url":null,"abstract":"<div><div>A new, simple, straightforward, and intuitive method for assessing the coverage of a seismic network, by estimating the minimum <em>measurable</em> magnitude, i.e., the magnitude corresponding to the smallest identifiable, and quantifiable signal, at any point of the region being monitored, is presented. The method takes advantage of the knowledge implicit in the magnitude determination scheme routinely used by the network, and uses the minimum measurable value of the parameter used at each seismic station to quantify the magnitude, which for different magnitudes may be maximum amplitude, duration, energy, etc. The method is illustrated by application to the RESNOM seismological network that monitors the seismically active region of north-western Baja California, Mexico, and uses synthetic Wood-Anderson seismograms to estimate <em>M</em>_<em>L</em> for small earthquakes. The results, besides identifying regions where more or better seismographic stations are needed, indicate that the observed groupings and gaps in the epicentral distribution are real features of the seismic processes in the region and not artifacts due to coverage.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"155 ","pages":"Article 105415"},"PeriodicalIF":1.7,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143421364","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":"The juxtaposition of thick-skinned structures and their role on the present-day configuration of the Frontal Cordillera of northern Chile","authors":"F. Martínez,&nbsp;C. Arriagada,&nbsp;L. Díaz,&nbsp;P. Reyes,&nbsp;M. Vergara,&nbsp;C. Schultz,&nbsp;C. Torres","doi":"10.1016/j.jsames.2025.105413","DOIUrl":"10.1016/j.jsames.2025.105413","url":null,"abstract":"<div><div>The Frontal Cordillera of northern Chile is a natural laboratory for studying thick-skinned tectonics related to Andean orogenesis. This region preserves a series of structural and stratigraphic elements associated with Triassic and Jurassic rifting and extension, which preceded Andean mountain building, as well as various structural styles associated with tectonic inversion and reverse faulting. In this contribution, we analyzed the Tatul and La Totora basins to reveal the juxtaposition of different thick-skinned structures exposed in the region and thus understand their impact on the configuration of the Frontal Cordillera, a significant thick-skinned fold-and-thrust belt established on the western slope of the Central Andes. This study was supported on multiscale field data, geological maps, and structural cross-sections. We documented three structural styles: (a) inherited and non-inverted Triassic to Jurassic normal faults, (b) partially inverted Triassic to Jurassic normal faults, and (c) large thick-skinned reverse faults. The presence of inversion structures supports the idea that Mesozoic extensional structural and stratigraphic frameworks played a critical role during Andean contraction. Many of these structures accommodated crustal shortening, enabling the upward expulsion of Triassic and Jurassic syn-rift strata from depocenters. The presence of normal and inversion structures in the hanging walls of large reverse faults is key to interpreting the complex 3D structure of the Frontal Cordillera, where structures with varying geometries and kinematics are juxtaposed. This configuration suggests that reverse faults cut through and passively translated the pre-existing normal and inverted faults, creating a complex structural setting. This interpretation challenges the previous paradigm that thick-skinned reverse faults cut through undeformed crust, highlighting the importance of understanding structural inheritance from pre-Andean tectonic extension.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"155 ","pages":"Article 105413"},"PeriodicalIF":1.7,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420687","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":"Recharge area estimation by block and mountain front for the Los Humeros Geothermal Field, Puebla, Mexico: Advancing the conceptual model","authors":"Thomas Gunter Kretzschmar ,&nbsp;José Alonso Aguilar-Ojeda ,&nbsp;Enrique Iñiguez ,&nbsp;Jorge Alejandro Ávila-Olivera ,&nbsp;Julio César Cañas-Ramírez ,&nbsp;Brenda Estela García-Sánchez ,&nbsp;Gabriela Michel Vara-Castro","doi":"10.1016/j.jsames.2025.105411","DOIUrl":"10.1016/j.jsames.2025.105411","url":null,"abstract":"<div><div>The Los Humeros Geothermal Field in Mexico is recognized as one of the most important in the country due to its geological conditions and electricity generation capacity. Therefore, this study aimed to provide new data for the conceptual model through remote analysis techniques, GIS tools, and hydrogeological exploration campaigns in the areas surrounding the geothermal field. The focus was on defining the area of the mountain front and the mountain block to estimate the potential recharge through these two components. It was determined that the potential recharge areas are located in the mountain fronts and mountain blocks of six subbasins surrounding the Los Humeros geothermal field, occupying an area of 5528 km². The estimated recharge of the mountain front and mountain block ranges between 199 and 3996 million cubic meters, depending on the infiltration rates considered (5% or 100% recharge). These estimates are similar to the recharge volume estimated by the Federal Electricity Commission. This scientific study provides new knowledge about the conceptual model of the Los Humeros geothermal field, specifically regarding the definition of recharge areas from mountain fronts and blocks. The findings contribute to a better understanding of recharge mechanisms in the geothermal field and have significant implications for the sustainable management of water resources in the area.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"155 ","pages":"Article 105411"},"PeriodicalIF":1.7,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420685","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":"A new terrestrial vertebrate from the Río Nío Formation (Eocene) of northwestern Argentina","authors":"Pablo J. Gaudioso ,&nbsp;Juan C. Fernicola ,&nbsp;Raúl I. Vezzosi ,&nbsp;C.D. Corro ,&nbsp;Claudia M. Muruaga","doi":"10.1016/j.jsames.2025.105410","DOIUrl":"10.1016/j.jsames.2025.105410","url":null,"abstract":"<div><div>Northwestern Argentina exhibits numerous Paleogene fossiliferous localities. However, in Tucuman Province, this period is represented by a few fossiliferous localities of the Rio Loro Formation (early Paleocene-early Eocene?). In this context, the Río Nío Formation (Eocene) is restricted to that province and no fossiliferous locality has been reported since its formal description in 1973. Recent geo-paleontological field trips in a new locality of the Río Nío Formation in Tucumán province, have revealed new fossil remains. Here we present the first fossil records from the Río Nío Formation, based on several disarticulated osteoderms of a cingulate mammal species, exclusive to northwestern Argentina, <em>Pucatherium parvum</em> (Xenarthra, Dasypodidae). This finding provides new morphological and biogeographical information for this taxon, increasing our current knowledge. The sedimentological analysis conducted at the new locality provides valuable paleoenvironmental and stratigraphic information on the Eocene and Miocene successions in this area.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"155 ","pages":"Article 105410"},"PeriodicalIF":1.7,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403281","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":"Provenance evolution and sedimentary records in a rift basin: U-Pb Detrital zircon and petrography of sandstones of the Volta Redonda Basin (central segment of the Continental Rift of Southeastern Brazil)","authors":"Carlos Eduardo Sales de Oliveira ,&nbsp;Luiz Carlos Bertolino ,&nbsp;Mauro Cesar Geraldes ,&nbsp;Renato Rodriguez Cabral Ramos ,&nbsp;André Pires Negrão ,&nbsp;André Campos Rocha Pinto","doi":"10.1016/j.jsames.2025.105407","DOIUrl":"10.1016/j.jsames.2025.105407","url":null,"abstract":"<div><div>This study traces the evolution of provenance, paleodrainages, and sedimentary records across the Paleogene tectonic stages of the Volta Redonda Basin (central segment of the Continental Rift of Southeastern Brazil) by integrating sandstone petrography, detrital zircon U-Pb geochronology, and field observations. The basin's evolution is recorded in three tectonostratigraphic units: pre-rift (Ribeirão dos Quatis Formation), which records a high-energy gravel-bed braided fluvial system; rift I (Resende Formation), deposited by an immature, sand-bed braided fluvial system with alluvial fans; rift II (Pinheiral Formation), featuring a mature braided fluvial system. U-Pb detrital zircon analyses reveal similar provenance for all units, with Neoproterozoic ages predominating (54–69%), followed by Paleoproterozoic (22–40%), Mesoproterozoic (1–14%), and minor Archean and Paleozoic contributions. Archean ages are linked to metasedimentary rocks of the Paraíba do Sul Group and orthogneisses of the Quirino and Campinho complexes. Paleoproterozoic ages are associated with orthogneisses of the Quirino, Campinho, Taquaral and Juiz de Fora complexes, and metasedimentary rocks of the Paraíba do Sul and Embu groups. Mesoproterozoic ages derive from the Embu Group. Neoproterozoic and Paleozoic ages are linked to intrusive granitoids, primarily the Rio Turvo Suite. Provenance reflects two main sediment dispersal routes: (1) from the inland side of the Bocaina Plateau, parallel to the rift axis, controlled by NE-SW-trending Precambrian basement structures, predominant during the pre-rift stage and active during the rift II stage; (2) from the Resende−Volta Redonda interbasin basement, transverse to oblique to the rift axis, controlled by NW-SE-trending transcurrent faults, predominant during rift I stage.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"155 ","pages":"Article 105407"},"PeriodicalIF":1.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403282","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":"The role of multiple disturbances in the morphodynamics of an alluvial fan in the north Patagonian Andean forests, Argentina","authors":"Agustín Quesada ,&nbsp;Mariano M. Amoroso","doi":"10.1016/j.jsames.2025.105409","DOIUrl":"10.1016/j.jsames.2025.105409","url":null,"abstract":"<div><div>Alluvial fans have the potential to record climatic and neotectonic events. These depositional systems, characterized by distributary river patterns, are more frequently studied in arid environments due to better exposure and easier accessibility. In this study, we applied dendrogeomorphic methods on an alluvial fan within the wet temperate north Patagonian Andean forests to reconstruct the environmental history of the Derrumbe Creek Alluvial Fan. The specific objectives were: (a) to date the activation/inactivation of different ecogeomorphic units in the alluvial fan, and (b) to interpret the relative importance of various disturbances that have shaped its recent history. The Derrumbe Creek Alluvial Fan is located in the southern bay of Puelo Lake, in the northwest of Chubut Province, Argentina. We carried out two fieldwork campaigns for tree data collection and geomorphic analysis. Using standard dendrochronological laboratory methods, we obtained establishment dates for the different geomorphic units of the alluvial fan and developed a disturbance chronology. Three main disturbance events were identified: the first in the early 1920s, clearly associated with a fire; the second between 1957 and 1959, linked to sediment deposition (colmatation) and lateral migration of the active channel; and the third between 1961 and 1963, related to an outburst flood and avulsion of the active channel. We propose that the latter two disturbance events were facilitated or conditioned by the earlier fire, emphasizing the significance of fire history in the geomorphic evolution of the alluvial fan. Our findings highlight the role of multiple disturbances in the complex dynamics of alluvial fans in the southern Andes.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"155 ","pages":"Article 105409"},"PeriodicalIF":1.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420688","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":"Soil development in a Maar lake basin in central Mexico based on micromorphology and magnetic mineralogy","authors":"Daisy Valera-Fernández ,&nbsp;Beatriz Ortega-Guerrero ,&nbsp;Elizabeth Solleiro-Rebolledo ,&nbsp;Arnaldo Hernández-Cardona ,&nbsp;Teresa Pi-Puig ,&nbsp;Cecilia Caballero-Miranda","doi":"10.1016/j.jsames.2025.105405","DOIUrl":"10.1016/j.jsames.2025.105405","url":null,"abstract":"<div><div>The weathering and diagenesis processes in the soils of a basin usually produce secondary minerals, which can be transported to the lake basins as part of the detrital fraction. The occurrence of magnetite in lake sediments, or the maghemitization of (Ti)-magnetites, may indicate pedogenic activity and weathering before transporting them to lakes. This study analyzes the differences in soil development in the Laguna de Majahual Maar Lake catchment soil profiles under a tropical-humid climate. Three soil profiles were sampled at different depths in the rim lake basin of Laguna de Majahual (MJ1, MJ2, and MJ3). Magnetic mineralogy and micromorphology analyses were completed, complemented by color, grain size, and mineralogy from the bulk sample and the clay fraction by X-ray diffraction (XRD). The basin's local topography variability influences the Laguna de Majahual soils' magnetic properties and degree of pedogenesis. The two soils in the upper part (MJ1 and MJ2) are formed mainly by the A, AB, and C horizons, suggesting several sedimentations and pedogenesis cycles. At the same time, the MJ3 profile close to the lake's surface shows well-developed Bt and Btg horizons. The micromorphology of the A and AB horizons of MJ1 and MJ2 showed abundant fresh plant fragments and a granular structure, while in the Bt and Btg horizons of MJ3, illuviation of clays and accumulation of Fe oxides was identified. The identification of clays in the MJ1, MJ2, and MJ3 horizons revealed the presence of halloysite. In the MJ1 and MJ2 horizons, this is likely due to hydrothermal alteration of volcanic materials. However, in the MJ3 horizon, halloysite formation is more likely the result of extensive leaching in soil profiles under tropical humid climates. Regarding their magnetic mineralogy, titanomagnetite (soft detrital minerals), and magnetite (soft pedogenic minerals) were found, whereas hematite (hard pedogenic mineral) was found exclusively in the MJ3 profile. It is now clearer that the contribution of titanomagnetite and magnetite in the MJ1 and MJ2 profiles is due to the incorporation of new volcanic material deposits, and hematite in the MJ3 profile related to pedogenic processes.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"154 ","pages":"Article 105405"},"PeriodicalIF":1.7,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143376708","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":"Coastal dynamics: Assessing erosion and progradation patterns in Campeche coastal region using machine learning techniques for geological insights","authors":"Palanikkumar D ,&nbsp;Eatedal Alabdulkreem ,&nbsp;Nuha Alruwais ,&nbsp;Abdulsamad Ebrahim Yahya","doi":"10.1016/j.jsames.2025.105406","DOIUrl":"10.1016/j.jsames.2025.105406","url":null,"abstract":"<div><div>This study examines shoreline dynamics along the Campeche coastal region from 1974 to 2024, using machine learning techniques to analyse long-term trends in erosion and accretion. Integration of machine learning with geological analysis enables precise evaluation of shoreline changes, enhancing the understanding of coastal dynamics. Spanning 50 years, the research utilizes satellite imagery, historical maps, remote sensing, and GIS to assess shoreline changes and their geological significance. Results show that 93% of the coastline is experiencing accretion, while 7% is undergoing erosion. Accretion rates range from a minimum of 2.36 m (0.05 m/year) to a maximum of 1136.61 m (22.73 m/year), while erosion rates vary from −2.56 m (−0.05 m/year) to −131.41 m (−2.63 m/year). This study identifies key coastal changes, with Zona Centra and Koben regions experiencing significant accretion, while South San Lorenzo faces the highest erosion activity. Understanding these dynamics is crucial for coastal management and mitigation strategies. Campeche's coastline predominantly features carbonate-rich sediment deposits, influenced by ocean currents, sediment supply, and coastal morphology, resulting in widespread accretion. Localized erosion hotspots are linked to human activities and disruptions in sediment transport. Machine learning models identified spatial patterns and quantified the influence of stratigraphy on shoreline changes, highlighting the benefits of combining modern techniques with traditional methods for accurate coastal analysis. Campeche's rich geological diversity and extensive data availability make it an ideal case study for exploring machine learning applications in coastal management and assessing coastal vulnerability. This comprehensive approach offers valuable insights for sustainable development and addressing coastal erosion challenges.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"155 ","pages":"Article 105406"},"PeriodicalIF":1.7,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403608","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}