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Age and petrogenesis of the newly discovered Early Permian granite in the Kumtor gold field， Kyrgyz Tien-Shan

Journal of Earth Science 2024年

作者： Kyiazbek Asilbekov Rustam Orozbaev Etienne Skrzypek christoph hauzenberger Elena Ivleva Daniela Gallhofer Jian-Feng Gao Nikolay Pak Anatoliy Shevkunov Anatoliy Bashkirov Aizat Zhaanbaeva Institute of Geology， National Academy of Sciences of the Kyrgyz Republic Institute of Earth Sciences， University of Graz State Key Laboratory of Ore Deposit Geochemistry， Institute of Geochemistry， Chinese Academy of Sciences Kumtor Gold Company CJSC

Permian intrusions are widespread in the Middle and Southern Tien Shan， with fewer occurrences in the Northern Tien-Shan. Notably， many of these intrusions are spatially associated with a variety of ore deposits， indicating a significant link between magmatic activity and mineralization processes in these areas. We studied granite samples recently recovered from drilling in the Kumtor gold field to evaluate their potential relationships with gold mineralization. We report major and trace element geochemistry， zircon U-Pb age and Hf isotope data for this so-called Kumtor granite. The Kumtor granite is metaluminous to peraluminous and belongs to the high-K and calc-alkaline series with I-type geochemical characteristics. The relatively high K2O and Na2O concentrations and low high field strength elements （HFSE） and heavy rare earth elements （HREE）， the presence of biotite within these I-type granites， together with their low zircon saturation temperatures （731–779 °C）， suggest that they were likely derived from a hydrous source formed by dehydration melting of mica-bearing， medium- to high-K metabasaltic rocks. Our zircon U-Pb dating results indicate that the Kumtor granite intruded at 293 ± 1.7 Ma， which is consistent with the age range of other Middle Tien-Shan granitoids. The zircon Hf isotopic composition is εHf（t）= –7.56 to –5.05， indicating an ancient （1.39 to 1.52 Ga） crustal origin. Petrographical， geochemical and geochronological data indicate that the Kumtor granite is similar to leuco-granites of the Terekty complex. Our results indicate that the Kumtor granite was emplaced in the early Permian in a post-collision setting and may have temporal and genetic relationships with gold mineralization.

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Geochemical Characteristics and New Eruption Ages of Ruby-Related Basalts from Southeast Kenya

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Journal of Earth Science 2014年第5期25卷 799-821页

作者： Tawatchai Chualaowanich Chakkaphan Sutthirat Visut Pisuttha-Arnond christoph hauzenberger Chinghua Lo Tongyi Lee Punya Charusiri Department of Geology Chulalongkorn University Patumwan Department of Mineral Resources Rama VI Rd. Ratchathewi Department of Earth Sciences Karlz-Fan University of Graz Department of Geoscience National Taiwan University Department of Earth Science National Taiwan Normal University

Two ruby-related basaltic fields were recently discovered in the southeast region of Kenya, exposed in the Nguu and Ngulai Hills vicinities. These fields host abundant deep-seated xenoliths, including corundum-bearing granulites. The basalts are alkaline affinity having compositions from foidrite to basanite. The Ngulai basalts have a wider range of SiO2（38.2 wt.%-44.8 wt.%） covering those of the Nguu basalts（38.7 wt.%-42.3 wt.%）. This overlapping behavior also holds for other major oxides and trace elements, e.g., Al2O3, Na2 O, K2 O, Cr, Ni, Rb and Ga. The overall OIB-like incompatible patterns with strong K depletion and slight spike of Ti enrichment signatures imply low degrees of partial melting of the upper mantle region source induced under a mantle plume-related process. The K-depletion signature indicates a residual K-bearing phase still retained in the source domain. Chondrite-normalized REE patterns exhibiting strong LREE enrichment without Eu anomalies suggest that plagioclase fractionation is insignificant. New 40Ar/39 Ar ages indicate eruption events occurred during the Pleistocene times, which are around 2 Ma for the Ngulai basalts and 0.9 to 1.6 Ma for the Nguu basalts. Clinopyroxene-basalt thermobarometric calculations yield the equilibrium P-T ranges of -8-29 kbar and 1 200-1 450 ℃.

关键词： ruby-related Cenozoic basalt Ar/Ar age corundum-bearing xenolith Kenya Nguu,Ngulai.

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Origin and Petrogenetic Implications of Spessartine Garnet in Highly-Fractionated Granite from the Central Eastern Desert of Egypt

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Acta Geologica Sinica(English Edition) 2020年第3期94卷 763-776页

作者： Mabrouk SAMI Theodoros NTAFLOS Haroun A.MOHAMED Esam S.FARAHAT christoph hauzenberger Nasser M.MAHDY Khaled M.ABDELFADIL Douaa FATHY Geology Department Faculty of ScienceMinia UniversityEl-Minia 61519Egypt Department of Lithospheric Research University of ViennaAlthanstrasse 14A-1090 ViennaAustria Institute of Mineralogy and Petrology Karl-Franzens UniversityGrazAustria Nuclear Materials Authority P.O.530El-MaadiCairoEgypt Geology Department Faculty of ScienceSohag UniversityEgypt

A highly-fractionated garnet-bearing muscovite granite represents the marginal granitic facies of the Abu-Diab multiphase pluton in the Central Eastern Desert of Egypt. New electron microprobe analyses(EMPA) and laser ablation inductively coupled plasma mass spectrometry(LA-ICP-MS) data from garnets are reported, in order to constrain their origin and genesis. Garnet in the Abu-Diab host granite is euhedral to subhedral, generally homogeneous and, in rare cases, it shows weak zonation. The garnet contains appreciable amounts of MnO and FeO, with lesser amounts of MgO and CaO, yielding an end-member formula of Sps61–72Alm25–35Prp1–4Adr0–1. Moreover, it is depleted in large ion lithophile elements(LILE) with lower values of Ba, Nb and Sr relative to the primitive mantle. Additionally, it contains high concentrations of HREE and Y and their REE pattern shows strong negative Eu anomalies. The garnet was crystallized under relatively low temperature(646°C–591°C) and pressure(< 3 kbar) conditions. The textural and chemical features indicate that the garnet is magmatic in origin and is chemically similar to that from highly-fractionated A-type granite. It was probably formed at the expense of biotite in a highly-evolved MnO-rich magma and/or by hydroxyl complexing of Mn during the ascending fluid phases.

关键词： spessartine garnet LA-ICP-MS A-type granite Abu-Diab Egypt

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Metamorphic stages in mountain belts during a Wilson cycle:A case study in the central Sanandaj-Sirjan zone(Zagros Mountains,Iran)

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Geoscience Frontiers 2022年第2期13卷 430-459页

作者： Farzaneh Shakerardakani Franz Neubauer Manfred Bernroider Fritz Finger christoph hauzenberger Johann Genser Michael Waitzinger Behzad Monfaredi Department of Geography and Geology Paris-Lodron University of SalzburgHellbrunner Str.34A-5020 SalzburgAustria State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China Department of Chemistry and Physics of Materials Paris-Lodron University of SalzburgAustria Institute of Earth Sciences-NAWI Graz Geocenter University of GrazUniversitatsplatz 2Graz 8010Austria

Polymetamorphic units are important constituents of continent-continent collisional orogens,and rift metamorphic assemblages are often overprinted by subsequent metamorphism during subduction and *** study reports the metamorphic conditions and evolution of the Dorud-Azna metamorphic units in the central part of the Sanandaj-Sirjan zone(SSZ),***,new geothermobarometry results are integrated with ^(40)Ar/^(39)Ar mineral and Th-U-Pb monazite and thorite ages to provide new insight of polyphase metamorphism in the two different basement units of the SSZ,the lower Galeh-Doz orthogneiss and higher Amphibolite-Metagabbro *** the Amphibolite-Metagabbro unit,staurolite micaschist underwent a prograde P-T evolution from 640±20℃/6.2±0.8 kbar in garnet cores(M1)to 680±20℃/7.2±1.0 kbar in garnet rims(M2).Three Th-U-Pb monazite ages of 306±5 Ma,322±28 Ma and 336±39 Ma from the garnet-micaschists testify the Carboniferous age of M1 *** the same unit,the metagabbro records P-T conditions of 4.0±0.8 kbar and 580±50℃ in the(magmatic)amphibole core(Late Carboniferous intrusion)to 7.5±0.7 kbar and 700±20℃ in the amphibole rim indicating a prograde P-T path during subsequent burial(M1).New ^(40)Ar/^(39)Ar dating of white mica from the staurolite micaschist yielded a staircase pattern ranging from 36±12 Ma to 170±2 *** implies polymetamorphism with a minimum Late Jurassic cooling age through the Ar retention temperature of ca.425±25℃ after M2 metamorphism and a Paleogene low-grade metamorphic overprint(M3),while ^(40)Ar/^(39)Ar white mica dating of garnet micaschist yielded a plateau age of 137.84±0.65 *** therefore interpret the amphibolite-grade metamorphism M2 to have predated 170 Ma and is likely between 180 and 200 ***,it is overprinted at about 36 Ma under retrogressive low-grade M3 metamorphism(at temperatures of~350-240℃)during final shortening and *** the underlying Galeh-Doz unit,the Panafrican granitic orthogneiss i

关键词： Carboniferous Polyphase metamorphism Petrochronology Chemical Th-U-Pb age dating ^(40)Ar/^(39)Ar dating Collisional orogen

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Interleukin-10 gives exhausted chimeric antigen receptor(CAR)T cells a second breath

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Cancer Communications 2024年第7期44卷 787-790页

作者： christoph Heuser-Loy Leibniz Institute for Immunotherapy Division for Functional Immune Cell ModulationRegensburgGermany

Adoptive cell therapy(ACT)represents a major pillar of modern *** or synthetically endowed with the ability to recognize tumor-associated antigens,tumor-infiltrating lymphocytes(TILs)or T cells engineered to transgenically express T cell receptors or chimeric antigen receptors(CARs)are expanded and infused to tumor patients to lyse tumor ***,despite tremendous response rates against liquid tumors,many patients undergo relapses,and treatment outcomes in solid tumors have been disappointing so far[1].The harsh tumor microenvironment,including nutrient deprivation,acidification,hypoxia,and immunosuppressive signals[2,3],in conjunction with persistent antigen stimulation triggers a program of exhaustion in T cells(Figure 1A).Exhausted T cells exhibit reduced cytotoxicity and minimal proliferation potential,physiologically balancing tissue health with control of chronic viral infection or of tumor growth[4,5].Strategies to disengage or rewire the“erroneously”deployed exhaustion program to exploit the full potential of tumor-fighting T cells are highly sought after(Figure 1B).

关键词： Interleukin stimulation Figure

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Implementation and validation of a bonded particle model to predict rheological properties of viscoelastic materials

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Particuology 2024年第6期89卷 198-210页

作者： Michael Mascara Arno Mayrhofer Stefan Radl christoph Kloss Institute of Process and Particle Engineering Graz University of TechnologyInffeldgasse 13Graz8010Austria DCS Computing GmbH Industriezeile 35Linz4020Austria

This work focuses on implementing a particle-based method able to characterize viscoelastic materials whose rheological properties,such as storage modulus G′and loss modulus G″,are *** is based on the bonded particle model,with the elastic constitutive relation here substituted with a viscoelastic one to capture time-scale *** Burgers model,vastly used in literature to model viscoelastic systems,is discretized and *** test case used for calibration comprises of a cubic lattice,sheared with a periodic motion,to mimic the effect of a shear *** appropriate filtering of the stress response,the rheological properties are obtained,highlighting the effect of the lattice geometry,as well as the particle size,on the accuracy of the ***,the Burgers parameters are calibrated by analytically fitting the experimental dataset,showing the limitation of the Burgers *** micro-contact parameters are obtained from the macro parameters through appropriate *** completing a frequency sweep,the simulated G′and G″show a relatively large error,around 25%for G’for *** this reason,a more robust model,namely the generalized Maxwell model,has been *** calibration procedure is performed in the same fashion as for the Burgers ***,the tangential micro-contact parameters are scaled *** normal *** scaling parameter,calledα,is calibrated by minimizing the root mean square error between simulation and experimental data,giving errors below 10%in both G′and G″for a large ***,a full ring plate-plate rheometer setup is simulated,and the simulation is compared with the given experimental dataset,again finding a good agreement.

关键词： DEM Rheology Numerical modeling Viscoelasticity

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Spatial impact of digital finance on carbon productivity

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Geoscience Frontiers 2024年第3期15卷 358-372页

作者： Huaping Sun Tingting Chen christoph Nedopil Wang School of Finance and Economics Jiangsu UniversityZhenjiangChina School of Economics and Management University of Science and Technology BeijingBeijingChina Fanhai International School of Finance Fudan UniversityShanghaiChina

Low carbon productivity has been identified as a key direction for China’s future *** an important driving force for economic growth,the question of whether digital finance that is reliant on digital technology can support the development of a low-carbon urban economy remains *** on the carbon productivity measured by panel data from 201 cities for the period 2011-2020,this study applies the spatial Dubin model and threshold regression model to explore the impact of digital finance on carbon productivity,yielding the following key ***,the spatial distribution heterogeneity of carbon productivity in China’s eastern region is higher than that in the western region,and both productivity and digital finance are characterized by high(low)-high(low)dotted spatial ***,digital finance can significantly improve carbon productivity via two transmission channels:the human capital and marketization *** the same time,digital finance exerts a spatial spillover effect on carbon productivity,and rising local digital finance levels will increase carbon productivity in neighboring *** analysis indicates that the spillover effect of digital finance in urban agglomerations and eastern regions is more ***,fixed-asset investment has a positive nonlinear moderating effect on digital finance,thus improving carbon *** the per capita investment in fixed assets does not exceed 682.73 yuan,digital finance exerts only a limit pulling effect on carbon productivity;when it is higher than this value,the pulling effect is intensified.

关键词： Digital finance Carbon productivity Spatial spillover effect Fixed-asset investment Spatial heterogeneity

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Conception of a new 4-quadrant hydrogen compressed air energy storage power plant with an integrated electrolyzer

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Energy Reviews 2024年第3期3卷 92-101页

作者： Hans-Peter Beck Ann-Kathrin Klaas christoph Klaas Research Center Energy Storage Technologies Clausthal University of TechnologyAm Stollen 19A38640GoslarGermany Institute of Electrical Power Engineering and Energy Systems Clausthal University of TechnologyLeibnizstraße 2838678Clausthal-ZellerfeldGermany

A hydrogen compressed air energy storage power plant with an integrated electrolyzer is ideal for large-scale,long-term energy storage because of the emission-free operation and the possibility to offer multiple ancillary services on the German energy *** paper defines analyzes such a storage concept and conducts an extensive comparison with four additional storage concepts based on various *** results show that the combination of storing compressed air and hydrogen offers a higher efficiency than storing only hydrogen and lower specific investment costs than storing only compressed *** result is confirmed with analysis of the optimal sizing of each power plant component for simultaneous participation on multiple energy markets with a linear optimization dispatch *** hydrogen compressed air energy storage(HCAES)power plant can utilize more revenue possibilities than a hydrogen energy storage because of the higher round-trip efficiency and the combination of the air compressor and the integrated electrolyzer during charging *** integration of the electrolyzer,however,offers a couple of challenges itself because of the highly flexible operation mode.A new concept for the controllable 24-pulse diode-thyristor rectifier of the electrolyzer is presented,that uses mostly common components while offering little to no grid harmonics and a long *** flexible integrated electrolyzer allows for the 4-quadrant operation of the storage power plant.

关键词： Long-term energy storage Hydrogen energy storage Compressed air energy storage Mixed-integer linear programming Electrolyzer 24-Pulse thyristor rectifier

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Recycled graphite for more sustainable lithium-ion batteries

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Carbon Energy 2024年第5期6卷 15-24页

作者： Mayokun Olutogun Anna Vanderbruggen christoph Frey Martin Rudolph Dominic Bresser Stefano Passerini Helmholtz Institute Ulm(HIU) Ulm Germany Karlsruhe Institute of Technology(KIT) KarlsruheGermany Helmholtz Zentrum Dresden-Rossendorf(HZDR) Helmholtz Institute Freiberg for Resource Technology(HIF)FreibergGermany ProGraphite GmbH UntergriesbachGermany Chemistry Department Sapienza University of RomeRomeItaly

The demand for lithium-ion batteries(LIBs)is driven largely by their use in electric vehicles,which is projected to increase dramatically in the *** great success,however,urgently calls for the efficient recycling of LIBs at the end of their ***,we describe a froth flotation-based process to recycle graphite—the predominant active material for the negative electrode—from spent LIBs and investigate its reuse in newly assembled *** has been found that the structure and morphology of the recycled graphite are essentially unchanged compared to pristine commercial anode-grade graphite,and despite some minor impurities from the recycling process,the recycled graphite provides a remarkable reversible specific capacity of more than 350 mAh g^(−1).Even more importantly,newly assembled graphite‖NMC532 cells show excellent cycling stability with a capacity retention of 80%after 1000 cycles,that is,comparable to the performance of reference full cells comprising pristine commercial graphite.

关键词： anode graphite lithium-ion battery recycling sustainability

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Machine learning prediction of methane,ethane,and propane solubility in pure water and electrolyte solutions:Implications for stray gas migration modeling

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Acta Geochimica 2024年第5期43卷 971-984页

作者： Ghazal Kooti Reza Taherdangkoo Chaofan Chen Nikita Sergeev Faramarz Doulati Ardejani Tao Meng christoph Butscher Institute of Geotechnics TU Bergakademie FreibergGustav-Zeuner-Str.109599 FreibergGermany Department of Petroleum Engineering Amirkabir University of TechnologyTehranIran Freiberg Center for Water Research ZeWaF TU Bergakademie Freiberg09599 FreibergGermany School of Mining College of EngineeringUniversity of TehranTehranIran Taiyuan University of Science and Technology Taiyuan 030024China

Hydraulic fracturing is an effective technology for hydrocarbon extraction from unconventional shale and tight gas reservoirs.A potential risk of hydraulic fracturing is the upward migration of stray gas from the deep subsurface to shallow *** stray gas can dissolve in groundwater leading to chemical and biological reactions,which could negatively affect groundwater quality and contribute to atmospheric *** knowledge oflight hydrocarbon solubility in the aqueous environment is essential for the numerical modelling offlow and transport in the ***,we compiled a database containing 2129experimental data of methane,ethane,and propane solubility in pure water and various electrolyte solutions over wide ranges of operating temperature and *** machine learning algorithms,namely regression tree(RT)and boosted regression tree(BRT)tuned with a Bayesian optimization algorithm(BO)were employed to determine the solubility of *** predictions were compared with the experimental data as well as four well-established thermodynamic *** analysis shows that the BRT-BO is sufficiently accurate,and the predicted values agree well with those obtained from the thermodynamic *** coefficient of determination(R2)between experimental and predicted values is 0.99 and the mean squared error(MSE)is 9.97×10^(-8).The leverage statistical approach further confirmed the validity of the model developed.

关键词： Gas solubility Hydraulic fracturing Thermodynamic models Regression tree Boosted regression tree Groundwater contamination

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