Journal of South American Earth Sciences最新文献

{"title":"Retraction status of “Glaciar Norte” of Pico de Orizaba, Mexico: Update to 2024","authors":"Víctor Soto ,&nbsp;Carlos M. Welsh-Rodriguez ,&nbsp;Rafael Torres-Orozco ,&nbsp;Francisco Cordoba-Montiel ,&nbsp;Hugo Delgado-Granados","doi":"10.1016/j.jsames.2024.105267","DOIUrl":"10.1016/j.jsames.2024.105267","url":null,"abstract":"<div><div>Given that the “Glaciar Norte” of Pico de Orizaba is one of the last glaciers in Mexico and the only ones located at 19° north latitude in the world, it is crucial to observe its retreat and eventual disappearance to document its spatio-temporal evolution and to identify the factors that drive these changes. We update here the glacier ice areal extent up to May 2024, resulting an area of 0.37 km² and a glacier front altitude of 5130 m asl. The air temperature at the lower part of the ice body and within its accumulation zone has increased steadily, whilst precipitation has decreased during the months when solid precipitation commonly occurs in the country. Furthermore, since 2019, portions of the bedrock in the accumulation zone of the glacier have been exposed to solar radiation, resulting in the accumulation of energy. The temperature values obtained on the bare rock surface indicate that, from a thermodynamic perspective, the stored energy is causing the melting of the adjacent ice and snow through due to heat emission. This leads to the conclusion that, in addition to the retreat of the glacier front, ice melting is also occurring in what should be the solid precipitation accumulation area, resulting in an overall more pronounced retreat. The results obtained complement and update the monitoring work that has been carried out before, while also maintaining surveillance for the duration of the glacier's remaining lifespan.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"151 ","pages":"Article 105267"},"PeriodicalIF":1.7,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704212","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":"Coseismic geodetic and geophysical variations detected for the January 19th, 2021 San Juan earthquake. Tectonic implications","authors":"Gemma Acosta ,&nbsp;Marcos A. Sánchez ,&nbsp;Francisco Ruiz ,&nbsp;Federico Carballo ,&nbsp;M. Flavia Leiva","doi":"10.1016/j.jsames.2024.105262","DOIUrl":"10.1016/j.jsames.2024.105262","url":null,"abstract":"<div><div>The coseismic surface variations and crustal deformation in the Central Precordillera region of San Juan (Argentina) as a consequence of the Mw 6.5 earthquake of January 19th, 2021 (2:46 UTC) were characterized by a multidisciplinary team, integrating information from Gravity, Seismology, GNSS and DInSAR (Synthetic Aperture Radar Differential Interferometry) techniques.</div><div>Prior to the occurrence of the event, several periodic measures were taken at fixed reference points throughout San Juan province. The results of the data analysis show significant changes in height corresponding to the uplifting of a few centimeters of the hanging wall block in accordance with the estimated deformation obtained by the focal mechanism. In addition, the transcurrent component is evident in the GNSS vectors calculated after the earthquake. These results are consistent with the Gravity variations measured at the control points. This indicates the uplifting of the basement of Central Precordillera while the elastic Andean compressional deformation migrates N-E related to the Tulum lineament. The joint analysis of 4D gravity with GNSS heights shows an accumulation of deformation involving the lower crust prior to the earthquake, and the release of stresses with permanent deformation, which partially complies with the laws of isostasy in the Precordillera, after the earthquake.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"151 ","pages":"Article 105262"},"PeriodicalIF":1.7,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142703637","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 fracture-volcanism pattern: gravity and magnetic characterization of the Early Jurassic pull-apart structure in the Western Northpatagonian Region, Argentina","authors":"Marcos E. Bahía ,&nbsp;Leonardo Benedini ,&nbsp;Daniel A. Gregori ,&nbsp;Juan I. Gómez","doi":"10.1016/j.jsames.2024.105259","DOIUrl":"10.1016/j.jsames.2024.105259","url":null,"abstract":"<div><div>The Early Jurassic outcrops of the Río Negro Province provide a remarkable opportunity to evaluate the genetic significance of the potential anomalies related to the syn-rift structures. The Cañadón Chileno Complex pull-apart structure consists of two different areas, northern and southern, infilled with sedimentary and volcanic deposits. The residual gravity data indicate that the thicknesses vary significantly. The north area reaches 700 m, while the south has 500 m, which agrees with the on-site thicknesses. In addition, the 2D model indicates that the thicker sequence has a subcircular morphology coinciding with the ancient crater or diatreme structure location.</div><div>The gravity and magnetic data reveal an array of positive and negative anomalies, providing comprehensive insights into the intricate configuration of the pull-apart structures. A remarkable attribute of the gravimetric and magnetic methods is their ability to identify volcanic structure's position linked to the pull-apart extension. In this sense, we can confidently assert that these volcanic structures form at the intersection of the complex's internal faults (in horsetail faults) and the eastern boundary of the pull-apart (sinistral strike-slip fault). The results show that the combined gravity and magnetic methods offer a workflow useable for understanding the behavior of sedimentary and volcanic interaction inside the pull-apart structures.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"151 ","pages":"Article 105259"},"PeriodicalIF":1.7,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704210","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":"Mineralogy, geochemistry, geochronology, and fluid inclusion constraints of the Concepción del Oro-Mazapil Fe - Cu skarns, central Mexico","authors":"Luis Miguel Ramos-Prado ,&nbsp;Fernando Velasco-Tapia ,&nbsp;Augusto Antonio Rodríguez-Díaz ,&nbsp;Juan Alonso Ramírez-Fernández ,&nbsp;Carles Canet ,&nbsp;Reneé González-Guzmán ,&nbsp;José Carlos Castillejo-Carreón ,&nbsp;Cristina de Ignacio-San Jose ,&nbsp;Edith Fuentes-Guzmán ,&nbsp;Carlos Linares","doi":"10.1016/j.jsames.2024.105268","DOIUrl":"10.1016/j.jsames.2024.105268","url":null,"abstract":"<div><div>The Concepción del Oro – Mazapil mining District, Zacatecas, is considered one of the most important in Mexico because it contains massive Fe – Cu skarns mined for almost 500 years. Their origin has been related to post-orogenic granodioritic – monzodioritic intrusion (40–45 Ma) in the Mesozoic Zuloaga (Oxfordian) and Tamaulipas Inferior (Valanginian-Albian) limestones. In the present study, an updated paragenetic model is proposed for the Sol y Luna, Aranzazú and Cata Arroyo deposits. The hydrothermal system evolution has been explained applying a methodological scheme that included: (a) petrography, (b) electron microprobe analysis, (c) scanning electron microscopy, (d) whole-rock and zircon geochemistry, (e) U-Pb in zircon and K-Ar in annite geochronology, and (f) fluid inclusion analysis. A mineral assemblage (andradite &gt; grossular, diopside, wollastonite, vesuvianite, and quartz) and fluid inclusion analysis suggest a prograde stage with a general homogenization temperature = 373–514 °C and salinity = 10.5–61.7% NaCl eq. The Fe-Cu mineralization occurred during the retrograde stage (homogenization temperature = 201–321 °C, salinity = 4.0–10.9% NaCl eq.). It was constituted by magnetite &gt; hematite &gt; pyrite ≈ chalcopyrite &gt; bornite, accompanied by minor amounts of sphalerite, tetrahedrite, hessite, Bi-sulfosalts, covelline, goethite, and Mn oxides. An annite K-Ar age indicates that the iron deposit probably started at ∼41.3 Ma. Chemical composition of iron oxides from skarn deposits shows the interaction of fluid-rock during its precipitation. Retrograde alteration petrographic and chemical composition of hydrothermal chlorites from the Concepción del Oro-Mazapil skarns show the evolution of hydrothermal fluids and represent an exploration guide that can be used as a vector towards orebodies. Chlorite and sphalerite geothermometers indicate a retrograde stage for polymetallic deposit at 208–263 °C for Sol y Luna, 208–234 °C for Aranzazú, and at 181–215 °C for Cata Arroyo. The Concepción del Oro-Mazapil ore system shutdown was marked by low temperature hydrothermal event (homogenization temperature = 120–242 °C) and low salinity (1.7–6.2% NaCl eq.), represented by As-Sb and Au-Zn jasperoids. The proposed paragenetic model provides a better understanding of the Concepción del Oro-Mazapil skarn, being valuable information for future exploration/exploitation activities. Finally, a mineralogical and geochemical comparison of Fe-Cu (Sol y Luna) and Cu-Fe (Aranzazú and Cata Arroyo) skarns has been conducted.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"151 ","pages":"Article 105268"},"PeriodicalIF":1.7,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142703630","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 Borborema province (NE Brazil) Neoproterozoic magmatic arcs: A review of geochemical and isotopic data of granitic rocks","authors":"Lauro Cézar M. de Lira Santos ,&nbsp;Ticiano J. Saraiva dos Santos ,&nbsp;Fabrício de A. Caxito ,&nbsp;Elson P. Oliveira ,&nbsp;Mariana S. da Paixão","doi":"10.1016/j.jsames.2024.105265","DOIUrl":"10.1016/j.jsames.2024.105265","url":null,"abstract":"<div><div>The Borborema Province in NE Brazil is assumed to have been formed by Cryogenian-Ediacaran convergent events during the assembly of western Gondwana. Among the many geological markers of such episodes, the granitic record is widespread, representing the best testimony of the Brasiliano-Pan African Orogeny that took place between 800 and 500 Ma. Several granitic batholiths and stocks are interpreted as root remnants of arc edifices that grew during the consumption of large tracts of oceanic crust, such as the Goiás-Pharusian and Transordestino-Central África realms. Most of them share geochemical signatures that are typical for subduction-related magmas, such as enrichment in large-ion lithophile elements, aligned with depletion in high-field strength elements, including negative anomalies in Nb, Ta, P, and Ti, as well as systematic plots consistent with convergent-related settings in classical tectonic discrimination diagrams. The older record is represented by the Lagoa Caiçara unit (ca. 880-800 Ma) of the Santa Quitéria magmatic arc of the Northern Subprovince, interpreted as relics of an intra-oceanic setting, responsible for lithospheric growth in the region. A subsequent magmatic episode is marked by the injection ca. 650-620 Ma cordilleran and peraluminous magmas that formed a large set of batholiths and stocks in the Santa Quitéria and Conceição (Transversal Subprovince) magmatic arcs, as well those related to the Pernambuco-Alagoas Terrane and Sergipano Belt in the Southern Subprovince. Rocks crystallized in this age interval share similarities with those of the calc-alkalic and alkali-calcic series, interpreted to have been emplaced in the continental crust via upper mantle melting and subsequent crustal contamination. Finally, rocks aged between ca. 620-550 Ma are widespread and represent high-K, meta-to peraluminous and alkali-calcic precursor magmas, that also share geochemical similarities with S-type granites (crustal anatexis), being interpreted as syn-collisional with respect to the final assembly of Gondwana. The final framework of the Borborema Province is marked by extrusion tectonics that is materialized by the complex network of shear zones deforming the previous formed granites and injecting of non-subduction related melts. Although there is a lack of consensus regarding the assembly of the province during the Neoproterozoic, we suggest that accretionary-collisional events played a major role, as testified by the geochemical-isotopic signature of the arc-related granites, in addition to a number of structural, geophysical, and geological mapping data published in the recent years.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"151 ","pages":"Article 105265"},"PeriodicalIF":1.7,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142703647","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":"Quaternary deflection of the Macuma River as it crosses the actively growing Cutucú antiformal culmination in southeastern Ecuador","authors":"Pedro Reyes ,&nbsp;Mauricio Valarezo ,&nbsp;Santiago Ramos ,&nbsp;Sandra Procel ,&nbsp;Elizabeth Lasluisa ,&nbsp;Ana Cabero ,&nbsp;Felipe Lima","doi":"10.1016/j.jsames.2024.105264","DOIUrl":"10.1016/j.jsames.2024.105264","url":null,"abstract":"<div><div>Models of fold growth involve simple mechanisms of tip propagation or an increase in amplitude and breadth by maintaining the tip fixed. Whatever the growth mechanism, the drainage network adapts to the newly created tectonic slopes. Lithological resistance to erosion, as well as climate and uplift rates, exerts a control on bedrock incision rates and, therefore, on whether a transverse river maintains its course or finally is deflected. In southeastern Ecuador, the northernmost end of the Cutucú Uplift corresponds to the Macuma anticline, a north-plunging periclinal fold that encroaches into the Amazonian plain. The east-flowing Macuma River exhibits a pronounced narrow curvature entrenched within the anticline structure. Morphometric analysis including river profiling, across-valley geometry, hypsometric-integral data, and small-scale saddle features such as wind gaps, evidence an antecedent east-flowing straight water gap in the initial stages of fold growth. Nevertheless, the gradual exposure of a rock-resistant core has deflected the Macuma River but only in its middle course while the general west-east trend is maintained. Consequently, the landscape resulted in a linked pair of elongated inner ridges bound by a horseshoe morphostructure. Through detailed geomorphic analysis, a complex history of lateral propagation has been established for the Macuma anticline. Thus, behind the frontal nose, an actively propagating core tip attained a point where it became fixed while the anticline began to grow in amplitude and breadth. Finally, a renewed phase of tip propagation encroached into the adjacent northern Amazonian plain and constructed a narrow anticlinal nose which is currently preserved as a pristine non-dissected surface.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"151 ","pages":"Article 105264"},"PeriodicalIF":1.7,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704215","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 Jurassic petrogenesis of the retro-arc volcanism of northwestern Patagonia, Argentina: Evidence from Lu-Hf isotopes and whole-rock geochemistry","authors":"Agustin J. Stremel ,&nbsp;Leonardo Benedini ,&nbsp;Daniel A. Gregori ,&nbsp;Mauro C. Geraldes ,&nbsp;Cecilia Pavón Pivetta ,&nbsp;Anderson Costa dos Santos","doi":"10.1016/j.jsames.2024.105256","DOIUrl":"10.1016/j.jsames.2024.105256","url":null,"abstract":"<div><div>Located in the north-western Patagonian Massif, the Loncón Complex offers insight into the Upper Sinemurian syn-rift phase of this Patagonian sector. New whole-rock geochemistry and zircon Lu–Hf isotopic data, combined with adjacent volcanic depocentres such as the Lonco Trapial Formation, the Cañadón Chileno Complex, the Cerro Piche Graben Formation, the Comallo Volcanic Sedimentary Complex as well as the Colomichicó Formation from the Neuquén syn-rift phase, allow us to constrain the tectonic characteristics and evolution of the Jurassic retro-arc system of Patagonia. The effusive and explosive volcanism registered by andesitic lava flows and dykes and rhyolitic pyroclastic deposits defines subalkaline and calc-alkaline series. Additionally, the eruptive rocks show significant enrichment in light rare-earth elements and large-ion lithophile elements, and lower La/Ta, Ba/Ta and higher Th/Ta than the effusive rocks. Both units show depletion in high field strength elements (e.g., Nb, Ta, Zr, and Hf), and relatively high Nb/U, Ta/U, moderate La/Yb and low Th/Ta and Sr/Y ratios. Negative and positive εHf zircon values (−4.8 to +4.1) reveal the rocks were derived from the partial melting of a metasomatised mantle, which underwent moderate crustal contamination during its emplacement. These I-type hybrid magmas are generated on an extensional tectonic setting, probably caused by the retreating of the orogen, during Sinemurian times. This intraplate extension is considered slightly before the Early Jurassic Chon Aike (V1) episode.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"151 ","pages":"Article 105256"},"PeriodicalIF":1.7,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704211","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 ‘snout’ of Morenelaphus reveals unexpected phylogenetic relationships with old world cervids","authors":"Alexis M. Aranciaga-Rolando ,&nbsp;Nicolás R. Chimento ,&nbsp;Julieta J. De Pasqua ,&nbsp;Santiago Miner","doi":"10.1016/j.jsames.2024.105257","DOIUrl":"10.1016/j.jsames.2024.105257","url":null,"abstract":"<div><div>The Cervidae family constitutes the second most diverse family of Artiodactyla, besides Bovidae. During the Pleistocene, the Cervidae appeared in South America, coming from North America, as part of the Great American Biotic Exchange. <em>Morenelaphus</em> is possibly the most conspicuous cervid from the South American Pleistocene, as it has been recorded in many localities in the Pampas and Mesopotamian regions of Argentina, Uruguay, Paraguay and eastern Brazil. However, all its records are based on antlers and associated cranial fragments. Given this problem, there are still numerous anatomical aspects to know about <em>Morenelaphus.</em> We describe the most complete snout of a fossil deer in South America, assigned to <em>Morenelaphus</em>, found in late Pleistocene layers of the Pampas Region. We Ct-scan the specimen to describe its external and internal anatomy, measure and compare it with other living deer. We performed a phylogenetic analysis using a recent data matrix and including <em>Morenelaphus</em> for the first time. The results allow us to recognize new diagnostic traits of <em>Morenelaphus</em> and clearly separate it from other South American deer. Additionally, the phylogenetic analysis recognizes <em>Morenelaphus</em> as a member of Cervinae, as some previous authors have suggested. Our analysis has paleobiogeographic implications, since the recognition of a Cervinae in the Pleistocene of South America would imply that two lineages of Cervidae entered South America in the Pleistocene: The Cervinae and the Capreolinae.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"151 ","pages":"Article 105257"},"PeriodicalIF":1.7,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142703634","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 first record of sedimentary macro-charcoal for the Upper Pleistocene of the Amazon","authors":"Karielly Aparecida Borges do Amaral ,&nbsp;José Rafael Wanderley Benício ,&nbsp;Kellen Lagares Ferreira Silva ,&nbsp;Júlia Siqueira Carniere ,&nbsp;Etiene Fabbrin Pires-Oliveira ,&nbsp;André Jasper","doi":"10.1016/j.jsames.2024.105258","DOIUrl":"10.1016/j.jsames.2024.105258","url":null,"abstract":"<div><div>Considered direct evidences of fire, macro-charcoal records in archeological contexts are common for the Amazon and reflect the human arriving in the area at the Pleistocene–Holocene boundary. However, the occurrence of sedimentary macro-charcoal is still rare and unclear in a non-anthropic scenario. This work presents the first record of paleowildfires in the Amazon, expanding paleoenvironmental knowledge about the Upper Pleistocene (∼43,000 years B.P.) paleoenvironments related to the Rio Madeira Formation, Abuña Basin, Rondônia state, Brazil. The samples were extracted from four (4) sedimentary blocks containing leaf compressions previously described for the studied locality. The material was submitted to the standard methods for macro-charcoal studies and charring was confirmed. Although the preserved anatomical features were non-diagnostic for taxonomical affinities (probably angiosperms), the presence of the records in Upper Pleistocene strata 30,000 years previously to the human presence, indicates that the paleowildfire ignition source and spreading was naturally supported by the paleoenvironmental conditions. This first record in the area and interval should serve as incentive to further efforts in the search for more Upper Pleistocene paleowildfire records in the Amazon.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"151 ","pages":"Article 105258"},"PeriodicalIF":1.7,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704213","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":"Estimation of potential groundwater recharge in a growing touristic neotropical dry forest area","authors":"Ballesteros-Buitrago Karen,&nbsp;Jaramillo Marcela,&nbsp;Vergara-Bechará Santiago,&nbsp;González-Jiménez Lauren","doi":"10.1016/j.jsames.2024.105261","DOIUrl":"10.1016/j.jsames.2024.105261","url":null,"abstract":"<div><div>La Tatacoa Desert, Colombia's second most arid area after La Guajira, is one of the country's main tropical dry forest ecosystems and most attractive natural tourist areas. However, due to its climatic and hydrological conditions, this region presents a worrying panorama on water resources since 90% of the streams crossing La Tatacoa dry up during summer, affecting the water supply for human consumption, agriculture, and livestock. Therefore, groundwater in the area is an invaluable resource that could help meet future demand, and identifying the primary source of recharge becomes an urgent matter. In this paper, we intend to approach the subject only from the analysis of direct recharge for the three main hydrologic conditions in the region: neutral, dry (el Niño), and humid (la Niña), considering the influence of the ENSO. For this purpose, potential recharge was estimated using the SWB (soil water balance) method suggested by the USGS (United States Geological Service). Our results showed that direct recharge for humid conditions is around 380 mm/yr. For neutral and dry conditions, it ranges between 115 mm/yr and 160 mm/yr, corresponding to a recharged precipitation of 10% and 15%, respectively. These values are similar to those reported for semiarid areas, even though rainfall in La Tatacoa ranges between 1000 and 1500 mm/yr. Such low values of direct recharge, compared with the reported use of groundwater in the area, might suggest that there is a complementary source of recharge, probably from the perennial rivers surrounding La Tatacoa (Magdalena or Cabrera), but this is something that is yet to be proven. This study enhances our understanding of groundwater recharge in arid regions, offering new insights for sustainable groundwater management. However, further studies are needed to assess the impact of climate change on direct recharge so that more sustainable water management can be implemented in La Tatacoa, especially concerning supply for the increasing touristic activities.</div></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"151 ","pages":"Article 105261"},"PeriodicalIF":1.7,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142703632","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}