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Petrology, geochemistry and Ar-Ar geochronology of eclogites in Jinshajiang orogenic belt, Gonjo area, eastern Tibet and restriction on Paleo-Tethyan evolution

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China Geology 2023年第2期6卷 285-302页

作者： Yuan Tang ya-dong qin Xiao-dong Gong Yong Li dong-bing Wang Bao-di Wang Chengdu Center China Geological Survey(Geosciences Innovation Center of Southwest China)Ministry of Natural ResourcesChengdu 610081China China Aero Geophysical Survey and Remote Sensing Center for Natural Resources Beijing 100083China

As one of the important Paleo-Tethys suture zones in eastern Tibet,the Jinshajiang orogenic belt is of great significance to study the tectonic evolution of the main suture zone of *** this paper,eclogites developed in the Jinshajiang suture zone in Gonjo area,eastern Tibet,are selected as specific research objects,and petrological,geochemical and Ar-Ar geochronological analyses are carried *** major element data of the whole rock reveals that the eclogite samples have the characteristics of picritic basalt-basalt and belong to the oceanic low potassium *** results of rare earth elements and trace elements of the samples show that the protoliths of eclogites have characteristics similar to oceanic island basalt(OIB)or normal mid ocean ridge basalt(N-MORB).Muscovite(phengite)from two eclogite samples yield the Ar-Ar plateau ages of 247±2 Ma and 248±2 Ma respectively,representing the peak metamorphic age of eclogite facies and the timing of complete closure of the Jinshajiang Paleo-Tethys *** and biotite selected from the hosting rocks of eclogite yield the Ar-Ar plateau ages are 238±2 Ma and 225±2 Ma respectively,reflecting the exhumation age of eclogites and their hosting *** with the zircon U-Pb dating data(244 Ma)of eclogites obtained in previous work,it can be concluded that the Jinshajiang Paleo-Tethys ocean was completely closed and arc-continent collision was initiated at about 248-244 Ma(T21).Subsequently,due to the large-scale arc(continent)-collision orogeney between Deqin-Weixi continental margin arc and Zhongza block(T31-T32),the eclogites were rapidly uplifted to the shallow crust.

关键词： Eclogite Ar-Ar geochronology Closure of Paleo-Tethys ocean Arc-continent collision Geological survey engineering Jinshajiang orogenic belt Eastern Tibet

Landslide distribution and sliding mode control along the Anninghe fault zone at the eastern edge of the Tibetan Plateau

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Journal of Mountain Science 2021年第8期18卷 2094-2107页

作者： ZHOU Hong-fu LIU Bin YE Fei FU Wen-xi TANG Wen-qing qin ya-dong FANG Tian Chengdu Center China Geological SurveyChengdu610081China Sichuan Geological Survey Chengdu610081China State Key Laboratory of Hydraulics and Mountain Rivers Protection Sichuan UniversityChengdu610065China College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao266590China

Tibetan Plateau is known as the roof of the *** to the continuous uplift of the Tibetan Plateau,many active fault zones are *** active fault zones such as the Anninghe fault zone have a significant influence on the formation of special geomorphology and the distribution of geological hazards at the eastern edge of the Tibetan *** Anninghe fault zone is a key part of the Y-shaped fault pattern in the Sichuan-Yunnan block of *** this paper,high-resolution topographic data,multitemporal remote sensing images,numerical calculations,seismic records,and comprehensive field investigations were employed to study the landslide distribution along the active part of the *** influence of active faults on the lithology,rock mass structures and slope stress fields were also *** results show that the faults within the Anninghe fault zone have damaged the structure and integrity of the slope rock mass,reduced the mechanical strength of the rock mass and controlled the slope failure *** faults have also controlled the stress field,the distribution of the plastic strain zone and the maximum shear strain zone of the slope,thus have promoted the formation and evolution of *** find that the studied landslides are linearly distributed along the Anninghe fault zone,and more than 80%of these landslides are within 2–3 km of the fault rupture ***,the Anninghe fault zone provides abundant substance for landslides or debris *** paper presents four types of sliding mode control of the Anninghe fault zone,e.g.,constituting the whole landslide body,controlling the lateral boundary of the landslide,controlling the crown of the landslide,and constituting the toe of the *** results presented merit close attention as a valuable reference source for local infrastructure planning and engineering projects.

关键词： Tibetan Plateau Anninghe fault zone Landslide distribution Sliding mode control

A new understanding of Demala Group complex in Chayu Area, southeastern qinghai- Tibet Plateau: Evidence from zircon U-Pb and mica ^(40)Ar/^(39)Ar dating

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China Geology 2021年第1期4卷 77-94页

作者： Yuan Tang Yu-ping Liu Peng Wang Wen-qing Tang ya-dong qin Xiao-dong Gong dong-bing Wang Bao-di Wang Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China Chengdu Center China Geological SurveyChengdu 610081China

The Chayu area is located at the southeastern margin of the qinghai-Tibet *** region was considered to be in the southeastward extension of the Lhasa Block,bounded by Nujiang suture zone in the north and yarlung Zangbo suture zone in the *** Demala Group complex,a set of high-grade metamorphic gneisses widely distributed in the Chayu area,is known as the Precambrian metamorphic basement of the Lhasa Block in the *** to field-based investigations and microstructure analysis,the Demala Group complex is considered to mainly consist of banded biotite plagiogneisses,biotite quartzofeldspathic gneiss,granitic gneiss,amphibolite,mica schist,and quartz schist,with many leucogranite *** zircon U-Pb ages of two granitic gneiss samples are 205±1 Ma and 218±1 Ma,respectively,representing the ages of their *** zircons from two biotite plagiogneisses samples show core-rim *** U-Pb ages of the cores are mainly 644–446 Ma,1213–865 Ma,and 1780–1400 Ma,reflecting the age characteristics of clastic zircons during sedimentation of the original *** U-Pb ages of the rims are from 203±2 Ma to 190±1 Ma,which represent the age of *** zircon U-Pb ages of one sample taken from the leucogranite veins that cut through granitic gneiss foliation range from 24 Ma to 22 Ma,interpreted as the age of the anatexis in the Demala Group *** and muscovite separates were selected from the granitic gneiss,banded gneiss,and leucogranite veins for 40Ar/39Ar *** plateau ages of three muscovite samples are 16.56±0.21 Ma,16.90±0.21 Ma,and 23.40±0.31 Ma,and the plateau ages of four biotite samples are 16.70±0.24 Ma,16.14±0.19 Ma,15.88±0.20 Ma,and 14.39±0.20 *** mica Ar-Ar ages can reveal the exhumation and cooling history of the Demala Group *** with the previous research results of the Demala Group complex,the authors refer that the Demala Group complex should be a set of metamorphic *** complex in

关键词： Demala Group complex Zircon U-Pb dating 40Ar/39Ar dating Jiali fault zone Geological survey engineering Tibet-qinghai Plateau China

Discovery of eclogites in Jinsha River suture zone, Gonjo County, eastern Tibet and its restriction on Paleo-Tethyan evolution

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China Geology 2020年第1期3卷 83-103页

作者： Yuan Tang ya-dong qin Xiao-dong Gong yao-yao Duan Gang Chen Hong-you yao Jun-xiong Liao Shi-yong Liao dong-bing Wang Bao-di Wang Chengdu Center China Geological SurveyMinistry of Natural ResourcesChengdu 610081China Northwest Sichuan Geological Team Sichuan Bureau of Geology and Mineral ExplorationMianyang 621000China No.108 Geological Team Sichuan Bureau of Geology and Mineral ExplorationChengdu 611230China Purple Mountain Observatory Chinese Academy of SciencesNanjing 210008China

As the important component of the eastern Tethys tectonic region,the Jinsha River-Ailao Mountain suture zone is often considered to be an ophiolitic mé1ange ***,the P-T-t path and chronological framework of the metamorphic evolution in the collisional orogenetic process of this zone are still poorly understood owing to the lack of metamorphism research of symbolic high-pressure *** a regional geological survey on a scale of 1:50000 in Gonjo County,Tibet Autonomous Region involved in this paper,(retrograde)eclogites lenses of different scales were found in Jinsha River suture zone,eastern Tibet for the first ***(retrograde)eclogites can be divided into garnet-albite-chlorite-actinolite schists and eclogites according to retrograde *** mainly mineral components of eclogites include garnet(45%-50%),clinopyroxene(about 25%),and hornblende(5%-10%)primarily,and biotite,quartz,rutile,and muscovite *** to the data of electron probe micro analysis(EPMA),clinopyroxenes feature high content of Na2O(5.6%-6%)and corresponding jadeite(Jd)molecules of 37%-44%,and they fall within the omphacite region in Quad-Jd-Ae *** temperature and pressure of the metamorphism at peak are P≈2.2-2.34 GPa and T≈622-688℃respectively as measured with geobarometry Grt-Omp-Phe and geothermometer *** will provide a new reference for the understanding of Paleo-Tethyan *** this paper,two samples of eclogites were chosen for LA-ICP-MS zircon U-Pb dating and their 206pb/238U ages obtained are 240±3 Ma and 244±1 Ma ***,the zircons feature extremely low Th/U ratio(<0.01),extremely low content ofNb,Ta,and HREE,and invisible negative Eu ***,the genesis of the zircons shall be eclogites-facies metamorphism,indicating that the 240-245 Ma determined in this paper shall be the age of eclogites-facies metamorphism and may represent the westward subduction-collision epoch of Paleo-Tethys Ocean located betwee

关键词： Eclogite Omphacite Jinsha River suture zone Geological survey engineering qinghai-Tibet plateau Eastern Tibet China

Enhanced rate capability and cycle stability of Ti2C MXene for sodium storage through an aniline molecules welding strategy

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Tungsten 2025年第1期7卷 161-171页

作者： Hao Chen ya-qin Wang dong-Ting Zhang Bei Zhao Min-Peng Li Chen-yang Li Tian-Peng Xu Mao-Cheng Liu State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou University of Technology School of Materials Science and Engineering Lanzhou University of Technology School of Computer and Communication Technology Lanzhou University of Technology

MXenes obtained significant attention in the field of energy storage devices due to their characteristic layered structure,modifiable surface functional groups,large electrochemically active surface,and regulable interlayer ***,the self-restacking and sluggish ions diffusion kinetics performance of MXenes during the alkali metal ions insertion/extraction process severely impedes their cycle stability and rate *** paper proposes an aniline molecule welding strategy for welding p-phenylenediamine（PPDA） into the interlayers of Ti2C through a dehydration condensation *** welded PPDA molecules can contribute pillar effect to the layered structure of *** pillar effect effectively maintains the structural stability during the sodium ions insertion/extraction process and effectively expands the interlayer spacing of Ti2C from 1.16 to 1.38 nm,thereby enhancing ions diffusion kinetics performance and improving the long-term cycle *** Ti2C-PPDA demonstrates outstanding Na+storage capability,exhibiting a specific capacity of 100.2 mAh·g-1at a current density of 0.1 A·g-1over 960 cycles and delivering a remarkable rate capability 81.2 mAh·g-1at a current density of 5 A·*** study demonstrates that expanding interlayer spacing is a promising strategy to enhance the Na+storage capacity and improve long-term cycling stability,which provides significant guidance for the design of two-dimensional Na+storage materials with high-rate capability and cycle stability.

关键词： Diffusion kinetics Expanding interlayer spacing Rate capability Sodium ions storage Ti2C

论上市公司收购中的中小股东保护——以目标公司为视角

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当代法学 2008年第1期22卷 113-119页

作者：秦亚东杨健哈尔滨理工大学法学院黑龙江哈尔滨150040

上市公司的收购行为涉及到多方主体的利益,而在这些利益的主体中,目标公司的中小股东常处于不利地位,其合法权益最容易受到侵害。应当从立法保护、行政监管、司法救济的角度分别说明对中小股权益的保护的制度完善,从而达到目标公司的中... 详细信息

上市公司的收购行为涉及到多方主体的利益,而在这些利益的主体中,目标公司的中小股东常处于不利地位,其合法权益最容易受到侵害。应当从立法保护、行政监管、司法救济的角度分别说明对中小股权益的保护的制度完善,从而达到目标公司的中小股东权利内部保护机制和外部保护机制的统一。

关键词：上市公司收购中小股东

论我国资产证券化的法律风险——从美国次贷危机谈起

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当代法学 2009年第2期23卷 64-69页

作者：秦亚东杨健哈尔滨理工大学法学院黑龙江哈尔滨150040

随着美国次贷危机的蔓延,我国资产证券化的法律风险不容忽视。在确认资产证券化的安全价值并强化风险隔离机制的同时,需要关注资产证券化立法自身缺陷所引起的法律风险。

关键词：资产证券化次贷危机美国法律风险风险控制

Induced neural stem cells regulate microglial activation through Akt-mediated upregulation of CXCR4 and Crry in a mouse model of closed head injury

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Neural Regeneration Research 2025年第5期20卷 1416-1430页

作者： Mou Gao qin dong Dan Zou Zhijun yang Lili Guo Ruxiang Xu Department of Neurosurgery Sichuan Academy of Medical Sciences and Sichuan Provincial People’s HospitalSchool of MedicineUniversity of Electronic Science and Technology of ChinaChengduSichuan ProvinceChina Department of Neurosurgery Chinese PLA General HospitalBeijingChina Department of Neurology Fu Xing HospitalCapital Medical UniversityBeijingChina

Microglial activation that occurs rapidly after closed head injury may play important and complex roles in neuroinflammation-associated neuronal damage and *** previously reported that induced neural stem cells can modulate the behavior of activated microglia via CXCL12/CXCR4 signaling,influencing their activation such that they can promote neurological ***,the mechanism of CXCR4 upregulation in induced neural stem cells remains *** this study,we found that nuclear factor-κB activation induced by closed head injury mouse serum in microglia promoted CXCL12 and tumor necrosis factor-αexpression but suppressed insulin-like growth factor-1 ***,recombinant complement receptor 2-conjugated Crry(CR2-Crry)reduced the effects of closed head injury mouse serum-induced nuclear factor-κB activation in microglia and the levels of activated microglia,CXCL12,and tumor necrosis factor-α.Additionally,we observed that,in response to stimulation(including stimulation by CXCL12 secreted by activated microglia),CXCR4 and Crry levels can be upregulated in induced neural stem cells via the interplay among CXCL12/CXCR4,Crry,and Akt signaling to modulate microglial *** agreement with these in vitro experimental results,we found that Akt activation enhanced the immunoregulatory effects of induced neural stem cell grafts on microglial activation,leading to the promotion of neurological recovery via insulin-like growth factor-1 secretion and the neuroprotective effects of induced neural stem cell grafts through CXCR4 and Crry upregulation in the injured cortices of closed head injury ***,these beneficial effects of Akt activation in induced neural stem cells were positively correlated with the therapeutic effects of induced neural stem cells on neuronal injury,cerebral edema,and neurological disorders post–closed head *** conclusion,our findings reveal that Akt activation may enhance the immunoregulatory effects of induced neura

关键词： Akt signaling cerebral edema closed head injury Crry CXCR4 induced neural stem cell microglia neuroinflammation

UPLC同时测定野菊花药材中10个黄酮和有机酸的含量

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药物分析杂志 2019年第3期39卷 451-457页

作者：戴胜秦亚东梁枫安徽中医药高等专科学校芜湖240001

目的:建立UPLC同时测定野菊花药材中绿原酸、咖啡酸、1,3-二咖啡酰奎宁酸、木犀草素-7-O-β-D-葡萄糖苷、3,4-二咖啡酰奎宁酸、3,5-二咖啡酰奎宁酸、4,5-二咖啡酰奎宁酸、木犀草素、蒙花苷及芹菜素10个成分含量的方法。方法:采用Agilent... 详细信息

目的:建立UPLC同时测定野菊花药材中绿原酸、咖啡酸、1,3-二咖啡酰奎宁酸、木犀草素-7-O-β-D-葡萄糖苷、3,4-二咖啡酰奎宁酸、3,5-二咖啡酰奎宁酸、4,5-二咖啡酰奎宁酸、木犀草素、蒙花苷及芹菜素10个成分含量的方法。方法:采用Agilent Eclipse Plus C_(18)色谱柱(2.1 mm×100 mm,1.8μm);以甲醇(A)-0.3%磷酸水溶液(B)为流动相,梯度洗脱,流速0.4 mL·min^(-1);检测波长326 nm;柱温25℃。结果:10个成分在38 min内均达到基线分离,线性关系良好(r>0.999 2,n=6);平均回收率均在96.4%～103.2%(RSD<2.0%,n=6);测定的6批样品中上述10个成分含量范围分别为1.018～3.430、0.079～0.365、0～0.269、1.198～2.754、0.185～0.765、1.135～6.659、0.587～2.808、0.103～1.663、0.495～13.050、0.214～0.933 mg·g^(-1)。结论:本方法操作简单,准确性和重复性良好。可用于野菊花药材的多成分同步测定,为野菊花的全面质量评价和质量控制提供科学依据。

关键词：野菊花超高效液相色谱法黄酮有机酸咖啡酰奎宁酸含量测定质量标准多组分同时测定