Gondwana Research最新文献

{"title":"Ups and downs of the Guiana Shield and Amazon Basin over the last 500 Myr","authors":"Peter Japsen ,&nbsp;Paul F. Green ,&nbsp;Johan M. Bonow","doi":"10.1016/j.gr.2025.06.020","DOIUrl":"10.1016/j.gr.2025.06.020","url":null,"abstract":"<div><div>Cratons such as the Guiana Shield are often considered as stable regions, undergoing long-term emergence and denudation due to buoyancy. However, by integrating geological and geomorphological observations with apatite fission-track analysis, we define a history involving repeated episodes of burial and exhumation over the last 500 Myr. Over much of the shield, the thermal history is dominated by the effects of earliest Jurassic magmatism, followed by Early Cretaceous exhumation coincident with the onset of seafloor spreading in the southern South Atlantic. Further episodes of regional exhumation occurred in Aptian-Albian time coincident with a global-scale plate reorganisation and in Eocene times coincident with a slowdown in the movement of the South American plate. Results from the Amazon Basin also define these four episodes. Thermal data from a deep well in the Amazon Basin show that the Early Cretaceous and Eocene exhumation episodes were preceded by burial by kilometre-scale thicknesses of cover, subsequently removed. Continuity of data from basin to shield suggests that burial extended across the shield. Early Cretaceous exhumation led to formation of a base-Cretaceous peneplain across the entire continent, from the Andes (during post-orogenic collapse) to the Amazon Basin and the Guiana Shield. This peneplain was then buried beneath Cretaceous–Paleogene sediments (remnants of which are preserved in the Amazon well) prior to the onset of Eocene exhumation, which also extended into in the offshore Casiporé Basin (based on our results from a deep well). The Eocene episode also correlates with post-orogenic collapse of the Andes. The history of repeated burial and exhumation defined for the Guiana Shield appears to be a common property of supposedly stable cratons. The correlation between Andean tectonics, episodes of exhumation defined here and changes in the motion of the South American plate, shows that plate-tectonic changes governed the vertical movements across the continent.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"148 ","pages":"Pages 415-444"},"PeriodicalIF":7.2,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144988641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantile spillover connectedness among CO2 emission sources: An empirical analysis in European Union","authors":"Mubeen Abdur Rehman, Ugur Korkut Pata","doi":"10.1016/j.gr.2025.06.021","DOIUrl":"https://doi.org/10.1016/j.gr.2025.06.021","url":null,"abstract":"Environmental degradation from carbon dioxide (CO<ce:inf loc=\"post\">2</ce:inf>) emissions intensifies climate challenges, damages ecosystems, and threatens biodiversity. Addressing this concern, this study highlights the quantile connectedness among various sources of CO<ce:inf loc=\"post\">2</ce:inf> emissions: residential, power, transportation, industrial, domestic, and international aviation, focusing on how interconnectedness varies across different quantiles in the European Union (including the UK) from 1st January 2019 to 30th August 2024. The obtained spillover effects reveal a significant total connectedness within the system. Notably, domestic aviation is identified as the leading contributor of spillover shocks to all other sources, demonstrating its pervasive influence across the CO<ce:inf loc=\"post\">2</ce:inf> emission network. Furthermore, the transmission of return spillovers is more pronounced in the left and right tails of emissions from residential, transportation, industrial, and domestic aviation sectors, indicating increased interconnectedness during periods of extreme market events. The results specifically show that at lower quantiles, transportation (domestic aviation) serves as a contributor (receiver) of spillover shocks, while at the 90th quantile, domestic aviation becomes the sole contributor of shocks to all other variables, and they switch positions. These insights are crucial for policymakers, as they underline the need for targeted and flexible climate policies that take into account the varying roles of emission sources under different conditions of market volatility. Effective mitigation strategies should therefore take into account the dynamic nature of these interdependencies in order to achieve more resilient and sustainable emission reduction targets.","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"20 1","pages":""},"PeriodicalIF":6.1,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144664736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tectono-magmatic evolution of the Mongolian Collage with new evidence from the Ereendavaa Block","authors":"Munkhdelger Bold ,&nbsp;Tatsuki Tsujimori ,&nbsp;Daniel Pastor-Galán ,&nbsp;Tatsuro Adachi ,&nbsp;Nobuhiko Nakano ,&nbsp;Yasuhito Osanai","doi":"10.1016/j.gr.2025.06.023","DOIUrl":"10.1016/j.gr.2025.06.023","url":null,"abstract":"<div><div>The Central Asian Orogenic Belt, situated between the Siberian, Tarim, and North China cratons, contains three major collages, including the Mongolian Collage at its center. However, as part of the Mongolian Collage, the tectono-magmatic history of the Ereendavaa Block in northeastern Mongolia remains largely unknown. In this study, we present detailed zircon U–Pb geochronological and geochemical data from granitoids in the Ereendavaa Block, review existing data from other microcontinents within the Mongolian Collage, and integrate these findings to investigate its overall tectono-magmatic evolution. Our results reveal seven distinct magmatic episodes in the granitoids: Tonian (∼880 Ma), late Ediacaran (∼540 Ma), early Ordovician (∼470 Ma), early Silurian (∼440 Ma), late Triassic (∼220 Ma), early Jurassic (∼190 Ma), and middle Jurassic (∼170 Ma). In addition, we identify three magmatic events from inherited zircons within the granitoids. The geochemistry of these granitoids indicates a variety of tectonic settings, predominantly forming in continental extension and arc-related environments. The spatial distribution of coeval magmatic and metamorphic events from ∼880 Ma to ∼440 Ma, along with older magmatic stages in microcontinents of the Mongolian Collage, suggests that the Ereendavaa Block evolved in parallel with other microcontinents within the Mongolian Collage. This evolution likely began near the Siberian Craton earlier than ∼880 Ma and continued until slightly later than ∼440 Ma, when the microcontinents within the Mongolian Collage may have drifted away from the Siberian Craton. Late Triassic to Middle Jurassic granitoids constrain the timing of the Mongol-Okhotsk Ocean closure in the central segment of the Mongol-Okhotsk Belt. Coeval Late Triassic formations along the southern margin of the Mongol-Okhotsk Belt support a scissor-like closure model progressing from its central to eastern segments, thereby questioning the widely accepted notion of a Triassic closure in the western segment.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"147 ","pages":"Pages 276-300"},"PeriodicalIF":7.2,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144663409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cambrian provenance transition in the southeastern North China Craton and its tectonic implications: Detrital zircon U–Pb–Hf signatures from the Xuhuai region","authors":"Zhensheng Li ,&nbsp;Yu Zhang ,&nbsp;Mingzhen Tan ,&nbsp;Wei An ,&nbsp;Zhongwu Lan ,&nbsp;Xueting Ma ,&nbsp;Jiaodong Zhang","doi":"10.1016/j.gr.2025.06.012","DOIUrl":"10.1016/j.gr.2025.06.012","url":null,"abstract":"<div><div>The Cambrian tectonic stability and palaeogeography of the North China Craton (NCC) remain contentious. As the earliest site of Cambrian transgression, the southeastern NCC serves as an ideal location for investigating the geological evolution of the NCC. Provenance analysis through integrated field investigations, elemental geochemistry, and detrital zircon (DZ) U–Pb–Hf isotope analyses of Cambrian clastic sediments in the southeastern NCC reveals three distinct types of DZ age signatures and associated provenance changes, thereby enhancing our understanding of the Cambrian tectonics of the NCC and tracing its potential linkage to Gondwana. DZ age signatures are characterized as three types: (I) double peaks around 2510 and 1850 Ma, with mostly positive and negative <em>ε</em>_Hf(t) values, respectively; (II) minor peaks around 1450, 1150, and 950–750 Ma, alongside the double peaks, exhibiting predominantly positive <em>ε</em>_Hf(t) values; and (III) a scattered array of Mesoproterozoic to early Paleozoic zircons, with minor negative ε_Hf(t) values clustered at 476–518 and 909–1245 Ma. The contrasts between Series 2 Types I and II and the Wuliuan Type III sediments reflect a significant provenance change from the NCC Precambrian basement and/or cover to an exotic magmatic belt to the south, including the coeval Qinling arc. The comparable provenance shifts across the eastern NCC were diachronous during Stage 4 to Wuliuan, governed by transgression processes, Qinling arc-related orogeny, and paleogeographic configurations of alternating uplift and depression. The Cambrian evolution in the southeastern NCC was closely linked to an orogenic process resulting from Shangdan Ocean subduction, challenging the notion of passive tectonism in the NCC. The continental-scale DZ age signatures in the Cambrian unit support the view of the Cambrian NCC as a discrete continental block, paleogeographically separated from Gondwana-affinitive micro-continental blocks and the Gondwana landmass by the Proto-Tethys Ocean.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"147 ","pages":"Pages 233-259"},"PeriodicalIF":7.2,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144613216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nubia-Arabia separation: Clues from oceanic spreading fabric in the Red Sea","authors":"Neil C. Mitchell ,&nbsp;A.Y. Izzeldin ,&nbsp;Ian C.F. Stewart","doi":"10.1016/j.gr.2025.06.019","DOIUrl":"10.1016/j.gr.2025.06.019","url":null,"abstract":"<div><div>The breakup of the Arabian-Nubian (Ar-Nu) shield created the Red Sea rift, a young continental rift transitioning to an ocean basin. Different Ar-Nu plate reconstruction models have emerged, which complicate interpreting the shield geology, reconstructing motions of other plates and leave open the question of how much oceanic crust underlies parts of the sea. Uncertainty of plate reconstructions also affects how we interpret the dynamics of rifting in this basin from geophysical data. Helping to address this issue, gravity anomalies reveal an oceanic segmentation fabric that constrains the opening direction since ∼ 10 Ma or half the total Ar-Nu movement. We derive an Euler plate reconstruction pole from that fabric and apply it to restore the configuration of Ar-Nu shield structures at ∼ 10 Ma. With the Ar and Nu structures brought closer together, the reconstruction supports a new association of those structures across the Red Sea. That association in turn constrains the pre-breakup relative positions of the Ar-Nu shield fragments in a NW-SE sense (i.e., rift obliquity). It allows us to prioritise earlier-published total opening Euler poles that also bring these structures together. In particular, one of them was derived using the known Dead Sea Transform (DST) and Suez Rift motions, which constrain total Ar-Nu separation magnitude and direction. New Moho depth estimates further allow an assessment of how much distributed extension has left coastal units displaced relative to plate interiors. Applying the total-opening pole, and allowing for those coastal displacements, the pre-breakup shield terranes of the two sides are brought together but with significant gaps remaining between the two sides. The results support the views that the northern Red Sea is underlain largely by stretched continental crust and that the central Red Sea is underlain by both continental and oceanic crust.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"147 ","pages":"Pages 301-320"},"PeriodicalIF":7.2,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144613218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 missing arcs of the India-Asia collision","authors":"Alexis Licht ,&nbsp;Guillaume Dupont-Nivet ,&nbsp;Jan Westerweel ,&nbsp;Zaw Win ,&nbsp;Abel Guihou ,&nbsp;Pierre Deschamps ,&nbsp;Day Wa Aung","doi":"10.1016/j.gr.2025.06.018","DOIUrl":"10.1016/j.gr.2025.06.018","url":null,"abstract":"<div><div>Sedimentary provenance studies indicate a Paleocene age for the India-Asia collision, based on the arrival of allochthonous sediment onto the Indian shelf. To account for this age, geodynamic models propose either an extra-large pre-collisional India or an initial collision between India and a Trans-Tethyan Arc situated offshore of Asia. The Burma Terrane is one of the proposed remnants of this arc. However, the existence of this arc has not been thoroughly investigated in regional sedimentary records. We gathered a large dataset (n &gt; 40,000) of detrital zircon ages, including new and previously published data from eastern India, the Burma Terrane, and the Asian margin to identify age populations that could indicate the presence of this arc. Our synthesis suggests that the arrival of allochthonous material onto India is best explained by input from the Asian forearc (specifically, the Xigaze Forearc) alone, without requiring input from an additional missing arc. These constraints are compatible with Trans-Tethyan models only if they incorporate the Xigaze Forearc into the Trans-Tethyan Arc. Additionally, we show that the Burmese sedimentary record necessitates a missing Cretaceous-Paleogene arc located between Myanmar and Asia. Including the Burma Terrane and its missing arc in the Trans-Tethyan Arc is consistent with provenance and paleomagnetic data but implies a complex assembly history for the arc. Ultimately, a Trans-Tethyan Arc is not required to explain the history of the Burma Terrane and its detrital zircon record. Kinematic models involving an extra-large India and a Burma Terrane located offshore of Asia during the Paleogene are also compatible with these constraints.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"147 ","pages":"Pages 260-275"},"PeriodicalIF":7.2,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144613219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysing the impact of oil prices, economic activity, and trade policy uncertainty on CO2 emissions in the US context: A wavelet approach","authors":"Shine Raju Kappil ,&nbsp;Mustafa Kocoglu ,&nbsp;Umer Jeelanie Banday ,&nbsp;Atif Jahanger","doi":"10.1016/j.gr.2025.06.016","DOIUrl":"10.1016/j.gr.2025.06.016","url":null,"abstract":"<div><div>This study examines the simultaneous co-movements between oil prices, economic activity, trade policy uncertainty, and CO₂ emissions in the United States using a series of wavelet methodologies. Unlike traditional approaches, the wavelet approach is appropriate for understanding the time-varying associations at different frequencies and is designed to efficiently handle the non-stationary nature of economic and environmental time series data. The empirical results highlight the potential of a leading relationship where economic activities and trade policy uncertainties drive CO₂ emissions in the US during the period from January 1990 to January 2022. Contrarily, the link between oil prices and CO₂ emissions is characterized by intricate dynamics, exhibiting both lagging and leading co-movements at different frequencies. Moreover, economic activities have a positive impact on CO₂ emissions, while in the high quantile tails, trade policy uncertainty decreases CO₂ emissions. This means economic activity is slowing down during the period of high trade policy uncertainty. Our findings highlight the necessity of specific policies that reconcile economic growth with environmental sustainability, manage the effect of oil price changes on CO₂ emissions, and match trade policies with emission-minimizing goals. Based on the results, this research offers important implications for policymakers to ensure the equilibrium between economic activity and environmental management within the scope of sustainable development goals.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"147 ","pages":"Pages 213-232"},"PeriodicalIF":7.2,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144613276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 Late Paleozoic ice age termination in Southwestern Gondwana: New evidence from the Paraná Basin","authors":"Franciele Agnesa Trentin ,&nbsp;Joice Cagliari ,&nbsp;Tracy Frank ,&nbsp;Karlos G.D. Kochhann ,&nbsp;Michael T. Hren ,&nbsp;Christopher R. Fielding ,&nbsp;Zhao Wang ,&nbsp;Julia Tedesco ,&nbsp;Carolina Danielski Aquino ,&nbsp;William Lopes","doi":"10.1016/j.gr.2025.06.017","DOIUrl":"10.1016/j.gr.2025.06.017","url":null,"abstract":"<div><div>Records of diachronous ice spreading centers over the Gondwana supercontinent characterize the Late Paleozoic Ice Age (LPIA), which was the most intense and largest ice sheet expansion event of the Phanerozoic Eon. This study presents high-resolution paleoclimate and paleoenvironmental reconstructions of the LPIA termination interval in the southern Paraná Basin (Brazil) using a multiproxy approach that includes sedimentological and geochemical data from a ∼190 m long core. Geochemical proxies used here include elemental ratios, total organic carbon (TOC), stable carbon isotopes of bulk organic matter (δ¹³C_org), and biomarkers. The Gzhelian sedimentary succession recorded two third-order depositional sequences (DS), with significant sedimentological and geochemical changes. DS-1 recorded fining upward turbidite facies with sporadic outsized clasts, reduced chemical weathering intensity, brackish and oxic water conditions with marine influxes, and diminished organic matter accumulation derived from terrestrial and aquatic plant sources. The lower part of DS-2 records a transition from sandstone-rich rhythmite to organic-rich mudrocks, intensification of chemical weathering, and fully marine waters characterized by reducing bottom water conditions leading to increased TOC, with increased proportions of aquatic over terrestrial plant sources. The maximum flooding surface (MFS) within DS-2 records the apex of chemical weathering intensification, and dominance of aquatic over terrestrial plant sources. Above this interval, there is a coarsening upward trend of mudrocks to heterolithic facies with outsized clasts, and a gradual reduction in chemical weathering intensity, coupled with increased contribution of terrestrial plant sources. We suggest that the DS-1 succession formed in a transgressive estuarine environment under a relatively cold/arid climate with floating ice, whereas DS-2 records marine to fluvial-deltaic sedimentation and a climate transition to warmer/wetter conditions. These data support an abrupt climatic amelioration within the Gzhelian Stage in the southern Paraná Basin.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"147 ","pages":"Pages 192-212"},"PeriodicalIF":7.2,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144613220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Editorial Board (IFC)","authors":"","doi":"10.1016/S1342-937X(25)00197-2","DOIUrl":"10.1016/S1342-937X(25)00197-2","url":null,"abstract":"","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"146 ","pages":"Page IFC"},"PeriodicalIF":7.2,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144589294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Chemical, biochemical and environmental DNA analysis of sediments from two seamounts of the deep Arabian Sea","authors":"K. Devika Raj ,&nbsp;Anas Abdulaziz ,&nbsp;C. Jasmin ,&nbsp;M.J. Navya ,&nbsp;Silpa Chandran ,&nbsp;Nizam Ashraf ,&nbsp;Anoop Krishnan ,&nbsp;K.U. Abdul Jaleel","doi":"10.1016/j.gr.2025.06.013","DOIUrl":"10.1016/j.gr.2025.06.013","url":null,"abstract":"<div><div>This study examines the chemical and biochemical properties, as well as the benthic diversity, of seamounts in the Arabian Sea, with a focus on SMS2 and SMS3, located along the Laccadive Ridge in the deep Arabian Sea. The summits of these seamounts interact with oxygen minimum zones (OMZs) at 340 – 440 m, potentially shaping their unique biochemical properties and biodiversity. Sediment collected from the summit of these seamounts revealed significant concentrations of iron (SMS2: 6889 ppm, SMS3: 4888 ppm), manganese (SMS2: 48 ppm, SMS3: 39 ppm), nickel (SMS2: 42 ppm, SMS3: 36 ppm), vanadium (SMS2: 40 ppm, SMS3: 31 ppm), chromium (SMS2: 40 ppm, SMS3: 26 ppm) and zinc (SMS2: 32 ppm, SMS3: 20 ppm). The organic matter present in the sediments is predominantly refractory, characterized by a high carbon-to-nitrogen ratio (SMS2: 30.4, SMS3: 51.2) and low protein content (SMS2: 1131.5 µg g⁻¹, SMS3: 701.0 µg g⁻¹). The study employs environmental DNA (eDNA) techniques to reveal the benthic diversity of these seamounts, which is largely comprised of eDNA signatures from Annelids, Arthropods, and Cnidarians that thrive in low-oxygen, iron-rich environments. This research emphasizes the role of OMZs and geochemical factors in shaping biodiversity and ecological processes on seamounts. Furthermore, the regional variability in heavy metal composition and organic matter dynamics reflects distinct oceanographic conditions across these seamounts. Overall, the findings offer valuable insights into the biochemical composition, benthic biodiversity, and ecological significance of seamounts in the southeastern Arabian Sea, underscoring the necessity for broader investigations to enhance our understanding of deep-sea ecosystems.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"147 ","pages":"Pages 137-146"},"PeriodicalIF":7.2,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144571487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}