Journal of South American Earth Sciences最新文献

{"title":"Trilobites from the upper middle Cambrian (Miaolingian, Guzhangian) of the Sierra Los Ajos, northern Sonora, Mexico: Biostratigraphic and paleogeographic considerations","authors":"Francisco Javier Cuen-Romero ,&nbsp;José Alfredo Ochoa-Granillo ,&nbsp;Héctor Arturo Noriega-Ruiz ,&nbsp;M. Franco Tortello ,&nbsp;Rogelio Monreal ,&nbsp;Dustin David Ozua-Ibarra","doi":"10.1016/j.jsames.2024.105163","DOIUrl":"10.1016/j.jsames.2024.105163","url":null,"abstract":"<div><p>A Cambrian sedimentary sequence with a predominant lithology of limestone, sandy limestone, and quartzite pertaining to the Bolsa and Abrigo formations is exposed in the Sierra Los Ajos to the east of Cananea city (northeastern Sonora, Mexico). Two fossil assemblages from Guzhangian layers of the Abrigo Formation are described herein. The trilobites identified comprise <em>Tricrepicephalus texanus</em> (Shumard), <em>Crepicephalus</em> sp., <em>Coosia ariston</em> (Walcott), <em>Coosia</em> sp., <em>Cedaria</em> cf. <em>eurycheilos</em> Palmer, <em>Coosella</em> sp., <em>Llanoaspis modesta</em> Lochman, and <em>Llanoaspis</em>? sp., representing the <em>Cedaria</em> and <em>Crepicephalus</em> zones (Miaolingian, Guzhangian). The Cambrian rocks of northeastern Sonora (Sierra Los Ajos, El Tule, and Mesteñas hills), southern Arizona, and Texas, were deposited as part of a thick sedimentary sequence on the southwestern margin of Laurentia, associated with an inner shelf marine environment. The distribution of the trilobites identified confirms the existence of a widespread Cambrian faunal province that includes the southeastern United States of America and northwestern Mexico.</p></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"148 ","pages":"Article 105163"},"PeriodicalIF":1.7,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142272929","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":"Pre-Choiyoi volcanism at Cordillera del Viento, southwestern margin of Gondwana (∼37° S): Geological characterisation, geochronology and regional implications","authors":"Sebastián Dicaro ,&nbsp;M. Josefina Pons ,&nbsp;Santiago N. González ,&nbsp;Gerson A. Greco","doi":"10.1016/j.jsames.2024.105158","DOIUrl":"10.1016/j.jsames.2024.105158","url":null,"abstract":"<div><p>This contribution provides a comprehensive description and classification of fifteen lithofacies within the Carboniferous rocks attributed to the Arroyo del Torreón Formation and Sofía Dacite in order to understand the eruptive dynamics and the evolution of volcanism associated with the onset of the Gondwanan Orogenic Cycle at the Cordillera del Viento (Argentina). The outcrops of Carboniferous volcanic and volcaniclastic rocks linked to this cycle are restricted to the Cordilllera del Viento range. In consequence, they offer a valuable opportunity to research the volcanic arc products of the pre-Choiyoi magmatism.</p><p>The Arroyo del Torreón Formation lithofacies interpretation and its distribution indicate that the volcanism commenced with local andesitic lava flows followed by a volcano-sedimentary sequence formed by multiple pumice-rich quasi-steady concentrated pyroclastic density currents alternating with episodes of epiclastic sedimentation. The latter are covered ignimbrites developed by boiling over eruptions. Crystal-rich tuffs overlie the ignimbrites and represent a transition to a plinian eruption. This eruption style continued, developing concentrated pyroclastic density currents with highly unsteadiness conditions and scarce fall-out deposits. Conversely, the Sofía Dacite, represent a notable shift in the volcanism style, characterized by dacitic to rhyolitic lava flows with minor pyroclastic beds. Zircon dating of a pumice-rich lapilli-tuff from the Arroyo del Torreón Formation yielded a minimum age of 327.77 ± 1.79 Ma that was interpreted as the maximum depositional age for this unit. Similarly, zircons from a porphyritic dacite representing the Sofía Dacite provided a Concordia age of 329.11 ± 1.31 Ma that was interpreted as the crystallisation age of this rock.</p><p>Consequently, we propose a new stratigraphic division of the Arroyo del Torreón Formation into two members. The Cerro San Pedro Member will comprise the pyroclastic rocks at the base of the sequence, while the Sofía Member will include the upper lava-dominated portion of the unit. In this sense, the whole lithostratigraphic unit represents a distinctive Carboniferous basin associated with arc-related volcanism representative from the pre-Choiyoi magmatism.</p></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"148 ","pages":"Article 105158"},"PeriodicalIF":1.7,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142240179","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":"Structural evolution and exhumation events recorded in the Huingancó Granodiorite, Cordillera del Viento, Southern Central Andes, Argentina","authors":"Darío Leandro Orts ,&nbsp;Camila Delfina Aguilar Cáceres ,&nbsp;Sebastián Pernich ,&nbsp;Claudia Zaffarana ,&nbsp;Gloria Gallastegui ,&nbsp;Sebastián Assis","doi":"10.1016/j.jsames.2024.105166","DOIUrl":"10.1016/j.jsames.2024.105166","url":null,"abstract":"<div><p>This study seeks to unravel the exhumation history of Permian granodiorites corresponding to the Huingancó volcano-plutonic Complex in the southern sector of the Cordillera del Viento (∼37°S), located within the Chos Malal fold-thrust belt. In this context, mineral chemistry analyses were conducted on the granodiorites using electron microprobe data to infer the P-T conditions of emplacement, resulting in 700–900 °C and pressures ranging between 1 and 2.4 kbar. Employing a geostatic gradient of 3.7 km/kbar, these values give an estimate of emplacement depths between 4 and 9 km. In order to understand their exhumation path, five samples from the Huingancó Granodiorite were taken along the Huaraco creek on the western flank of the Cordillera del Viento anticline to perform apatite fission track (AFT) analysis. This analysis yielded new cooling ages for the study area ranging between 50 and 80 Ma. Furthermore, inverse thermal modeling using the fission track data revealed two significant exhumation events during the Andean cycle: one during the Late Cretaceous-Paleocene and the other in Miocene times, separated by a period of gradual cooling or stability during Eocene-Oligocene times. These important cooling events are associated with the main construction phases of the Cordillera del Viento. Finally, to characterize its deformation evolution, a structural kinematic model is proposed based on a balanced structural section and its reconstruction to its non-deformed pre-Cretaceous state. The resulting model allows us to identify the structures and mechanisms of uplift rising the Cordillera del Viento, and their association with the main exhumation events depicted in the inverse thermal modeling. The main structure of the Cordillera del Viento corresponds to a fault bending fold that involves the basement in the deformation. Subsequently, its insertion as an intracutaneous wedge is related with the development of the thin-skinned structures at the internal sector of the Chos Malal fold and thrust belt.</p></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"148 ","pages":"Article 105166"},"PeriodicalIF":1.7,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142272834","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 Early Carboniferous age of the Arrayán Formation in the Choapa Accretionary Complex: Implications for its fossil floral content, tectonic setting and evolution of the southwestern Gondwana margin (north-central Chile)","authors":"Reynaldo Charrier ,&nbsp;Francisco Hervé ,&nbsp;Marcia Muñoz-Gómez ,&nbsp;C. Mark Fanning ,&nbsp;Philippe Moisan ,&nbsp;Sofía Rebolledo ,&nbsp;Macarena Rojas del Castillo","doi":"10.1016/j.jsames.2024.105161","DOIUrl":"10.1016/j.jsames.2024.105161","url":null,"abstract":"&lt;div&gt;&lt;div&gt;The Arrayán Formation comprises a thick, well stratified, strongly folded turbiditic succession, exposed along the Chilean coast, between 31°30′ and 32°S. It is interpreted as the frontally accreted portion of the Choapa Accretionary Complex formed in the south western Gondwana margin in Carboniferus and Permian times. The Arrayán deposits are unconformably overlain by the marine neritic and richly fossiliferous late Early to early Late Permian Huentelauquén Formation. The contact with the basally accreted metamorphic units of the Choapa Accretionary Complex is tectonic. A previous and a recently dated sample from the Arrayán Formation (PS-8, this paper) yielded mid-Early Carboniferous (Visean) maximum depositional ages of 340 ± 5 Ma and 342 ± 4 Ma respectively. This age (i) contradicts the so far accepted Late Devonian to Early Carboniferous age assigned to the Arrayán Formation, based on its fossiliferous content, (ii) indicates that the age of the psylophytal remains found in this formation are post-Visean, (iii) confirms that the Arrayán Formation is younger than the mid-Early Carboniferous and older than the late Early to early Late Permian Huentelauquén Formation, and (iv) locates its stratigraphic position between the late Early Carboniferous and Early Permian. Previous dates from the compositionally similar metaturbiditic Agua Dulce Formation, which is exposed next to the Arrayán Formation and grades into a mélange, yielded a similar age, which indicates that deposition of both units was coeval. The maximum depositional ages of the Arrayán and the Agua Dulce formations are older than the maximum depositional ages obtained from the metamorphic units in the Choapa Accretionary Complex, which confirms that frontal accretion began earlier than basal accretion, and that the latter reached the Permian and was coeval with deposition of the Huentelauquén Formation. The stratigraphic position and the zircon age distribution pattern suggest that the El Toco, Sierra El Tigre and the Arrayán formations are correlative. The Las Tórtolas Formation is somewhat younger than these formations. The age distribution pattern of the zircon grains in sample PS-8 shows two well-defined age peaks at ∼340 (Visean) and ∼480 Ma (Ordovician) and a barren interval between them. The barren interval coincides partly with the Middle Ordovician to Late Carboniferous passive stage proposed for this region of Gondwana. The Ordovician peak is present in all analyzed samples, between 22° and 39°20′S, whereas the Visean peak and the barren interval are less developed in samples north of 27°S. This similarity indicates the existence of roughly similar sources of sediments along this large section of the western Gondwana margin and, possibly, a rather similar paleogeographic context and depositional environment in the trench. A peak younger than 300 Ma in the Llano de Chocolate Beds indicates a younger depositional age and a different paleogeographic setting in the act","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"148 ","pages":"Article 105161"},"PeriodicalIF":1.7,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142420365","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":"Upper Cretaceous Enchodontidae (Actinopterygii: Aulopiformes) in the La Luna formation, Eastern Cordillera, Colombia: A new report","authors":"José Manuel Torres-Parada ,&nbsp;Johanset Orihuela León ,&nbsp;Germán David Patarroyo Camargo ,&nbsp;Carlos Mario Alarcón Gómez ,&nbsp;Jefferson Steeven Diaz Villamizar ,&nbsp;Juan Sebastián Gómez-Coronado ,&nbsp;José Javier Márquez Prada","doi":"10.1016/j.jsames.2024.105160","DOIUrl":"10.1016/j.jsames.2024.105160","url":null,"abstract":"<div><p>The fossil record of Upper Cretaceous fishes in Colombia is particularly scarce, with only eleven previously identified species. This study presents the first comprehensive report of the extinct aulopiform fish family Enchodontidae from the Eastern Cordillera of Colombia. Fieldwork in the municipality of Matanza (Santander Department) yielded five fossil specimens, including jaw and skull fragments. These specimens were collected from the Upper Cretaceous La Luna Formation and were described and examined to approximate their taxonomic affinity, depositional environment, and geological age. Detailed morphological analyses associate these new specimens with the genus <em>Enchodus</em>. Our findings provide new data that contribute to the understanding of <em>Enchodus</em> diversity and distribution. The presence of key diagnostic characters in our specimens aligns with established phylogenetic frameworks, while further highlighting the potential for the presence of new species within this record.</p><p>Resumen</p><p>El registro fósil de peces del Cretácico Superior en Colombia es notablemente escaso, con solo once especies previamente identificadas. Este estudio presenta el primer registro de la familia de peces extintos Enchodontidae para la Cordillera Oriental de Colombia. El trabajo de campo en el municipio de Matanza (Departamento de Santander) produjo cinco especímenes fósiles, incluidos fragmentos de mandíbulas y cráneos. Estos especímenes fueron recolectados de la Formación La Luna del Cretácico Superior y analizados para establecer su afinidad taxonómica, ambiente de deposición y edad geológica. Los análisis morfológicos detallados asocian estos nuevos especímenes con el género <em>Enchodus</em>. Nuestros hallazgos aportan nuevos y valiosos datos que contribuyen a la comprensión de la diversidad y distribución de <em>Enchodus</em>. La presencia de caracteres diagnósticos clave en nuestros especímenes se alinea con las hipótesis filogenéticas establecidas, al tiempo que destaca el potential de nuevas especies dentro del registro aquí tratado.</p></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"148 ","pages":"Article 105160"},"PeriodicalIF":1.7,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142230394","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":"Characterization and processing of kaolin from southern Brazil for potential strategic application in the porcelain stoneware tiles manufacturing","authors":"André Biava Comin ,&nbsp;Alexandre Zaccaron ,&nbsp;Emily Saviatto ,&nbsp;Juliana Acordi ,&nbsp;Fabiano Raupp-Pereira ,&nbsp;João Carlos de Castro Abrantes ,&nbsp;Manuel Joaquim Ribeiro ,&nbsp;Guilherme Silva de Souza","doi":"10.1016/j.jsames.2024.105157","DOIUrl":"10.1016/j.jsames.2024.105157","url":null,"abstract":"<div><p>The ceramic industry in the productive hub of Santa Catarina needs some raw materials with specific characteristics such as kaolin to manufacture its products. This clay mineral with a naturally variable chemical composition in relation to its geolocation (in extraction area composed by rock and combined with sediment materials), attributes significant increases in transport costs due to its distance from the main productive areas in southern Brazil. Thus, as a strategic alternative, the improvement of kaolin with a high quartz content (69.9%) from the northern region of the state of Santa Catarina (∼400 km from ceramic hub in the south of the state), more precisely from the municipality of Garuva, was sought. Unit processing operations by classifying this mineral for suitability for use in industry, resulted in an increase in the concentration of kaolinite. The results indicated that the proposed method reduced the amount of quartz and consequently increased the kaolinite content, resulting in an aluminum oxide content of approximately 28.20%, a value higher than the normal natural content of ∼19%.</p></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"148 ","pages":"Article 105157"},"PeriodicalIF":1.7,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142230511","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":"Palynostratigraphy from the Allen and Jagüel formations at the Cerro Gutiérrez locality, Lago Pellegrini area, South Argentina","authors":"Egly Pérez Pincheira ,&nbsp;Alberto Carlos Garrido","doi":"10.1016/j.jsames.2024.105139","DOIUrl":"10.1016/j.jsames.2024.105139","url":null,"abstract":"<div><p>This work provides new stratigraphic information from the Allen and Jagüel formations (Neuquén Basin) at the Cerro Gutiérrez locality, Río Negro province. The distribution of palynomorphs allowed the definition of two palynologic assemblages: A1 corresponding to the Allen Formation, and A2 from the Jagüel Formation. The presence of taxa such as <em>Catinipollis geiseltalensis</em>, <em>Gabonisporis vigorouxii</em>, <em>Nevesisporites vallatus</em>, <em>Callialasporites</em>, <em>Gemmamonocolpites</em>, and <em>Quadraplanus brossus</em> suggests a Maastrichtian age. Due to the presence in A1 of <em>Quadraplanus brossus</em>, which range is Late Maastrichtian in Australia, New Zealand, and Antarctica, the age of the middle member of the Allen Formation, previously considered Late Campanian, could now be assigned to Late Maastrichtian. The palynoflora of the locality corresponds to the transitional paleoflora.</p></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"148 ","pages":"Article 105139"},"PeriodicalIF":1.7,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142272832","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":"Understanding the petrophysical properties, seismic responses and impacts of the basalt-sediment transition in prospective sedimentary basins","authors":"Natália Famelli ,&nbsp;John Millett ,&nbsp;Malcolm Hole ,&nbsp;Dougal A. Jerram ,&nbsp;Leonardo C. de Oliveira ,&nbsp;Evandro F. Lima ,&nbsp;Isabela de O. Carmo ,&nbsp;Sverre Planke ,&nbsp;Jessica H. Pugsley ,&nbsp;Magda Chmielewska ,&nbsp;John A. Howell ,&nbsp;David W. Jolley","doi":"10.1016/j.jsames.2024.105113","DOIUrl":"10.1016/j.jsames.2024.105113","url":null,"abstract":"","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"148 ","pages":"Article 105113"},"PeriodicalIF":1.7,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142323431","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":"Insights on the Mesoarchean to Neoproterozoic evolution of the western Campo do Meio Shear Belt, SE Brazil, using structural, aerogeophysical and U-Pb zircon data","authors":"Rafaela Machado Gengo ,&nbsp;Vinicius Hector Abud Louro ,&nbsp;Renato Moraes ,&nbsp;Gergely Andres Julio Szabó ,&nbsp;Elton Luiz Dantas ,&nbsp;Pedro Machado Simões","doi":"10.1016/j.jsames.2024.105150","DOIUrl":"10.1016/j.jsames.2024.105150","url":null,"abstract":"<div><p>The Campo do Meio Shear Belt (CMSB) is an approximately 200 × 25 km transcurrent area along the south-southwest margin of the São Francisco Craton. A comprehensive review of geology was performed in the western CMSB, where rocks from the Campos Gerais and Petúnia Complexes are predominant. The Campos Gerais Complex is relatively well positioned in the geotectonic context of the region. It corresponds to an Archean granite-greenstone belt lithological association related to the south-southwest part of the São Francisco Craton. The Petúnia Complex, in contrast, is unraveled in this contribution through the integration of aerogeophysical data from the western Campo do Meio Shear Belt (CMSB) with new fieldwork observations and zircon U–Pb (LA-MC-ICP-MS) dating.</p><p>The Petúnia Complex has been restricted to two Mesoarchean gneissic units – Petúnia and Ribeirão da Conquista Gneiss, with crystallization ages of 2993 ± 11 Ma and 2870 ± 9 Ma, respectively. Although the ages are broadly coincident with those found in the Campos Gerais Complex, three characteristics suggest an evolutionary independent scenario (pre-S2) during the Archean for the Petúnia and Campos Gerais Complexes: i) the sharp contrast in gamma-ray emissions between these complexes; ii) the absence of komatiite affiliation in the meta-ultramafic rocks from the Petúnia Complex; and, iii) the absence of mafic dykes in the Petúnia Complex. These two complexes also can be distinguished by the frequency of Paleoproterozoic granitoid intrusions. The Petúnia Complex has only one occurrence, the Bom Jesus da Penha Metagranite, with a crystallization age of 2004 ± 11 Ma. On the other hand, several Paleoproterozoic granitoid intrusions (2.0–1.9 Ga) have been found in the Campos Gerais Complex. These Orosirian granitoids are restricted to CMSB and younger than those in the Mineiro Belt. We suggest that these Orosirian granitoids may represent remnants of a collision event that occurred after 2.1 Ga, leading to the integration of the Petúnia and Campo Gerais Complexes into the Columbia paleocontinent. During the Neoproterozoic, the evolution in the CMSBinvolved the cratonic basement and units related to the Southernmost Brasília Orogen. This set configures a tectonic mélange that underwent progressive deformation in a non-coaxial, partitioned transpressional regime.</p></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"148 ","pages":"Article 105150"},"PeriodicalIF":1.7,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142272863","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 dynamics and transformation of the Parana State coastline: A 34-year analysis using RS, GIS, and machine learning","authors":"M.R Raja Ramesh ,&nbsp;Nageswara Rao Aramanda ,&nbsp;Nallabariki Praveen Kumar ,&nbsp;Phani Babu K ,&nbsp;Dammu Venkata Ravi Kumar","doi":"10.1016/j.jsames.2024.105162","DOIUrl":"10.1016/j.jsames.2024.105162","url":null,"abstract":"<div><p>The coastal zone is a critical and vibrant area within coastal cities. Analyzing the changes in the coastal zone of Parana State helps determine the spatiotemporal evolution patterns and driving forces of this region, providing guidance for resource protection and utilization. This study employs remote sensing (RS), Geographic Information System (GIS), and Machine Learning techniques, using Landsat data sets with eight distinct scenes from 1990 to 2024, to extract and analyze the coastline. Specifically, methodologies such as Shoreline Extraction, the Coastline Diversity Index (CDI), and the Coastline Utilization Index (CUI) were applied to assess the coastline's characteristics. The spatiotemporal characteristics of the coastline development in Parana are meticulously examined to ensure accuracy. The findings reveal that: 1) Over the past 34 years, the coastline of Parana State has shown a consistent increasing trend. Natural coastlines have been declining by 45% annually, while artificial coastlines have been increasing by approximately 55% annually. 2) The nature of the shoreline is transitioning from natural to sea-reclamation, engineering-enhanced, and degraded forest. 3) The coastline changes have occurred in three phases: The Built-up Land phase, the Port Petrochemical phase, and the Reducing Coastal Erosion phase. Significant shoreline extension is observed near both biological and ecological coasts. 4) The primary factors influencing the coastline alterations in Parana State include natural forces, human activities, and regional policies. These insights into the spatiotemporal dynamics of the Parana coastline can inform better coastal management and conservation strategies.</p></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"148 ","pages":"Article 105162"},"PeriodicalIF":1.7,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142240181","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}