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High-pressure synchrotron x-ray diffraction and Raman spectroscopic study of plumbogummite

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Chinese Physics B 2018年第1期27卷 541-546页

作者：康端巫翔袁冠黄圣轩牛菁菁高静秦善 key laboratory of Orogenic Belts and Crustal Evolution Ministry of Education School of Earth and Space SciencesPeking University state key laboratory of geological processes and mineral resources China University of Geosciences

PbA13（PO4）2（OH,H20）6, an important environmental mineral, is in-situ studied by synchrotron x-ray diffraction （XRD） and Raman scattering combined with diamond anvil cells （DACs） at pressures up to - 11.0 GPa and room temper- ature. The XRD results indicate that plumbogummite does not undergo a phase transition between 0 GPa and 10.9 GPa. Moreover, the c axis is more compressible than the a axis, revealing its anisotropic behavior. The pressure-volume data are fitted to the third-order Birch-Murnaghan equation of state to yield the plumbogummite bulk modulus K0 of 68（ I ） GPa and KU of 6.1. The [PO4]3 and [HPO4]2 Raman vibrational modes exhibit scale nearly linearly as a function of pressure. The [PO4]3 stretching modes are generally more sensitive to pressure than the bending modes. The Grfineisen parameters range from -0.07 to 1.19, with an arithmetic mean of approximately 0.39.

关键词： plumbogummite equation of state Grfineisen parameter diamond anvil cell

Tectonic evolution of the Qinling-Tongbai orogenic belt

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Tectonic evolution of the Qinling-Tongbai orogenic belt

Timing,scale and mechanism of the destruction of the North china Craton

中国矿物岩石地球化学学会第13届学术年会

作者： wu Yuan-bao~1,ZHENG Yong-fei~2 1.state key laboratory of geological processes and mineral resources,faculty of earth sciences,china university of geosciences, wuhan 43.074,china 2.CAS key laboratory of Crust-Mantle Materials and Environments,School of earth and Space sciences,university of Science and Technology of china,Hefei 230026,china

＜正＞The Qinling-Tongbai-Dabie-Sulu orogenic belt marks the suture between the North and South china Blocks in Central china,forming one of the most important orogens in the eastern *** are hot controversies about the location and number of sutures and the timing of arc-continent and continent-continent collisions during the convergence between the North and South china *** Dabie-Sulu orogenic belt is characterized by the occurrence of Triassic UHP eclogite-facies metamorphic rocks due to the Triassic continental deep subduction. Thus,the Triassic continent-continent collision is evident in east-central *** the other hand,there are Paleozoic events of arc-continent collision in the Qinling-Tongbai orogenic belt that were overprinted by the Triassic process of continental *** has caused much complexity on the time and location of arc-continent and continent-continent collisions between the North and South china *** present an

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Timing,scale and mechanism of the destruction of the North C...

New paleomagnetic results from the Yangzhuang Formation of the Jixian System, North china, and tectonic implications

中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： ZHU RiXiang~(1*),CHEN Ling~1,wu FuYuan~1 & LIU JunLai~2 1 state key laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of sciences,Beijing 100029,china 2 state key laboratory of geological processes and mineral resources,china university of geosciences,Beijing 100083,china

The North china Craton(NCC) is a classical example of ancient destroyed *** the initiation of the North china Craton Destruction Project by the National Natural Science Foundation of china,numerous studies have been conducted on the timing,scale,and mechanism of this destruction through combined interdisciplinary *** data suggest that the destruction occurred mainly in the eastern NCC,whereas the western NCC was only locally *** sedimentation, magmatic activities and structural deformation after cratonization at -1.8 Ga indicate that the NCC destruction took place in the Mesozoic with a peak age of ca 125 Ma.A global comparison suggests that most cratons on earth are not destroyed,although they have commonly experienced lithospheric thinning;destruction is likely to occur only when the craton has been disturbed by oceanic *** destruction of the NCC was coincident with globally active plate tectonics and high mantle temperatures during the *** subducted Pacific slab destabilized mantle convection beneath the eastern NCC,which resulted in cratonic destruction in the eastern *** and/or thermal-mechanical-chemical erosion resulted from the destabilization of mantle convection.

关键词： timing scale and mechanism craton destruction North china Craton

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Science Bulletin 2005年第14期 77-83页

作者： wu Huaichun1, ZHANG Shihong1, LI Zheng-Xiang2, LI Haiyan1 & DONG Jin1 1. state key laboratory of geological processes and mineral resources & key laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education, china university of Geosci- ences, Beijing 100083, china 2. Tectonics Special Research Centre, School of earth and Geographical sciences, The university of Western Australia, Crawley, WA 6009, Australia

A paleomagnetic study was carried out on the Yangzhuang Formation （1350 Ma） of the Jixian System in the North china Block （NCB）. Detailed stepwise thermal demagnetization isolated two components. The soft compo- nent （component A） was interpreted as a remagnetization in the recent geomagnetic field. The hard component （compo- nent B） with higher unblocking-temperatures was carried by hematite. Its site-mean direction is D/I = 77.6°/-24.3° （κ = 5.4, α95 = 18.3°, N = 15 sites） before, and D/I = 72.2°/11.5° （κ = 24.6, α95 = 7.9°） after tilt correction. It passes a fold test （Mesozoic folding） at 99% confidence level and reversal test at 95% confidence level. The corresponding pole locates at 17.3°N, 214.5°E （dp = 4.1°, dm = 8.0°）. A best fit of paleo- magnetic poles from the NCB, Baltica, Siberia and the ap- parent polar wander path for Laurentia suggests a long-lived connection between these paleo-continents between1800 and 1350 Ma.

关键词： North china Block Yangzhuang Formation paleomag- netism Mesoproterozoic Rodinia Columbia.

Silurian granulite-facies metamorphism,and coeval magmatism and crustal growth in the Tongbai orogen,central china

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Silurian granulite-facies metamorphism,and coeval magmatism ...

Late Mesozoic Exhumation of the Huangling Massif:Constraints on the Evolution of the Middle Yangtze River

中国矿物岩石地球化学学会第13届学术年会

作者： WANG Hao~1,wu Yuan-bao~(1,2),GAO Shan~1,ZHANG Hong-fei~1, LIU Xiao-chi~1,GONG Hu-jun~2,PENG Min~3,WANG Jing~4,YUAN Hong-lin~2 1.state key laboratory of geological processes and mineral resources,faculty of earth sciences,china university of geosciences, wuhan 43.074,china 2.state key laboratory of Continental Dynamics,Department of Geology,Northwest university,Xi’an 710069,china 3.Institute of Geophysical and Geochemical Exploration CAGS,Langfang 065000,china 4.Anhui Institute of Geology,Hefei 230001,china

It is intriguing whether the formation of granulite in an orogenic belt is related to magmatism and crustal *** Tongbai orogen is one of the particular areas in the Qinling-Tongbai-Dabie-Sulu orogen that contains both granulites and associated arc magmatic rocks,and thus is an optimal place to address this ***,the formation age and genesis of the granulites and their relations to the magmatic rocks have not yet been well *** situ LA(MC)-ICPMS U-Pb dating,and trace element and Lu-Hf isotope analyses were undertaken on zircon grains from gneiss,granulite,gabbro and granodiorite *** zircons in three granulite samples and a gneiss sample have core-rim *** cores have oval or rounded shapes,oscillatory zones,high Th/U ratios and variable U-Pb ages,suggesting a detrital *** youngest group of the detrital zircons yields a weighted mean pb/U age of(450-±5) Ma,which is interpreted as the maximum depositional age of their protoliths.A major age cluster is ca.450～490 Ma,corresponding to prolonged arc magmatism in the northern Tongbai and Qinling *** group of ages range from 660 to 950 Ma,implying that the Qinling Group

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Acta Geologica Sinica(English Edition) 2024年第1期98卷 250-264页

作者： SU Jianchao LIN Xu LI Chang’an Jolivet MARC wu Lin CHENG Feng DENG Bin wu Zhonghai CHEN Xiaokang HU Chengwei School of Geography and Information Engineering China University of GeosciencesWuhan 430074China College of Civil Engineering and Architecture China Three Gorges UniversityYichangHubei 443002China Géosciences Rennes CNRS-UMR6118Univ RennesRennesFrance state key laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBejing 100029China key laboratory of Orogenic Belts and Crustal Evolution Ministry of EducationSchool of Earth and Space SciencesPeking UniversityBeijing 100871China state key laboratory of Oil and Gas Reservoir Geology and Exploitation/Chengdu university of Technology Chengdu 100871China Institute of geological Mechanics Chinese Academy of Geological ScienceBeijing 100081China

Plate subduction leads to complex exhumation processes on *** Huangling Massif lies at the northern margin of the South china *** the Huangling Massif was exhumed as a watershed of the middle reaches of the Paleo-Yangtze River during the Mesozoic remains under *** examined the exhumation history of the Huangling Massif based on six granite bedrock samples,using apatite fission track(AFT)and apatite and zircon(U-Th)/He(AHe and ZHe)*** samples yielded ages of 157–132 Ma(ZHe),119–106 Ma(AFT),and 114–72 Ma(AHe),*** modeling revealed that three phases of rapid cooling occurred during the Late Jurassic–Early Cretaceous,late Early Cretaceous,and Late *** exhumation processes led to the high topographic relief responsible for the emergence of the Huangling *** integrated of our new data with published sedimentological records suggests that the Huangling Massif might have been the watershed of the middle reaches of the Paleo-Yangtze River since the *** that time,the rivers flowed westward into the Sichuan Basin and eastward into the Jianghan *** subduction of the Pacific Plate beneath the Asian continent in the Mesozoic deeply influenced the geomorphic evolution of the South china Block.

关键词： apatite zircon (U-Th)/He fission track Huangling Massif Yangtze River

Structural Stability of Natural Magnesiochromite at High-Temperature-Pressure Conditions

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Journal of earth Science 2024年第4期35卷 1196-1203页

作者： Shuyu Jin Xiang wu Yungui Liu Yanfei Zhang Chao Wang state key laboratory of geological processes and mineral resources China University of GeosciencesWuhan430074China College of Gems and Materials Hebei GEO UniversityShijiazhuang050031China

The podiform chromitites in the Luobusha ophiolite have been thought to experience a very deep formation,but the maximum depth is still an open ***,we have investigated the structural stability of natural magnesiochromite using the synchrotron-based powder X-ray diffraction and diamond anvil cells up to 48.6 GPa and 2450 *** results have shown that spinel-type magnesiochromite first decomposes into corundum-type‘Cr_(2)O_(3)’+B1-type‘MgO’at 11–14 GPa and 1250–1450 K,then modified ludwigite(mLd)-type‘Mg_(2)Cr_(2)O_(5)’+corundum-type‘Cr_(2)O_(3)’at 14.3–20.5 GPa and 1300–2000 K,and finally CaTi_(2)O_(4)-type phase at 24.5 *** the quenching procession from high-temperature-pressure conditions,the mLd-type phase appeared again and was kept at ambient *** also obtained the isothermal equation states of spinel-type and CaTi_(2)O_(4)-type phases,revealing the composition effect on their *** on the updated results,we propose chromitites could not experience pressure exceeding∼14.3 GPa(approximate maximum depth∼400 km)in the subduction-recycling genesis model.

关键词： chromite high-temperature and high-pressure phase transitions equation of state chromitites genesis

Mars exploration——In situ K-Ar dating of jarosite

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Science china earth sciences 2024年第3期67卷 641-656页

作者： Jing YANG Dewen ZHENG Ying wu Hong CHEN Li YANG Bin ZHANG key laboratory of Active Tectonics and geological Safety Ministry of Natural ResourcesInstitute of GeomechanicsChinese Academy of Geological SciencesBeijing 100081China state key laboratory of earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China Institute of earth sciences China University of GeosciencesBeijing 100083China key laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029Chin

To accurately determine the chronological framework of climatic variations recorded by various Martian terrains, the absolute ages of Martian events and cratering rate need to be constrained by either in situ dating or returned samples. In situ K-Ar dating is currently a more plausible dating technique as compared with sample return. Jarosite(KFe_(3)[SO_(4)]_(2)[OH]_(6)) is the only confirmed K sulfate mineral that is widely present on Mars, as indicated by in situ detection, orbital remote sensing, and meteorite studies. Jarosite can be used for precise K-Ar and (40)Ar/(39)Ar dating. The preservation of jarosite on Mars provides information about the nature and duration of aqueous processes on the Martian surface. Different ages of Martian jarosite represent the key to constraining the transition from Martian surface water activity to arid climatic conditions. This paper summarizes recent advances in our knowledge of the spatial distribution of Martian jarosite, its mineralogical properties and stability on Mars, the Ar diffusion kinetics of jarosite, and the current status of in situ K-Ar dating. Moreover, we examine the key scientific issues to be addressed for in situ K-Ar dating of jarosite and Martian sample return missions, and discuss future research directions.

关键词： Mars Jarosite In situ K-Ar dating Ar diffusion Stability

SHRIMP zircon U-Pb dating for two episodes of migmatization in the Dabie orogen

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Chinese Science Bulletin 2007年第13期52卷 1836-1842页

作者： wu yuanbao TANG Jun ZHANG ShaoBing ZHAO ZiFu state key laboratory of geological processes and mineral resources Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China CAS key laboratory of Crust-Mantle Materials and Environments School of Earth and Space Sciences University of Science and Technology of China Hefei 230026 China Beijing SHRIMP Center Chinese Academy of Geological Sciences Beijing 100037 China

Zircon CL imaging and SHRIMP U-Pb dating were carried out for migmatite in the Dabie orogen. Zircons from the Manshuihe migmatite show clear core-rim structures. The cores display sector or weak zoning and low Th/U ratios of 0.01 to 0.17, indicating their precipitation from metamorphic fluid. They yield a weighted mean age of 137±5 Ma. By contrast, the rims exhibit planar or nebulous zoning with relatively high Th/U ratios of 0.35 to 0.69, suggesting their growth from metamorphic melt. They give a weighted mean age of 124±2 Ma. Zircons from the Fenghuangguan migmatite also display core-rim structures. The cores are weakly oscillatory zoned or unzoned with high Th/U ratios of 0.21 to 3.03, representing inherited zircons of magmatic origin that experienced different degrees of solid-state recrystallization. SHRIMP U-Pb analyses obtain that its protolith was emplaced at 768±12 Ma, consistent with middle Neoproterozoic ages for protoliths of most UHP metaigneous rocks in the Dabie-Sulu orogenic belt. By contrast, the rims do not show significant zoning and have very low Th/U ratios of 0.01 to 0.09, typical of zircon crystallized from metamorphic fluid. They yield a weighted 206Pb/238U age of 137±4 Ma. Taking the two case dates together, it appears that there are two episodes of zircon growth and thus migmati-tization at 137±2 Ma and 124±2 Ma, respectively, due to metamorphic dehydration and partial melting. The appearance of metamorphic dehydration corresponds to the beginning of tectonic extension thus to the tectonic switch from crustal compression to extension in the Dabie orogen. On the other hand, the partial melting is responsible for the extensional climax, resulting in formation of coeval migmatite, granitoid and granulite. They share the common protolith, the collision-thickened continental crust of mid-Neoproterozoic ages.

关键词：混合岩锆石脱水处理溶解作用