Gondwana Research最新文献

{"title":"Comment on “A Saharan fossil and the dawn of Neotropical armoured catfishes in Gondwana” by Brito et al.","authors":"Ralf Britz , Amanda K. Pinion , Kole M. Kubicek , Kevin W. Conway","doi":"10.1016/j.gr.2024.06.014","DOIUrl":"10.1016/j.gr.2024.06.014","url":null,"abstract":"","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"133 ","pages":"Pages 267-269"},"PeriodicalIF":7.2,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141453294","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":"C, N, Hg isotopes and elemental chemostratigraphy across the Ordovician–Silurian transition in the Argentine Precordillera: Implications for the link between volcanism and extinctions","authors":"Alcides N. Sial ,&nbsp;Jiubin Chen ,&nbsp;Silvio Heriberto Peralta ,&nbsp;Claudio Gaucher ,&nbsp;Christoph Korte ,&nbsp;Valderez P. Ferreira ,&nbsp;Luiz D. Lacerda ,&nbsp;José A. Barbosa ,&nbsp;Natan S. Pereira ,&nbsp;Paulo R. Riedel ,&nbsp;Jessica Gómez","doi":"10.1016/j.gr.2024.06.008","DOIUrl":"10.1016/j.gr.2024.06.008","url":null,"abstract":"<div><p>Global geological processes that occurred during the Ordovician–Silurian transition (OST) were investigated exploring sections from the Argentine Precordillera (Cerro La Chilca, Baños de Talacasto and Villicum) which were deposited close to polar zones of Gondwana during the oldest Phanerozoic glaciation. C-N-Hg isotopes and redox-sensitive trace metal chemostratigraphy allowed to assess the relative importance of volcanism, glaciation, post-glacial sedimentation and extinction events during the OST. At Cerro La Chilca and Baños de Talacasto sections, Katian and early Hirnantian strata are missing. Hirnantian and Rhuddanian strata occur in the all three sections. At Cerro La Chilca, coeval positive δ¹³C_org shift, Hg spike and Δ¹⁹⁹Hg ∼ 0 ‰ were recorded in the Sandbian Los Azules Formation, suggesting volcanic Hg loading. Coeval Hg/TOC spikes at the Baños de Talacasto and Villicum sections and Δ¹⁹⁹Hg ∼ 0 ‰ in the late Hirnantian (<em>M. persculptus</em> Zone) recorded the second pulse of the Late Ordovician mass extinction (LOME 2), for which volcanism was postulated as the cause of warming and anoxia. Another Hg/TOC spike in the early Rhuddanian at Baños de Talacasto and Villicum is coeval with slightly positive Δ¹⁹⁹Hg values, an enrichment related, perhaps, to an enhanced continental runoff that followed the Late Ordovician glacial cycle (LOGC-3). At the Cerro La Chilca, positive δ¹⁵N values in the Sandbian suggest less intense water-column denitrification while negative nitrogen isotope values in the LOME 2 period indicate denitrifying conditions. At the Baños de Talacasto and Villicum sections, sea-level fluctuations and nitrogen upwelling helped shaping the δ¹⁵N pathway within the LOME 2 and early Rhuddanian intervals, with negative δ¹⁵N values attesting that conditions became less reducing closer to the OST. The odd-MIF Hg isotope pattern within the LOME 2 time interval was probably induced by coeval volcanism, glaciation and sea-level fall, and in the early Rhuddanian by deglaciation and sea-level rise.</p></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"133 ","pages":"Pages 270-296"},"PeriodicalIF":7.2,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141453302","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":"Late Paleozoic potassic igneous rocks of the Kensu and Dzholkolot plutons in the eastern Kyrgyz Tien Shan: Petrology, geochemistry, U-Pb zircon geochronology, and related skarn-porphyry W-Mo-Cu-Au mineralization","authors":"Serguei G. Soloviev ,&nbsp;Sergey G. Kryazhev ,&nbsp;Dina V. Semenova ,&nbsp;Yury A. Kalinin ,&nbsp;Nikolay S. Bortnikov","doi":"10.1016/j.gr.2024.06.003","DOIUrl":"10.1016/j.gr.2024.06.003","url":null,"abstract":"<div><p>The Kensu and Dzholkolot multiphase intrusions are situated in the eastern part of the “Main Structural Line of Tien Shan”, or the “Nikolaev Line”. The plutons comprise mafic to intermediate (monzogabbro, monzonite, syenite, quartz syenite) and silicic (quartz monzonite, monzogranite, and leucogranite-alaskite) members, together with the interim (camptonite) and final monzodiorite-porphyry dikes. Geochemical signatures of the igneous rocks correspond to high-K calc-alkaline to shoshonitic series intrusions, with a strong A-type affinity, emplaced in post-collisional setting. Magmatic evolution included a generation of shoshonitic magma by a low-degree partial melting of the metasomatically-enriched upper mantle, followed by amphibole fractionation in a deep (lower crustal?) magma chamber. This was followed by a generation of mantle-induced granitic magmas in a crustal protolith, with possible mixing/mingling of various magmas. The rocks crystallized at shallow levels, in an oxidized environment, under decreasing pressure and temperature toward the younger (granitic) intrusion phases.</p><p>Isotopic U-Pb (LA-ICP-MS) zircon dating of the igneous rocks indicates their Late Carboniferous age (ca. 325–302 Ma). The magma emplacement included a number of intrusion phases from monzogabbro (321 ± 4 Ma), monzonite (319 ± 4 Ma), and camptonite (306 ± 4 Ma), to quartz syenite (305.5 ± 2 Ma to 302 ± 3.7 Ma), quartz monzonite (305 ± 3 Ma) and subsequent granitic phases. Although the ages identified correspond to those of the subduction-related magmatism in the western part of the Middle Tien Shan, geochemical characteristics of the rocks supporting rather post-collisional setting of the plutons are in agreement with a “scissor-like” closure of the Turkestan paleoocean, starting from the east. Zircon xenocrysts dated at ca. 1.9 Ga suggest the presence of an underlying old continental crust.</p><p>The skarn-porphyry W-Mo(−Cu-Au) mineralization complements the group of similar deposits associated with high-K calc-alkaline to shoshonitic series intrusions in the Middle Tien Shan and globally. The high endowment in W and Mo can be related to the fertilization of subduction-modified subcontinental lithospheric mantle in these metals, together with more common fertilization in Cu and Au, with its subsequent involvement in the magma generation in post-collisional setting. The endowment in W and Mo can also reflect a greater involvement of an ancient continental crust as the magma source(s). The oxidized paragenesis of hydrothermal alteration assemblages and mineralization corresponds to the respective affinities of the igneous rocks.</p></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"133 ","pages":"Pages 239-266"},"PeriodicalIF":7.2,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141453312","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":"What controls structural variations along the Zagros Collision Zone? Insights from geophysical observations and thermo-mechanical modelling","authors":"Magdala Tesauro ,&nbsp;Petra Maierová ,&nbsp;Alexander Koptev ,&nbsp;Alberto Pastorutti ,&nbsp;Tommaso Pivetta ,&nbsp;Ivan Koulakov ,&nbsp;Carla Braitenberg","doi":"10.1016/j.gr.2024.06.009","DOIUrl":"https://doi.org/10.1016/j.gr.2024.06.009","url":null,"abstract":"<div><p>The Zagros Collision Zone is a complex tectonic region formed as a consequence of the collision between Arabia and Eurasia after the subduction of the Neo-Tethys ocean. The NW-SE striking Zagros orogen consists of the following parallel tectonic units (from SW to NE): Zagros Fold and Thrust Belt (ZFTB), Sanandaj–Sirjan Metamorphic Zone (SSZ), and Urumieh–Dokhtar Magmatic Arc (UDMA). In this study, we perform a combined analysis of recent geophysical data, revealing pronounced differences in the crustal and lithospheric structure along the Zagros Mountains. The northwestern sector shows a fairly uniform crustal thickening across the broad symmetric orogen from the ZFTB to the UDMA. In contrast, in the central Zagros, the transition from a relatively narrow zone of high elevations and high-frequency relief in the ZFTB to a smoother surface topography of the SSZ and UDMA occurs with an abrupt increase in Moho depth below the SSZ. The last observation has recently been interpreted as a result of “relamination” process, where the felsic upper crust of the Arabian plate underthrust the mafic crust of the Iranian plate. We present geodynamic numerical models of crustal relamination during continental collision and compute static gravity field of the resulting structures. We show that oblique closure of the Neo-Tethys affects lateral variations in the style and extent of crustal relamination, which control the observed along-strike changes in crustal configuration and orogen altitude. In particular, a narrow and higher orogen (as in the central Zagros) develops in the experiments with a young and wide oceanic plate, whereas an old and narrow subducting plate tends to form a broad and lower topography (as in the northwestern Zagros). This is geometrically consistent with the progressive closure of the Neo-Tethys from NW to SE during the oblique continental collision between Arabia and Eurasia.</p></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"133 ","pages":"Pages 297-322"},"PeriodicalIF":7.2,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141483977","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":"Links between hydrographic restriction, redox conditions, and organic matter accumulation in the Early Cambrian intrashelf basin, South China","authors":"Wenyao Xiao ,&nbsp;Jian Cao ,&nbsp;Zhiwei Liao ,&nbsp;Xiaomei Wang ,&nbsp;Shuichang Zhang","doi":"10.1016/j.gr.2024.06.011","DOIUrl":"10.1016/j.gr.2024.06.011","url":null,"abstract":"<div><p>There was a strong relationship between paleo-oceanic conditions and organic matter accumulation during the critical period of the Early Cambrian. The Yangtze Platform in South China provides an opportunity to study this relationship, but the basin architecture and paleo-hydrographic dynamics remain poorly understood, which hinders one’s understanding of the evolution in oceanic redox state and its relationship to organic matter accumulation. To fill the knowledge gap, a newly obtained data set from the Lower Cambrian Niutitang Formation shales (Late Cambrian Stage 2-Stage 3) of the intrashelf basin is used. Results show that the molybdenum–uranium covariation, along with the abnormally low Mo contents and Mo/TOC ratios in the anoxic (ferruginous and euxinic) Niutitang shales of the intrashelf basin, indicate a hydrographic circulation that is moderately to strongly restricted. The hydrographic evolution at different stages, influencing redox conditions to a certain extent, in conjunction with variations in primary productivity, controls the enrichment of organic matter. In particular, the relatively low sea level during Interval I (Late Stage 2) resulted in weak connectivity between the intrashelf basin and open ocean; this, coupled with high primary productivity and enhanced chemical weathering, formed stable stratified water (euxinic bottom-water) conditions that were favorable for organic matter enrichment. In contrast, Interval II (Early–Middle Stage 3) and Interval III (Late Stage 3) involved less organic matter enrichment due to weakened restricted hydrographic circulation (Interval II) and oxic bottom-water conditions (Interval III). This study highlights how hydrodynamic processes affected the marine environment during the Early Cambrian and reveals that sluggish oceanic circulation combined with high primary productivity led to anomalous enrichment of organic matter. This may be a common feature of basins with restricted hydrographic circulation in deep time.</p></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"133 ","pages":"Pages 199-215"},"PeriodicalIF":7.2,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141453300","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":"Permian tectonic evolution of the proto-Japan and East Asia: Insights from detrital zircon geochronology and crystal morphology","authors":"Masahiro Ohkawa ,&nbsp;Makoto Takeuchi ,&nbsp;Nozomi Matsuzawa ,&nbsp;Sakurako Yabuta ,&nbsp;Koshi Yamamoto","doi":"10.1016/j.gr.2024.06.010","DOIUrl":"10.1016/j.gr.2024.06.010","url":null,"abstract":"<div><p>Combination analyses of detrital zircon ages and morphology from Permian sandstones in Japan provide evidence of orogenic evolution caused by collision in East Asia and reveal their paleogeographic setting. This study compares published and newly measured data from Permian fore-arc accretionary complexes (Akiyoshi Belt) and back-arc basin deposits (Maizuru Belt) in the Inner Zone of Southwest Japan. The fore-arc deposits and lower part of the back-arc deposits consist mainly of approximately 300–250 Ma zircon grains that are close to the depositional ages and are generally angular to subangular. These sediments formed around the Late Paleozoic volcanic arc isolated from the older continental crust, and their source rocks were exposed immediately prior to their erosion and transport and were transported directly to the depositional site in a relatively short time. In contrast, upper part of the back-arc deposits generally contains approximately 2,700–1,800 and 500–250 Ma zircon grains, which are commonly older than their depositional ages and are rounded. These grains were supplied from multiple sources, such as the Paleozoic volcanic arc and Precambrian continental block, and were affected by long-distance transport and a strong abrasion effect during transport. Comprehensive detrital zircon data emphasize that the oceanic arc–back-arc basin–continental margin system formed along the eastern margin of East Asia, and that the volcanic arc collided with the eastern margin of the Sino-Korean Block during the Permian. The variation in detrital zircon ages and shapes of back-arc deposits provides a constraint for modeling the East Asian Permian collision. Detritus derived from continental crust was captured by a back-arc basin and blocked by the uplift zone of the volcanic arc. However, a small amount of detritus originating from the continental crust was supplied to the fore-arc.</p></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"133 ","pages":"Pages 216-238"},"PeriodicalIF":7.2,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141453299","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":"Big data, green loans and energy efficiency","authors":"Jian Wang ,&nbsp;Huai Deng ,&nbsp;Xin Zhao","doi":"10.1016/j.gr.2024.05.008","DOIUrl":"https://doi.org/10.1016/j.gr.2024.05.008","url":null,"abstract":"<div><p>Green digital finance is an instrumental way to promote technological innovation, accelerate the low-carbon transition, and foster sustainable development. With the emergence of green digital finance, how does it affect firms’ energy use efficiency? Using big data and green loans as an entry point, the impact of green digital finance on corporate energy efficiency and the role of big data are examined. We provided a simple theoretical model to analyze the green loaning behavior of the banking sector after applying big data and its impact on corporate energy efficiency. Our research finds that: (1) The application of big data can make it easier for the banking sector to obtain loan companies’ information and reduce loan delinquency rates. This will reduce the information and transaction costs of the banking sector and expand the scale of optimal green loans. (2) The optimal green loan scale has a negative relationship with the optimal green loan interest rate. (3) The application of green loans by firms can improve energy efficiency and have a range of impacts on firms’ decision-making, including an increase in the emission reduction ratio, innovation probability, output, and profit, followed by a decrease in energy consumption and pollution emissions. This paper further clarifies the channels through which green digital finance affects energy efficiency and specifies the role of big data in green digital finance. This could help relevant policymakers design more effective green digital finance policies, contributing to carbon peaking and carbon neutrality goals.</p></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"133 ","pages":"Pages 323-334"},"PeriodicalIF":7.2,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141483976","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(24)00165-5","DOIUrl":"https://doi.org/10.1016/S1342-937X(24)00165-5","url":null,"abstract":"","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"132 ","pages":"Page IFC"},"PeriodicalIF":6.1,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1342937X24001655/pdfft?md5=5a06e2b8b428e973e1caea1ad8046806&pid=1-s2.0-S1342937X24001655-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141423692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Archean UHT metamorphism with counterclockwise P–T path: Insights from pelitic granulites from East Hebei, North China Craton","authors":"Ting Liu ,&nbsp;Chunjing Wei ,&nbsp;Tim E. Johnson","doi":"10.1016/j.gr.2024.06.007","DOIUrl":"https://doi.org/10.1016/j.gr.2024.06.007","url":null,"abstract":"<div><p>Archean supracrustal rocks that occur as rafts within tonalite–trondhjemite–granodiorite (TTG) gneisses can reach ultra-high temperature (UHT) conditions. Their metamorphic <em>P–T</em> paths and geodynamic regimes are debated. Herein, we present detailed analyses of UHT pelitic migmatites (JD1730 and JD1733) from the East Hebei, North China Craton, using petrology, phase equilibria modelling, and zircon dating, to recover the metamorphic history. Sample JD1730 is a sillimanite–orthopyroxene–cordierite migmatite that contains the sillimanite + orthopyroxene (+cordierite) symplectites, which are interpreted to be the pseudomorphs after sapphirine. JD1733 is a corundum-bearing garnet–cordierite–sillimanite migmatite that contains the corundum + spinel ± ilmenite/rutile aggregates, representing a stable mineral association of low pressures in local Si-unsaturated domains. The two rocks record consistent counterclockwise <em>P–T</em> paths involving pre-peak up-<em>P</em> processes to the UHT peak conditions followed by cooling. The pre-peak up-<em>P</em> processes occurred at 5–7 kbar and &gt; 970 °C constrained from the textural relations involving (i) spinel enveloped by sillimanite and cordierite and mantled by the Sil + Opx symplectites in JD1730, and (ii) the inclusion variation in garnet of JD1733 with the Spl + Crn (±Ilm) aggregates embayed by sillimanite in the core and mantle, and worm-like quartz in the rim. The UHT peak conditions can be constrained to be 7–8 kbar, 980–1060 °C based on the stability of the inferred peak mineral assemblages in <em>P–T</em> pseudosections added with the plots of the re-integrated anorthite contents from perthite. The post-peak cooling processes to 5–8 kbar / 820–850 °C are marked by the growth of biotite in leucosomes of both samples. Zircon dating and geothermometry results suggest that the UHT metamorphism might have persisted for more than 20 Myr from ∼ 2.52 Ga to ∼ 2.50 Ga and the post-UHT cooling continued another 20 Myr or even 40 Myr. Considering the geological features in the terrane, a vertical sagduction regime was preferred for the Neoarchean tectonic evolution of the East Hebei terrane.</p></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"133 ","pages":"Pages 108-128"},"PeriodicalIF":7.2,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141433951","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":"Structural anatomy of the newly recognized Paleozoic Dacaotan composite mélange belt: Implications for the subduction-accretion processes in the North Tianshan Ocean, southwestern Central Asian Orogenic belt","authors":"Wei Wang ,&nbsp;Guocan Wang ,&nbsp;Meng Zhang ,&nbsp;Ali Polat ,&nbsp;Ruilu Guo ,&nbsp;Pan Zhang ,&nbsp;Qunan Liao ,&nbsp;Zhangyan Wang","doi":"10.1016/j.gr.2024.06.005","DOIUrl":"10.1016/j.gr.2024.06.005","url":null,"abstract":"<div><p>The North Tianshan Belt occupies a pivotal geological position within the southwestern Central Asian Orogenic Belt, making it an ideal location to unravel the long-term evolutionary history of the North Tianshan Ocean. However, how, and when the Tianshan oceanic basin was finally consumed and closed remains highly debated. To resolve these questions, here, we conducted a comprehensive investigation of the different litho-tectonic assemblages of the Dacaotan composite mélange belt in the North Tianshan Belt. Using detailed geological mapping, structural analyses, rock associations, and new geochemical and geochronological data, we divide the Dacaotan composite mélange belt into three litho-tectonic assemblages: (1) the southern sedimentary forearc (ca. 423–398 Ma) assemblage that is characterized by relatively coherent and well-bedded flysch sequences; (2) the central supra-subduction zone-type ophiolitic mélange assemblage (ca. 468–461 Ma) consisting of petrogenetically linked upper mantle and oceanic crustal components, which are exposed as tectonic slices or blocks within a serpentinite and sedimentary matrix; and (3) the northern accreted ocean plate stratigraphy mélange assemblage (ca.448–398 Ma) that is composed of accreted trench-fill turbidites, seamounts (OIB-like basic rocks) and ocean floor rocks (MORB-like basic rocks) dispersed in a sandy to pelitic matrix. Post-kinematic pluton and dyke reveal that the final accretionary event was completed prior to ca. 371 Ma. In conjunction with the spatial–temporal configurations of the different litho-tectonic assemblages, we conclude that the North Tianshan Ocean underwent bi-directional subduction and intra-oceanic subduction events during the Early Paleozoic. Our findings suggest the final consumption of the North Tianshan Ocean basin occurred before the Latest Devonian, resulting in the formation of the ultimate suture between the Central Tianshan Block and the North Tianshan Belt along the Kanggguertag-Dacantao composite mélange belt.</p></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"133 ","pages":"Pages 170-198"},"PeriodicalIF":7.2,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141389846","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}