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Grenvillian and early Paleozoic polyphase metamorphism recorded by eclogite and host garnet mica schist in the North Qaidam orogenic belt

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Geoscience Frontiers 2021年第4期12卷 244-259页

作者： yunfei ren Danling Chen Haijie Wang Xiaohui Zhu Bowen Bai State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi'an 710069China Xi'an Center of Geological Survey China Geological SurveyXi'an 710054China

The North Qaidam orogenic belt(NQOB) is generally considered to be an early Paleozoic ultrahigh pressure metamorphic belt,but increasing reports of the Neoproterozoic magmatic and metamorphic events indicate that the NQOB probably also experienced the assembly of the ***,the Neoproterozoic evolution of the NQOB is not well constrained due to the sparse records and ambiguous nature of the Neoproterozoic *** order to reveal the multi-orogenic history of the NQOB,an integrated study of petrology,phase equilibrium modelling and geochronology was conducted on an epidote eclogite and host garnet mica schist from the Yuka–Luofengpo *** zircon and monazite U–Pb ages show that the protolith of the garnet mica schist was deposited during 994–920 Ma and experienced Neoproterozoic(920–915 Ma) and early Paleozoic(451–447 Ma) polyphase metamorphism together with the enclosed *** omphacite inclusions were first identified in garnet and early Paleozoic zircon domains from the garnet mica schist,which provide solid evidence for the early Paleozoic eclogite facies metamorphism of the mica *** early Paleozoic peak P–T conditions of >27.4 kbar/613–670 ℃ and 30.2–30.8 kbar/646–655 ℃ were obtained for the garnet mica schist and enclosed eclogite,respectively,indicating that eclogites and their host paragneisses in this region underwent continental deep subduction as a coherent metamorphic terrane in early *** peak P–T conditions of the Neoproterozoic metamorphism were roughly constrained at 7.7–12.0 kbar and 634–680 ℃ for the garnet mica schist,based on stability field of mineral inclusions in Neoproterozoic zircons domains in P–T pseudosection,the relic garnet core composition and Ti-in-zircon *** high thermal gradients(16–37 ℃/km) defined by presently our and previously reported P–T conditions indicate that the Neoproterozoic metamorphism likely occurred in continental collision setting at >945–890 *** the

关键词： Grenvillian metamorphism Two orogenic cycles Pseudosection North Qaidam Rodinia

北秦岭造山带西段早古生代榴辉岩相变质岩石的发现及其地质意义

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岩石学报 2022年第3期38卷 585-597,I0001页

作者：唐源陈丹玲任云飞王海杰西北大学大陆动力学国家重点实验室西北大学地质学系西安710069

西秦岭地处中国中央造山系东西转换衔接部位,随着东秦岭以及祁连、柴北缘和东昆仑早古生代高压-超高压变质岩石的陆续发现和深入研究,西秦岭造山带变质作用研究吸引了大家的普遍关注。本文在大范围野外地质调查基础上,在北秦岭造山带西... 详细信息

西秦岭地处中国中央造山系东西转换衔接部位,随着东秦岭以及祁连、柴北缘和东昆仑早古生代高压-超高压变质岩石的陆续发现和深入研究,西秦岭造山带变质作用研究吸引了大家的普遍关注。本文在大范围野外地质调查基础上,在北秦岭造山带西段天水南部的秦岭岩群长英质片麻岩中发现了一套石榴子石斜长角闪岩(榴闪岩),并开展了详细的锆石形貌和内部结构、微区微量元素和U-Th-Pb同位素研究。CL图像显示榴闪岩锆石普遍具有核-幔-边或核-边结构,部分存在原岩残留锆石。定年结果得到榴闪岩原岩残留锆石年龄为710±52Ma,同时得到497±3Ma、452±3Ma和423±7Ma三期变质年龄。其中497±3Ma变质年龄来自锆石核部并显示出轻稀土亏损、重稀土平坦且没有明显负Eu异常的稀土配分曲线特征,表明该时期的矿物组合中有石榴子石但没有斜长石,与榴辉岩相变质锆石特征一致;452±3Ma变质年龄来自锆石幔部或边部,对应测点重稀土元素的分异加大,并出现弱的负Eu异常,说明此时石榴子石被消耗且出现少量斜长石;423±7Ma变质年龄来自锆石的最边部,对应稀土配分曲线表现出更明显的负Eu异常和更大的重稀土元素分异特征,指示此时岩石中石榴子石含量更少,斜长石含量更多。上述结果表明该榴闪岩可能经历了~500Ma的榴辉岩相变质作用,并在~450Ma和~420Ma叠加了两期退变质改造。天水地区榴闪岩无论是其野外产状,还是变质锆石的形貌和内部结构、稀土配分曲线特征及其所记录的原岩和三期变质年龄都与北秦岭造山带东段大陆俯冲型高压-超高压变质榴辉岩近乎一致,指示早古生代时期,北秦岭造山带西段与东段经历了相似的大陆(深)俯冲和折返过程,它们共同构成一条统一的早古生代高压-超高压变质岩带。

关键词：北秦岭造山带西段秦岭岩群榴辉岩相变质作用锆石U-Pb定年

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祁连山地区花岗质岩浆作用及构造演化

地学前缘 2022年第2期29卷 241-260页

作者：朱小辉陈丹玲冯益民任云飞张欣中国地质调查局西安地质调查中心造山带地质研究中心陕西西安710054 西北大学地质学系大陆动力学国家重点实验室陕西西安710069

祁连山在构造上是一条经历了多期构造旋回叠加的早古生代复合型造山带,花岗质岩浆作用研究对揭示其构造演化具有重要意义。锆石U-Pb年代学统计结果表明,祁连地区花岗质岩浆活动可以分为7个大的阶段,包括古元古代早期(2470~2348 Ma)、古... 详细信息

祁连山在构造上是一条经历了多期构造旋回叠加的早古生代复合型造山带,花岗质岩浆作用研究对揭示其构造演化具有重要意义。锆石U-Pb年代学统计结果表明,祁连地区花岗质岩浆活动可以分为7个大的阶段,包括古元古代早期(2470~2348 Ma)、古元古代晚期(1778~1763 Ma)、中元古代晚期-新元古代早期(1192~888 Ma)、新元古代中期(853~736 Ma)、中寒武世-志留纪(516~419 Ma),泥盆纪-早石炭世(418~350 Ma)以及中二叠世-晚三叠世(271~211 Ma)。其中古元古代早期发育强过铝质高钾钙碱性S型和准铝质低钾拉斑高钾钙碱性I型花岗岩,记录了早期的陆壳增生及改造事件。古元古代晚期为准铝质弱过铝质高钾钙碱性钾玄质A型花岗岩,是Columbia超大陆裂解事件的产物。中元古代晚期-新元古代早期以过铝质-强过铝质钙碱性-钾玄质S型花岗岩为主,新元古代中期以准铝质-强过铝质钙碱性-高钾钙碱性A型花岗岩为主,分别对应Rodinia超大陆的汇聚和裂解事件。中寒武世-志留纪花岗岩是洋陆转换过程中的产物,约440 Ma加厚基性下地壳部分熔融形成的低Mg埃达克岩的广泛出现指示祁连地区全面进入碰撞造山阶段。泥盆纪-早石炭世花岗岩代表后碰撞伸展阶段岩浆岩组合,发育准铝质强过铝质低钾拉斑钾玄质等一系列花岗岩。中二叠世-晚三叠世花岗岩以准铝质弱过铝质钙碱性高钾钙碱性I型花岗岩为主,有少量弱过铝质高钾钙碱性A型花岗岩,是宗务隆洋俯冲消减以及碰撞后伸展过程的产物。

关键词：年代学岩石地球化学时空分布花岗岩祁连山

Large-Area Gravure-Printed AgNWs Electrode on Water/Oxygen Barrier Substrate for Long-Term Stable Large-Area Flexible Organic Solar Cells

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Chinese Journal of Chemistry 2024年第5期42卷 478-484页

作者： Hao Wang Yaqin Pan yunfei Han Zhuo Chen Tianyu Liu Lianping Zhang Qun Luo Chang-Qi Ma Printable Electronics Research Center & i-Lab Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of Sciences (CAS)SuzhouJiangsu215123 China Nano Science and Technology Institute University of Science and Technology of China166 Ren Ai RoadSEID SIPSuzhouJiangsu215123 China

Large-area AgNWs electrodes(25 cm×10 cm)were fabricated through roll-to-roll printing on the polyvinyl alcohol(PVA)modified water and oxygen barrier *** modification of the barrier film with PVA improved the wettability of silver nanowires on the barrier films and led to the formation of homogenous large-area AgNWs *** mechanical flexibility,especially the adhesion force between the silver electrode and the barrier film substrate was dramatically improved through PVA *** efficiency of 13.51%for the flexible OSCs with an area of 0.64 cm2 was achieved based on the PET/barrier film/PVA/AgNWs *** long-term stability showed the flexible OSCs based on the PET/barrier film/PVA/AgNWs electrode have a significantly improved stability relative to the device on PET/AgNWs electrode,and comparable air stability as the rigid device with glass/ITO *** unencapsulated devices maintained nearly 50%of the original efficiency after storage for 600 h in *** a simple top encapsulation,the flexible devices remained at 60%of the initial efficiency after 2000 h in the ***,the flexible AgNWs electrode based on the barrier film would have the potential to improve the air storage stability of organic flexible solar cells.

关键词： Flexible organic solar cell AgNWs electrode Air storage stability Barrier films substrate Energy conversion Flexible electronics Interface

铝合金三角形波纹夹芯板抗平头弹冲击的损伤特性研究

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振动与冲击 2024年第3期43卷 179-188页

作者：任光辉赵鑫邓云飞杨笑岳中国民航大学国资处天津300300 中国民航大学航空工程学院天津300300

为研究铝合金三角形波纹夹芯板受到平头弹冲击后的损伤形式与抗冲击性能,利用一级气炮对铝合金三角形波纹夹芯板的两种冲击位置进行冲击试验。根据试验数据,对比分析三角形波纹夹芯板及等面密度单层板的弹道极限速度与耗能,并结合有限... 详细信息

为研究铝合金三角形波纹夹芯板受到平头弹冲击后的损伤形式与抗冲击性能,利用一级气炮对铝合金三角形波纹夹芯板的两种冲击位置进行冲击试验。根据试验数据,对比分析三角形波纹夹芯板及等面密度单层板的弹道极限速度与耗能,并结合有限元仿真分析夹芯板的动态损伤过程、动态载荷响应及损伤机理。研究结果表明,三角形波纹夹芯板损伤形式为剪切破坏、撕裂破坏与弯曲变形。波纹板的抗冲击性能低于等面密度的单层板,并且波纹板节点位置的抗冲击性能高于基座位置。当弹体冲击速度较低时,波纹板的耗能低于单层板,随着冲击速度增加,波纹板节点位置的耗能高于单层板,基座位置的耗能与单层板相近。此外,波纹板的动态载荷响应与失效机理均受到冲击位置与弹体冲击速度的影响。

关键词：波纹夹芯板失效模式弹道极限速度冲击

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热挤压钛/钢复合管的微观组织和性能

材料研究学报 2023年第9期37卷 713-720页

作者：潘新元蒋津任云飞刘莉李景辉张明亚安徽工业大学冶金工程学院马鞍山243002

以低碳钢Q235为内管、以工业纯钛TA2为复管,用热挤压工艺制备了钛/钢复合管,使用金相显微镜、场发射扫描电子显微镜、X射线衍射仪、显微硬度仪和纳米压痕等手段对其表征,研究了这种钛/钢复合管的力学性能与结合界面微观组织的关系。结... 详细信息

以低碳钢Q235为内管、以工业纯钛TA2为复管,用热挤压工艺制备了钛/钢复合管,使用金相显微镜、场发射扫描电子显微镜、X射线衍射仪、显微硬度仪和纳米压痕等手段对其表征,研究了这种钛/钢复合管的力学性能与结合界面微观组织的关系。结果表明,钛/钢复合管的外径为22 mm,内外壁厚分别为2.8 mm和0.4 mm,复合界面结合良好,界面内的主要物相为α-Fe、α-Ti、TiC及Fe_(2)Ti;高温挤压使钛/钢复合管结合界面处的位错密度提高和晶粒明显细化,复合管钛侧的晶粒细化程度比基材钢侧的高,界面晶粒的平均尺寸为1.5μm。加工硬化和高温热挤压使钛/钢结合界面的硬度提高,界面结合处的硬度最大。低温退火削弱了钛/钢复合管的加工硬化程度,提高了界面材料的刚度,而对界面金属间化合物生成的反应层的影响较小。

关键词：复合材料热挤压钛/钢复合管显微组织力学性能

Early Paleozoic Ocean in the North Qaidam: Constraints from Kaipinggou Ophiolite

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Acta Geologica Sinica(English Edition) 2020年第S1期94卷 6-6页

作者： CHEN Danling ZHU Xiaohui ren yunfei TUO Yu State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi'an710069China

The North Qaidam orogenic belt(NQOB) lies at the northeast margin of Tibet Plateau, between the Qilian massif to the north and Qaidam massif to the south. It consists of predominantly gneisses and marbles with minor eclogite and garnet peridotite, and is known as an Early Paleozoic continental deep subduction ultrahigh pressure(UHP) metamorphic belt in northwest China. Recently some studies suggest that the NQOB experienced oceanic deep subduction prior to the continental deep subduction. However, the records of ocean events are rarely preserved because of the complex multi-stage ***, whether the Early Paleozoic ocean exists and the formation, nature and evolution of the Early Paleozoic ocean in North Qaidam are still in controversies. In this contribution, we report a new discovered SSZ-type ophiolite suite in Kaipinggou area, the western segment of the NQOB. The ophiolite is mainly composed of peridotite, gabbro,basalt, boninite, andesitic porphyrite and plagiogranite. In which,the basalt and homogeneous gabbro are both enriched in LILE and depleted in HFSE, and display flat or LREE-depleted REE patterns, similar to the MORB-like geochemical characteristics of fore-arc basalts;the boninite exhibits characteristics of forearc boninites with high Si and Mg, but low Ti and Ca contents;the andesitic porphyrite is enriched in LILE but depleted in HFSE, similar to island arc magmatic rocks. Rock assemblage and their geochemical characteristics suggest that this SSZ-type ophiolite was formed in fore-arc setting of intra-oceanic arc. The plagiogranite is a low-potassium tholeiite metaluminous granite with low trace elements contents, slight enrichment of LREE,depletion of HREE and positive Eu anomaly;combining with εHf(t) values(13.8–17.1) of zircons, the plagiogranite could be originated from partial melting of gabbros. LA–ICP–MS zircon U–Pb dating yielded the crystallization ages of 535±2 Ma, 513±3 Ma and 510±3 Ma for two cumulate gabbros and one ho

关键词： SSZ-type ophiolite suite geochemistry zircon U-Pb dating the North Qaidam

秦岭岩群东段马山口岩体年代学及岩石地球化学:对北秦岭新元古代早期构造演化的指示

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地质学报 2022年第6期96卷 2001-2020页

作者：宫相宽陈丹玲任云飞罗芬红谭俊木热地力·买合苏提李阔新疆中亚造山带大陆动力学与成矿预测自治区重点实验室新疆大学地质与矿业工程学院新疆乌鲁木齐830046 西北大学大陆动力学国家重点实验室西北大学地质学系陕西西安710069

河南西峡地区马山口岩体出露于北秦岭构造带秦岭岩群东段,岩石类型为片麻状花岗闪长岩。LA-ICP-MS锆石U-Pb定年结果表明,该岩体形成时代为929±7 Ma,是新元古代早期花岗质岩浆活动的产物。岩石的SiO_(2)和Al_(2)O_(3)含量分别为65.52%~6... 详细信息

河南西峡地区马山口岩体出露于北秦岭构造带秦岭岩群东段,岩石类型为片麻状花岗闪长岩。LA-ICP-MS锆石U-Pb定年结果表明,该岩体形成时代为929±7 Ma,是新元古代早期花岗质岩浆活动的产物。岩石的SiO_(2)和Al_(2)O_(3)含量分别为65.52%~66.91%和14.63%~15.41%,Na_(2)O和K_(2)O含量较高,分别为2.82%~3.08%和2.14%~3.10%,Na_(2)O/K_(2)O比值主体>1,富TFe_(2)O_(3)(5.99%~7.03%),高CaO(2.78%~3.72%)和MgO(1.35%~1.87%),Mg^(#)值介于34.4~38.3之间,A/CNK值为1.07~1.14,属于过铝质钙碱性—高钾钙碱性岩石,显示I型花岗岩特征。岩石的Nb/Ta、Rb/Y和Nb/Y比值反映壳源岩石特征,低Sr(102×10^(-6)~175×10^(-6)),高Yb(2.13×10^(-6)~3.67×10^(-6))和Y(27.0×10^(-6)~38.6×10^(-6)),可能是下地壳(变)基性岩石部分熔融的产物。岩石稀土总量中等(∑REE=180×10^(-6)~229×10^(-6)),相对富集轻稀土和大离子亲石元素Rb、Ba、Th等,亏损高场强元素Nb、Ta和Ti,具有火山弧花岗岩地球化学特征,形成于新元古代早期洋壳俯冲背景下的陆缘弧环境。

关键词：秦岭岩群新元古代花岗岩锆石U-Pb年代学岩石地球化学陆缘弧

马氏体时效钢激光选区熔化成形过程介观尺度数值模拟

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机械工程学报 2024年第3期60卷 282-295页

作者：宋军唐倩罗智超冯琪翔聂云飞任治好重庆大学机械与运载工程学院重庆400044 华中科技大学材料成形与模具技术全国重点实验室武汉430074 重庆邮电大学先进制造工程学院重庆400065

激光选区熔化(Selective laser melting,SLM)成形过程涉及多种发生于介观尺度下的物理现象,采用试验方法难以揭示物理现象复杂的形成规律。以18Ni-300马氏体时效钢为SLM成形材料,采用离散元法与有限体积法建立了SLM成形介观尺度热流耦... 详细信息

激光选区熔化(Selective laser melting,SLM)成形过程涉及多种发生于介观尺度下的物理现象,采用试验方法难以揭示物理现象复杂的形成规律。以18Ni-300马氏体时效钢为SLM成形材料,采用离散元法与有限体积法建立了SLM成形介观尺度热流耦合数值模型,并结合熔道成形试验验证模型的正确性。结合数值模拟揭示激光功率从60 W增加至270 W时单道SLM成形熔道形貌、熔池尺寸与温度、传热机制等熔池行为的基本特征;研究在0.2 J/mm、0.3 J/mm和0.45 J/mm线能量密度下不同激光功率和扫描速度组合对熔道形貌、熔池尺寸与传热机制的影响规律;结合熔道搭接理论模型计算激光功率180 W和扫描速度600 mm/s组合下无搭接缺陷的扫描间距理论临界条件约为83μm,并研究80μm、100μm和120μm扫描间距下多道多层SLM成形熔道搭接行为和演变规律。该模型可用于筛选工艺参数区间,提高工艺优化效率,为单层/多层成形的工艺试验提供指导。

关键词：激光选区熔化马氏体时效钢数值模拟熔池缺陷