Geosystems and Geoenvironment最新文献

{"title":"Analysis of methods used to validate remote sensing and GIS-based groundwater potential maps in the last two decades: A review","authors":"George Bennett","doi":"10.1016/j.geogeo.2023.100245","DOIUrl":"https://doi.org/10.1016/j.geogeo.2023.100245","url":null,"abstract":"<div><p>The integration of remote sensing data, machine learning and geographic information system in managing and analysing spatial data helps in generating maps showing groundwater potential. These maps are important tools for aiding stakeholders and decision-makers in groundwater resources to make informed decisions during groundwater development and management; to ensure the reliability of these maps, validation with the field data is conducted. This study analysed 125 scientific articles spanning the period from 2002 to 2023. The results show that around 85% of articles contain validated maps, indicating a significant number of researchers adhere to validate the remote sensing and GIS-based maps with field data, which is crucial in scientific research. However, 15% of articles contain non-validated maps. This is an alarming figure; therefore, journals should be strict in ensuring that validation is adhered to. In the reviewed articles, a total of 10 methods were used to validate groundwater potential maps using various parameters such as well yield, well/spring discharge rate, aquifer transmissivity, well specific capacity, and presence of wells/springs. This study will also add to the knowledge of selecting appropriate methods for validating remote sensing and GIS-based groundwater potential maps. The use of field data reflecting aquifer productivity is more appropriate for validation of groundwater potential maps.</p></div>","PeriodicalId":100582,"journal":{"name":"Geosystems and Geoenvironment","volume":"3 1","pages":"Article 100245"},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772883823000687/pdfft?md5=ee5242ea75043974ead13292bd2c0050&pid=1-s2.0-S2772883823000687-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138501545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of heavy metal contamination of sediments in popular tourist beaches of the Kerala State, southern India: Implications on textural and mineralogical affinities and mitigation","authors":"Mu. Ramkumar ,&nbsp;R. Nagarajan ,&nbsp;P. Athira ,&nbsp;Anupam Sharma ,&nbsp;P. Gopika ,&nbsp;AL Fathima ,&nbsp;G. Sugavanam ,&nbsp;A. Manobalaji ,&nbsp;R. Mohanraj","doi":"10.1016/j.geogeo.2023.100244","DOIUrl":"https://doi.org/10.1016/j.geogeo.2023.100244","url":null,"abstract":"<div><p>Beaches form one of the most contaminated sedimentary environments by a myriad variety of anthropogenic activities, including tourism and recreational activities. The concentrations of metals and their pollution levels were studied for four tropical tourist beaches in Kerala state, Southern India. Bulk geochemical and mineralogical analyses of 16 sediment samples were performed to determine the environmental status and the environmental risk level using various geochemical indices. Based on the enrichment of TiO₂ and SiO₂ concentrations, the samples were grouped into ilmenite-rich samples (IRS) and quartz-rich samples (QRS) respectively and the geochemical signatures are significantly different. Mineralogically, the IRS group is dominated by ilmenite, quartz, sillimanite, zircon and rutile while the QRS group consists of quartz, spinel and calcite and garnets are common in both groups of sediments. Despite the variation in the trends of pollution indices, it has been found that Kovalam beach sediments are enriched with W, Th and U where, IRS with enrichment of W, U and Th while QRS only enriched with W and Th and not U. The mineralogical affinity of W with secondary tungsten-bearing minerals has been documented by the XRD analysis and these metals are mainly controlled by the geogenic sourced minerals. However, in terms of ecological risk, Pb, As and Cu have a considerable to moderate risk in both groups of sediments. Overall, both group of sediments shows a moderate risk. Based on the biological effect assessment the elements of concern are Pb and Zn in IRS and possible effect by the Cr, Cu and As in IRS and only by Cu in QRS. Though the prevalence of geogenic and anthropogenic processes and influences of metal enrichments are documented by the study, their relative influences, mobility and bioavailability need to be systematically studied.</p></div>","PeriodicalId":100582,"journal":{"name":"Geosystems and Geoenvironment","volume":"3 1","pages":"Article 100244"},"PeriodicalIF":0.0,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772883823000675/pdfft?md5=ff6c252808e90eee93445620522471b8&pid=1-s2.0-S2772883823000675-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138501547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Scaling laws in the evolutionary processes of marine animals over the last 540 million years","authors":"Haitao Shang","doi":"10.1016/j.geogeo.2023.100242","DOIUrl":"https://doi.org/10.1016/j.geogeo.2023.100242","url":null,"abstract":"<div><p>Scaling laws are ubiquitous in modern biological systems. However, whether such patterns existed in deep-time biological systems is less investigated; the best-known example is the scaling law between the frequency and size of extinction events. Here, I show that the variation rates of biodiversity, origination intensity, extinction intensity, and body size of marine animals during the last 540 million years exhibited scaling laws. I then derive a general form of these scaling laws from a conceptual model with some principles of thermodynamics and assumptions about the global biological system. The results in this study suggest that the scaling laws systematically appearing in the biological metrics characterizing different aspects of the evolutionary processes of marine animals likely belong to the same universality class and probably derived from a set of common factors.</p></div>","PeriodicalId":100582,"journal":{"name":"Geosystems and Geoenvironment","volume":"3 1","pages":"Article 100242"},"PeriodicalIF":0.0,"publicationDate":"2023-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772883823000651/pdfft?md5=c501a5215a59e0275678914ee629aa9d&pid=1-s2.0-S2772883823000651-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138474560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Trans-Saharan seaway connection between the South Atlantic and the Tethys Sea during the Coniacian–Turonian: Evidence from bibliographical synthesis, field mapping, and seismic interpretation","authors":"L.M. Adamu ,&nbsp;N.G. Obaje ,&nbsp;J.A. Adeoye ,&nbsp;R.G. Oladimeji ,&nbsp;I. Yusuf","doi":"10.1016/j.geogeo.2023.100243","DOIUrl":"https://doi.org/10.1016/j.geogeo.2023.100243","url":null,"abstract":"<div><p>This paper presents an up-to-date review of Nigerian geological evolution during the Upper Cretaceous to treat with in-depth knowledge gathered from previous literature, field geological mapping and 2D seismic interpretation, the contentions concerning possible pathways of entrance throughout transgressive episodes that guide the initiation of the Trans-Saharan seaway. Assessment of the economic potency of this portion, inclusive of the petroleum system and coal (fossil fuel) deposits, groundwater, and mineral resources. Two episodes of transgression connected large number of Upper Cretaceous basins of Nigeria. The first Trans-Saharan seaway between the South Atlantic and the Tethys was confirmed during the Turonian time and started flooding southwards from the Cenomanian, of which the first transgression was entrenched in the Bida and Yola Sub-basins. The connection pathway was probably east and westward, linking Tethys with the Gulf of Guinea along the Benue Trough and Bida Basin. These resulted in extensive marginal marine conditions in the Campanian-Maastrichtian favored the deposition of coal, ironstone, and clay of great economic value. This connection was put to a standstill by the Santonian epeirogenic event (inversion, reversal, etc.) made distinctive by folding, faulting, uplift, and intrusions. A second transgression, beginning in the Campanian to Maastrichtian, re-confirmed the Trans-Saharan seaway through a westward Bida Basin path in the Maastrichtian, coming to a climax globally. Mainly marginal marine environments in Benin, Anambra, Sokoto, and Bida basins as established in this paper. The inundation of oceanic waters from the Tethys, restricted in expanse by the edified region of the southern Benue Trough brought about marginal marine conditions in the northern, central Benue Trough, and Chad Basin. Extensive deposition of clay, coal, ironstone. Also, good to prolific aquiferous units occurred during this time.</p></div>","PeriodicalId":100582,"journal":{"name":"Geosystems and Geoenvironment","volume":"3 1","pages":"Article 100243"},"PeriodicalIF":0.0,"publicationDate":"2023-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772883823000663/pdfft?md5=880314f932219dfa9df76b2d8426dc5f&pid=1-s2.0-S2772883823000663-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138467816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatial convergence and differentiation characteristics of ecological efficiency of forestry carbon sink: Evidence from China","authors":"Xiao Zhang ,&nbsp;Shunbo Yao","doi":"10.1016/j.geogeo.2023.100241","DOIUrl":"10.1016/j.geogeo.2023.100241","url":null,"abstract":"<div><p>Calculating and analyzing ecological efficiency of forestry carbon sink is key to develop China's forestry carbon sink effectively. This paper utilized super-efficiency stochastic frontier model (SBM) to measure ecological efficiency of forestry carbon sink of 30 provinces (municipalities and autonomous regions) in China from 2000 to 2017. In addition, this study calculated and analyzed convergence trend by constructing <em>β</em> convergence model under consideration of spatial conditions. Study results were revealed as follows. Firstly, ecological efficiency of China's forestry carbon sink presented a \"double peak\" distribution characteristic of a steady rise with fluctuations. However, overall level was not high, and large room still existed for improvement. Secondly, a significant spatial convergence existed in ecological efficiency of forestry carbon sink in China. Spatial factors had an accelerating effect on convergence trend, making spatial differences in ecological efficiency of forestry carbon sink among regions further narrowed over time. Thirdly, five major forest regions possessed significant spatial convergence, and convergence rates were higher than national average level. The southwest forest region had the highest convergence rate, followed by the northeast, south, northwest and the North China forest regions. Spatial convergence speeds of two periods from 2000 to 2010 and 2011 to 2017 were higher than classical convergence speed, and shown a decreasing change process. Due to existing of spatial convergence, different regions should explore value realization mechanism of forestry carbon sink, clarify regional positioning, and formulate measures based on local conditions to develop forestry carbon sink.</p></div>","PeriodicalId":100582,"journal":{"name":"Geosystems and Geoenvironment","volume":"3 1","pages":"Article 100241"},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S277288382300064X/pdfft?md5=180e06050360c25a3b11ec834a515d55&pid=1-s2.0-S277288382300064X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135566799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carboniferous-Permian sequences of the western margin of Sibumasu Block: Implications for new lithostratigraphic correlation in the eastern Highlands of Myanmar","authors":"Kyi Pyar Aung ,&nbsp;Kyi Khin ,&nbsp;Than Zaw ,&nbsp;Aung Moe","doi":"10.1016/j.geogeo.2023.100240","DOIUrl":"https://doi.org/10.1016/j.geogeo.2023.100240","url":null,"abstract":"<div><p>The Eastern Highlands of Myanmar are characterized by Precambrian to Mesozoic rock formations, with Carboniferous-Permian sequences prominently present in the Shan Scarp and Shan Plateau zones. These sequences are particularly concentrated in the western margin of the Sibumasu Block. Although Permian sequences are abundant in this region, they are complicated by geological faults. Consequently, a lithostratigraphic study was conducted to establish correlations across an extensive area spanning 1200 km from Mandalay City in the north to Kawthaung City in the south and 250 km wide, bordered by the Sagaing Fault to the west and Inle Lake to the east. The Permian sequences can be categorized into lower siliciclastic units and upper carbonate units. These siliciclastic units encompass the Mergui Group, locally referred to as the Lebyin Group, Mawchi Series, Taungnyo Group, and Mergui Group, as well as the Yinyaw Formation. Additionally, there is a carbonate unit known as the Moulmein Formation in the Thaton, Hpa-an, and Mawlamyine areas, and the Tenasserim Formation in the Myeik and Bokepyin areas within the Shan Scarp zone. In the late Lower Permian sequences, the Mwedaw Beds are exclusively found in the Linwe area. However, the Thitsipin Formation, which is an equivalent of the Moulmein Formation, and the Nwabangyi Formation are also exposed in the Shan Plateau zone. Lower Carboniferous sequences, such as the Loikaw Beds, are sporadically visible in the Loikaw area but are overlain by the Thitsipin Formation. This study elucidates the presence of a diamictite unit (Mergui Group) and its associated units (Yinyaw and Thitsipin/Moulmein Formations) in the geo-structurally complex zones of the Shan Plateau and Shan Scarp through lateral lithostratigraphic correlation, shedding light on the Carboniferous-Permian period at the western margin of the Sibumasu Block.</p></div>","PeriodicalId":100582,"journal":{"name":"Geosystems and Geoenvironment","volume":"3 1","pages":"Article 100240"},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772883823000638/pdfft?md5=7c94eb83a803e4d417c686d0d44f0830&pid=1-s2.0-S2772883823000638-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134655929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mapping and discrimination of the mineralization potential in granitoids from Banyo area (Adamawa, Cameroon), using Landsat 9 OLI, ASTER images and field observations","authors":"Safianou Ousmanou ,&nbsp;Fozing Eric Martial ,&nbsp;Tcheumenak Kouémo Jules ,&nbsp;Achu Megnemo Ludovic ,&nbsp;Kamgang Tchuifong Agnès Blandine ,&nbsp;Aman Sufinatu ,&nbsp;Rachid Mohamed ,&nbsp;Kwékam Maurice","doi":"10.1016/j.geogeo.2023.100239","DOIUrl":"https://doi.org/10.1016/j.geogeo.2023.100239","url":null,"abstract":"<div><p>The Banyo area is situated in the west Cameroon domain of the Central African Fold Belt. In this study, field data and remote sensing conventional mapping techniques including Red-Green-Blue (RGB) colour combination, principal component analysis (PCA), Crosta-PCA, Band Ratios (BR), Constrained Energy Minimization (CEM), Minimum Noise Fraction (MNF), Spectral Angle Mapper (SAM) classification and Linear Spectral Unmixing (LSU) algorithms were used to process Landsat 9 OLI and ASTER data in order to discriminate various rock units such as biotite-amphibole granites, hornblende-biotite orthogneiss and map associated mineral deposits (e.g., iron-oxide, hydroxyl and corundum minerals). In addition, it was found that RGB combination (743) of OLI bands, PCA of OLI bands (PC123), BR of OLI bands (4/2, 6/7, 6/5), BR of ASTER (4/2, 7/6, 8/9), Crosta-PCA of OLI bands, MNF (123) of OLI bands, SAM, and LSU techniques applied to ASTER bands ascertain potential locations of granitoids and gneisses bearing iron and hydroxyl minerals. On the other hand, this study also revealed that corundum deposits are detected by applying the CEM method to OLI band ratio 6/7 highlighting red tones and processing SAM classification algorithm both using laboratory reference spectra. Automatic (using PCI Geomatica line tool) and manual extractions of lineaments revealed three major trends (N-S, E-W, and WNW-ESE to NW-SE) and an accessory trend (NE-SW to ENE-WSW) that surround hydrothermally altered rocks recognized as containing iron oxide, hydroxyl, and corundum mineral deposits. In the field, these lineaments may group to the tree deformation phases. The D₁ phase (NW-SE); the D₂ phase (NE-SW to ENE-WSW) and the D₃ phase (N-S). Maximum Likelihood Calssification (MLC) and SAM classification methods showed to be more effective in discriminating rocks bearing Iron-oxide, hydroxyl and corundum minerals in the study area.</p><p>This result permits to confirm that, the combination of remote sensing (Landsat 9 OLI and ASTER data in this case) and field data constitute a useful tool for mineral exploration in the shear zone. However, the accuracy assessment was relied on comparing the different maps produced from Landsat 9 OLI and ASTER data with the ground truth sample points and also, with the earliest geological map of Banyo area. Thus, quantitatively the results were accurate at 99%.</p></div>","PeriodicalId":100582,"journal":{"name":"Geosystems and Geoenvironment","volume":"3 1","pages":"Article 100239"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772883823000626/pdfft?md5=d3110483e82081069a811c87d47755ef&pid=1-s2.0-S2772883823000626-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134655930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geochemical proxies: Paleoclimate or paleoenvironment?","authors":"Mats O. Molén","doi":"10.1016/j.geogeo.2023.100238","DOIUrl":"https://doi.org/10.1016/j.geogeo.2023.100238","url":null,"abstract":"<div><p>Complications of interpretations of geochemical proxies used for paleoclimatic constructions, including proxies which may be interpreted as evidence of former glaciations, are more fundamental than is commonly acknowledged. Recent advancements have shown a much larger variation in the geochemical data than expected, and there may be a connection to local geological environments and processes rather than paleoclimate. The data has often been overinterpreted in paleoclimatic models and studies, and more caution is justified when interpreting ancient climates from geochemical proxies. A broader range of reasons for geochemical variations, additional to climate (e.g., source and paleotransport which may help in discovering provenance), should be considered.</p><p>Isotopes of carbon, oxygen and strontium, weathering (CIA), ikaites and banded iron formations are reviewed and discussed. Cap carbonates are considered as evidence for warm climate and are commonly covering diamictites that have been interpreted to be glaciogenic, and these are therefore relevant and discussed.</p></div>","PeriodicalId":100582,"journal":{"name":"Geosystems and Geoenvironment","volume":"3 1","pages":"Article 100238"},"PeriodicalIF":0.0,"publicationDate":"2023-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772883823000614/pdfft?md5=5c44a2202119063dc455a70219947e4d&pid=1-s2.0-S2772883823000614-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92100740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Zircon U-Pb geochronology of the Chimpa volcano (Central Andes, Puna plateau, NW Argentina): Inferences on the temporal evolution of the magmatic system","authors":"E. Bustos,&nbsp;L. Bardelli,&nbsp;M. Arnosio,&nbsp;R.A. Becchio","doi":"10.1016/j.geogeo.2023.100237","DOIUrl":"https://doi.org/10.1016/j.geogeo.2023.100237","url":null,"abstract":"<div><p>We investigated the temporal evolution of the andesitic Chimpa volcano of the northern Puna plateau, Central Andes, situated at the geological boundary between the plateau and the Eastern Cordillera domains. The volcanic activity consisted in three constructive volcanic cycles (Basal, Cajon and Chimpa units) showing complex eruptive behaviors (ignimbrites, lava domes. block-and-ash flows, lava flows). We present new U-Pb analyses conducted on the zircon crystals from the Chimpa volcanic rocks. These analyses provide constraints on the magmatic/volcanic tempos and offer insights into the Th and U (and Th/U ratios) systematics of the analyzed zircon crystals. The results suggest a lifespan for volcanism ranging 7.5 to &lt;7.0 Ma, in concomitance with the regional steady-state magmatic phase separating the first two pulses of ignimbritic flare-up in the Altiplano-Puna Volcanic Complex. Moreover, the analyzed zircon crystals exhibit Th/U ratios (0.11–0.34) and Th (33–8860 ppm) and U (52–4258 ppm) that indicate magmatic crystallization from poorly evolved melts at high temperatures. Some discrepancies exist between the calculated zircon concordia age for the third volcanic phase (Chimpa Unit, ca. 7.35 ± 0.071 Ma) and that of the second cycle (Cajon Unit, 6.98 ± 0.057 Ma). We interpret these differences as stemming from the presence of zircon antecrysts in the final eruptive melts. Indeed, a true pre-eruptive event of zircon crystallization (i.e., formation of autocrysts) could not be proven by the existing dataset.</p><p>There is a geochronological affinity with some nearby volcanic rocks from the Puna plateau and the Eastern Cordillera domains, particularly considering the rhyolitic products of the Ramadas Volcanic Center and the andesitic to dacitic Almagro volcanic rocks. This highlights the complex behavior of the local magma plumbing system beneath this particular area, resulting in the emission of geochemically variegate volcanic rocks at similar times. This scenario suggests that the composition of the erupting melts are affected by the rheological behavior of the mid-upper-crustal MASH reservoir (the Altiplano-Puna Magmatic Body), which may either facilitate or impede the ascent of poorly evolved magmas derived from the deep crust towards the surface. From this point of view, the relative location of the volcanic centers relatively to the position of the geophysical anomaly may exert an important influence on the petrogenetic paths of magmas.</p></div>","PeriodicalId":100582,"journal":{"name":"Geosystems and Geoenvironment","volume":"3 1","pages":"Article 100237"},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772883823000602/pdfft?md5=413e67abaf914ff4768b2b6dd88d818c&pid=1-s2.0-S2772883823000602-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92100743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deep electrical structure over the Paleoproterozoic intracratonic Kaladgi rift basin in southwestern India imaged from magnetotelluric studies","authors":"Amit Kumar ,&nbsp;Danda Nagarjuna ,&nbsp;M. Santosh ,&nbsp;S.K. Begum ,&nbsp;C.K. Rao","doi":"10.1016/j.geogeo.2023.100236","DOIUrl":"https://doi.org/10.1016/j.geogeo.2023.100236","url":null,"abstract":"<div><p>The disintegration of the Columbia supercontinent during the late Paleoproterozoic generated major rift basins in the constituent continental fragments. The Kaladgi basin, located between the southern part of the Deccan volcanic province (DVP) and the northern part of the Dharwar craton, is a Columbia rift-related basin in southwestern India that preserves a complex history from initial fault-controlled mechanical subsidence during rifting, thermal subsidence along a collision zone, crustal thinning due to stretching and erosion associated with doming. The Paleoproterozoic basins worldwide show higher uranium concentration and many deposits are also established in the Purana basins of India. In the present study, the lithotectonic architecture of this basin using broadband magnetotelluric (∼320 Hz–3000 s) soundings in the western segment of the Kaladgi rift basin along two profiles. Two-dimensional (2-D) inversion of data using a 2-D nonlinear conjugate gradient algorithm along both profiles provides insights into the deeper structure of the basin. Our results reveal a thin sheet of Deccan volcanic, sedimentary successions belonging to the Badami and Bagalkot groups, and Proterozoic sediments from top to bottom beneath this basin. The crustal structure is highly heterogeneous and associated with deep-seated faults, and its thickness increases from the eastern Dharwar craton (∼30 km) to the western Dharwar craton (∼45 km). The crustal conductors are interpreted as mafic intrusions derived from the underplated basalts. The moderate conductive features may correspond to carbonate fluids trapped within the faults/fractures zone during basin initiation. The conductive features in the lower crust and the Moho are interpreted as fluids derived from underplated intrusions through plume impact. The NNW trending Chitradurga Suture Zone (CSZ) signature and the Bababudan-Nallur Shear (BNS) in the crust and upper mantle depth are imaged along both MT profiles. This study provides insights into the lithology and tectonic architecture of a long-lived rift basin involved in multiple tectonic events from the late Paleoproterozoic to the late Cretaceous.</p></div>","PeriodicalId":100582,"journal":{"name":"Geosystems and Geoenvironment","volume":"3 1","pages":"Article 100236"},"PeriodicalIF":0.0,"publicationDate":"2023-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772883823000596/pdfft?md5=8087f8a44b98f41548691b5972c37b87&pid=1-s2.0-S2772883823000596-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92100742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}