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The influence of silica on reaction rates and molecular hydrogen(H_(2))generation during olivine hydrothermal alteration

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Science China Earth Sciences 2024年第1期67卷 222-233页

作者： Ruifang HUANG Weidong SUN xing ding Yusheng ZHAO Yibing LI Xiuqi SHANG CAS Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China SUSTech Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China Center of Deep Sea Research Institute of OceanologyChinese Academy of SciencesQingdao 266071China State Key Laboratory of Isotope Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China Institue of Geology Chinese Academy of Geological SciencesBeijing 100037China

Hydrothermal alteration of olivine greatly influences geodynamics and the recycling of volatiles(such as water and carbon)in subduction zones.Silica is an important component of geological fluids,and its influence on the hydrothermal alteration of olivine remains poorly constrained.In this study,we performed experiments at 300–515℃ and 3.0 kbar(1 bar=10^(5)Pa)by reacting well homogenized mixtures of olivine and silica powders with saline solutions(0.5 mol L^(−1)NaCl).Silica greatly influences the reaction pathways,reaction rates,and molecular hydrogen(H_(2))formation during olivine hydrothermal alteration.In experiments at 300℃ and 3.0 kbar with mixtures of olivine and 10 wt%silica,olivine was replaced by serpentine and talc.The proportions of serpentine and talc were determined according to standard curves based on infrared spectroscopy analyses.Around 6.5%serpentine and 12%talc were produced after an experimental duration of 7 days,which had no change after a longer period(14 days).Compared to the kinetics in silica-free systems,the rates of olivine hydrothermal alteration in experiments with 10 wt%silica are much lower.The overall reaction is:4.5Forsterite+5.5SiO_(2),aq+4H_(2)O=Serpentine+2Talc.With the addition of more silica(20 wt%and 40 wt%),olivine was transformed into talc.The rates of reaction were much faster,e.g.,for experiments with olivine and 20 wt%silica,43%of talc was produced after 14 days,which increased to 77%for experiments with 40 wt%silica over the same period.The overall reaction is:3Forsterite+5SiO_(2),aq+2H_(2)O=2Talc.In experiments at 400–505℃ and 3.0 kbar,the promoting effect of silica on olivine hydrothermal alteration was also observed,which is closely associated with a decrease in Gibbs free energies of olivine hydrothermal alteration.At 300℃ and 3.0 kbar,silica decreased H_(2)formed during olivine hydrothermal alteration by around an order of magnitude,resulting in an increase in oxygen fugacity.Based on measured H_(2),we calibrated oxygen fugacities,ranging from 0.96 to 3.41 log un

关键词： Olivine hydrothermal alteration Silica Serpentinization Hydrogen Serpentine

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Effect of F-Rich Fluids on the A-Type Magmatism and Related Metal Mobilization:New Insights from the Fogang-Nankunshan-Yajishan Igneous Rocks in Southeast China

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Journal of Earth Science 2022年第3期33卷 591-608页

作者： xing ding Koulin Su Haibo Yan Jinlong Liang Weidong Sun State Key Laboratory of Isotope Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China CAS Center for Excellence in Deep Earth Sciences Guangzhou 510640China Geological Survey Institute of Guangzhou Guangzhou 510640China Center of Deep Sea Research Institute of OceanographyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Department of Geochemistry Chengdu University of TechnologyChengdu 610059China

About 45%of tungsten,~20%of tin,and~9%of fluorite of known world reserves are associated with Late Mesozoic igneous rocks,Southeast(SE)China.Here we demonstrate that Fogang granite,the largest inland batholith,is mainly of A2-type that is commonly found in post-orogenic settings and experienced plate subduction induced metasomatism.In contrast,the Yajishan syenite and Nankunshan granite intruding the Fogang granite~20 Ma later are of A1-type formed in intraplate settings.We found that F-rich fluid fractionation,which could make the decline of Ga/Al ratio,total(Nb+Y+Ce+Zr)and Zr concentrations,Nb/Ta and Zr/Hf ratios,leads to chemical variations of a few Fogang granites changing from A2-type to highly fractionated or I-and S-type granitoids.Crystal and Frich fluid fractionations,as well as crustal contamination most likely derived from the Fogang granite,result in some Nankunshan granites developing from A1-type into A2-type.These late-or post-magmatic processes should be taken into account carefully when discriminating the petrogenetic types of igneous rocks,especially for the A2-type suites.Combining with the distribution of 180-140 Ma A1-and A2-type igneous rocks,rare metal deposits,and fluorite deposits in SE China,we highlight the significant role of slab-released F-rich fluids in formation of A-type suites and subsequent chemical differentiation and rare metal and fluorine mineralization.A model of flat-slab northeastward rollback is thus proposed,in which the subduction front reached somewhere near Fogang and then started to roll back at~165 Ma.The inland Jurassic granites of SE China represent a unique locality for formation of A-type suites and their associated mineralization.These granites are not anorogenic,but they are the result of slab rollback from a flat slab,founding of that slab at shallow levels,and metasomatism of by F-rich fluids related to slab heating by the asthenosphere.

关键词： A-type granite alkaline F-rich fluids slab rollback rare metal rare earth elements Nb/Ta

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High-throughput screening of novel TFEB agonists in protecting against acetaminopheninduced liver injury in mice

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Acta Pharmaceutica Sinica B 2024年第1期14卷 190-206页

作者： Xiaojuan Chao Mengwei Niu Shaogui Wang Xiaowen Ma Xiao Yang Hua Sun Xujia Hu Hua Wang Li Zhang Ruili Huang Menghang Xia Andrea Ballabio Hartmut Jaeschke Hong-Min Ni Wen-xing ding Department of Pharmacology Toxicology and TherapeuticsUniversity of Kansas Medical CenterKansas CityKS 66160USA NMPA Key Laboratory for Research and Evaluation of Drug Metabolism&Guangdong Provincial Key Laboratory of New Drug Screening School of Pharmaceutical SciencesSouthern Medical UniversityGuangzhou 510515China Department of Oncology the First Affiliated Hospital of Anhui Medical UniversityAnhui Medical UniversityHefei 230032China National Center for Advancing Translational Sciences National Institutes of HealthBethesdaMD 20892USA Telethon Institute of Genetics and Medicine TIGEMPozzuoliNaples 80131Italy Medical Genetics Department of Translational MedicineFederico II UniversityNaples 80131Italy Department of Molecular and Human Genetics Baylor College of MedicineHoustonTX 77030USA Department of Internal Medicine Division of GastroenterologyHepatology&MotilityUniversity of Kansas Medical CenterKansas CityKS 66160USA

Macroautophagy(referred to as autophagy hereafter)is a major intracellular lysosomal degradation pathway that is responsible for the degradation of misfolded/damaged proteins and organelles.Previous studies showed that autophagy protects against acetaminophen(APAP)-induced injury(AILI)via selective removal of damaged mitochondria and APAP protein adducts.The lysosome is a critical organelle sitting at the end stage of autophagy for autophagic degradation via fusion with autophagosomes.In the present study,we showed that transcription factor EB(TFEB),a master transcription factor for lysosomal biogenesis,was impaired by APAP resulting in decreased lysosomal biogenesis in mouse livers.Genetic loss-of and gain-of function of hepatic TFEB exacerbated or protected against AILI,respectively.Mechanistically,overexpression of TFEB increased clearance of APAP protein adducts and mitochondria biogenesis as well as SQSTM1/p62-dependent non-canonical nuclear factor erythroid 2-related factor 2(NRF2)activation to protect against AILI.We also performed an unbiased cell-based imaging high-throughput chemical screening on TFEB and identified a group of TFEB agonists.Among these agonists,salinomycin,an anticoccidial and antibacterial agent,activated TFEB and protected against AILI in mice.In conclusion,genetic and pharmacological activating TFEB may be a promising approach for protecting against AILI.

关键词： Autophagy DILI Drug screening Hepatotoxicity Lysosome Mitochondria Mitophagy NRF2

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New hydrous phases in the Al_(2)O_(3)-SiO_(2)-H_(2)O system under the mantle transition zone conditions

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Science China Earth Sciences 2023年第4期66卷 730-737页

作者： Baoyun WANG Jin LIU Suyu FU Pu XIAO Li LI xing ding Wansheng XIAO College of Material and Chemical Engineering Tongren UniversityTongren 554300China Center for High Pressure Science and Technology Advanced Research(HPSTAR) Beijing 100193China Department of Earth and Planetary Science the University of TokyoTokyo 1130033Japan State Key Laboratory of Isotope Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China Key Laboratory of Mineralogy and Metallogeny Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China

Hydrous minerals in the subducting slabs are potential water carriers into the deep mantle,and thus the synthesis of new hydrous phases is significant in our understanding of water circulation throughout the Earth’s interior.In this study,we report the two new hydrous phases,Al_(2)SiO_(6)H_(2)and Al_(5.5)Si_(4)O_(18)H_(3.5)(hereafter referred to simply as phases Psi and Phi,respectively),which are synthesized in the Al_(2)O_(3)-SiO_(2)-H_(2)O system at 15.5 GPa,1400℃and 17.5 GPa,1600℃ by using Sakura2500-ton multi-anvil apparatus.The luminescence spectra of Cr3+show the phase Psi has characteristic peaks at 687,693 and705 nm,while phase Phi has characteristic peaks at 691,696 and 708 nm.Single-crystal X-ray diffraction (SCXRD) refinements yield a monoclinic structure of both phases (space group P2_(1)) with ideal chemical formulae of Al_(2)SiO6H2and Al5.5Si4O18H3.5respectively.The determined lattice parameters for phase Psi are a=9.4168±0.0016Å,b=4.3441±0.0007Å,c=9.4360±0.002Åand β=119.726±0.005°at ambient pressure and 300 K,while the phase Phi has a=7.2549±0.0018Å,b=4.3144±0.001Å,c=8.0520±0.002Å,and β=101.740±0.009°at ambient pressure and 250 K.Electron microprobe analyses (EPMA) show the chemical compositions of phases Psi and Phi to be Al_(1.99)Si_(0.85)O_(6)H_(2.62)and Al_(5.58)Si_(2.81)O_(18)H_(8.03),respectively,which slightly deviate from the ideal formulae inferred from SCXRD measurements.This may result from the disorder or substitution of Al and Si by H in the crystal structures under our synthesis conditions.Our study suggests that phases Psi and Phi are the two potential water carriers at the upper part of the mantle transitions zone,providing new insights into how deep water is stored in this region.

关键词： New hydrous phases Mantle transition zone Al_(2)O_(3)-SiO_(2)-H_(2)O system Al_(2)SiO_(6)H_(2) Al_(5.5)Si_(4)O_(18)H_(3.5)

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Intelligent risk identification of gas drilling based on nonlinear classification network

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Petroleum Science 2023年第5期20卷 3074-3084页

作者： Wen-He Xia Zong-Xu Zhao Cheng-Xiao Li Gao Li Yong-Jie Li xing ding Xiang-Dong Chen School of Electrical Engineering and Information Southwest Petroleum UniversityChengdu 610500SichuanChina CCDC Drilling&Production Engineering Technology Research Institute Deyang 618500SichuanChina School of Oil&Natural Gas Engineering Southwest Petroleum UniversityChengdu 610500SichuanChina School of Information Science and Technology Southwest Jiaotong UniversityChengdu 610031SichuanChina

During the transient process of gas drilling conditions,the monitoring data often has obvious nonlinear fluctuation features,which leads to large classification errors and time delays in the commonly used intelligent classification models.Combined with the structural features of data samples obtained from monitoring while drilling,this paper uses convolution algorithm to extract the correlation features of multiple monitoring while drilling parameters changing with time,and applies RBF network with nonlinear classification ability to classify the features.In the training process,the loss function component based on distance mean square error is used to effectively adjust the best clustering center in RBF.Many field applications show that,the recognition accuracy of the above nonlinear classification network model for gas production,water production and drill sticking is 97.32%,95.25%and 93.78%.Compared with the traditional convolutional neural network(CNN)model,the network structure not only improves the classification accuracy of conditions in the transition stage of conditions,but also greatly advances the time points of risk identification,especially for the three common risk identification points of gas production,water production and drill sticking,which are advanced by 56,16 and 8 s.It has won valuable time for the site to take correct risk disposal measures in time,and fully demonstrated the applicability of nonlinear classification neural network in oil and gas field exploration and development.

关键词： Gas drilling Intelligent identification of drilling risk Nonlinear classification RBF Neural Network K-means algorithm

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中国数字经济与企业集聚空间格局重塑

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科学学研究 2024年第3期42卷 528-540页

作者：邢丁徐康宁东南大学经济管理学院江苏南京211189

数字经济已成为重塑社会经济空间组织的重要力量。基于2011-2020年中国285个城市面板数据,使用GIS空间分析、空间杜宾模型和地理加权回归模型,分析数字经济空间格局演变及其对企业空间集聚的重塑效应。结果表明:(1)2011-2020年中国数字... 详细信息

数字经济已成为重塑社会经济空间组织的重要力量。基于2011-2020年中国285个城市面板数据,使用GIS空间分析、空间杜宾模型和地理加权回归模型,分析数字经济空间格局演变及其对企业空间集聚的重塑效应。结果表明:(1)2011-2020年中国数字经济发展水平的空间分布呈现出东高西低的分布特征,高值区主要集聚在东部沿海地区以及部分省会城市。(2)2011-2020年规模以上工业企业的空间集聚格局始终呈现出“东高西低”型的分布特征,并逐渐向中西部地区扩散。(3)总体来说,数字经济对企业集聚起分散作用,且相比于小城市,数字经济对大城市企业空间集聚的分散力更强。(4)数字经济对企业空间集聚的影响存在空间异质性,数字经济对东部地区和沿海地区的企业集聚有更大的分散力。

关键词：数字经济企业集聚空间分布空间异质性

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The influence of silica on reaction rates and molecular hydrogen(H) generation during olivine hydrothermal alteration

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Science China Earth Sciences 2023年

作者： Ruifang HUANG Weidong SUN xing ding Yusheng ZHAO Yibing LI Xiuqi SHANG SUSTech Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology Institue of Geology Chinese Academy of Geological Sciences State Key Laboratory of Isotope Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Center of Deep Sea Research Institute of Oceanology Chinese Academy of Sciences CAS Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences

Hydrothermal alteration of olivine greatly influences geodynamics and the recycling of volatiles(such as water and carbon) in subduction zones. Silica is an important component of geological fluids, and its influence on the hydrothermal alteration of olivine remains poorly constrained. In this study, we performed experiments at 300–515°C and 3.0 kbar(1 bar=105Pa) by reacting well homogenized mixtures of olivine and silica powders with saline solutions(0.5 mol L-1NaCl). Silica greatly influences the reaction pathways, reaction rates, and molecular hydrogen(H2) formation during olivine hydrothermal alteration.In experiments at 300°C and 3.0 kbar with mixtures of olivine and 10 wt% silica, olivine was replaced by serpentine and talc. The proportions of serpentine and talc were determined according to standard curves based on infrared spectroscopy analyses.Around 6.5% serpentine and 12% talc were produced after an experimental duration of 7 days, which had no change after a longer period(14 days). Compared to the kinetics in silica-free systems, the rates of olivine hydrothermal alteration in experiments with 10 wt% silica are much lower. The overall reaction is: 4.5Forsterite+5.5SiO2,aq+4H2O=Serpentine+2Talc. With the addition of more silica(20 wt% and 40 wt%), olivine was transformed into talc. The rates of reaction were much faster, e.g.,for experiments with olivine and 20 wt% silica, 43% of talc was produced after 14 days, which increased to 77% for experiments with 40 wt% silica over the same period. The overall reaction is: 3Forsterite+5SiO2,aq+2H2O=2Talc. In experiments at400–505°C and 3.0 kbar, the promoting effect of silica on olivine hydrothermal alteration was also observed, which is closely associated with a decrease in Gibbs free energies of olivine hydrothermal alteration. At 300°C and 3.0 kbar, silica decreased H2formed during olivine hydrothermal alteration by around an order of magnitude, resulting in an increase in oxygen fugacity.Based on measured H2, we calibrated oxygen fugacities, ranging from 0

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Zircon saturation model in silicate melts:a review and update

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Acta Geochimica 2020年第3期39卷 387-403页

作者： Tongbin Shao Ying Xia xing ding Yongfeng Cai Maoshuang Song State Key Laboratory of Isotope Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi&Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration Guilin University of TechnologyGuilin 541004China CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101China

Zircon stability in silicate melts-which can be quantitatively constrained by laboratory measurements of zircon saturation-is important for understanding the evolution of magma.Although the original zircon saturation model proposed by Watson and Harrison(Earth Planet Sci Lett 64(2):295-304,1983) is widely cited and has been updated recently,the three main models currently in use may generate large uncertainties due to extrapolation beyond their respective calibrated ranges.This paper reviews and updates zircon saturation models developed with temperature and compositional parameters.All available data on zircon saturation ranging in composition from mafic to silicic(and/or peralkaline to peraluminous)at temperatures from 750 to 1400℃ were collected to develop two refined models(1 and 2) that may be applied to the wider range of compositions.Model 1 is given by lnCZr(melt)=(14.297±0.308)+(0.964 ± 0.066).M-(11113±374)/r,and model 2 given by lnCZr(melt)=(18.99±0.423)-(1.069±0.102)·lnG-(12288±593)/T,where CZr(melt) is the Zr concentration of the melt in ppm and parameters M [=(Na+K+2 Ca)/(Al·Si)](cation ratios) and G [=(3·Al2 O3+SiO2)/(Na2-O+K2 O+CaO+MgO+FeO)](molar proportions)represent the melt composition.The errors are at one sigma,and T is the temperature in Kelvin.Before applying these models to natural rocks,it is necessary to ensure that the zircon used to date is crystallized from the host magmatic rock.Assessment of the application of both new and old models to natural rocks suggests that model 1 may be the best for magmatic temperature estimates of metaluminous to peraluminous rocks and that model 2 may be the best for estimating magmatic temperatures of alkaline to peralkaline rocks.

关键词： Zircon Zircon saturation Model Silicate melt Mafic to silicic melts Peraluminous to peralkaline compositions Igneous rocks Thermometer

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An experimental study on metal precipitation driven by fluid mixing: implications for genesis of carbonate-hosted lead–zinc ore deposits

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Acta Geochimica 2019年第2期38卷 202-215页

作者： Yan Zhang Runsheng Han xing ding Junjie He Yurong Wang Geological Survey Center for Non-ferrous Mineral Resources Kunming University of Science and Technology State Key Laboratory of Isotope Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences CAS Center for Excellence in Tibetan Plateau Earth Sciences Key Laboratory of Mineralogy and Metallogenic Guangzhou Institute of Geochemistry Chinese Academy of Sciences University of Chinese Academy of Sciences

A type of carbonate-hosted lead–zinc(Pb–Zn)ore deposits, known as Mississippi Valley Type(MVT)deposits, constitutes an important category of lead–zinc ore deposits. Previous studies proposed a fluid-mixing model to account for metal precipitation mechanism of the MVT ore deposits, in which fluids with metal-chloride complexes happen to mix with fluids with reduced sulfur, producing metal sulfide deposition. In this hypothesis, however, the detailed chemical kinetic process of mixing reactions, and especially the controlling factors on the metal precipitation are not yet clearly stated. In this paper, a series of mixing experiments under ambient temperature and pressure conditions were conducted to simulate the fluid mixing process, by titrating the metal-chloride solutions, doping withor without dolomite, and using NaHS solution. Experimental results, combined with the thermodynamic calculations, suggest that H_2S, rather than HS^-or S^(2-),dominated the reactions of Pb and/or Zn precipitation during the fluid mixing process, in which metal precipitation was influenced by the stability of metal complexes and the pH. Given the constant concentrations of metal and total S in fluids, the pH was a primary factor controlling the Pb and/or Zn metal precipitation. This is because neutralizing or neutralized processes for the ore-forming fluids can cause instabilities of Pb and/or Zn chloride complexes and re-distribution of sulfur species, and thus can facilitate the hydrolysis of Pb and Zn ions and precipitation of sulfides. Therefore, a weakly acidic to neutral fluid environment is most favorable for the precipitation of Pb and Zn sulfides associated with the carbonate-hosted Pb–Zn deposits.

关键词： Metal precipitation Fluid mixing Sulfur species MVT lead-zinc ore deposits Carbonate-hosted lead-zinc deposits

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Major Miocene geological events in southern Tibet and eastern Asia induced by the subduction of the Ninetyeast Ridge

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Acta Geochimica 2018年第3期37卷 395-401页

作者： Xinlei Sun Wei-dong Sun Yong-bin Hu Wei ding Trevor Ireland Mei-zhen Zhan Ji-qiang Liu Ming-xing Ling xing ding Zhao-feng Zhang Wei-ming Fan State Key Laboratory of Isotope Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640 China Center of Deep Sea Research Institute of OceanographyChinese Academy of Sciences Qingdao 266071 China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237 China CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences Beijing 100101China CAS Key Laboratory of Mineralogy and Metallogeny Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China University of the Chinese Academy of Sciences Beijing 100049 China Research School of Earth Sciences The Australian National University Canberra ACT 2601 Australia

Cenozoic adakitic rocks in the Gangdese changed from barren continental melts to ore-forming slab melts at * 23 Ma. The distribution and chemical characteristics of the ore-forming adakites point to an association with the Ninetyeast Ridge. The subduction of the thick,rigid Ninetyeast Ridge changed the geometry and rheology of the eastern Tibetan Plateau lithosphere and asthenosphere, restrained the eastward escape of asthenospheric mantle as well as continental fragments, and promoted the uplift and building of the Tibetan Plateau, which consequently changed the tectonic and climatic regimes in eastern Asia.

关键词： Ridge subduction Eastern Tibetan Plateau Cenozoic mineralization Seismic anomaly

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