Gondwana Research最新文献

{"title":"Tectonic evolution of the Proto-Paleo-Tethys in the West Kunlun orogenic belt: Constraints from U-Pb geochronology of detrital zircons","authors":"Yang Gao ,&nbsp;Lin Jiang ,&nbsp;Weiyan Chen ,&nbsp;Hongkui Dong ,&nbsp;Fujie Jiang ,&nbsp;Wen Zhao ,&nbsp;Yingqi Feng ,&nbsp;Liu Cao ,&nbsp;Xuanwei Liu","doi":"10.1016/j.gr.2025.02.010","DOIUrl":"10.1016/j.gr.2025.02.010","url":null,"abstract":"<div><div>The West Kunlun piedmont tectonic belt was formed by the collision and accretion of the West Kunlun orogenic belt and the Tarim Craton. Its sedimentary record captures the processes of basin-mountain interactions, making it an excellent region for studying the formation of orogenic belts and the evolutionary history of the Tethys Ocean. Despite extensive research on the geological evolution of the West Kunlun orogenic belt by previous scholars, there remains considerable uncertainty regarding the initiation and termination times of oceanic crust subduction to the eventual closure for both the Proto-Tethys Ocean and the Paleo-Tethys Ocean in this region, as well as the temporal continuity between these two processes. This study obtained 703 detrital zircons with concordant ages from 9 core samples of Devonian to Cretaceous sandstones from 5 wells in the West Kunlun piedmont tectonic belt. Additionally, published detrital zircon data from the surrounding areas of the West Kunlun orogenic belt were collected from other studies for comparative analysis. The results indicate that the provenance of the piedmont tectonic belt during the Permian and Cretaceous periods primarily originated from the adjacent South and North Kunlun terranes. In contrast, during the Jurassic period, the provenance shifted to the Tianshuihai terrane. We infer that this change in sediment source was related to the closure of the Paleo-Tethys Ocean in the Late Triassic. Synthesizing previous research on magmatic rocks in the West Kunlun region, we identified two discontinuous orogenic cycles within the West Kunlun orogenic belt, which span from the Proto-Tethys Ocean to the Paleo-Tethys Ocean: the 560 Ma-380 Ma Proto-Tethys orogenic cycle and the 340 Ma–190 Ma Paleo-Tethys orogenic cycle. There was a distinct hiatus between the two cycles, during which the subdued volcanic activity during a tectonically stable period resulted in a minimal zircon record.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"141 ","pages":"Pages 213-227"},"PeriodicalIF":7.2,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551944","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":"Elastic thickness and residual gravity anomaly applied to the northern Brazilian basins: Unravelling the volcanic-sedimentary history linked to the Central Atlantic Ocean opening","authors":"Gabriel Leal Rezende ,&nbsp;Afonso Cesar Rodrigues Nogueira ,&nbsp;Nelson de Lima Ribeiro-Filho ,&nbsp;Alexandre Ribeiro Cardoso ,&nbsp;Renato Sol Paiva de Medeiros ,&nbsp;Cristiano Mendel Martins ,&nbsp;Davis Carvalho de Oliveira","doi":"10.1016/j.gr.2025.02.015","DOIUrl":"10.1016/j.gr.2025.02.015","url":null,"abstract":"<div><div>The opening of the Central Atlantic Ocean during the Mesozoic caused voluminous outpouring of lava flows related to the Central Atlantic Magmatic Province (CAMP). Despite that, volcanic influence on the depositional evolution of northern Brazilian sedimentary basins is poorly-understood, as well as the interactions of volcanic and recurrent sedimentary deposits between lava flows. This region exhibits diverse magmatic expressions, including exclusively subsurface intrusions confined to the Amazonas and Solimões basins (Penatecaua magmatism) and lava spills, dykes, and sills interbedded with intertrap deposits (Mosquito Formation) in the Parnaíba Basin. In this context, forward gravity modeling was applied to derive residual gravity anomalies to better understand the emplacement and subsurface distribution of CAMP lithotypes. Crustal elastic thickness maps for the Amazonas, Solimões, and Parnaíba basins were constructed through cross-correlation of observed and modeled gravity signals. High values in the residual gravity maps are likely associated with volcanic rocks, enabling the reinterpretation of internal basin structures previously described to tectonic origins, such as the Monte Alegre Dome. The elastic thickness maps reveal a thinner crust in the Parnaíba Basin, closer to magma sources, which facilitated lava spills following magma accumulation along the basin’s western edge. This basin experienced three distinct magmatic pulses, interspersed with quiescent periods of subsidence and sedimentary deposition. In contrast, the Amazonas and Solimões basins exhibit thicker crusts, where magma was predominantly emplaced as sills, reaching up to 1 km in thickness. This is attributed to crustal densification and increased mechanical resistance. The heightened elastic resistance in the Amazonas and Solimões basins contributed to epeirogenic uplift and erosion of overlying sedimentary layers. Variations in crustal thickness and elastic resistance likely governed the styles and durations of magmatic activity, subsequently influencing the uplift or subsidence dynamics of the northern Brazilian basins.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"141 ","pages":"Pages 195-212"},"PeriodicalIF":7.2,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143547084","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":"Nature and tectonic setting of the Paleotethyan giant igneous belt in Southeast Asia","authors":"Xin Qian ,&nbsp;Shaojie Jin ,&nbsp;Yuejun Wang ,&nbsp;Peter A. Cawood ,&nbsp;Yongqi Yu ,&nbsp;Mongkol Udchachon ,&nbsp;Khairul Azlan Mustapha ,&nbsp;Thomas C. Sheldrick ,&nbsp;Yuzhi Zhang ,&nbsp;Chengshi Gan","doi":"10.1016/j.gr.2025.02.014","DOIUrl":"10.1016/j.gr.2025.02.014","url":null,"abstract":"<div><div>Southeast Asia provides a well-preserved magmatism record of the Late Paleozoic to Early Mesozoic history of subduction and consumption of the Paleotethyan Ocean and the resultant assembly of continental fragments. Abundant Late Paleozoic to Early Mesozoic igneous rocks, associated with the consumption of the Eastern Paleotethyan Ocean have formed the Lincang-Sukhothai-Chanthaburi-East Malaya giant igneous belt. However, the style of subduction, the timing and character of initial collision, and related magmatic dynamic processes remain a source of contention. In this paper, we present a synthesis of geochronological, geochemical, and Sr–Nd–Pb–Hf–O isotopic studies based on the latest Carboniferous–Triassic igneous rock associations from the Eastern and Central Granite Provinces, and from the Permian–Triassic volcanic zones of this giant igneous belt and surrounding areas. Our comprehensive study, along with regional distributions and geological observations suggests that the Paleotethyan subduction began at the Late Carboniferous (ca. 315 Ma) and continued until the Middle Triassic (ca. 240 Ma). Inferred slab roll-back initially began after ca. 270 Ma and subsequently formed granitoids along the Eastern Province and rift-related igneous rocks. The tectonic transition from subduction to initial continental collision between the Sibumasu and Indochina-East Malaya began at ca. 237 Ma, resulting in partial melting of middle-lower crust to form the high-silica volcanic rocks and <em>syn</em>-collisional granitic intrusions. Subsequent slab detachment triggered the asthenospheric upwelling to form the linearly distributed mafic-felsic igneous rocks along the Lancangjiang-Chiang Khong-Lampang-Tak volcanic zone and Eastern Province at ca. 230 Ma. Finally, gravitational collapse of the orogenic belt occurred during the Late Triassic (230–200 Ma) with the main phase at ca. 220 Ma, forming the Central Province. The Eastern Paleotethyan orogen terminated at ca. 200 Ma.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"141 ","pages":"Pages 228-245"},"PeriodicalIF":7.2,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579012","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":"Uncertainty and diversification: Analyzing the impact of energy-related and climate policy uncertainties on environmental degradation in the United States","authors":"Veli Yilanci ,&nbsp;Uğur Ursavaş ,&nbsp;Iftikhar Yasin","doi":"10.1016/j.gr.2025.02.017","DOIUrl":"10.1016/j.gr.2025.02.017","url":null,"abstract":"<div><div>This study examines the complex relationship between environmental degradation, energy-related uncertainty (EUI), climate policy uncertainty (CPU), and energy consumption diversification (ECD) in the United States from January 2001 to September 2022. Employing novel and robust econometric methods, including the Bootstrap ARDL Bounds test with smooth and sharp structural breaks, the Toda-Yamamoto causality test with a Fourier function, and partial wavelet coherency analysis, the study reveals a surprising negative relationship between both EUI and CPU with CO₂ emissions which suggests that uncertainties surrounding energy and climate policies may incentivize actors to adopt cleaner technologies and prioritize emission reduction strategies. However, the study also identifies a positive relationship between ECD and CO₂ emissions, highlighting the need for strategic diversification prioritizing renewable and low-carbon sources. These findings emphasize the critical role of clear, consistent, and sustained climate policies in fostering clean energy investment and mitigating environmental degradation.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"141 ","pages":"Pages 149-163"},"PeriodicalIF":7.2,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143528784","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":"Counterclockwise P-T-t path, cyclic crustal anatexis and magmatic tempo in accretionary orogens: A case study in the Devonian arc of Central Patagonia, Argentina","authors":"Emiliano M. Renda ,&nbsp;Paulo Marcos ,&nbsp;Sebastian Oriolo ,&nbsp;Benita Putlitz ,&nbsp;Lukas Baumgartner ,&nbsp;Pablo González ,&nbsp;Michelle L. Foley ,&nbsp;Victor Ruiz González ,&nbsp;Haroldo Vizán","doi":"10.1016/j.gr.2025.02.011","DOIUrl":"10.1016/j.gr.2025.02.011","url":null,"abstract":"<div><div>An intriguing aspect of accretionary orogen dynamics is the crustal growth of the West Gondwana margin throughout the Terra Australis Orogeny, particularly regarding the development of the Patagonian crust and whether it involved periods of collisional or non-collisional orogenesis. This study examines the Devonian tectono-thermal evolution of the western North Patagonian Massif (southern South America), through the investigation of high-grade metamorphic rocks associated with the Devonian arc of Central Patagonia. Phase equilibrium modelling and geothermobarometry indicate an initial MP-HT metamorphic event (M1) under contractional conditions at the amphibolite- to granulite-facies transition, with metamorphic conditions of 6.7 ± 1 Kbar and ∼ 760 °C, previously dated at 379 ± 5 Ma. Successive crustal thickening and associated anatexis are recorded by metamorphic conditions at 8.9 ± 1 Kbar and ∼ 750 °C. Zircon U-Pb geochronology indicates leucosome crystallization at 360 ± 2 Ma, while an associated megacrystic granite records a 368 ± 2 Ma crystallization age, suggesting it represents an earlier magmatic pulse within the prolonged anatectic scenario. Decompression and cooling led to zircon crystallization near the solidus, marking an MP-MT (M₂) metamorphic event at amphibolite facies conditions  (∼ 6.5 Kbar and 620 °C), recorded by zircon ages of 353 ± 2 Ma. A final retrograde metamorphic event (M₃) is recorded at ∼ 660 °C and ∼ 4.6 Kbar with monazite ages of 323 ± 5 Ma. This event is linked to decompression and intrusion of gondwanide magmatism. These metamorphic conditions reveals an overall counterclockwise P-T-t path for the Taquetren range from the Devonian to Carboniferous. Combined with the study of magmatic addition rates in the arc and forearc during the Devonian, this pattern supports an accretionary orogen model characterized by alternating periods of advancing and retreating subduction, potentially driven by trenchward and landward slab folding, which may account for short-cycle variation (∼15 Myr). These dynamic slab movements may have influenced variations in magmatic activity in the forearc and arc, coupled with shifts in metamorphic conditions and tectonic regimes.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"141 ","pages":"Pages 310-331"},"PeriodicalIF":7.2,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619410","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":"Jurassic picritic and potassic mafic dyke swarms in eastern China: Evidence for thermal erosion of the lithospheric mantle during Paleo-Pacific subduction","authors":"Wenjia Wang ,&nbsp;Shuguang Song ,&nbsp;Chao Wang ,&nbsp;Mark B. Allen ,&nbsp;Lifei Zhang ,&nbsp;Xiaowei Li ,&nbsp;Li Su","doi":"10.1016/j.gr.2025.02.012","DOIUrl":"10.1016/j.gr.2025.02.012","url":null,"abstract":"<div><div>Paleo-Pacific subduction significantly impacted the structure and nature of the mantle in Eastern China. However, the thermal structure of the supra-subduction-zone mantle during the early stage of the Paleo-Pacific subduction has not been well constrained. Here, we present an integrated study involving field investigation, petrology, and geochemistry on two types of Jurassic (168–155 Ma) mafic dyke swarms in Western Liaoning, North China Craton (NCC), to trace the properties of the NCC mantle during the Jurassic. The picritic dyke swarms, trending NNW (330°–350°), show OIB-like geochemical signatures, with high mantle potential temperatures (Tp) ranging from 1498 ± 52°C to 1535 ± 56°C. These picritic dyke swarms are derived from high-degree of partial melting of the asthenospheric mantle by a hot and hydrous asthenospheric melts rising from the mantle transition zone above the subducted slab. In contrast, the Jurassic potassic mafic dyke swarms, trending NNW (325°–345°), were formed by partial melting of the metasomatized lithospheric mantle during the upwelling of the asthenospheric melts. We conclude that thermal erosion would be a major factor in the destruction of the lithospheric mantle beneath the NCC in the early stage of the Paleo-Pacific plate subduction.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"141 ","pages":"Pages 135-148"},"PeriodicalIF":7.2,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143518931","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":"Retrieving petrogenetic source, compositional diversity and tectono-magmatic scenario of Tethyan sediment-derived magmatic flare-up: A tale from petrochemical and multi-isotopic (Sr–Nd–B–Hf) systematics","authors":"Tehseen Zafar ,&nbsp;Shuguang Song ,&nbsp;Hafiz Ur Rehman ,&nbsp;Hamed Gamaleldien ,&nbsp;Abiola Oyebamiji ,&nbsp;Zaheen Ullah ,&nbsp;Umar Farooq Jadoon ,&nbsp;Muhammad Farhan ,&nbsp;Mohamed Zaki Khedr ,&nbsp;Irfan Maqbool Bhat ,&nbsp;Fatemeh Sepidbar ,&nbsp;Fatemeh Nouri ,&nbsp;Amjad Hussain ,&nbsp;Zahid Hussain ,&nbsp;Mabrouk Sami","doi":"10.1016/j.gr.2025.02.013","DOIUrl":"10.1016/j.gr.2025.02.013","url":null,"abstract":"<div><div>The Earth’s continental crust is predominantly composed of granitic rocks, yet the genesis of pure sediment-derived peraluminous granites (PGs) remains debated. This study investigates the Ordovician Mansehra granitic suite (ca. 476–483 Ma) from the northwestern Himalayas of Pakistan as an example of S-type granites, comparing them with global counterparts from Diancangshan-Ailaoshan (China), Tanggula-Damxung (Tibet), and Karamese (Turkey). Geochemical and isotopic data, including variable zircon εHf(t) values (−37.7 to + 12.6), enriched Sr isotope ratios ((⁸⁷Sr/⁸⁶Sr)i: 0.5678–0.7444), negative εNd(t) values (−13.4 to − 2.9), and a narrow δ¹¹B range (−15.4 ‰ to − 9.5 ‰), indicate that PGs formed through partial melting of heterogeneous, mature pelitic sources under shallow, low-pressure conditions in the lower–upper crust, with minimal mantle input. Heterogeneous Hf isotopic behavior reflects the disequilibrium melting of variable metasedimentary protoliths. Geochemical modeling highlights fluid-flux melting as the dominant process, except for the Tanggula granites, which exhibit characteristics of fluid-absent melting. Tectonically, the Mansehra PGs are interpreted as products of Proto-Tethyan oceanic subduction beneath northern Gondwana, formed through the disequilibrium melting of exhumed back-arc basin sediments. Slab break-off likely triggered asthenospheric upwelling, enhancing heat flux and driving anatexis and PG production. While global PGs represent different geodynamic evolutionary contexts, they predominantly display significant tectonic events rather than direct contributions to crustal growth. The Mansehra PGs, along with similar granites, record large-scale anatexis linked to collisional tectonics, providing critical insights into Earth’s geodynamic evolution.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"141 ","pages":"Pages 164-179"},"PeriodicalIF":7.2,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143547083","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":"Carboniferous-Permian magmatism in western section of the North Qaidam, northern Tibet Plateau: Response to the spatio-temporal evolution of the Paleo-Tethys Ocean","authors":"Panlong Wang ,&nbsp;Yongjun Li ,&nbsp;Yujun Zhuang ,&nbsp;Pingyang Gu ,&nbsp;Gaoxue Yang ,&nbsp;Fenghao Duan ,&nbsp;Jianye Zhang ,&nbsp;Wei Li ,&nbsp;Nanhe Peng ,&nbsp;Qian Wang ,&nbsp;Hai Li","doi":"10.1016/j.gr.2025.02.007","DOIUrl":"10.1016/j.gr.2025.02.007","url":null,"abstract":"<div><div>The origin of Late Paleozoic igneous rocks in the North Qaidam (NQ) remains controversial. This study presents comprehensive geochronological, geochemical, and isotopic data on the igneous rocks in western section of the NQ. The chronological results indicate that the Yanchangbeishan (YC) hornblende gabbro was formed at <em>ca.</em> 254 Ma; the Xiaosaishitengshan (XS) gabbro, biotite quartz-diorite, monzogranite, and andesite were formed at <em>ca.</em> 318 Ma, <em>ca.</em> 259 Ma, <em>ca.</em> 252 Ma, and <em>ca.</em> 271 Ma, respectively; and the Dasaishitengshan (DS) gabbro, tonalite, and biotite monzogranite were formed at <em>ca.</em> 268 Ma, <em>ca.</em> 272 Ma, and <em>ca.</em> 282 Ma, respectively. The Lu-Hf isotopic results show that the ε_Hf(t) values of YC hornblende gabbro, XS andesite, and DS gabbro and tonalite are + 1.21 to + 9.53, +9.01 to + 15.70, +0.05 to + 4.71, and − 5.43 to − 1.93, respectively. Among them, XS gabbro (high-alumina) and andesite, and YC gabbro (high-magnesium) exhibit significant depletions in Nb, Ta, and Ti, similar to island arc magmas, which formed by partial melting of depleted lithospheric mantle metasomatized by slab fluids to varying degrees. DS gabbro (high-Nb) shows slight depletions in Nb, Ta, and Ti, resembling intraplate rift basic rocks, and resulting from low-degree partial melting of depleted mantle wedge metasomatized by slab melts. XS biotite quartz-diorite, monzogranite, and DS biotite monzogranite have high SiO₂ (63.69–76.85 wt%) contents and low Mg^# values (28–43), classified as I-type granites, formed by partial melting of juvenile crust. DS tonalite (high Ba-Sr) shows depletions in Nb, Ta, and Ti, originating from the lithospheric mantle metasomatized by slab-derived fluids and undergoing extensive fractional crystallization. By integrating the results of this study with published work regarding the igneous rocks in the NQ, we propose a new tectonic evolution model involving Zongwulong Paleo-Tethys Ocean subduction slab roll-back and subduction zone retreat for the Late Paleozoic in the NQ.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"141 ","pages":"Pages 265-288"},"PeriodicalIF":7.2,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610711","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":"Decoding cycling and enrichment of boron and associated lithium in waters of the Tibetan Plateau with boron isotopes","authors":"Yu Zhang ,&nbsp;Hongbing Tan ,&nbsp;Zhiwei Shi ,&nbsp;Fei Xue ,&nbsp;Xiying Zhang ,&nbsp;Huiying Ma","doi":"10.1016/j.gr.2025.02.006","DOIUrl":"10.1016/j.gr.2025.02.006","url":null,"abstract":"<div><div>The Tibetan Plateau (TP), which has various water bodies exhibiting extreme enrichment of boron (B), lithium (Li) and other elements, is a unique and cost-effective supplier of B and Li globally. However, the sources and enrichment mechanisms of these elements remain disputed. Herein, big data on B isotopes and geochemistry were compiled to reveal cycling and enrichment of B and associated Li in the complex mountain-basin systems of the TP. Various water bodies on the TP show remarkably high B and Li concentrations compared with the global average levels. B and Li are supernormally enriched or even mineralized in some salt lakes, oilfield brines, and geothermal systems. Water with high B concentrations exhibits simultaneous ¹¹B depletion. The spatial patterns of B-Li concentrations and δ¹¹B values are characterized by a westward increase and a southward decrease, respectively. The mechanisms of B and Li cycling and enrichment, from source to sink, on the TP can be summarized as follows: 1) Slab subduction and following continental collisions induced partial melting of the mid-lower crust, resulting in late-stage highly differentiated crust-derived magma upwelling and invasion into the mid-upper crust. Hot springs thereby maintain an efficient release of abnormally abundant B and Li from magmatic fluids to the surface through deep geothermal circulation. 2) In the eastern and southeastern TP, Massive degassing of mantle fractions prevails along large strike-slip faults. B and Li enriched from mantle- or crust-derived fluids can reach the surface via local volcanism. 3) Water-rock interaction and weathering trigger further activation, mobilization, and enrichment of B and Li in water. The aforementioned geological processes supply constantly deep-source B and Li to rivers and groundwater as cold-hot springs. Eventually, B and Li are fed into the lake basin jointly with supergene processes; after prolonged evaporation-concentration, excellent B-Li-rich salt lake resources are formed.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"141 ","pages":"Pages 120-134"},"PeriodicalIF":7.2,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437595","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":"A review of Mesozoic geodynamic evolution of the North Makran (SE Iran): A tale of a Neo-Tethyan ocean vanished due to two coexisting subduction zones","authors":"Edoardo Barbero ,&nbsp;Luca Pandolfi ,&nbsp;Morteza Delavari ,&nbsp;Asghar Dolati ,&nbsp;Emilio Saccani ,&nbsp;Maria Di Rosa ,&nbsp;Michele Marroni","doi":"10.1016/j.gr.2025.01.016","DOIUrl":"10.1016/j.gr.2025.01.016","url":null,"abstract":"<div><div>This paper presents a synthesis of the geological features of each tectonic unit of the North Makran (SE Iran), integrating results of multidisciplinary analyses, including structural and stratigraphic studies, petrographic and geochemical analyses, thermobarometric studies, as well as biostratigraphic and geochronological dating. This wealth of data forms the basis for a novel geodynamic model of the Jurassic − Eocene evolution of the Neo-Tethys realm, which evolved between the Arabian Plate and the Lut Block. The features of the North Makran tectonic units support the existence of a mid-ocean ridge setting during the Jurassic – Early Cretaceous. Contrary to previous interpretations, the data from these tectonic units suggests a single oceanic basin separating the Arabian and Lut continental margins, without the interposition of a microcontinental block. In the Early Cretaceous, subduction initiation is recorded by volcanic arc assemblages accommodating the convergence between the Arabian Plate and Lut Block. The nucleation of an intra-oceanic subduction marked the separation of the North Makran Ocean from the Neo-Tethys. The Late Cretaceous was characterized by plume-related magmatism and the onset of the convergence in the North Makran Ocean, inducing its subduction beneath the Lut Block. This subduction is recorded by volcanic arc assemblage and high pressure and low-temperature metamorphism within a subduction complex. Meanwhile, intra-oceanic subduction persisted within the Neo-Tethys, accompanied by a subduction complex and arc magmatism. The final closure of the North Makran Ocean occurred during the Late Cretaceous –Late Paleocene with the progressive amalgamation of the two subduction complexes and the deformation of the interposing oceanic lithosphere. This study suggests that the subduction of a seamount chain in the North Makran Ocean played a key role in the shortening and closure of this basin. This research emphasizes the importance of considering multiple factors in understanding the tectonic evolution of the Neo-Tethys realm.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"141 ","pages":"Pages 74-101"},"PeriodicalIF":7.2,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420499","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}