Gondwana Research最新文献

{"title":"Failed rift propagation at lithospheric-scale shear zones and terrane boundaries: implications for Gondwana breakup in the South Atlantic","authors":"Aline C. Tavares ,&nbsp;David L. Vasconcelos ,&nbsp;Fernando O. Marques ,&nbsp;Walter E. Medeiros ,&nbsp;Leonardo C. Palhano ,&nbsp;Francisco C.C. Nogueira ,&nbsp;Reinhardt A. Fuck ,&nbsp;Maria O.L. Sousa ,&nbsp;Renato R.S. Dantas ,&nbsp;Roberto G. Oliveira ,&nbsp;Francisco H.R. Bezerra","doi":"10.1016/j.gr.2025.09.005","DOIUrl":"10.1016/j.gr.2025.09.005","url":null,"abstract":"<div><div>This study investigates how preexisting tectonic structures and crustal strength influence the formation and arrest of rifts, focusing on the Jatobá and Tucano basins in NE Brazil—part of a failed rift system related to the Gondwana breakup. We integrate aeromagnetic and gravity data with structural observations in the Recôncavo-Tucano-Jatobá (RTJ) Rift to better understand this process. Our results show that the RTJ rift propagated northward by reactivating N–S-trending Precambrian structures around 142 Ma, later shifting to E–W propagation along the Ibimirim Fault. This shift was controlled by E–W and ENE–WSW-striking faults that crosscut earlier N–S structures and by the varying strength and orientation of lithotypes across the Pernambuco Shear Zone. The Ibimirim Fault, the master fault of the Jatobá Basin, was influenced by stronger terranes in the west and the shear zone in the east. Geophysical data reveal two crustal blocks with higher density and thickness, suggesting increased rigidity that resisted rift propagation across the shear zone around 121 Ma. These issues associated with the subsequent changes in plate motion altered the stress field, redirecting rifting eastward to the Pernambuco and Paraíba basins (∼100–85 Ma), the final land connection between Africa and South America. This shift led to the activation of the Sergipe-Alagoas–Gabon Rift System. Our findings offer new insights into the tectonic processes driving the breakup of Gondwana.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"150 ","pages":"Pages 23-40"},"PeriodicalIF":7.2,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145271208","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":"Climate change-driven dieback triggers metal mobilization in mangroves: a case study from the Maldives","authors":"S. Sreelekshmi ,&nbsp;Aishath Farhath Ali ,&nbsp;S. Bijoy Nandan ,&nbsp;E.H. Aravind ,&nbsp;Mohamad Saddam Hussain ,&nbsp;K. Avarachen Mathew ,&nbsp;Murat V. Ardelan","doi":"10.1016/j.gr.2025.09.006","DOIUrl":"10.1016/j.gr.2025.09.006","url":null,"abstract":"<div><div>Mangrove ecosystems play a vital role in mitigating trace metal pollution by acting as natural biofilters that trap and accumulate trace metals from surrounding sediments. However, climate change-induced stressors, such as sea level rise and salinity fluctuations, can disrupt their regulatory capacity. In March 2020, a large-scale dieback of <em>Bruguiera cylindrica</em> in northern Maldives occurred, attributed to extreme climatic conditions, sea level rise, and enhanced salinity. This study examines the variability of 8 trace metals in sediments and plant tissues across dieback and non-dieback zones, assessing the impact of climate change on metal bioavailability and accumulation. Sediment analysis revealed consistently higher metal concentrations in non-dieback zones, reflecting enhanced sediment retention by healthy stands, while dieback sites exhibited erosion and flushing of metals due to altered hydrodynamics. Pollution load and geoaccumulation indices indicated moderate to very high contamination, particularly for Cd, often linked to agricultural runoff and local anthropogenic inputs. <em>Bruguiera cylindrica</em> in dieback areas exhibited elevated metal uptake, particularly Cu and Cd, while non-dieback sites showed below-detection levels, suggesting stress-enhanced uptake and translocation of bioavailable metals. These findings revealed that climate-induced mangrove mortality not only weakens the sedimentary sink function but may also increase metal export and toxicity risks to adjacent marine systems. Large-scale dieback events in the Maldives parallel observations from Australia and Brazil, underscoring the global vulnerability of mangroves to climate extremes. For island nations, these results highlight the urgency of integrated strategies to mitigate climate impacts, regulate metal inputs, and restore mangrove resilience as critical defenses against coastal degradation and pollution.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"150 ","pages":"Pages 1-13"},"PeriodicalIF":7.2,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145242558","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":"Coexisting wet and damp magma fractionation in the middle crust: An example from the Gangdese Batholith in southern Tibet","authors":"Rui-Qiang Wang ,&nbsp;Di-Cheng Zhu ,&nbsp;Ding-Jun Wen ,&nbsp;Ying Xia ,&nbsp;Yue Chen","doi":"10.1016/j.gr.2025.08.023","DOIUrl":"10.1016/j.gr.2025.08.023","url":null,"abstract":"<div><div>Fractional crystallization of mantle-derived magmas is an effective mechanism for developing the chemical stratification of the continental crust at convergent plate margins. However, identifying such a mechanism is a challenge when the complementary cumulate rocks are missing. To address this issue, we present geochronological, mineral chemical, whole-rock geochemical, and zircon Hf isotopic data for the Kazi intrusive complex (hornblende gabbro and monzonite) in the Gangdese Batholith, southern Tibet. Zircon U–Pb dating shows that the Kazi complex formed at 94–90 Ma. The hornblende gabbro contains hornblende crystals with concentric zoning and the monzonite contains hornblende crystals with clinopyroxene inclusions. Mineral-based geothermobarometers indicate that the parental magmas of the Kazi complex first partially crystallized in the middle crust before being emplaced in the upper crust. Whole-rock major and trace element compositions, as well as those of calculated melts in equilibrium with early crystallized clinopyroxenes, reveal that the monzonites experienced clinopyroxene and plagioclase fractionation. The hornblende gabbros yield calculated melt major and trace element compositions in equilibrium with early crystallized hornblendes that are similar to those of adjacent adakitic granitic dikes, indicative of hornblende–melt separation in their generation. These features and the similar depleted zircon Hf isotopic compositions of the various lithologies show that formation of the Kazi complex was controlled primarily by coexisting wet and damp magma fractionation in the middle crust, and that the adakitic geochemical characteristics of some Late Cretaceous granitic dikes in the Gangdese Batholith could be due to hornblende-dominated fractionation of arc magmas.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"149 ","pages":"Pages 395-411"},"PeriodicalIF":7.2,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145217179","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":"Fine-scale provenance variability during the initial Cambrian transgression on the peri-Gondwana margin: Detrital zircon geochronology of the basal Taebaek Group, eastern North China Platform","authors":"Donghyeok Kang ,&nbsp;Jusun Woo","doi":"10.1016/j.gr.2025.09.003","DOIUrl":"10.1016/j.gr.2025.09.003","url":null,"abstract":"<div><div>Extensive detrital zircon U-Pb data, resolved at fine spatial and temporal scales, provide detailed information on how sediment sources and dispersal systems evolved throughout platform development. Regional scale provenance analysis is conducted from the Cambrian basal Taebaek Group (the Jangsan, Myeonsan, and Myobong formations), Taebaeksan Basin in the eastern margin of the North China Platform using detrital zircon geochronology (41 samples, 1762 analyses) to reveal spatial and stratigraphic variability of the age spectra. The integrated data are classified into three groups: Group 1 (&gt;1700 Ma, double peaks at ∼ 2.50 Ga and 1.87 Ga, from the Yeongnam Massif); Group 2 (1700–575 Ma, from Gondwana or other sources in the Sino-Korean Craton); Group 3 (youngest clusters at ca. 500 Ma, high Th/U ratios, from an outboard arc). The Jangsan Formation consists mainly of Group 1 zircons. The Myeonsan Formation contains groups 1 (83 %) and 3 (15 %), with minor Group 2. The Myobong Formation is dominated by groups 2 (72 %) and 3 (7 %) in the western/southern basin, but retains groups 1 (96 %) and 3 (2 %) in the northern/eastern part. Basal coarse-grained units were primarily sourced from adjacent basement rocks without <em>ex-situ</em> sediments. With ensued transgression, these sources were submerged, shifting provenance to upland areas and the outboard arc. Subsequent base-level rise led to the rapid influx of fine-grained sediments from outboard sources from Gondwana or other Sino-Korean sources, causing abrupt detrital zircon changes in the low-gradient western/southern basin. In contrast, the northern/eastern basin retained a consistent local basement signature, even in fine-grained deposits. These fine-scale variations likely reflect the interplay of topographic changes and global marine transgression. These, together with stratigraphic and sedimentological data, lead to a better understanding of the early-stage basin-filling history of the Taebaeksan Basin in the eastern North China Platform.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"149 ","pages":"Pages 412-428"},"PeriodicalIF":7.2,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267069","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":"Multi-phase intra-plate rifting and deformable plate modelling of the Northeast Atlantic back to the Permian","authors":"Grace E. Shephard ,&nbsp;Mansour M. Abdelmalak ,&nbsp;Jan Inge Faleide ,&nbsp;Edward Clennett ,&nbsp;Sabin Zahirovic ,&nbsp;Sebastien Gac ,&nbsp;Peter Haas ,&nbsp;Carmen Gaina ,&nbsp;Trond H. Torsvik","doi":"10.1016/j.gr.2025.09.002","DOIUrl":"10.1016/j.gr.2025.09.002","url":null,"abstract":"<div><div>The Northeast Atlantic was one of the last regions of the Pangea supercontinent to undergo complete break-up, experiencing over 200 million years of episodic continental stretching before final separation. This prolonged tectonic evolution has been studied using recent geological and geophysical data obtained from the mid-Norwegian and East Greenland margins, which provide constraints on the timing, location, amount, and direction of extension. To analyse these parameters, we adopt a basin-to-plate scale approach and develop a deformable plate reconstruction. We implement four discrete phases of rifting: Phase I (264–247 Ma), Phase II (166–140 Ma), Phase III (125–110 Ma), Phase IV (80–56 Ma), with a progressive shift in extension direction from east-west to southeast-northwest. A key component of our methodology is the restoration of basin hinges for each rift episode. These hinges mark the outermost rigid boundaries of the deforming region and provide essential structural constraints. Over time, the width of the rifting domain narrows from approximately 300 km to 220 km, depending on margin location. Our model predicts cumulative stretching ranging from 240 km in the north to 310 km in the south of the domain. Extension rates and amounts vary by phase; for a mid-margin location, Phase I accounts for approximately 90 km of extension at 0.5 cm/yr, Phase II for 30 km at 0.13 cm/yr, Phase III for 90 km at 0.58 cm/yr, and Phase IV for 80 km at 0.32 cm/yr. By comparing forwards- and backwards-in-time crustal thickness reconstructions, our results suggest an initial crustal thickness exceeding 35 km before the onset of Permian rifting, and that lateral variations of non-linear stretching were likely. Our framework indicates that both rigid and deforming reconstructions should be developed in tandem with regional basin-scale constraints. Our model will form the basis for additional regional temporal and structural investigations including the Barents Sea, North Sea, and Northwest North Atlantic.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"149 ","pages":"Pages 465-490"},"PeriodicalIF":7.2,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145320607","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":"Timing of the telescoped sediment-hosted Cu-(Ni) and Pb-Zn-Ba mineralization at the Oumjrane vein system (Eastern Anti-Atlas, Morocco) and its relevance to Pre-Cretaceous Central Atlantic and Maghrebian Tethys geodynamics","authors":"Mohamed Idbaroud ,&nbsp;Mohammed Bouabdellah ,&nbsp;Gilles Levresse ,&nbsp;E.L. Mostafa Mouguina ,&nbsp;Ryan Mathur ,&nbsp;Erik Melchiorre ,&nbsp;Johan Yans ,&nbsp;Ahmed El Guedou","doi":"10.1016/j.gr.2025.08.022","DOIUrl":"10.1016/j.gr.2025.08.022","url":null,"abstract":"<div><div>The structurally controlled vein-type Oumjrane Cu-(Ni-Pb-Zn-Ba) district (5.7 Mt at 1.5 % Cu) consists of a 25 x 25 km-wide system of steeply dipping ENE- to E-W-trending quartz-sulfide fault veins hosted in a succession of Ordovician low-grade phosphorus-bearing siliciclastic metasedimentary rocks of the first (Upper Darriwilian-Sandbian) and second (Hirnantian) Bani Groups. Based on textural relationships and mineral assemblages, two major sulfide fault-vein infill events are recognized. The early event, which is copper-rich and economically the most productive, consists of chalcopyrite with subordinate gersdorffite (NiAsS) and magnetite, closely intergrown with quartz and apatite-1. The later Pb-Zn-Ba event comprises galena and sphalerite as the principal sulfides embedded in a barite-dominated and apatite-2 matrix. Major and trace element chemistry and LA-ICP-MS U-Pb dating of ore-related apatite from both mineralization events are used to determine the absolute age(s) of mineralization and related geodynamic setting(s). The obtained ages are 175.6 ± 1.1 Ma (MSWD = 1.3) for the first copper-rich event, and 151.3 ± 3.1 Ma (MSWD = 0.46) for the later lead-zinc-barite event. The trace element composition of apatite-1from the first copper event reflects the involvement of regional circulation of predominantly Cl⁻ and OH^–, and SO₄²⁻ hydrothermal basinal brines in a dominantly rock-buffered system. Conversely, apatite-2 chemistry from the late Pb-Zn-Ba event is consistent with a magmatic-hydrothermal origin. High fluid-rock ratios would have resulted in mobilization of metals and their transport into the hydrothermal system through the ENE- to E-W-trending faults which acted as pathways for the upward flow of the ore-forming fluids. From a geodynamic perspective, the new U-Pb ages correlate with the successive peak of the hyper-extension of Maghrebian Tethys and initial stages of Central Atlantic passive margin formation. Remarkably, these post-Variscan radiometric dates offer new insights challenging the previously established timeline for the Anti-Atlas copper belt genetic models, situating it within a broader, rich metallogenic period in North Africa and Europe.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"149 ","pages":"Pages 351-372"},"PeriodicalIF":7.2,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145217299","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":"Synergistic enhancement of Asian monsoons to westerlies intensifies the drying trend of arid Central Asia over the last 20 years","authors":"Yu Luo ,&nbsp;Changchun Xu ,&nbsp;Zhiyi Li ,&nbsp;Lin Li ,&nbsp;Qian Wang ,&nbsp;Qiyue Zhang","doi":"10.1016/j.gr.2025.08.021","DOIUrl":"10.1016/j.gr.2025.08.021","url":null,"abstract":"<div><div>As global warming intensifies, understanding the interactions between the westerlies and Asian monsoons becomes increasingly crucial for predicting regional climate change and managing water resources effectively. However, current knowledge regarding how these atmospheric systems influence dry-wet climate change (DWCC) in Arid Central Asia (ACA) remains insufficient. This study examines the long-term trends in DWCC and evaluates the individual and combined impacts of the westerlies and Asian monsoons on ACA from 1940 to 2022, using the Standardized Precipitation Evapotranspiration Index (SPEI) and atmospheric circulation data. Results indicate that the summer climate in ACA has generally become slightly drier over the past 80 years, with a notable increased in aridity beginning in the 1990s. Spatially, ACA exhibits contrasting dry-wet trends from the southeast to the northwest, with drier areas becoming drier and wetter areas becoming wetter. The influence of Asian monsoons on DWCC in Northern Xinjiang (NX), the Tianshan Mountain area (TM) and the Central Desert (CD) surpasses that of the westerlies. Over the past two decades, as the westerlies weakened, the correlation between the summer SPEI and both the East Asian Monsoon Index (EMI) and South Asian Monsoon Index (SMI) increased, suggesting a growing influence of monsoonal systems. Specifically, the East Asian monsoon (above 700 hPa) and South Asian monsoon (below 700 hPa) demonstrate enhanced effects. The interactive effects between the westerlies and Asian monsoons on DWCC are more pronounced than the influence of either system alone or in combination with a third. Particularly under conditions of weak (strong) westerlies and strong (weak) monsoons, the climate in ACA tends to become drier (wetter). Overall, the increasing synergy between the westerlies to monsoons has accelerated the aridification process in ACA over the past two decades.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"149 ","pages":"Pages 337-350"},"PeriodicalIF":7.2,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155423","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":"New insights on active geodynamics of Iberia and Northwestern Africa from seismic stress and geodetic strain-rate fields","authors":"Asier Madarieta-Txurruka ,&nbsp;Juan F. Prieto ,&nbsp;Joaquín Escayo ,&nbsp;Federico Pietrolungo ,&nbsp;José A. Peláez ,&nbsp;Jesús Galindo-Zaldívar ,&nbsp;Jesús Henares ,&nbsp;Federica Sparacino ,&nbsp;Gemma Ercilla ,&nbsp;José Fernández ,&nbsp;Mimmo Palano","doi":"10.1016/j.gr.2025.08.020","DOIUrl":"10.1016/j.gr.2025.08.020","url":null,"abstract":"<div><div>The convergence between Eurasia and Africa during Alpine orogeny drives complex geodynamic processes, involving multiple crustal blocks. In the Atlantic-Mediterranean transition zone, the geodynamics is controlled by the two main plates, the former Iberian microplate and the Alboran Domain. Nowadays, these crustal domains, composed of continental and oceanic crust of varying ages, show distinct deformation behaviors under the current regional stress regime. Through analysis of an enhanced earthquake focal mechanism catalog and updated GNSS velocity field, we constrained the crustal stress–strain fields with unprecedented resolution. Three key findings emerged. First, the different crustal blocks interacting in the region determine the stress–strain fields along the plate boundary, allowing us to define four sectors: Atlantic, Gibraltar, Alboran, and Algero-Balearic. Second, in the Atlantic sector, stresses are directly transferred between Africa and Eurasia, while westward they are absorbed by the thinned continental crust of the Alboran Domain and the continental margins of the Gibraltar Arc and Tell Cordillera. This framework, combined with the oblique Eurasia-Africa convergence relative to the Southwestern Iberian margin, could facilitate the clockwise rotation of Iberia. Finally, intraplate regions with low horizontal strain-rates still show tectonic activity influenced by regional compression and other geodynamic processes driven by vertical stresses. This study highlights the value of combined grid-based stress and strain-rate field analysis for understanding geodynamic processes in complex plate boundary regions.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"149 ","pages":"Pages 314-336"},"PeriodicalIF":7.2,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155422","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":"Upper Mesozoic tectonic evolution of the Meso-Tethys Ocean: Geochronological and geochemical constraints from central Tibetan Plateau ophiolites and magmatic arc rocks","authors":"Zhen Wang ,&nbsp;Yuruo Shi ,&nbsp;Michele Lustrino ,&nbsp;Federico Rossetti ,&nbsp;Mohsen Nasrabady ,&nbsp;J.Lawford Anderson ,&nbsp;Qiong Ci ,&nbsp;Qing Qian ,&nbsp;Nyima Taring","doi":"10.1016/j.gr.2025.08.010","DOIUrl":"10.1016/j.gr.2025.08.010","url":null,"abstract":"<div><div>Ophiolites and magmatic arc rocks can provide key constraints on tectonic and geodynamic reconstructions of collisional zones, involving continental assembly and fragmentation through time. With the aim to better define the regional geodynamic evolution of central Tibetan Plateau, in this contribution we report new whole-rock chemical and zircon SHRIMP U-Pb age data from ophiolites and associated magmatic arc rocks of the Meso-Tethys oceanic realm. Lower Cretaceous oceanic crust is indicated by MORB-like pillow basalts (132.9 ± 1.4 Ma) from the Dongqiao ophiolite and sheeted dikes (116.8 ± 1.4 Ma) from the Yunzhug ophiolite. Their geochemical fingerprints are compatible with a DMM-like source, slightly modified by slab-derived metasomatic components, demonstrating a back-arc paleo-tectonic setting of formation. Magmatic arc rocks from the northern and central Lhasa sub-terranes and southern Qiangtang terrane include I-type granitoids from the Asa (155.5 ± 1.0 Ma), Jiarebu Tso (136.1 ± 1.3 Ma), and Dongqiao (107.5 ± 0.9 Ma) areas. These rocks are all compatible with an origin in subduction to post-collisional settings, involving both lower crustal and mantle-derived components. The adakite-like andesites of Wuru Tso (114.1 ± 1.2 Ma) and the andesites of Tangra Yumco (116.1 ± 1.4 Ma) both indicate derivation from subduction-related sources. Specifically, the Wuru Tso andesites originated from the partial melting of an oceanic slab contaminated by enriched mantle, without continental crust contribution, whereas the Tangra Yumco andesites were derived from a subduction-modified mantle source. When framed in the regional scenario, the new temporal and geochemical constraints presented in this study suggest a new Mesozoic geodynamic evolution for the Meso-Tethyan Ocean that includes: (a) co-existence of two retreating subduction systems with opposite polarities (northward and southward) at ∼ 155 Ma; (b) back-arc extension in the upper-plate domains during ∼ 136–132 Ma; (c) slab break-off at ∼ 117–114 Ma; and (d) collision and post-collisional tectonics in the Lhasa-Qiangtang starting at ∼ 107 Ma.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"149 ","pages":"Pages 373-394"},"PeriodicalIF":7.2,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145217300","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":"Analyzing the synergies between green energy, green technology, and environmental sustainability in China: Novel insights from time-varying quantile approaches","authors":"Shamaila Butt, Muhammad Ramzan, Muhammad Ali Chohan, Natasha Murtaza, Tomiwa Sunday Adebayo","doi":"10.1016/j.gr.2025.08.017","DOIUrl":"https://doi.org/10.1016/j.gr.2025.08.017","url":null,"abstract":"In the face of mounting environmental challenges and emerging geopolitical dynamics, the Paris Agreement and COP28 have underscored the urgent need for clean energy transition and environmental preservation. As sustainability becomes increasingly crucial in shaping the world’s future, there is a pressing need for an inclusive policy framework to advance sustainable energy initiatives and strengthen ecological preservation efforts. Thus, we investigate the dynamic time-varying connectedness between the load capacity factor (LCF) in China and key associated variables. These variables include renewable energy consumption (REC), green technology (GT), Economic Freedom (EF), Financial Development (FD), and Geopolitical Risk (GPR) from 1990 to 2022, conducting a thorough investigation of their interdependencies. The results of time-varying quantile regression and rolling window-based nonparametric quantile causality tests reveal the substantial effects of these factors across time and quantile quantile-varying effects on environmental sustainability. Particularly in times of global crisis, GPR has a significant influence, while GT and the use of REC sources constantly increase efficiency, especially during policy-driven periods. Based on the findings, we have formulated a comprehensive policy framework aimed at enhancing ecological quality through stable international relations, increasing investment in renewable energy, and promoting economic liberalization in energy efficiency-related industries.","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"39 1","pages":""},"PeriodicalIF":6.1,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145094046","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}