Journal of Asian Earth Sciences最新文献

{"title":"The significance of the high-amplitude magnetic anomaly belt in the seismotectonics of mid-west Taiwan","authors":"Wen-Bin Doo ,&nbsp;Yin-Sheng Huang ,&nbsp;Wen-Nan Wu ,&nbsp;Ching-Yu Cheng ,&nbsp;Chung-Liang Lo ,&nbsp;Hsueh-Fen Wang ,&nbsp;Shiou-Ya Wang ,&nbsp;Yin-Tung Yen","doi":"10.1016/j.jseaes.2025.106598","DOIUrl":"10.1016/j.jseaes.2025.106598","url":null,"abstract":"<div><div>In mid-west Taiwan, there is a unique zone with high crustal magnetization called Lukang Magnetization High (LMH), which is believed to significantly influence earthquake activity in middle Taiwan. According to the magnetic anomaly feature in the Taiwan region, the LMH is the inversion result of the eastern part of the high-amplitude magnetic anomaly zone (NSCSMA) found in the northern South China Sea continental margin. To better understand the connection between this magnetic high (HMAZ) and background tectonic features, this study analyzes the magnetic data in mid-west Taiwan. We used wavelet spectrum analysis and compact inversion techniques to determine its causal source. Wavelet spectrum analysis results show that the wavelength of the major magnetic signal of the HMAZ is 180 km, indicating the source depth of approximately 25 km. The compact inversion results reveal high-susceptibility materials distributed around 20–30 km depth. P-wave velocity models suggest that the causal source of the HMAZ could be located in the lower crust and/or upper mantle and belong to the Eurasia plate. Based on the previous analysis results of the NSCSMA and our observation, we propose that the serpentinized materials may be the causal source of the HMAZ. Moreover, based on the regional seismicity characteristics, our findings indicate that the deformation front plays a more crucial role in the seismotectonic of mid-west Taiwan than the HMAZ.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"288 ","pages":"Article 106598"},"PeriodicalIF":2.7,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143816213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biodiversity and paleoenvironments of vertebrate-rich Eocene marine deposits (Lutetian) of the tropical western Neotethys: New insights from the Arabian Platform","authors":"M. Deville de Periere ,&nbsp;Guillaume Guinot ,&nbsp;Sylvain Adnet ,&nbsp;Sylvia Riechelmann ,&nbsp;Alison Murray ,&nbsp;Didier Merle ,&nbsp;Christian Cesari ,&nbsp;Chris Reid ,&nbsp;Mohammed Sadah","doi":"10.1016/j.jseaes.2025.106604","DOIUrl":"10.1016/j.jseaes.2025.106604","url":null,"abstract":"<div><div>The Eocene deposits of Saudi Arabia (Dammam Formation) are characterized by intertidal to shallow marine carbonate rocks interbedded with meter-scale shale members (Midra and Saila shales). The latter are dated from the middle Eocene and include large numbers of marine vertebrates, dominated by elasmobranch (sharks, skates, and rays) teeth. The rich fossil assemblage comprises at least 13 elasmobranch taxa (including 8 different sharks and 3 batomorph taxa) and at least 7 bony fish taxa. This assemblage is described for the first time from the Arabian Platform (western margin of the Neotethys) and is critically important to understand the changes in circum Tethyan marine biotas during the Eocene. The larger elasmobranchs are dominated by lamniform sharks, such as “<em>Carcharias” koerti</em>, <em>Brachycarcharias</em> cf. <em>lerichei</em> and <em>Striatolamia</em> cf. <em>macrota</em>, along with the tiger shark <em>Galeocerdo eaglesomei</em>, the hammerhead shark <em>Sphyrna</em> sp., and myliobatoids. Teleost fishes appear less diversified in the area and are dominated by <em>Eotrigonodon</em> and <em>Pycnodus</em> species. A low-diversity benthic fauna including bivalves, gastropods, echinoids and corals was found along with the neritic elasmobranch and teleost taxa. The fish assemblage found in the present study is consistent with other middle Eocene faunas worldwide, especially in the tropical Neotethys seaway. Biostratigraphic analyses and strontium isotope ratio measurements from tooth enameloid confirm a Lutetian age (possibly refined to mid-Lutetian). The variety of taxa recovered in Saudi Arabia enables a preliminary reconstruction of the likely interactions between the various fossil groups and their broad paleoenvironments. Apex predators characterized by large lamniform and carcharhiniform sharks probably hunted in shallow near shore waters, where other fish (including eagle rays, carpet sharks, sawfish, and bony fish) were dwelling.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"288 ","pages":"Article 106604"},"PeriodicalIF":2.7,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143816288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Contributions of thermoelastic strain to apparent annual variations in four-component borehole strain: A case study from Gaotai station in the NE margin of the Tibetan Plateau","authors":"Xiaolin Yang ,&nbsp;Jinling Yang ,&nbsp;Hang Li ,&nbsp;Jun Wang","doi":"10.1016/j.jseaes.2025.106600","DOIUrl":"10.1016/j.jseaes.2025.106600","url":null,"abstract":"<div><div>Clarifying the physical mechanisms underlying near-surface annual deformation remains a major challenge in crustal dynamics research. For the four-component borehole strain observation networks in mainland China, a few stations are apparently dominated by annual fluctuations. However, only a limited number of specific studies have been carried out to dynamically assess the physical characteristics of these signals. Considering the fact that atmospheric temperature is a major factor inducing annual variations in crustal deformation, the Gaotai station was thus selected as a typical example diagnosis and a half-space model with a decoupling layer was used to quantitatively assess the thermo-effects of annual atmospheric temperature variation on the four-component borehole strain. The results show that an annual temperature variation with amplitude of 16.60 ℃ can induce a theoretical thermal strain of the 10^-6 magnitude at a borehole depth of 44.97 m; additionally, both amplitude and phase of the modeled values closely align with the measured strain time series, suggesting that the annual variation signal of the four-component borehole strain recorded at Gaotai station mainly originates from the annual atmospheric temperature changes. This geodynamical investigation can help to quantitatively elucidate the annual variation mechanism of the multi-component borehole strain and advance our understanding of thermo-deformation processes in shallow crust.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"288 ","pages":"Article 106600"},"PeriodicalIF":2.7,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Insights into tectonic lineaments patterns and crustal architectures beneath the Carlsberg Ridge: Implications for mineral exploration","authors":"Satya Narayan","doi":"10.1016/j.jseaes.2025.106602","DOIUrl":"10.1016/j.jseaes.2025.106602","url":null,"abstract":"<div><div>This study focuses on the Carlsberg Ridge’s complex geological structures, characterized by rugged topography, seismicity, and significant hydrothermal activity, which have led to the deposition of economically valuable sulfide minerals. Using an integrated geophysical approach, including gravity data analysis, lineament mapping, Euler depth estimation, seismicity analysis, and spectral depth examination, we investigate the structural and crustal architecture beneath the Carlsberg Ridge. The analysis utilizes high-resolution GECO global gravity models, to generate detailed subsurface images. A comparative study of GECO-derived and shipborne Free-air gravity data shows strong agreement, with higher correlation and lower RMS error. The study also employs the regional-residual gravity separation, edge enhancement filters, and Euler deconvolution method, which aid in identifying mineralization zones and active/inactive vent sites conducive to mineral accumulation. Results indicate topographic and gravity anomalies linked to shallow-to-moderate depth discontinuities, active tectonics, hydrothermal venting, and mineralization processes. Identified zones shows high lineament density, moderate crustal thickness, and shallower Moho depths. The THVH technique delineated faults and fractures with dominant orientations of NE-SW, NW-SE, ENE-WSW, N-S, and E-W directions, respectively. Seismic events along the ridge axis, with focal depths of 9.0–10.5 km and magnitudes of 4.0–5.9 Mb, correlate with these zones. Mineralized areas align with high seismicity, shallow crustal features, and hydrothermal vent activity. These findings emphasize the Carlsberg Ridge’s potential for deep-sea mineral exploration, offering valuable insights into seafloor mineralization processes. This study provides a foundation for future geophysical and geochemical surveys in mid-oceanic ridge environments.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"288 ","pages":"Article 106602"},"PeriodicalIF":2.7,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143799257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rift-related explosive volcanism on the eve of the Cambrian ‘explosion’ on the Olenek Uplift (northeastern margin of Siberian Craton)","authors":"Ivan F. Chayka ,&nbsp;Olga P. Izokh ,&nbsp;Vladimir I. Rogov ,&nbsp;Evgeny V. Vinogradov ,&nbsp;Elena A. Vasyukova ,&nbsp;Boris M. Lobastov ,&nbsp;Sergey N. Rudnev ,&nbsp;Andrey E. Izokh ,&nbsp;Dmitriy V. Grazhdankin","doi":"10.1016/j.jseaes.2025.106592","DOIUrl":"10.1016/j.jseaes.2025.106592","url":null,"abstract":"<div><div>Igneous occurrences comprising stratiform volcanic breccia, diatremes, basalt flows and feeders, and dolerite sills exhibit structural relationships with the Ediacaran–Cambrian boundary strata on the Olenek Uplift (northeastern Siberian Craton). A U-Pb date of 543.9 ± 0.24 Ma for zircons from the volcaniclastics (<span><span>Bowring et al., 1993</span></span>) had been considered as the age of the magmatic complex and used to constraint the Ediacaran-Cambrian boundary. We conducted a multifaceted study of this complex shedding additional light on its classification, petrology, tectonics and emplacement regime. We distinguish between basic and high-potassic rock varieties and attribute this diversity to a <em>syn</em>-emplacement overprint by K⁺-bearing sedimentary brines. All the rocks are co-magmatic, originated from a mantle-derived alkali-basaltic melt, and constitute a single event herein formally described as the Tas-Yuryakh complex. Its parental melt supposedly originated via 15–20 % melting of a garnet lherzolite at 65–70 km depth due to reaction of a plume with moderately enriched lithospheric mantle at the passive continental margin. These data combined with the geological evidence corroborate an earlier conclusion that the Tas-Yuryakh complex together with the adjacent Kharaulakh occurrence mark a rift structure that existed at ∼ 540 Ma in an ocean basin between Siberia and Baltica. The volcanic events took place over &gt; 600 km² in shallow-depth coastal settings over a drowned carstified carbonate platform. The reaction of the hot magma with seawater and underground brines could have released a substantial mass of halogen- and boron-bearing compounds into the water and atmosphere affecting local environment and biota.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"288 ","pages":"Article 106592"},"PeriodicalIF":2.7,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143816212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Origin of chromitites and dunites of the Dazhuqu ophiolite in the Yarlung-Zangbo ophiolite zone, Tibet","authors":"Yu-Wei She ,&nbsp;Fa-Hui Xiong ,&nbsp;Qiu-Hong Xie","doi":"10.1016/j.jseaes.2025.106609","DOIUrl":"10.1016/j.jseaes.2025.106609","url":null,"abstract":"<div><div>The origin of chromitites in ophiolites remains a topic of debate. The Dazhuqu ophiolitic massif located in the central segment of the Yarlung-Zangbo ophiolite zone contains podiform chromitites. The massive chromitites exhibit significantly low Cr# (38–47) in chromite. In contrast, the disseminated chromitites have relatively wide range of Cr# (16–64) in chromite. The dunites can be classified into two group: low-Cr# chromite-bearing dunites (Cr# = 19–51) and high-Cr# chromite-bearing dunites (Cr# = 74–83). The chromite of harzburgites show similar Cr# range (27–55) to that of the disseminated chromitites and low-Cr# chromite-bearing dunites. The negative correlation between Ti and Cr# along with the positive correlation between Ni and Mg# in chromite suggests that the massive chromitites formed through the physical sorting and accumulation of chromite grains in the melt conduits. The compositional patterns of chromite in the disseminated chromitites and low-Cr# chromite-bearing dunites resemble those of the harzburgites, implying that their chromite may have inherited compositional signatures from the surrounding harzburgites. In contrast, the chromite in the high-Cr# chromite-bearing dunites exhibits compositional patterns associated with boninitic melts. The coexistence of the chromitites and dunites with lower Cr# of chromite and high-Cr# chromite-bearing dunites indicate that the Dazhuqu massif was once modified by both MORB-like and boninitic melts, causing highly variable Cr# of chromite. A model of subduction initiation accounts for the magmatic evolutionary history of the chromitites and mantle sequence of the Dazhuqu massif.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"289 ","pages":"Article 106609"},"PeriodicalIF":2.7,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In3+-Cl− complexation in hydrothermal fluids: Insights from ab initio deep potential molecular dynamics","authors":"Wei Zhang ,&nbsp;Yuanjia Huang ,&nbsp;Li Zhou","doi":"10.1016/j.jseaes.2025.106605","DOIUrl":"10.1016/j.jseaes.2025.106605","url":null,"abstract":"<div><div>Given the rising global demand for indium (In) in electronic devices, research has increasingly focused on its natural mineralogy. The transportation and enrichment of indium are primarily driven by magmatic-hydrothermal processes. However, the speciation of In³⁺ in hydrothermal fluids remains poorly understood. This study developed a first-principle-based deep potential model for the InCl₃-H₂O system aimed to investigate the species of In-Cl complexes. The dissociation pathways of In³⁺-Cl⁻ complexes and the corresponding association constants (log<em>K</em>) for <span><math><mrow><mtext>In</mtext><mtext>C</mtext><msubsup><mtext>l</mtext><mrow><mtext>n</mtext></mrow><mrow><mtext>3-</mtext><mtext>n</mtext></mrow></msubsup><mtext>(</mtext><mtext>n = 1</mtext><mtext>-</mtext><mtext>4</mtext><mtext>)</mtext></mrow></math></span> were investigated via deep potential molecular dynamic simulations (DPMD). These new thermodynamic properties provide the first dataset on <span><math><mrow><mtext>In</mtext><mtext>C</mtext><msubsup><mtext>l</mtext><mrow><mtext>n</mtext></mrow><mrow><mtext>3-</mtext><mtext>n</mtext></mrow></msubsup><mtext>(</mtext><mtext>n = 1</mtext><mtext>-</mtext><mtext>4</mtext><mtext>)</mtext></mrow></math></span> dissociation in high P-T fluids (up to 800 °C and 50 kbar). The Helgeson-Kirkham-Flowers (HKF) parameters for In-Cl complexes were fitted with our DPMD derived log<em>K</em> for In-Cl complexes, which can be serves as a pioneering framework for understanding the stability and speciation of In-Cl complexes in hydrothermal fluids, particularly in the absence of current experimental data. Thermodynamic modeling reveals that In³⁺ has a strong chemical affinity for Cl<strong>⁻</strong>, with high-order In-Cl complexes (InCl₃ and InCl₄^-) playing a critical role in indium transport. Notably, InCl₄^- becomes the predominant species in a very low NaCl concentration (&lt; 1 wt%). Its chemical affinity for Cl<strong>⁻</strong> is stronger than Sn²⁺, and the chemical-physical conditions that favor Sn²⁺-Cl^- complex transportation are equally conducive to indium, resulting in their co-transport when they share the same source. Indium and zinc exhibit similar speciation in hydrothermal fluids, which may advantageously promote the substitution of indium into sphalerite.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"288 ","pages":"Article 106605"},"PeriodicalIF":2.7,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143791274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Three groups of arthropods (Chasmataspidida, Offacolidae (?), and Euthycarcinoidea) cohabited a tidal zone in the late Cambrian paleobasins (495–488 Ma) of Eastern Siberia","authors":"Elena Naimark ,&nbsp;Alexander Sizov","doi":"10.1016/j.jseaes.2025.106595","DOIUrl":"10.1016/j.jseaes.2025.106595","url":null,"abstract":"<div><div>We examined arthropods from a newly discovered location, Kimiltei, in the Irkutsk region of Eastern Siberia. These arthropods belong to three distinct groups: basal euchelicerate (putative Offacolidae), Chasmataspidida, and Euthycarcinoidea. They were found together in a single bed. Chemical, mineralogical, and facial analyses revealed that this bed was formed within a very shallow lagoonal/tidal environment with nearby paleosols. Using the combined data, we present a taphonomic model explaining the uncompressed, three-dimensional preservation of the arthropods. Based on U-Pb isotopic dating of detrital zircon grains, we determined the age of this bed as 491.3 ± 4.2 Ma, placing it in the Furongian Series (Jiangshanian and Stage 10). Given this age, the arthropods from Kimiltei appear to be among the earliest known body fossils of Euthycarcinoidea and euchelicerates. An updated analysis of the geographical distribution of these groups indicate<del>s</del> that by the late Cambrian, Euthycarcinoidea already had a wide distribution in tropical and possibly boreal regions of the Iapetus Ocean, while euchelicerates inhabited a tropical Siberian paleobasin. The evolution of these groups proceeded at the beginning in close ecological niches in a tidal zone.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"289 ","pages":"Article 106595"},"PeriodicalIF":2.7,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143800244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Age, kinematics, and magnitude of the last surface rupturing event along the central Pambak-Sevan-Syunik fault (Armenia): Probable implications for landslides and lake tsunamis","authors":"Ara Avagyan ,&nbsp;Jean-Francois Ritz ,&nbsp;Seda Avagyan ,&nbsp;Gagik Alaverdyan ,&nbsp;Anastasia Arzhannikova ,&nbsp;Sergey Arzhannikov ,&nbsp;Lilit Sahakyan ,&nbsp;Tigran Armenyan ,&nbsp;Farkhod Hakimov ,&nbsp;Ruben Badalyan","doi":"10.1016/j.jseaes.2025.106603","DOIUrl":"10.1016/j.jseaes.2025.106603","url":null,"abstract":"<div><div>The Lesser Caucasus region is located in the northern part of the Armenian Highland, within the active Arabia-Eurasian collision zone. Numerous and various geological hazards, such as large earthquakes can be observed in this region. They can reach M7^± magnitude inducing surface ruptures and strong ground shaking that in turn can trigger landslides and liquefaction phenomena. One of the most important sources of earthquakes is the Pambak-Sevan-Syunik fault (PSSF), which crosses the entire Armenian territory including Lake Sevan with population estimated at 280,000 around it. In this work, we conducted a paleoseismological study along the Vanadzor-Artanish segment of the PSSF, on the northern shore of the Lake Sevan. Our findings indicate that this fault produced a M_w 7.2 earthquake between 901 and 2333 cal. BC resulting in a surface rupture of at least 22 km and a vertical displacement component of approximately 2 m. Based on our observations, this large earthquake most likely triggered associated phenomena such as landslides and a lake tsunami. These new results demonstrate that characterizing the paleoseismology of active faults in mountainous regions, especially in densely populated areas like Armenia, must be combined with the analysis of potential associated phenomena to provide a complete geohazards assessment.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"288 ","pages":"Article 106603"},"PeriodicalIF":2.7,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143791273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Apatite-bearing mantle xenoliths in Early Cretaceous basalts: Implications for geochemical modifications and carbon cycling in eastern North China Craton","authors":"Nongxin Yuan ,&nbsp;Cheng Xu ,&nbsp;Zhuoqi Li","doi":"10.1016/j.jseaes.2025.106596","DOIUrl":"10.1016/j.jseaes.2025.106596","url":null,"abstract":"<div><div>The eastern North China Craton (NCC) has undergone multistage lithospheric modifications through the recycling of subducted crustal materials. However, the mechanisms underlying the formation of carbon-rich domains in the subcontinental lithospheric mantle during the Late Mesozoic evolution remain poorly understood. Here, we report the petrological and in-situ geochemical characteristics of apatite-bearing mantle xenoliths from the Early Cretaceous Fangcheng basalts. The presence of near-equilibrium fluorapatites with olivines and clinopyroxenes along with a high proportion of clinopyroxenes and abundant CO₂ fluid inclusions in the wehrlites and olivine clinopyroxenites indicates the occurrence of carbonatite metasomatism. The geochemical compositions of the apatites show relatively high abundances of F (∼2.78 wt%) and Sr (∼3842 ppm), low Sr/Y (&lt;52) and high (La/Yb)_N (∼215) ratios, resembling apatite crystallizing from carbonatite magmas. Clinopyroxenes exhibit low Al and Ti concentrations and are characterized by low Ti/Eu ratio (517–1867) and high (La/Yb)_N (13–15) and Ca/Al ratios (7–9), consistent with geochemical trends associated with carbonatite metasomatism. Elevated Li concentration (&gt;3 ppm) and low V/Sc ratio (&lt;3) in olivines suggest the contribution of recycled crustal components to the peridotitic lithosphere. Additionally, highly enriched Sr-Nd isotopes reported in the Fangcheng basalts support the inference that Fangcheng wehrlites were metasomatized by carbonatite magmas derived from subducted carbonated pelites before being incorporated into the Early Cretaceous basaltic magmas. This metasomatic process serves as a crucial mechanism for lithospheric modifications and plays a key role in regional carbon cycling in the southeastern NCC, encompassing the subduction of carbonate-bearing continental crusts and subsequent devolatilization through mantle-derived volcanism.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"288 ","pages":"Article 106596"},"PeriodicalIF":2.7,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}