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NORMAL-SLIP ALONG THE NORTHERN ALTYN TAGH FAULT, NORTH TIBET

地学前缘 2000年第S1期7卷 237-238页

作者： Yin An 1, George Gehrels 2. Chen Xunhua 3, Wang Xiao\|Feng 3, T. Mark Harrison 1, Shen Jie 1[WT5,5”BX](1 Department of Earth and Space Sciences and institute of geophysics and {2. Physics,{4., Los Angeles, ca 90095\

The east\|west striking Northern Altyn Tagh Fault, about 2.0km long between Bashkaogong (90°E, 39°2.′N) and Lapeiquan (92.15′E, 39°2.′N), was previously mapped as a north\|dipping thrust, juxtaposing late Archean\|Mesoproterozoic gneisses in the hanging wall over Paleozoic vol{4.nics, plutons, turbidite, and melange complexes in the footwall. In order to estimate the total magnitude of slip along the Cenozoic Altyn Tagh fault, we conducted geologic mapping along four traverses across the Jinyan Shan where the fault lies. Our field observations suggest that the fault is south\|dipping, with dip angles varying from 2.° in the east to about 4.° in the west. The eastern fault zone exhibits mylonitic fabrics, whereas the western fault zone is characterized by {4.taclastic deformation. Kinematic indi{4.tors in the ductily deformed mylonitic shear zone consistently show a top\|to\|the\|south sense of shear, suggesting that the Northern Altyn Tagh fault is a south\|dipping normal fault, not a north\|dipping thrust.. The ductile shear zone is typi{4.lly 30～4.m thick, consisting of highly sheared metasediments (pelite and marble), granites, and granitic *** latter are systemati{4.lly cut by small\|s{4.le, south\|dipping ductile normal faults with displacements between 10s of cm to several meters, forming spectacular asymmetric boudinages in the sheared meta\|pelite *** minimum displacement along the detachment is about 2.km, as measured by the north\|south width of the exposed footwall gneisses. We renamed the Northern Altyn Tagh Fault in the Jinyan Shan region as the Lapeiquan detachment fault to avoid confusion with other east\|west trending Cenozoic faults to the west along the northern edge of the Altyn Tagh range (e.g., the Cenozoic Jianglisai fault near Qiemo), collectively known as the Northern Altyn Tagh fault system (see Cowgill et al., Geology,in press). The lower age bound of the Lapeiquan fault is Ordovician, as the fault cuts Ordovician vol{4.nics and plut

关键词： detachment fault Northern Altyn Tagh Fault Tibet

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Regional Seismic Characteristics of the 9 October 2.06 North Korean Nuclear Test

Regional Seismic Characteristics of the 9 October 2006 North...

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中国科学院地质与地球物理研究所2.08学术年会

作者： Lian-Feng Zhao,Xiao-Bi Xie,Wei-Min Wang,and Zhen-Xing Yao institute of Geology and geophysics Chinese Academy of Sciences 19 Beituchengxilu,Chaoyang District Beijing 10002.,China institute of geophysics and planetary Physics university of california at santa cruz 1156 High Street santa cruz,california 95064.institute of Tibetan Plateau Research Chinese Academy of Sciences 18 Shuangqinglu,Haidian District Beijing 100085,China

We investigate the regional seismic signature of the 9 October 2.06 North Korean nuclear *** regional data for the nuclear test and a group of earthquakes close to the test site were obtained between December 2.00 and November *** distances from the stations to the test site are between 371 and 1153 *** first use these regional events to calibrate the Lg-wave magnitude in the *** the network is used to calculate m(Lg) = 3.93 for the North Korean nuclear *** a modified fully coupled magnitude-yield relation,the yield of the North Korean nuclear test is estimated to be 0.4. *** of large uncertainties in the source depth,the estimate is *** P/S-type spectral ratios Pg/Lg,Pn/Lg,and Pn/Sn are calculated for the nuclear explosion and a group of earthquakes close to the test *** frequencies above 2.Hz,the network-averaged P/S spectral ratios clearly separate the 9 October 2.06 explosion from the regional *** result indicates that a single-blast explosion in the North Korea region shows different seismic characteristics from an *** well-coupled single-blast explosion detonated in this region with yield similar to that for the North Korean nuclear test has a large probability of being identified by a regional seismic network such as the one adopted in this study.

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Helium isotope investigation on magnetic reversal boundaries of loess-paleosol sequence at Luochuan, central Chinese Loess Plateau

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Chinese Science Bulletin 2007年第17期52卷 2407-2412页

作者： DU XueQing1,6, WANG YongHong2. REN JianGuo3, YE XianRen4.& LU HuaYu5,1 1 State Key Laboratory of Loess and Quaternary Geology, institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China 2.College of Marine Geosciences, Ocean {4. of China, Qingdao 2.6003, China 3 National Natural Science Foundation of China, Beijing 100085, China 4.Lanzhou Research Center for Petroleum and Natural Gas Resources, institute of Geology and geophysics, Chinese Academy of Sciences, Lanzhou 730000, China 5 Key Laboratory of Coast and Island Development, School of Geographic and Oceanographic Sciences, Nanjing {4., Nanjing 2.0093, China 6 Graduate {4. of Chinese Academy of Sciences, Beijing 10004., China State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi’an China Graduate university of Chinese Academy of Sciences Beijing China College of Marine Geosciences Ocean University of China Qingdao China National Natural Science Foundation of China Beijing China Lanzhou Research Center for Petroleum and Natural Gas Resources Institute of Geology and Geophysics Chinese Academy of Sciences Lanzhou China Key Laboratory of Coast and Island Development School of Geographic and Oceanographic Sciences Nanjing University Nanjing China

Extraterrestrial particles have higher 3He/4.e ratios than those of terrestrial sediments ( > 100 Ra versus < 0.03 Ra, where Ra is the 3He/4.e ratio normalized to the atmospheric value of 1.4.10?6). The inter- planet... 详细信息

Extraterrestrial particles have higher 3He/4.e ratios than those of terrestrial sediments ( > 100 Ra versus 4.e ratio normalized to the atmospheric value of 1.4.10?6). The inter- planetary dust particles (IDPs), which are very rich in 3He, continuously bombard the Earth and can accumulate in deposits. IDPs sedimentation rate changes can significantly influence 3He concentration in the Earth surface sediments. Since IDPs are not easy to detect in terrestrial deposits, measuring helium isotopes is a helpful approach to examine changes in IDPs. Helium concentration and helium isotopic composition magnetic substances and the quartz particles were examined for helium concen- tration and helium isotopic ratio. Results show that the 3He/4.e ratio and the 3He concentrations of the magnetic substances are clearly higher than those of the bulk samples and the quartz particles, and, the 3He/4.e ratio of the extracted magnetic substances is also higher than that of the average level of the Earth’s crust. The higher helium content in the magnetic fractions can be explained by an influx of IDPs.

关键词：中国黄土高原古土壤氦同位素行星际尘埃颗粒反方向磁化

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中国东部地区的壳-幔过渡带结构

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地球物理学报 2018年第3期61卷 845-855页

作者：孙伟家符力耘魏伟林羿唐清雅中国科学院地质与地球物理研究所中国科学院地球与行星物理重点实验室北京100029 中国科学院地球科学研究院北京100029 中国石油大学(华东)地球科学与技术学院山东青岛266580 中国科学院地质与地球物理研究所中国科学院页岩气与地质工程重点实验室北京100029

莫霍面是地壳和上地幔的边界,但莫霍面并不是一个简单的"面",而是一个反映地壳和地幔物质交换、相互作用等动力学意义的"过渡带".本文综合深地震反射、宽角地震折射和高温高压岩石物理实验结果,确定壳-幔过渡带的地震P波速度变化范围为6... 详细信息

莫霍面是地壳和上地幔的边界,但莫霍面并不是一个简单的"面",而是一个反映地壳和地幔物质交换、相互作用等动力学意义的"过渡带".本文综合深地震反射、宽角地震折射和高温高压岩石物理实验结果,确定壳-幔过渡带的地震P波速度变化范围为6.8~7.5km·s-1.在克拉通等构造活动稳定地区壳-幔过渡带内的速度梯度强且壳-幔过渡带厚度薄,而在造山带等构造活动区域壳-幔过渡带内的速度梯度弱且壳-幔过渡带厚.中国东部地区的壳-幔过渡带的平均厚度约为5~10km,在四川盆地下方最薄(<5km),而在华北克拉通中部造山带下方的壳-幔过渡带最厚(~30km).综合地球化学结果,华北中部巨厚壳-幔过渡带主要是幔源岩浆的底侵作用和堆晶作用而形成.

关键词：壳-幔过渡带地震波传播层析反演地震光照成像底侵作用

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The evolution of electron current sheet in guide field reconnection

The evolution of electron current sheet in guide field recon...

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第十四届全国日地空间物理学术研讨会

作者： Quanming Lu can Huang Zhongwei Yang Mingyu Wu and Shui Wang ( Department of geophysics and planetary Sciences, {2. of Science and Technology of China, Hefei 2.002., China )

Two-dimensional （2.D） particle-in-cell （PIC） simulations are performed to investigate the evolution of the electron current sheet （ECS） in guide field reconnection. The ECS is formed by electrons accelerated by the inductive electric field in the vicinity of the X line, which is then extended along the x direction due to the imbalance between the electric field force and Ampere force. The tearing instability is unstable when the ECS becomes sufficiently long and thin, and several seed islands are formed in the ECS. These tiny islands may coalesce and form a larger secondary island in the center of the diffusion region.

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planetary wave oscillations in sporadic E layer occurrence at Wuhan

Planetary wave oscillations in sporadic E layer occurrence a...

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中国科学院地质与地球物理研究所2.08学术年会

作者： Xiaomin Zuo~(1,2.3,4. and Weixing Wan~1 1 institute of Geology and geophysics,Chinese Academy of Sciences,Beijing,10002.,China 2.Mathematics and Physics Department,China {2. of Geosciences,4.0074.China 3 Wuhan institute of Physics and Mathematics,Chinese Academy of Sciences,China 4.Graduate School,Chinese Academy of Sciences,China

Quasi 6-day oscillations in E occurrence were observed to occur in relation with planetary wave activity at Wuhan,China(30.6°N,114.5°E).Wavelet analysis of E occurrence time series revealed that a strong 5- to 7-day oscillation was present during the period from about day 12. to 137 of *** same quasi 6-day planetary wave oscillation was also found to dominate the spectrum of concurrent wind data measured in the 80- to 100-km region by a meteor radar,in agreement with the E *** is also a great deal of similarity between the 5- to 7-day band-pass filtered waveforms of E occurrence and the wind *** estimating the wave phase changes with altitude,the quasi 6-day PW in the zonal wind was found to be in phase with the sporadic E layer critical frequency,fE,at about 115 km,close to the observed E *** quasi 6-day PW modulation was also present in the amplitude of the 12.h and 2.-h periodicities which existed in the fE time *** present results provide new evidence in favor of a planetary wave indirect role on E formation through the modulation of tides,which in line with previous studies by Haldoupis and Pancheva(2.02.,and Pancheva et al.(2.03).

关键词： Sporadic E layers planetary waves atmospheric tides PW modulation of tides

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Coesite inclusions in zircon from gneisses identified by laser Raman microspectrometer in ultra-high pressure zone of Dabie Mountains,China

Coesite inclusions in zircon from gneisses identified by las...

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中国科学院地质与地球物理研究所2.01学术年会

作者： LIU Jingbo~1,YE Kai~1 CONG Bolin~1, Maruyama Shegnori~2.& FAN Hongrui~1 1.institute of Geology and geophysics,Chinese Academy of Sciences, Beijing 10002.,China 2.Department of Earth and {2. Sciences,Tokyo institute of Technology, 2.12.1 Ookayama,Meguro Tokyo,152.Japan

The mineral inclusions in zircon from gneisses in ultra-high pressure(UHP) zone of the Dabie Mountains were identified by using a laser Raman microspectrometer. Coesite occurs as inclusions in zircons from all types of *** important minerals,such as jadeite,omphacite, aragonite,barite,and anhydrite were also found as inclusion *** discoveries indicate that(i) gneissic country rocks had metamorphosed at the same time as the enclosed eclogites;and(ii) SO -bearing fluids were present in the UHP metamorphic process,which is manifested by occurrence of barite and anhydrite coexisting with coesite.

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Magnetic cloud new model-fitted parameters with force-free cylindrically assumptions

Magnetic cloud new model-fitted parameters with force-free c...

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第十四届全国日地空间物理学术研讨会

作者： Yuming Wang1 Zhenjun Zhou1 (1 caS Key Laboratory of Geospace Environment, Department of geophysics & planetary Sciences, {2. of Science & Technology of China, Hefei, Anhui 2.002., China)

This paper briefly compares our study done on simulating various output fit parameters resulting from a force-free interplanetary magnetic cloud model with lepping’s model [Lepping et al., 1990] aiming at carrying out a more specific method to describe the magnetic flux rope geometry. 64.clouds observed in WIND data over the years 1998 to 2.05 are used in our study. In the model Yuming Wang proposes, expansion , rotational velocity and other velocities are accounted. Through our modified model, the speed of MC expansion at 1AU can quantitatively be fitted and the results can be well consistent with lepping’s Estimates using WIND magnetic field and plasma data analysis [Lepping et al., 2.08].

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DIRECT DATING OF LEFT-LATERAL SLIP ALONG THE RED RIVER SHEAR ZONE

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地学前缘 2000年第S1期7卷 275-275页

作者： Lisa Gilley 1, T. Mark Harrison 1,F.J. Ryerson 2.P.H. Leloup 3,Wang Jianghai 4.1 Department of Earth and Space Sciences & IGPP, UCLA, Los Angeles, ca, 90095\|1567, USA. 2.institute of {4. & {2. Physics, Lawrence Livermore N

The Red River Shear Zone (RRSZ), which extends from eastern Tibet to the South China Sea, plays a central role in the hypothesis that strike\|slip extrusion of Indochina accommodated a significant portion of Indo\|Asian convergence. The massifs of the RRSZ, the only known mid\|crustal section exposed through a transform plate boundary, contain high\|grade metamorphic rocks that are believed to have been plastically deformed in a left\|lateral sense during the mid\|Tertiary. While the history of diachronous transtension along the RRSZ was previously obtained for temperatures below the brittle\|ductile transition from argon thermochronometry, the precise timing of high temperature deformation and the magnitude of strain have not been directly determined. This is a significant limitation to testing the extrusion model as magnetic anomalies from the South China Sea, interpreted to be a pull apart basin at the SE termination of the RRSZ, specifically predict that slip occurred between 35～17Ma at a rate of 3～5cm/a.

关键词： the Red River Shear Zone Ailao Shan Day Nui Con Voi Th\| Pb monazite

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CENOZOIC FAULTING ALONG THE SOUTHEASTERN EDGE OF THE TIBETAN PLATEAU IN THE YANYUAN AREA AND ITS TECTONIC IMPLIcaTIONS

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地学前缘 2000年第S1期7卷 269-269页

作者： Wang Erchie 1, Burchfiel B. Clark 2.WT5,5”BX](1 institute of Geology and geophysics, Chinese Academy of Science,Beijing 10002.,China 2.Department of Earth, Atmospheric and {2. Sciences, MIT,cambridge, MA 02.39,UK)

The southeastern edge of the Tibetan plateau is marked by several thrust sheets trending roughly in E\|W direction. The Yanyuan thrust sheet is bounded by three arcuate thrust belts, marked by high mountain ranges with the Jinhe belt on the north, the Qianhe belt on the south and the Ninglang belt on the west. Within the Yanyuan thrust belt are sedimentary cover rocks of the Yangtze platform, with ages ranging from Sinian to Triassic. In the north, the thrust sheet is overlain by the Muli thrust sheet along the Jinhe belt, while in the south, it is underlain by the Kangdian paleoland along the Qianhe belt. The youngest rocks on the foot wall are late Eocene to Oligocene in age, indicating that the thrusting occurred in the late Tertiary. The top of the Yanyuan thrust belt is truncated by a flat erosion surface similar to that on the plateau to the north. Along a north\|dipping normal fault bordering the Yanyuan basin on the south, the erosion surface is tilted to the south against Triassic rocks. The basin is filled with coal\|bearing clastic sediments of Pliocene and early Pleistocene age, which gives the timing of the normal faulting. Based on the faulting pattern, we propose that the southeastern edge of the Tibetan plateau underwent a large amount of N\|S shortening and uplift along the Yanyuan thrust sheet in the late Tertiary, while the subsequent normal faulting that had occurred along the Yanyuan basin during the Pliocene and Pliocene can be interpreted to have accommodated gravitational collapse of the crust.

关键词： southeastern edge of the Tibetan plateau Yanyuan thrust shee t crustal shortening and uplift normal faulting gravitational collapse

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