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Mossbauer,optical and structural properties of Fe^(3+) ion in borate glass

Journal of Rare Earths 2025年第1期43卷 162-170,I0006页

作者： Essam A.Elkelany hesham y.Amin A.Samir M.M.EL-hady h.h.El-Bahnasawy Moukhtar A.hassan Basic Science Department Faculty of EngineeringSinai UniversityAl-Arish45511Egypt School of Information and Electrical Engineering Hangzhou City UniversityHangzhou30015China State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou310027China Basic Science Department Faculty of Engineering at ShoubraBenha University11629Egypt Physics Department Faculty of ScienceAl-Azhar University11884CairoEgypt

Lanthanum-bearing iron lithium borate glass is a quaternary system for oxide glasses and was prepared via the melt-quenching *** present article correlates the structure,optical,ligand field and M?ssbauer data on iron lithium borate glass co ntaining La^(3+).The density was measured,while the molar volume was *** physical parameters are *** increasing the La_(2)O_(3) content within the glass network,infrared spectra analysis reveals structural modifications such as the increase in BO_(4) units and the decline in both BO_(3) units and NBO bonds ***,optical absorption spectra were *** absorption spectra disclose a plethora of electronic transitions that are related to Fe^(3+)in tetrahedral and octahedral sites,however,Fe^(2+)phase is not observed in optical spectra,but it has a clear signature in M?ssbauer ***,the glass absorption edges undergo a clear blue shift,reflecting an increased band gap energy(1.96-2.28 eV).The decline in NBO bonds justifies this ***,the values of crystal field splitting are increased,while the values of Racah parameters are *** trend is justified by the decline in NBO bonds and increases electron localization around Fe cations.M?ssbauer spectra confirm the existence of Fe^(3+)in tetrahedral and octahedral sites,while Fe^(2+)exists in only a tetrahedral *** increasing La_(2)O_(3) content,the isomer shift of Fe^(3+)in tetrahedral sites changes to be 0.312-0.329 mm/s,while the isomer shift of octahedral Fe^(3+)is 0.424-0.456 mm/*** findings coincide with optical *** the isomer shift of tetrahedral Fe^(2+)is 0.902-0.911 mm/*** results of structural,optical and ligand field associated with M?ssbauer spectra open more vistas toward the utility of these samples in the optics realm.

关键词： Fe3+ions Rare-earth oxide Mossbauer spectra Ligand field parameters Optical properties

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Deep view of composite SNR CTA1 with LhAASO in γ-rays up to 300 TeV

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Science China(Physics,Mechanics & Astronomy) 2025年

作者： Zhen Cao F.Aharonian Axikegu y.X.Bai y.W.Bao D.Bastieri X.J.Bi y.J.Bi W.Bian A.V.Bukevich Q.Cao W.y.Cao Zhe Cao J.Chang J.F.Chang A.M.Chen E.S.Chen h.X.Chen Liang Chen Lin Chen Long Chen M.J.Chen M.L.Chen Q.h.Chen S.Chen S.h.Chen S.Z.Chen T.L.Chen y.Chen N.Cheng y.D.Cheng M.C.Chu M.y.Cui S.W.Cui X.h.Cui y.D.Cui B.Z.Dai h.L.Dai Z.G.Dai Danzengluobu X.Q.Dong K.K.Duan J.h.Fan y.Z.Fan J.Fang J.h.Fang K.Fang C.F.Feng h.Feng L.Feng S.h.Feng X.T.Feng y.Feng y.L.Feng S.Gabici B.Gao C.D.Gao Q.Gao W.Gao W.K.Gao M.M.Ge T.T.Ge L.S.Geng G.Giacinti G.h.Gong Q.B.Gou M.h.Gu F.L.Guo J.Guo X.L.Guo y.Q.Guo y.y.Guo y.A.han O.A.hannuksela M.hasan h.h.he h.N.he J.y.he y.he y.K.hor B.W.hou C.hou X.hou h.B.hu Q.hu S.C.hu C.huang D.h.huang T.Q.huang W.J.huang X.T.huang X.y.huang y.huang y.y.huang X.L.Ji h.y.Jia K.Jia h.B.Jiang K.Jiang X.W.Jiang Z.J.Jiang M.Jin M.M.Kang I.Karpikov D.Khangulyan D.Kuleshov K.Kurinov B.B.Li C.M.Li Cheng Li Cong Li D.Li F.Li h.B.Li h.C.Li Jian Li Jie Li K.Li S.D.Li W.L.Li W.L.Li X.R.Li Xin Li y.Z.Li Zhe Li Zhuo Li E.W.Liang y.F.Liang S.J.Lin B.Liu C.Liu D.Liu D.B.Liu h.Liu h.D.Liu J.Liu J.L.Liu M.y.Liu R.y.Liu S.M.Liu W.Liu y.Liu y.N.Liu Q.Luo y.Luo h.K.Lv B.Q.Ma L.L.Ma X.h.Ma J.R.Mao Z.Min W.Mitthumsiri h.J.Mu y.C.Nan A.Neronov K.C.y.Ng L.J.Ou P.Pattarakijwanich Z.y.Pei J.C.Qi M.y.Qi B.Q.Qiao J.J.Qin A.Raza D.Ruffolo A.Sáiz M.Saeed D.Semikoz L.Shao O.Shchegolev X.D.Sheng F.W.Shu h.C.Song yu.V.Stenkin V.Stepanov y.Su D.X.Sun Q.N.Sun X.N.Sun Z.B.Sun J.Takata P.h.T.Tam Q.W.Tang R.Tang Z.B.Tang W.W.Tian L.h.Wan C.Wang C.B.Wang G.W.Wang h.G.Wang h.h.Wang J.C.Wang Kai Wang Kai Wang L.P.Wang L.y.Wang P.h.Wang R.Wang W.Wang X.G.Wang X.y.Wang y.Wang y.D.Wang y.J.Wang Z.h.Wang Z.X.Wang Zhen Wang Zheng Wang D.M.Wei J.J.Wei y.J.Wei T.Wen C.y.Wu h.R.Wu Q.W.Wu S.Wu X.F.Wu y.S.Wu S.Q.Xi J.Xia G.M.Xiang D.X.Xiao G.Xiao y.L.Xin y.Xing D.R.Xiong Z.Xiong D.L.Xu R.F.Xu R.X.Xu W.L.Xu L.Xue D.h.yan J.Z.yan T.yan C.W.yang C.y.yang F.yang F.F.yang L.L.yang M.J.yang R.Z.yang W.X.yang y.h.yao Z.G.yao L.Q.yin N.yin X.h.you Z.y.you y.h Southwest Jiaotong University School of Astronomy and Space Science Nanjing University Center for Astrophysics Guangzhou University Tsung-Dao Lee Institute & School of Physics and Astronomy Shanghai Jiao Tong University Institute for Nuclear Research of Russian Academy of Sciences hebei Normal University University of Science and Technology of China LhAASO Collaboration State Key Laboratory of Particle Detection and Electronics Key Laboratory of Dark Matter and Space Astronomy & Key Laboratory of Radio Astronomy Purple Mountain Observatory Chinese Academy of Sciences Research Center for Astronomical Computing Zhejiang Laboratory Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical Observatory Chinese Academy of Sciences School of Physics and Astronomy Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center yunnan University Key Laboratory of Cosmic Rays (Tibet University) Ministry of Education Department of Physics The Chinese University of hong Kong Key Laboratory of Radio Astronomy and Technology National Astronomical Observatories Chinese Academy of Sciences School of Physics and Astronomy (Zhuhai) & School of Physics (Guangzhou) & Sino-French Institute of Nuclear Engineering and Technology (Zhuhai) Sun yat-sen University Institute of high Energy Physics Institute of Frontier and Interdisciplinary Science Shandong University APC Université Paris Cité CNRS/IN2P3 CEA/IRFU Observatoire de Paris Department of Engineering Physics & Department of Astronomy Tsinghua University School of Physics and Microelectronics Chinese Academy of Sciences Zhengzhou University yunnan Observatories Chinese Academy of Sciences China Center of Advanced Science and Technology College of Physics Sichuan University School of Physics Peking University Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and Technology University of Chinese Academy of Sciences Guangxi University Department of Physics Faculty of Science Mahidol University Moscow Institute

The ultra-high-energy（UhE） gamma-ray source 1LhAASO J0007+7303u is positionally associated with the composite SNR CTA1 that is located at high Galactic Latitude b ≈ 10.5°. This provides a rare opportunity to spatially resolve the component of the pulsar wind nebula（PWN） and supernova remnant（SNR） at UhE. This paper conducted a dedicated data analysis of 1LhAASO J0007+7303u using the data collected from December 2019 to July 2023. This source is well detected with significances of 21σ and 17σ at 8-100 TeV and >100 TeV, respectively. The corresponding extensions are determined to be 0.23°±0.03°and 0.17°±0.03°. The emission is proposed to originate from the relativistic electrons accelerated within the PWN of PSR J0007+7303. The energy spectrum is well described by a power-law with an exponential cutoff function dN/dE =（42.4 ± 4.1）(E/（20 TeV）)-2.31±0.11exp(-E/（110±25 TeV）) TeV-1cm-2s-1in the energy range from 8 to 300 TeV, implying a steady-state parent electron spectrum dNe/dEe∝(Ee/（100 TeV）)-3.13±0.16exp[(-Ee/（373±70 TeV）)2] at energies above ≈ 50 TeV. The cutoff energy of the electron spectrum is roughly equal to the expected current maximum energy of particles accelerated at the PWN terminal shock. Combining the X-ray and gamma-ray emission, the current space-averaged magnetic field can be limited to≈ 4.5 μG. To satisfy the multi-wavelength spectrum and the γ-ray extensions, the transport of relativistic particles within the PWN is likely dominated by the advection process under the free-expansion phase assumption.

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LhAASO detection of very-high-energy γ-ray emission surrounding PSR J0248+6021

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Science China(Physics,Mechanics & Astronomy) 2025年

We report the detection of an extended very-high-energy(VhE) γ-ray source coincident with the location of middle-aged(62.4 kyr) pulsar PSR J0248+6021, by using the LhAASO-WCDA data of live 796 d and LhAASO-KM2A data of live 1216d. A significant excess of γ-ray induced showers is observed both by WCDA in energy bands of 1-25 Te V and KM2A in energy bands of >25 TeV with 7.3σ and 13.5σ, respectively. The best-fit position derived through WCDA data is R.A. = 42.06°± 0.12°and Dec. = 60.24°± 0.13°with an extension of 0.69°±0.15°and that of the KM2A data is R.A.= 42.29°± 0.13°and Dec. =60.38°± 0.07°with an extension of 0.37°±0.07°. No clear extended multiwavelength counterpart of this LhAASO source has been found from the radio band to the GeV band. The most plausible explanation of the VhE γ-ray emission is the inverse Compton process of highly relativistic electrons and positrons injected by the pulsar. These electrons/positrons are hypothesized to be either confined within the pulsar wind nebula or to have already escaped into the interstellar medium, forming a pulsar halo.

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Observation of the γ-ray emission from W43 with LhAASO

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Science China(Physics,Mechanics & Astronomy) 2025年

In this paper, we report the detection of the very-high-energy (VhE, 100 Ge V100 TeV) γ-ray emissions from the direction of the young star-forming region W43, observed by the Large high Altitude Air Shower Observation (LhAASO). The extended γ-ray source was detected with a significance of～16σby KM2A and～17σby WCDA, respectively. The angular extension of this γ-ray source is about 0.5 degrees, corresponding to a physical size of about 50pc. We discuss the origin of the γ-ray emission and possible cosmic ray acceleration in the W43 region using multi-wavelength data. Our findings suggest that W43 is likely another young star cluster capable of accelerating cosmic rays (CRs) to at least several hundred TeV.

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Leveraging ROTI map derived from Indonesian GNSS receiver network for advancing study of Equatorial Plasma Bubble in Southeast/East Asia

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Earth and Planetary Physics 2025年第1期9卷 101-116页

作者： Prayitno Abadi Ihsan N.Muafiry Teguh N.Pratama Angga y.Putra Suraina Gatot h.Pramono Sidik T.Wibowo Febrylian F.Chabibi Umar A.Ahmad Wildan P.Tresna Asnawi Research Center for Climate and Atmosphere Indonesian National Research and Innovation Agency(BRIN)BandungIndonesia School of Electrical Engineering Telkom UniversityBandungIndonesia Directorate of Laboratory Management Facilities and Science and Technology Park Indonesian National Research and Innovation Agency(BRIN)PontianakIndonesia Geophysics Laboratory Master Program in PhysicsUniversitas Gadjah Mada(UGM)YogyakartaIndonesia Research Center for Space Indonesian National Research and Innovation Agency(BRIN)BandungIndonesia Indonesian Geospatial Information Agency(BIG) JakartaIndonesia Research Center for Photonics Indonesian National Research and Innovation Agency(BRIN)Tangerang SelatanIndonesia Department of Earth and Planetary Sciences Hokkaido UniversitySapporoJapan

This paper highlights the crucial role of Indonesia’s GNSS receiver network in advancing Equatorial Plasma Bubble(EPB)studies in Southeast and East Asia,as ionospheric irregularities within EPB can disrupt GNSS signals and degrade positioning *** by the Indonesian Geospatial Information Agency(BIG),the Indonesia Continuously Operating Reference Station(Ina-CORS)network comprises over 300 GNSS receivers spanning equatorial to southern low-latitude ***-CORS is uniquely situated to monitor EPB generation,zonal drift,and dissipation across Southeast *** provide a practical tool for EPB research,by sharing two-dimensional rate of Total Electron Content(TEC)change index(ROTI)derived from this *** generate ROTI maps with a 10-minute resolution,and samples from May 2024 are publicly available for further scientific *** preliminary findings from the ROTI maps of Ina-CORS are ***,the Ina-CORS ROTI maps reveal that the irregularities within a broader EPB structure persist longer,increasing the potential for these irregularities to migrate farther ***,we demonstrate that combined ROTI maps from Ina-CORS and GNSS receivers in East Asia and Australia can be used to monitor the development of ionospheric irregularities in Southeast and East *** have demonstrated the combined ROTI maps to capture the development of ionospheric irregularities in the Southeast/East Asian sector during the G5 Geomagnetic Storm on May 11,*** observed simultaneous ionospheric irregularities in Japan and Australia,respectively propagating northwestward and southwestward,before midnight,whereas Southeast Asia’s equatorial and low-latitude regions exhibited irregularities *** sharing ROTI maps from Indonesia and integrating them with regional GNSS networks,researchers can conduct comprehensive EPB studies,enhancing the understanding of EPB behavior across Southeast and East Asia and contributing significantly to ionosphe

关键词： Equatorial Plasma Bubble(EPB) GNSS receivers’network Indonesia Continuously Operating Reference Station(Ina-CORS) ionospheric map Rate of TEC change index(ROTI)map

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Magnitude, spatial patterns and drivers of methane fluxes from coastal salt marshes and mangrove forests in China

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Science China Earth Sciences 2025年第3期68卷 850-866页

作者： yixuan yU Derrick y.F.LAI Minjie hU Chuan TONG Key Laboratory of humid Subtropical Eco-geographical Process of Ministry of Education Fujian Normal University School of Geographical Sciences Fujian Normal University Department of Geography and Resource Management The Chinese University of Hong Kong

Methane（Ch4） is a highly potent greenhouse gas due to its high radiative forcing and global warming *** the magnitude, spatial patterns, and drivers of Ch4emission from wetlands at the regional scale is crucial for formulating suitable strategies to mitigate future climate change. In this study, we synthesized the Ch4flux data reported for major plant communities in the coastal salt marshes and mangrove forests in China and produced a spatial map of Ch4fluxes from the mangrove sediments and salt marshes in China based on the results of machine learning models. Moreover, we examined the main drivers of Ch4flux from these coastal wetlands and estimated the annual Ch4emissions from the salt marshes and mangrove forests in different coastal provinces of China using a bottom-up approach. Our results showed that the mean Ch4fluxes from the salt marsh and mangrove ecosystems in China were 2.22±0.29 and 2.26±0.55 mg m-2h-1, respectively. Across China, the total annual Ch4emission from salt marshes was 31,179.75 Mg Ch4a-1, while that from mangroves was 5,533.97 Mg Ch4a-1with the sediments contributing to 12.7%(701.64 Mg Ch4a-1) of the total efflux. The salt marshes and mangroves in China accounted for 2.75% and 0.14%–0.15% of the global annual Ch4emissions from these two ecosystems,respectively. Moreover, we found that Ch4emissions from the salt marshes and mangroves could offset the cooling impact arising from net carbon dioxide uptake by 88% and 53%, respectively, over a 100-year time scale. Mean annual temperature, soil moisture, and soil organic carbon content were the main factors controlling Ch4emissions from these coastal ***, we found that Ch4fluxes from the salt marshes in China decreased with latitude, which implied a possible increase in marsh Ch4emission in response to global warming that should be considered carefully when developing nature-based climate solutions to achieve national goals for carbon neutrality.

关键词： Salt marsh Mangrove Methane flux Spatial pattern Driving factors China

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含泛醇面膜改善不同类型皮肤屏障损伤的功效性和安全性

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中华皮肤科杂志 2025年第1期58卷 93-94页

作者：陈旭魏宇昊牛悦青 L'Oreal China Shanghai China Second Affiliated hospital of Chongqing Medical University Chongqing China

皮肤屏障受损是一种常见的皮肤问题,累及多种皮肤类型,其中包括干性敏感型、油性敏感型和油性痤疮型皮肤,普遍表现为对外界刺激的反应性增强。皮肤屏障受损后皮肤的防御能力减弱,经表皮失水量(TEWL)增加,脂质组成改变,对炎症和感染的易... 详细信息

皮肤屏障受损是一种常见的皮肤问题,累及多种皮肤类型,其中包括干性敏感型、油性敏感型和油性痤疮型皮肤,普遍表现为对外界刺激的反应性增强。皮肤屏障受损后皮肤的防御能力减弱,经表皮失水量(TEWL)增加,脂质组成改变,对炎症和感染的易感性升高,还会对个体的生活质量产生不同程度的负面影响。

关键词：皮肤屏障皮肤类型敏感型功效性失水量外界刺激易感性安全性

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Diet fortification for mild and moderate picky eating in typically developed children:Opinion review of Middle East consensus

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World Journal of Clinical Pediatrics 2025年第1期14卷 139-148页

作者： Mohammed Al-Beltagi Elie Choueiry Najat Alahmadi Zeinab Demerdash Wafaa helmi Ayesh Khoula Al-Said Fatima Al-haddad Sanaa y Shaaban Eslam Tawfik Department of Pediatric Faculty of MedicineTanta UniversityTanta 31511Egypt Department of Pediatric University Medical CenterKing Abdulla Medical CityArabian Gulf UniversityManama 26671ManamaBahrain Paediatric Intensive and Critical Care Unit Hospital Hôtel Dieu de FranceBeirut 166830BeyrouthLebanon Department of Pediatric Gastroenterology Hepatology and NutritionMadina Maternity and Children HospitalKing Salman Medical CityAlmadina Almonawarh 41412Almadina AlmonawarhSaudi Arabia Department of Gastroenterology Hepatology and NutritionAl Amiri HospitalKuwait City 999044Kuwait Department of Nutrition Altadawi Speciality HospitalDubai 1853DubayyUnited Arab Emirates Department of Paediatric Gastroenterology Royal HospitalMuscat 1331MuscatOman Department of Dietetic Salmaniya Medical ComplexGovernment HospitalsAl Salmaniya 12ManamaBahrain Department of Pediatrics Faculty of MedicineAin Shams UniversityCairo 11591Egypt Department of Paediatric Faculty of MedicineSuez UniversitySuez 41522Egypt Department of Paediatric Sheikh Khalifa Medical CityAbu Dhabi 00000Abu DhabiUnited Arab Emirates

BACKGROUND Picky eating is a commonly observed behavior among children globally,negatively impacting their physical and mental *** common characteristics distinguish peaky eaters,including food selectivity,food neophobia,and food avoidance,there is no clear definition to assess this *** to the unavailability of data regarding picky eating,it wasn’t easy to estimate its *** To develop a regional protocol to help healthcare professionals identify and manage mild and moderate picky eating *** A virtual roundtable discussion was held in April 2021 to gather the opinions of seven pediatricians and two pediatric dietitians from eight Middle Eastern countries who had great experience in the management of picky *** discussion covered different topics,including clearly defining mild and moderate picky eating,identifying the role of diet fortification in these cases,and the possibility of developing a systematic approach to diet *** The panel identified picky eating as consuming an inadequate amount and variety of foods by rejecting familiar and unfamiliar *** of the time,moderate picky eating cases had micronutrient deficiencies with over-or undernutrition;the mild cases only showed inadequate food consumption and/or poor diet *** attention to the organic red flags like growth faltering and development delay and behavioral red flags,including food fixation and anticipatory gagging,will help healthcare professionals evaluate the picky eaters and the caregivers to care for their *** dietary supplementation and commercial food fortification play an important role in picky eating,they were no benefit in the Middle *** The panel agreed that food fortification through a food-first approach and oral nutritional supplements would be the best for Middle Eastern *** recommendations would facilitate identifying and managing picky-eating children in the Middle East.

关键词： Picky eating Diet fortification Children Protocol Roundtable discussion Middle East

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Evaluating the hydrocarbon generation potential of the Paleocene–Eocene carbonaceous rocks in the Barmer and Bikaner-Nagaur Basins, western Rajasthan, India

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China Geology 2025年第1期8卷 77-91页

作者： Alok Kumar Khairul Azlan Mustapha Alok K.Singh Mohammed hail hakimi Ali y.Kahal Waqas Naseem hijaz Kamal hasnan Department of Geology Faculty of ScienceUniversiti MalayaKuala Lumpur 50603Malaysia Department of Geology Institute of ScienceBanaras Hindu UniversityVaranasi 221005India Department of Petroleum Engineering and GeoEngineering Rajiv Gandhi Institute of Petroleum TechnologyJais 229304India Institute of Geology and Petroleum Technologies Kazan Federal UniversityKazan 420008Russia Geology and Geophysics Department King Saud UniversityRiyadh 11451Saudi Arabia Department of Geology University of PoonchRawalakot 12350Pakistan

The Bikaner-Nagaur and Barmer Basins(Rajasthan)are the most important petroliferous sedimentary basins in *** over a decade,the exploration and extraction of hydrocarbons in these ***-Eocene age rocks bear organic-rich sediments in these basins,including lignite and carbonaceous shale *** present research investigates the source rock properties,petroleum potential and thermal maturity of the carbonaceous shale partings from the lignite mines of Gurha(Bikaner-Nagaur Basin)and Kapurdi(Barmer Basin)using petrographical and geochemical *** carbonaceous shales have high organic matter(OM),with considerable total organic carbon(TOC)contents ranging from 13%to 39%.Furthermore,they contain hydrogen-rich kerogen,including types II and II/III,as evidenced by the Rock-Eval and elemental analysis *** existence of these kerogen types indicates the abundance of reactive(vitrinite and liptinite)***,the carbonaceous shales from the Bikaner–Nagaur Basin have oil generation potentials,with a high hydrogen index(up to 516 mg hC/g TOC)and a h/C ratio(up to 1.5)along with a significant presence of oil-prone liptinitic *** from the geochemical and petrological results,the studied shales have low huminite reflectance(0.31%–0.48%),maximum temperature(S_(2) peak;Tmax)between 419℃ and 429℃,and low production index values(PI:0.01–0.03).These results indicate that these carbonaceous shales contain immature OM,and thereby,they cannot yet release commercial amount of *** immaturity level in the studied outcrop section is due to the shallow burial *** proxies further indicate the presence of both oil and gas-prone source rocks.

关键词： Carbonaceous shale Petroliferous Bikaner-Nagaur Basin Barmer Basin high hydrogen index hydrogen-rich kerogen Western Rajasthan Geochemistry Petrology

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超临界地质流体的形成与演化

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中国科学:地球科学 2025年第1期55卷 38-51页

作者：倪怀玮肖益林熊小林刘显东高春晓陈伊翔李云国李万财郭璇王洋洋谭东波张力中国科学技术大学岩石圈演化与环境演变全国重点实验室合肥230026 中国科学技术大学深空探测实验室/地球和空间科学学院合肥230026 中国科学院广州地球化学研究所广州510640 南京大学地球科学与工程学院南京210023 吉林大学超硬材料国家重点实验室长春130012

本文全面阐述了超临界地质流体的形成、演化、性质和效应.在地球内部,特殊组分的加入或温度压力的升高使h2O和硅酸盐的混溶性增强,形成同时含有大量h2O和硅酸盐溶质的超临界地质流体.在以伟晶岩体系为代表的岩浆-热液体系中,超临界地质... 详细信息

本文全面阐述了超临界地质流体的形成、演化、性质和效应.在地球内部,特殊组分的加入或温度压力的升高使h2O和硅酸盐的混溶性增强,形成同时含有大量h2O和硅酸盐溶质的超临界地质流体.在以伟晶岩体系为代表的岩浆-热液体系中,超临界地质流体的形成受控于熔体-流体临界曲线.在以俯冲板片为代表的变质岩体系中,超临界地质流体的形成受控于第二临界端点.实验结果表明,伟晶岩体系中硼和氟的存在使得地壳深度可能形成超临界地质流体,而俯冲板片则要迟至近100km深度才会释放超临界地质流体.富含h2O和解聚结构单元(单体、二聚体等)赋予了超临界地质流体独特的物理性质,包括低密度、低弹性模量、低黏度、高扩散系数和高电导率.超临界地质流体可以有效迁移包括高场强元素和重稀土元素在内的多种元素.超临界地质流体的化学特征能被交代地幔和幔源熔体继承,这可以解释弧岩浆氧化性.超临界地质流体可通过旋节分解发生相分离形成熔体网络.俯冲带岩石和伟晶岩中发现的多相流体包裹体可能是超临界地质流体的残留物.超临界地质流体可以造成俯冲板片顶部附近的低速高导异常,并且可能与中源地震存在联系.超临界地质流体可能在伟晶岩及其矿床的形成过程中起到了关键作用.

关键词：超临界地质流体混溶俯冲带伟晶岩

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