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Experimental study on reactions between alkaline basaltic melt and orthopyroxenes: constraints on the evolution of lithospheric mantle in the North China Craton

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Acta Geochimica 2024年第2期43卷 354-365页

作者： Hanqi He Mingliang Wang Hongfeng Tang Key Laboratory for High Temperature and High Pressure study of the earth’s interior Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China University of Chinese Academy of sciences Beijing 100049China school of Resource and Civil Engineering Suzhou UniversitySuzhou 234000AnhuiChina

The experimental results of the reactions between an alkaline basaltic melt and mantle orthopyroxenes under high-temperature and high-pressure conditions of 1300–1400℃ and 2.0–3.0 GPa using a six-anvil apparatus are reported in this *** reactions are proposed to simulate the interactions between melts from the asthenospheric mantle and the lithospheric *** starting melt in the experiments was made from the alkaline basalt occurring in Fuxin,Liaoning Province,and the orthopyroxenes were separated from the mantle xenoliths in Damaping,Hebei *** results show that clinopyroxenes were formed in all the reactions between the alkaline basaltic melt and orthopyroxenes under the studied P–T *** formation of clinopyroxene in the reaction zone is mainly controlled by dissolution–crystallization,and the chemical compositions of the reacted melt are primarily infl uenced by the diff usion eff *** is the most important parameter controlling the reactions between the melt and orthopyroxenes,which has a direct impact on the melting of orthopyroxenes and the diff usion of chemical components in the *** also directly controls the chemical compositions of the newly formed clinopyroxenes in the reaction zone and the reacted *** formation of clinopyroxenes from the reactions between the alkaline basaltic melt and orthopyroxenes can result in an increase of CaO and Al_(2)O_(3) contents in the rocks containing this ***,the reactions between the alkaline basaltic melt from the asthenospheric mantle and orthopyroxenes from the lithospheric mantle can lead to the evolution of lithospheric mantle in the North China Craton from refractory to fertile with relatively high CaO and Al 2 O 3 *** addition,the reacted melts in some runs were transformed from the starting alkaline basaltic into tholeiitic after reactions,indicating that tholeiitic magma could be generated from alkaline basaltic one via reactions betwe

关键词： Alkaline basaltic melt Orthopyroxene Melt–mineral reaction High-temperature and high-pressure experiment Genesis of basalt Evolution of lithospheric mantle in the North China Craton

High-Pressure Behavior of Ferromagnesite(Mg_(0.81)Fe_(0.19))CO_(3)by synchrotron X-Ray Diffraction and Raman spectroscopy up to 53 GPa

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Journal of earth science 2024年第2期35卷 525-535页

作者： Lin Liang Guibin Zhang shengxuan Huang Jingjing Niu Dongzhou Zhang Jingui Xu Wen Liang shan Qin Key Laboratory of Orogenic Belts and Crustal Evolution MOEand School of Earth and Space SciencesPeking UniversityBeijing100871China CAs Center of Excellence in Tibetan Plateau earth sciences and Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing100101China Hawai’i institute of Geophysics and Planetology School of Ocean and Earth Science and TechnologyUniversity of Hawai’i at ManoaHawai’i96822USA Key Laboratory of High Temperature and High Pressure study of the earth’s interior Institute of GeochemistryChinese Academy of SciencesGuiyang550081China

Ferromagnesite(Mg,Fe)CO_(3)with 20 mol%iron is a potential host mineral for carbon transport and storage in the earth *** high-pressure behavior of synthetic ferromagnesite(Mg_(0.81)Fe_(0.19))CO_(3)up to 53 GPa was investigated by synchrotron X-ray diffraction(XRD)and Raman *** iron bearing carbonate underwent spin transition at around 44–46 GPa accompanied by a volume collapse of 1.8%,which also demonstrated a variation in the dνi/dP slope of the Raman *** pressure-volume data was fitted by a third-order Birch-Murnaghan equation of state(BM-Eos)for the high spin *** best-fit K_(0)=108(1)GPa and K_(0)'=4.2(1).Combining the dνi/dP and the K_(0),the mode Grüneisen parameters of each vibrational mode(T,L,ν4 andν1)were *** effects of iron concentration on the Mg_(1−x)Fe_(x)CO_(3)system related to high-pressure compressibility and vibrational properties are *** results expand the knowledge of the physical properties of carbonates and provide insights to the potential deep carbon host.

关键词： ferromagnesite synchrotron XRD Raman spectroscopy high pressure geochemistry mineral

Chronological study of Coal-seam Water and its Implication on Gas Production in the south Qinshui Basin

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Acta Geologica sinica(English Edition) 2024年第1期98卷 207-219页

作者： CHEN Biying FANG Lujia LANG Yunchao XU sheng LIU Congqiang ZHANG Luyuan HOU Xiaolin institute of surface-earth system science School of Earth System ScienceTianjin UniversityTianjin 300072China institute of earth Environments Chinese Academy of SciencesXi’an 710061China

The knowledge of the residence time of formation water is fundamental to understanding the subsurface flow and hydrological *** better identify the origin and evolution of coal seam water and its impact on gas storage and production,this study collected coalbed methane co-produced water in the southeast Qinshui Basin and detected chemical and isotopic compositions,especially 36Cl and 129I *** calculated tracer ages of 129I(5.2–50.6 Ma)and 36Cl(0.13–0.76 Ma)are significantly younger than the age of coal-bearing formation(Pennsylvanian-Cisuralian),indicating freshwater recharge after coal *** model that utilises 129I/I and 36Cl/Cl ratios to constrain the timing of recharge and the proportion of recharge water reveals that over 60%of pre-anthropogenic meteoric water entered coal seams since 10 Ma and mixed with residue initial deposition water,corresponding to the basin inversion in *** spatial distribution of major ion concentrations reveals the primary recharge pathway for meteoric water from coal outcrops at the eastern margin to the basin *** study demonstrates the occurrence of higher gas production rates from wells that accept water recharge in recent times and suggests the possible potential of the non-stagnant zones for high gas production.

关键词： CBM co-produced water iodine-129 chlorine-36 water chemistry Qinshui Basin

Electrical conductivity of multiphase garnet under high- temperature and high- pressure conditions

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Journal of earth science 2024年

作者： Kui Han Xinzhuan Guo Hanyong Liu Fengbao Ji Kay Laboratory of earth Exploration and Information Techniques (Chengdu University of Technology) Ministry of Education Bayerisches Geoinstitut University of Bayreuth CAs Key Laboratory of High-Temperature and High-Pressure study of the earth' interior institute of Geochemistry Chinese Academy of sciences state Key Laboratory for Mineral Deposits Research school of earth sciences and Engineering Nanjing University Tibet Museum of Natural science

Mineral mixing， a fundamental process during mantle convection， alters the chemical composition of mantle minerals. However， the impact of this process on the electrical conductivity of mineral assemblages remains poorly understood. We measured the electrical conductivity of three single-phase garnets and their corresponding mixtures at 1.5 GPa and varying temperatures using the impedance spectroscopy within frequency from10-1to 106Hz. The electrical conductivity of dehydrated garnets is primarily controlled by their iron content， exhibiting an activation energy about 1.0 eV， indicative of small polaron conduction. The garnet mixture displayed lower electrical conductivities and higher activation energies compared to their single-phase counterparts. This discrepancy of conductivity can be half order of magnitude at high temperatures （>1073 K）， suggesting formation of resistive grain boundaries during the mixing process. In the mantle transition zones， grain boundary conductivity could exert a limited impact on the bulk conductivity of the interface between the stagnant slab and ambient mantle.

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Implementation of a particle-in-cell method for the energy solver in 3D spherical geodynamic modeling

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earth and Planetary Physics 2024年第3期8卷 549-563页

作者： Hao Dong ZeBin Cao LiJun Liu YanChong Li sanZhong Li LiMing Dai XinYu Li Frontiers science Center for Deep Ocean Multispheres and earth system Key Laboratory of Submarine Geosciences and Prospecting TechniquesMinistry of Education and College of Marine GeosciencesOcean University of ChinaQingdao 266100China state Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Laboratory for Marine Geology Laoshan LaboratoryQingdao 266237China Department of earth science&Environmental Change University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Laboratory of seismology and Physics of earth’s interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China

The thermal evolution of the earth’s interior and its dynamic effects are the focus of earth ***,the commonly adopted grid-based temperature solver is usually prone to numerical oscillations,especially in the presence of sharp thermal gradients,such as when modeling subducting slabs and rising *** phenomenon prohibits the correct representation of thermal evolution and may cause incorrect implications of geodynamic *** examining several approaches for removing these numerical oscillations,we show that the Lagrangian method provides an ideal way to solve this *** this study,we propose a particle-in-cell method as a strategy for improving the solution to the energy equation and demonstrate its effectiveness in both one-dimensional and three-dimensional thermal problems,as well as in a global spherical simulation with data *** have implemented this method in the open-source finite-element code Citcoms,which features a spherical coordinate system,distributed memory parallel computing,and data assimilation algorithms.

关键词： numerical oscillation overshooting and undershooting particle-in-cell method three-dimensional spherical geodynamic modeling energy solver finite element method

Nitrogen isotope stratigraphy of the Early Cambrian successions in the Tarim Basin:spatial variability of nitrogen cycling and its implication for paleo-oceanic redox conditions

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Acta Geochimica 2024年第4期43卷 785-801页

作者： Bi Zhu Xuefeng Li Lu Ge Yongquan Chen institute of earth’s Critical Zone School of Earth Sciences and EngineeringHohai UniversityNanjing 210098China Research institute of Exploration and Development Tarim Oil Field CompanyPetroChinaKorlaChina

The Early Cambrian represents a critical time period characterized by extraordinary biological innovations and dynamic redox conditions in *** isotopic signatures of ancient sediments have the potential to elucidate the evolutionary path of marine redox states and the biogeochemical nitrogen cycle within the water column of the Early Cambrian *** existing research on this topic has predominantly focused on south China,the exploration of other continental margins has been limited,leaving contradictory hypotheses *** this study,pairedδ^(15)N andδ^(13)C org analyses were performed on the Lower Cambrian successions from the shiairike section(inner ramp)and Well Tadong 2(deep shelf/basin)in the northwestern and eastern Tarim Basin,*** data from the shiairike section reveal a discernible shift in the operation of different nitrogen cycles for the black chert-shale unit,also referred to as the black rock series in Chinese literature,of the Yurtus Formation(Fortunian stage to lower stage 3).Oscillatingδ^(15)N values for its lower part are suggestive of alternating anaerobic assimilation of NH 4+and denitrification/*** is likely attributed to a shallow,unstable chemocline consistent with the upwelling and incursion of deep,anoxic waters during a major *** contrast,aerobic nitrogen cycling,indicated by positiveδ^(15)N values of>2‰,dominated the upper part alongside a reduction in upwelling *** the other hand,theδ^(15)N signatures of Xishanbulake and Xidashan Formations of Well Tadong 2,which encompass a time interval from the Cambrian Fortunian Age to Age 4,are indicative of N_(2)fixation by diazotrophs as the major nitrogen *** two studied intervals,although not time-equivalent,exhibit separated states of nitrogen cycling at least during the deposition of the Yurtus black rock *** spatially different nitrogen cycling of the studied sections is compatible with a redox-stratified ocean dur

关键词： Nitrogen isotopes Early Cambrian Tarim Black rock series

Fe-Mn interdiffusion in aluminosilicate garnets

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Geoscience Frontiers 2024年第1期15卷 118-125页

作者： Yanjun Yin Baohua Zhang Xinzhuan Guo Key Laboratory of High-temperature and High-pressure study of the earth’s interior Institute of GeochemistryChinese Academy of SciencesGuiyang 550081GuizhouChina University of Chinese Academy of sciences Beijing 100049China Key Laboratory of Big Data in Geosciences and Deep earth Resources of Zhejiang Province School of Earth SciencesZhejiang UniversityHangzhou 310058China

Precise determination of cation diffusivity in garnet can provide critical information for quantitatively understanding the timescales and thermodynamics of various geological processes,but very few studies have been performed for Fe-Mn *** this study,Fe-Mn interdiffusion rates in natural single crystals of Mn-bearing garnet with 750 ppm H2O are determined at 6 GPa and 1273-1573 K in a Kawai-type multi-anvil *** profiles were acquired by electron microprobe and fitted using Boltzmann-Matano *** experimental results show that the Fe-Mn interdiffusion coefficient(DFe-Mn)slightly decreases with increasing *** experimentally determined DFe-Mn in Mn-bearing garnet can be fitted by the Arrhenius equation:DFe-Mn(m2/s)=D0XFenexp(-E*/RT),where E*=(1-XFe)E*Mn+XFeE*Fe,D0=8.06-6.04+9.87×10-9 m2/s,E*Mn=248±27 KJ/mol,E*Fe=226±59 KJ/mol,n=-1.36±*** comparing the present results with previous experimental data suggest that water can greatly enhance the DFe-Mn in *** results indicate that the time required for homogenization of the compositional zoning of a garnet is much shorter than previously thought.

关键词： Fe-Mn interdiffusion Diffusion coefficient Garnet High pressure experiment Water

High sensitivity of semimetal photodetection via Bose–Einstein condensation

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InfoMat 2024年第2期6卷 142-151页

作者： Tuntan Wu Qinxi Qiu Yongzhen Li Qiangguo Zhou Wanli Ma Jingbo Li Lin Jiang Wei Zhou Zhiming Huang state Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghaithe People's Republic of China Hangzhou institute for Advanced study University of Chinese Academy of SciencesHangzhouthe People's Republic of China University of Chinese Academy of sciences Beijingthe People's Republic of China institute of Optoelectronics Fudan UniversityShanghaithe People's Republic of China Key Laboratory of space Active Optical-Electro Technology Chinese Academy of SciencesShanghaithe People's Republic of China

The discovery of semiconductor has witnessed remarkable strides toward high performance of photodetectors attributed to its excellent carrier ***,semimetal,owning to the high carrier concentration and low carrier mobility compared to those of semiconductor,is generally considered unsuitable for ***,we demonstrate an outstanding photodetection in a layered semimetal titanium diselenide(Tise_(2))in Bose-Einstein condensation(BEC)*** sensitivity of semimetal photodetector is realized in the range of visible,infrared and terahertz *** noise equivalent power(NEP)has threefold improvement at the visible and infrared wavebands,and significant decrease by one order of magnitude in the terahertz frequencies via BEC phenomenon,attributed to the electrical parameter variation after *** best NEP value in the terahertz frequency is comparable to that of commercial si *** results show another recipe to fabricate high performance of photodetection via semimetal except for semiconductor and pave the way to exploit macroscopic quantum phenomena for optoelectronics.

关键词： Bose-Einstein condensation electromagnetic induced well effect photodetector semimetal

Research of surface-enhanced Raman scattering on Ag@PMBA@C@Au hybrid nanoparticles

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Optoelectronics Letters 2024年第2期20卷 65-69页

作者： TAN Enzhong LÜ suye Liberal study College Beijing Institute of Petrochemical TechnologyBeijing 102617China

Monodispersed, biocompatible, and readily-functionalized hybrid reporter-embedded core-shell nanopartilces(NPs) have been prepared in a simple route. This composite offers a potential platform for immunochemical detection using surface-enhanced Raman scattering(sERs) due to their high sensitivity, good stability and biocompatiblity. This also provides a new platform for insight into sERs enhancement mechanism.

关键词： mechanism. readily sERs