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STCF conceptual design report (Volume 1): Physics & detector

Frontiers of physics 2024年第1期19卷 1-154页

作者： M.Achasov x.C.Ai L.P.An R.Aliberti Q.An x.Z.Bai Y.Bai O.Bakina A.Barnyakov V.Blinov V.Bobrovnikov D.Bodrov A.Bogomyagkov A.Bondar I.Boyko Z.h.Bu F.M.Cai h.Cai J.J.Cao Q.h.Cao x.Cao Z.Cao Q.Chang K.T.Chao D.Y.Chen h.Chen h.x.Chen J.F.Chen K.Chen L.L.Chen P.Chen S.L.Chen S.M.Chen S.Chen S.P.Chen W.Chen x.Chen x.F.Chen x.R.Chen Y.Chen Y.Q.Chen h.Y.Cheng J.Cheng S.Cheng T.G.Cheng J.P.Dai L.Y.Dai x.C.Dai D.Dedovich A.Denig I.Denisenko J.M.Dias D.Z.Ding L.Y.Dong W.h.Dong V.Druzhinin D.S.Du Y.J.Du Z.G.Du L.M.Duan D.Epifanov Y.L.Fan S.S.Fang Z.J.Fang G.Fedotovich C.Q.Feng x.Feng Y.T.Feng J.L.Fu J.Gao Y.N.Gao P.S.Ge C.Q.Geng L.S.Geng A.Gilman L.Gong T.Gong B.Gou W.Gradl J.L.Gu A.Guevara L.C.Gui A.Q.Guo F.K.Guo J.C.Guo J.Guo Y.P.Guo Z.h.Guo A.Guskov K.L.han L.han M.han x.Q.hao J.B.he S.Q.he x.G.he Y.L.he Z.B.he Z.x.heng B.L.hou T.J.hou Y.R.hou C.Y.hu h.M.hu K.hu R.J.hu W.h.hu x.h.hu Y.C.hu J.hua G.S.huang J.S.huang M.huang Q.Y.huang W.Q.huang x.T.huang x.J.huang Y.B.huang Y.S.huang N.hüsken V.Ivanov Q.P.Ji J.J.Jia S.Jia Z.K.Jia h.B.Jiang J.Jiang S.Z.Jiang J.B.Jiao Z.Jiao h.J.Jing x.L.Kang x.S.Kang B.C.Ke M.Kenzie A.Khoukaz I.Koop E.Kravchenko A.Kuzmin Y.Lei E.Levichev C.h.li C.li D.Y.li F.li G.li G.li h.B.li h.li h.N.li h.J.li h.L.li J.M.li J.li L.li L.li L.Y.li N.li P.R.li R.h.li S.li T.li W.J.li x.li x.h.li x.Q.li x.h.li Y.li Y.Y.li Z.J.li h.liang J.h.liang Y.T.liang G.R.liao L.Z.liao Y.liao C.x.lin D.x.lin x.S.lin B.J.liu C.W.liu D.liu F.liu G.M.liu h.B.liu J.liu J.J.liu J.B.liu K.liu K.Y.liu K.liu L.liu Q.liu S.B.liu T.liu x.liu Y.W.liu Y.liu Y.L.liu Z.Q.liu Z.Y.liu Z.W.liu I.Logashenko Y.Long C.G.Lu J.x.Lu N.Lu Q.F.Lü Y.Lu Y.Lu Z.Lu P.Lukin F.J.Luo T.Luo x.F.Luo Y.h.Luo h.J.Lyu x.R.Lyu J.P.Ma P.Ma Y.Ma Y.M.Ma F.Maas S.Malde D.Matvienko Z.x.Meng R.Mitchell A.Nefediev Y.Nefedov S.L.Olsen Q.Ouyang P.Pakhlov G.Pakhlova x.Pan Y.Pan E.Passemar Y.P.Pei h.P.Peng L.Peng x.Y.Peng x.J.Peng K.Peters S.Pivovarov E.Pyata B.B.Qi Y.Q.Qi W.B.Qian Y.Qian C.F.Qiao J.J.Qin J.J.Qin L.Q.Qin x.S.Qin T.L.Qiu J.Rademacker C.F.Redmer h.Y.Sang Anhui University Hefei 230039China Beihang University Beijing 100191China Budker Institute of Nuclear Physics Novosibirsk 630090Russia CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China Cavendish Laboratory University of CambridgeJJ Thomson AveCambridge CB30HEUnited Kingdom Central China Normal University Wuhan 430079China Central South University Changsha 410083China China University of Geosciences Wuhan 430074China China University of Mining and Technology Xuzhou 221116China École Polytechnique Fédérale de Lausanne(EPFL) LausanneSwitzerland Fudan University Shanghai 200433China Goethe University Frankfurt D-60325 Frankfurt am MainGermany Guangxi Normal University Guilin 541004China Guangxi Uninversity Nanning 530004China hangzhou Institute for Advanced Study UCASHangzhou 310024China hebei Normal University Shijiazhuang 050024China hebei University Baoding 071002China hefei University of Technology Hefei 230601China helmholtz Institute Mainz Staudinger Weg 18D-55099 MainzGermany henan Normal University Xinxiang 453007China henan University Kaifeng 475004China high Energy Physics Center Chung-Ang UniversitySeoul 06974Korea higher School of Economy 11 Pokrovsky Bulvar Moscow 109028Russia huangshan University Huangshan 245000China hubei University of Automotive Technology Shiyan 442002China hunan Normal University Changsha 410081China hunan University of Science and Technology Xiangtan 411201China hunan University Changsha 410082China Indiana University BloomingtonIndiana 47405USA Inner Mongolia University Hohhot 010021China Institute of Advanced Science Facilities Shenzhen 518107China Institute of high Energy Physics Chinese Academy of SciencesBeijing 100049China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Institute of Physics Academia SinicaTaipeiTaiwan 11529China Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100190China Jilin University Changch

The superτ-charm facility(STCF)is an electron–positron collider proposed by the Chinese particle physics *** is designed to operate in a center-of-mass energy range from 2 to 7 GeV with a peak luminosity of 0.5×10^(35) cm^(–2)·s^(–1) or *** STCF will produce a data sample about a factor of 100 larger than that of the presentτ-charm factory—the BEPCII,providing a unique platform for exploring the asymmetry of matter-antimatter(charge-parity violation),in-depth studies of the internal structure of hadrons and the nature of non-perturbative strong interactions,as well as searching for exotic hadrons and physics beyond the Standard *** STCF project in China is under development with an extensive R&D *** document presents the physics opportunities at the STCF,describes conceptual designs of the STCF detector system,and discusses future plans for detector R&D and physics case studies.

关键词： electron–positron collider tau-charm region high luminosity STCF detector conceptual design

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Amplitude analysis of the decays D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)

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Chinese Physics C 2024年第8期48卷 6-33页

作者： M.Ablikim M.N.Achasov P.Adlarson O.Afedulidis x.C.Ai R.Aliberti A.Amoroso Q.An Y.Bai O.Bakina I.Balossino Y.Ban h.-R.Bao V.Batozskaya K.Begzsuren N.Berger M.Berlowski M.Bertani D.Bettoni F.Bianchi E.Bianco A.Bortone I.Boyko R.A.Briere A.Brueggemann h.Cai x.Cai A.Calcaterra G.F.Cao N.Cao S.A.Cetin J.F.Chang W.L.Chang G.R.Che G.Chelkov C.Chen C.h.Chen Chao Chen G.Chen h.S.Chen M.L.Chen S.J.Chen S.L.Chen S.M.Chen T.Chen x.R.Chen x.T.Chen Y.B.Chen Y.Q.Chen Z.J.Chen Z.Y.Chen S.K.Choi x.Chu G.Cibinetto F.Cossio J.J.Cui h.L.Dai J.P.Dai A.Dbeyssi R.E.de Boer D.Dedovich C.Q.Deng Z.Y.Deng A.Denig I.Denysenko M.Destefanis F.De Mori B.Fang S.S.Fang W.x.Fang Y.Fang Y.Q.Fang R.Farinelli L.Fava F.Feldbauer G.Felici C.Q.Feng J.h.Feng Y.T.Feng K.Fischer M.Fritsch C.D.Fu J.L.Fu Y.W.Fu h.Gao Y.N.Gao Yang Gao S.Garbolino I.Garzia P.T.Ge Z.W.Ge C.Geng E.M.Gersabeck B.Ding x.x.Ding Y.Ding Y.Ding J.Dong L.Y.Dong M.Y.Dong x.Dong M.C.Du S.x.Du Z.h.Duan P.Egorov Y.h.Fan J.Fang JA.Gilman K.Goetzen L.Gong W.x.Gong W.Gradl S.Gramigna M.Greco M.h.Gu Y.T.Gu C.Y.Guan Z.L.Guan A.Q.Guo L.B.Guo M.J.Guo R.P.Guo Y.P.Guo A.Guskov J.Gutierrez K.L.han T.T.han x.Q.hao F.A.harris K.K.he K.L.he F.h.heinsius C.h.heinz Y.K.heng C.herold T.holtmann P.C.hong G.Y.hou x.T.hou Y.R.hou Z.L.hou B.Y.hu h.M.hu J.F.hu T.hu Y.hu G.S.huang K.x.huang L.Q.huang x.T.huang Y.P.huang T.hussain F.h\"olzken N.h\"usken N.in der Wiesche M.Irshad J.Jackson S.Janchiv J.h.Jeong Q.Ji Q.P.Ji W.Ji x.B.Ji x.L.Ji Y.Y.Ji x.Q.Jia Z.K.Jia D.Jiang h.B.Jiang P.C.Jiang S.S.Jiang T.J.Jiang x.S.Jiang Y.Jiang J.B.Jiao J.K.Jiao Z.Jiao S.Jin Y.Jin M.Q.Jing x.M.Jing T.Johansson S.Kabana N.Kalantar-Nayestanaki x.L.Kang x.S.Kang M.Kavatsyuk B.C.Ke V.Khachatryan A.Khoukaz R.Kiuchi O.B.Kolcu B.Kopf M.Kuessner x.Kui A.Kupsc W.K\"uhn J.J.Lane P.Larin L.Lavezzi T.T.Lei Z.h.Lei h.Leithoff M.Lellmann T.Lenz C.li C.li C.h.li Cheng li D.M.li F.li G.li h.li h.B.li h.J.li h.N.li hui li J.R.li J.S.li K.li L.J.li L.K.li Lei li M.h.li P.R.li Q.M.li Q.x.li R.li S.x.li T.li W.D.li W.G.li x.li x.h.li x.L.li x.Y.li Y Institute of high Energy Physics Chinese Academy of SciencesBeijing 100049China Beihang University Beijing 100191China Bochum Ruhr-University D-44780 BochumGermany Budker Institute of Nuclear Physics SB RAS(BINP) Novosibirsk 630090Russia Carnegie Mellon University PittsburghPennsylvania 15213USA Central China Normal University Wuhan 430079China Central South University Changsha 410083China China Center of Advanced Science and Technology Beijing 100190China China University of Geosciences Wuhan 430074China Chung-Ang University Seoul06974Republic of Korea COMSATS University Islamabad Lahore CampusDefence RoadOff Raiwind Road54000 LahorePakistan Fudan University Shanghai 200433China GSI helmholtzcentre for heavy Ion Research Gmbh D-64291 DarmstadtGermany Guangxi Normal University Guilin 541004China Guangxi University Nanning 530004China hangzhou Normal University Hangzhou 310036China hebei University Baoding 071002China helmholtz Institute Mainz Staudinger Weg 18D-55099 MainzGermany henan Normal University Xinxiang 453007China henan University Kaifeng 475004China henan University of Science and Technology Luoyang 471003China henan University of Technology Zhengzhou 450001China huangshan College Huangshan 245000China hunan Normal University Changsha 410081China hunan University Changsha 410082China Indian Institute of Technology Madras Chennai 600036India Indiana University BloomingtonIndiana 47405USA INFN Laboratori Nazionali di Frascati INFN Laboratori Nazionali di FrascatiI-00044FrascatiItaly INFN Laboratori Nazionali di Frascati INFN Sezione di PerugiaI-06100PerugiaItaly INFN Laboratori Nazionali di Frascati University of PerugiaI-06100PerugiaItaly INFN Sezione di Ferrara INFN Sezione di FerraraI-44122FerraraItaly INFN Sezione di Ferrara University of FerraraI-44122FerraraItaly Inner Mongolia University Hohhot 010021China Institute of Modern Physics Lanzhou 730000China Institute of Physics and Technology Peace Avenue 54BUlaanbaatar 13330Mongolia Instituto de A

Using e^(+)e^(−)annihilation data corresponding to an integrated luminosity of 2.93 fb^(−1)taken at the center-of-mass energy√s=3.773 GeV with the BESIII detector,a joint amplitude analysis is performed on the decays D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)(non-η).The fit fractions of individual components are obtained,and large interferences among the dominant components of the decays D^(0)→a_(1)(1260)π,D^(0)→π(1300)π,D^(0)→ρ(770)ρ(770),and D^(0)→2(ππ)_(S)are observed in both *** the obtained amplitude model,the CP-even fractions of D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)(non-η)are determined to be(75.2±1.1_(stat).±1.5_(syst.))%and(68.9±1.5_(stat).±2.4_(syst.))%,*** branching fractions of D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)(non-η)are measured to be(0.688±0.010_(stat.)±0.010_(syst.))%and(0.951±0.025_(stat.)±0.021_(syst.))%,*** amplitude analysis provides an important model for the binning strategy in measuring the strong phase parameters of D^(0)→4πwhen used to determine the CKM angleγ(ϕ_(3))via the B^(−)→DK^(−)decay.

关键词： BESIII D^(0)meson decays amplitude analysis CP-even fraction

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RhIC能区Au+Au碰撞中hBT关联参数分析(英文)

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高能物理与核物理 2001年第12期25卷 1253-1257页

作者：张景波霍雷张卫宁刘亦铭 x.h.li J.Yang N.xu 哈尔滨工业大学理论物理教研室哈尔滨150001 Nuclear Science Division

利用相对论量子分子动力学模型RQMD ,对RhIC能区s =2 0 0GeV/uAu +Au碰撞进行了 2π干涉学分析 ,并讨论了hBT半径参数对横动量的依赖关系 .研究表明 ,两粒子关联函数能够给出碰撞源在冻结时刻的时空拓扑信息 ,hBT半径参数能够较好地反... 详细信息

利用相对论量子分子动力学模型RQMD ,对RhIC能区s =2 0 0GeV/uAu +Au碰撞进行了 2π干涉学分析 ,并讨论了hBT半径参数对横动量的依赖关系 .研究表明 ,两粒子关联函数能够给出碰撞源在冻结时刻的时空拓扑信息 ,hBT半径参数能够较好地反映源的尺度和形状 ,但其对横动量的依赖关系并不能直接反映源的压缩性质 ,而是对粒子产生时源的空间

关键词：重离子碰撞 hBT关联关联函数相对论量子分子动力学模型 RQMD RhIC能区粒子

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相对论重离子碰撞中hBT关联 λ参数分析(英文)

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原子核物理评论 2001年第3期18卷 197-200页

作者：张景波霍雷张卫宁 x.h.li N.xu 刘亦铭哈尔滨工业大学理论物理教研室黑龙江哈尔滨150001 Nuclear Science Division Lawrence Berkeley National Laboratory

利用相对论量子分子动力学模型 RQMD,对 RhIC能区 s =2 0 0 AGe VAu+ Au中心碰撞进行了 2 π干涉学分析 ,对 hBT关联相干因子 λ的行为进行了研究 .研究表明 ,参数 λ一般小于理想混沌源时的值 ,这反映了源的部分相干特性外 ,还与源的... 详细信息

利用相对论量子分子动力学模型 RQMD,对 RhIC能区 s =2 0 0 AGe VAu+ Au中心碰撞进行了 2 π干涉学分析 ,对 hBT关联相干因子 λ的行为进行了研究 .研究表明 ,参数 λ一般小于理想混沌源时的值 ,这反映了源的部分相干特性外 ,还与源的膨胀和持续冻结有关 ,体现为

关键词：相对论重离子碰撞 hBT关联关联函数 RQMD λ参数冻结时间

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Fast efficient photon deceleration in plasmas by using two laser pulses at different frequencies

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Matter and Radiation at Extremes 2024年第3期9卷 11-18页

作者： Y.x.Wang x.L.Zhu S.M.Weng P.li x.F.li h.Ai h.R.Pan Z.M.Sheng Key Laboratory for Laser Plasmas(moe) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center of IFSA Shanghai Jiao Tong UniversityShanghai 200240China Research Center of Laser Fusion of China Academy of Engineering Physics MianyangSichuan 621900China State key Laboratory of high Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Tsung-dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China

The generation of ultrashort high-power light sources in the mid-infrared(mid-IR)to terahertz(Thz)range is of interest for applications in a number of fields,from fundamental research to biology and *** conventional laser technology,photon deceleration in plasma wakes provides an alternative approach to the generation of ultrashort mid-IR or Thz ***,we present a photon deceleration scheme for the efficient generation of ultrashort mid-IR or Thz pulses by using an intense driver laser pulse with a relatively short wavelength and a signal laser pulse with a relatively long *** signal pulse trails the driver pulse with an appropriate time delay such that it sits at the front of the second wake bubble that is driven by the driver *** to its relatively long wavelength,the signal pulse will be subjected to a large gradient of the refractive index in the plasma wake ***,the photon deceleration in the plasma wake becomes faster and more efficient for signal pulses with longer *** greatly enhances the capacity and efficiency of photon deceleration in the generation of ultrashort high-power light sources in the long-wavelength IR and Thz spectral ranges.

关键词： laser ultrashort photon

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Monazite and xenotime U-Th-Pb geochronology by ion microprobe:dating highly fractionated granites at xihuashan tungsten mine,SE China

Monazite and xenotime U-Th-Pb geochronology by ion microprob...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Q.L.li x.h.li Z.W.Lan C.L.Guo Y.N.Yang Y.liu G.Q.Tang State Key Laboratory of lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Institute of Mineral Resources Chinese Academy of Geological Sciences University of Chinese Academy of Sciences

Zircon,monazite,and xenotime have proven to be valuable chronometers for various geological processes due to their commonly high-U-Th and low common Pb ***,zircons that have crystallized in highly fractionated granites often have such high-U contents that radiation damage can lead to scattered U-Pb ages when measured with secondary ion mass spectrometry(SIMS). In this study,monazite and xenotime were separated from a number of highly fractionated granites at the xihuashan tungsten mine,Southeast China,for alternative dating methods by *** monazite analysis,obvious excess Pb signal(mainly from interference of ThNdO) was observed in high-Th(>2 wt%) monazite,which hinders Pb-based common Pb corrections. A Pb-based common Pb correction method was used *** employing power law relationships between Pb/U versus UO/U,Pb/Th versus ThO/Th and suitable exponentials,monazites with TI1O2 contents in the range of～3-19%do not exhibit this matrix *** SIMS U-Pb ages and Th-Pb ages of three phases of xihuashan granite samples were consistent with each other and yielded dates of 158.7±0.7,158.0±0.7,and 156.9±0.7 Ma,*** does show marked matrix effects due to variations of U,Th,and Y[or total rare earth element(REE),referred as ZREE hereafter]contents. Suitable correction factors require end-member standards with extremely high or low U,Th,and Y(or ZREE) contents. No excess Pb was observed,indicating that the Pb-based common Pb correction method is feasible. Independent Pb/Pb ages can be obtained,although multi-collector mode is necessary to improve *** main difficulties with dating xenotime are when high-Th (U) mineral inclusions are *** can identify when this occurs,however,by comparing the measured UO/U and ThO/Th with those in xenotime *** xenotime samples from the first phase of xihuashan granite yielded a weighted mean 207Pb/Pb date of 159.5±4.4 Ma(MSWD = 1.0) and a Pb/U date of 159.4±0.9 Ma(MSW

关键词： SIMS Monazite xenotime Zircon U-Pb dating highly fractionated granites

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中轴性脊柱关节炎:双能量虚拟去钙CT成像在检测骶髂关节骨髓水肿中的应用

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国际医学放射学杂志 2019年第2期42卷 231-232页

作者： h.J.Wu G.F.Zhang L.Shi x.h.li M.Chen x.Y.huang 李倩(译) 王玉婷(校) Department of Radiology Guangdong General HospitalGuangzhou 510080GuangdongChina 不详

目的探讨双能量虚拟去钙成像(VNCa)CT对中轴性脊柱关节炎相关骶髂关节炎病人骨髓水肿的诊断价值。材料与方法这项前瞻性研究连续收集2016年4月—2017年12月期间47例受试者[年龄14~41岁,平均27岁(男28例,年龄14~37岁,平均24岁;女19例,年... 详细信息

目的探讨双能量虚拟去钙成像(VNCa)CT对中轴性脊柱关节炎相关骶髂关节炎病人骨髓水肿的诊断价值。材料与方法这项前瞻性研究连续收集2016年4月—2017年12月期间47例受试者[年龄14~41岁,平均27岁(男28例,年龄14~37岁,平均24岁;女19例,年龄17~41岁,平均29岁)],行双能CT和3.0 T MRI检查。

关键词：脊柱关节炎骨髓水肿骶髂关节双能量 CT

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Microstructure evolution and shape memory behaviors of Ni_(47)Ti_(44)Nb_(9)alloy subjected to multistep thermomechanical loading with different prestrain levels

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Journal of Materials Science & Technology 2024年第4期171卷 80-93页

作者： Y.h.Zhang h.li Z.W.Yang x.liu Q.F.Gu State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of high-Performance Precision Forming Technology and Equipment Northwestern Polytechnical UniversityXi’an 710072China

Ni_(47)Ti_(44)Nb_(9)shape memory alloy(SMA)is a promising material in the aerospace field due to its wide transformation *** application of shape memory effect depends on multistep thermomechan-ical loading,viz.,low-temperature deformation and subsequent heating to ***-temperature deformation prestrain plays a pivotal role in shape memory properties tailoring of SMA ***,microstructure evolution and deformation mechanisms of Ni_(47)Ti_(44)Nb_(9)SMA subjected to vari-ous prestrain levels are still *** this end,microstructure evolution and shape memory behaviors of Ni_(47)Ti_(44)Nb_(9)alloy subjected to multistep thermomechanical loading with prestrain levels of 8%-16%at-28℃(M_(s)+30℃)were *** results demonstrate that the stress-strain curve of the specimen exhibits four distinct stages at a maximal prestrain of 16%.Whereas stageⅡand stageⅢend at prestrains of∼8%and∼12%,*** stageⅡ,the stress-induced martensitic transformation is accompanied by the dislocation slip of the NiTi matrix andβ-Nb *** stageⅢ,in addition to the higher density of dislocations and further growth of stress-induced martensite variants(SIMVs),(001)compound twins are introduced as a result of the(001)deformation twinning in stress-induced ***{20-1}martensite twins are gradually introduced in stageⅣ.Correspondingly,after subsequent unloading and heating,a higher density of{114}austenite twins form in the specimen with a larger prestrain of 16%.With increasing prestrain from 8%to 16%,the recoverable strainε_(re)^(T)upon heating increases first and then ***ε_(re)^(T)obtains a maximum of 7.03%at 10%prestrain and de-creases to 6.17%at 16%*** increase ofε_(re)^(T)can be attributed to the formation of new SIMVs,the further growth of existing SIMVs,and the recoverable(001)compound *** the decrease ofε_(re)^(T)is mainly associated with the irrecoverable strain by{20−1}martensite *** effe

关键词： Ni_(47)Ti_(44)Nb_(9)shape memory alloy Wide transformation hysteresis Thermomechanical loading Microstructure evolution Shape memory behaviors Stress-induced martensitic transformation Deformation twinning

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Very high-K KREEP-rich clasts in the impact melt breccia of the lunar meteorite SaU 169:New constraints on the last residue of the Lunar Masma Ocean

Very high-K KREEP-rich clasts in the impact melt breccia of ...

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中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： Y.lin W.Shen Y.liu L.xu B.A.hofmann Q.Mao G.Q.Tang F.Wu x.h.li Key Laboratory of the Earth's Deep Interior Institute of Geology and GeophysicsChinese Academy of Sciences State Key Laboratory of lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences National Astronomical Observatories Chinese Academy of Sciences

In the impact melt breccia(IMB) of Sayh al Uhaymir(SaU) 169,the most KREEP-rich lunar meteorite to date(Gnos et al.,2004),clasts of a new type of lithologies were discovered,consisting of Ca-poor and Ca-rich pyroxenes(60.8 vol.%), Ba-rich K-feldspar(27.9 vol.%),phosphates(5.6 vol.%),Nb-rich ilmenite(4.0 vol.%),zircon(1.2 vol.%) and minor sulfide (0.6 vol.%).These mafic lithic clasts are more enriched in KREEP component(～1500×CI) than the host meteorite and are highly enriched in *** are referred to as very high-K(VhK) KREEP lithology,and probably most close to the last residual liquid of the Lunar Magma Ocean without significant dilution by other Mg-rich *** fine-grained matrix of the SaU 169 IMB has very similar mineral chemistry to the VhK KREEP lithology,but contains abundant plagioclase with trace *** matrix shows decoupling of K from the REEP-like component;however,it cannot be simply interpreted by mixing the VhK KREEP lithology with anorthosites,which should have diluted the REEP-like component with the same proportion. STMS Pb-Pb dating was conducted on zircons in various petrographic settings and with different crystal *** analyses show a main age peak at 3921±3 Ma and a smaller one at 4016±6 *** main age peak is identical to the previous Pb-Pb age by Gnos et al.(2006) and U-Pb age by liu el al.(2009),dating the catastrophic shock event contributed to the formation of SaU 169 *** older ages are consistent with the previous report of an older bulk U-Pb age by Kramers et al.(2007),suggestive of presence of relict crystals in a few large zircon *** VhK KREEP clasts predated the finegrained matrix,but have the same zircon Pb-Pb ages as the latter within the analytical *** was converted to maskelynite whereas zircon was shocked to diaplectic glass,probably by a second event at～2.8 ***, the identical zircon Pb-Pb ages of the amorphous parts and the remained crystalline areas indicate n

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Cambrian to early Silurian ophiolite and accretionary processes in the Beishan collage,NW China:implications for the architecture of the Southern Altaids

Cambrian to early Silurian ophiolite and accretionary proces...

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中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： S.J.AO W.J.xIAO C.M.hAN x.h.li J.F.QU J.E.ZhANG Q.Q.GUO Z.h.TIAN Stale Key Laboratory of lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences State Key Laboratory of lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Institute of Geology Chinese Academy of Geological Sciences

The mechanism of continental growth of the Altaids is currently under debate between models invoking continuous subduction-accretion or punctuated accretion by closure of multiple ocean *** use the Yueyashan-xichangjing ophiolite belt of the Beishan collage(southern Altaids) to constrain the earliest oceanic crust in the southern Palaeo-Asian *** lithotectonic units were identified from S to N:the huaniushan block,a sedimentary passive margin,the structurally incoherent Yueyashan-xichangjing ophiolite complex,a coherent sedimentary package and the Mazongshan island arc with granitic *** present a structural analysis of the accretionary complex,which is composed of the incoherent ophiolitic melange and coherent sedimentary rocks,to work out the tectonic polarity.A new weighted mean pb-U age of 533±1.7 Ma from a plagiogranite in the Yueyashan-xichangjing ophiolite indicates that the ocean floor formed in early Cambrian time. Furthermore,we present new geochemical data to constrain the tectonic setting of the Yueyashanxichangjing *** Yueyashan-xichangjing ophiolite was emplaced as a result of northward subduction of an oceanic plate beneath the Mazongshan island arc to the north in late Ordovician to early Silurian *** with data from the literature,our work demonstrates that multiple overlapping periods of accretion existed in the Palaeozoic in the northern and southern ***,a model of multiple accretion by closure of several ocean basins is most viable.

关键词： Beishan Yueyashan-xichangjing ophiolite accretionary complex Altaids.

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