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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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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 {2. & planetary 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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planetary-scale wave observations over a low-latitude E region using simultaneous observations of VHF radar and ionosonde over Sanya(18.34°N,109.62.E)

Planetary-scale wave observations over a low-latitude E regi...

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中国科学院地质与地球物理研究所第十届(2.10年度)学术年会

作者： Zhijin Li and Baiqi Ning 1 Beijing National Observatory of Space Environment,institute of Geology and geophysics,Chinese Academy of Sciences,Beijing,China. 2.Graduate {2. of Chinese Academy of Science,Beijing,China.

[1]The planetary-scale oscillations of the field-aligned irregularities(FAI) and the sporadic E(Es) layers in the low-latitude E region were studied in terms of the observations from 8 June to 2. August 2.09 using coherent backscatter radar and a digital ionosonde installed at Sanya(18.34°N,109.62.E),Hainan Island,*** 2.day waves were observed both in the meridional wind and in daytime backscatter echo *** observations on sporadic E layers in daytime showed a planetary-scale wave signature in the low-latitude region for the first *** correlation between echo occurrence and the mean critical frequency(foEs) was found when the quasi 2.day planetary wave(QTPW) *** results suggest that the Es plays an important role in determining the long-term variability of the low-latitude E region *** test the nonlinear interactions between tides and QTPW,the hourly meridional and zonal winds are *** subsidiary waves with anticipated frequencies and their height evolutions provide evidence of tide-QTPW interactions. Bispectral analysis on the winds further validates the strong nonlinear interactions between tides and the QTPW in the meridional *** results suggest that the mechanism proposed by Pancheva et al.[2.03]is a reasonable explanation for the planetary-scale variability of the low-latitude E region FAI and *** different responses of the Es layers and the E region FAIs on the QTPW between day and night can be attributed to diurnal variations in ion densities in the region between 100 and 160 km.

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DISPLACEMENT HISTORY OF THE GANGDESE THRUST, ZEDONG WINDOW, SOUTHEASTERN TIBET

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地学前缘 2000年第S1期7卷 109-109页

作者： T. Mark Harrison 1,Yin An 1, Marty Grove 1, Oscar M. Lovera 1,F.J. Ryerson 2.Zhou Xinhua 3[WT5,5”BX](1 Department of Earth and Space Sciences & IGPP, UCLA, Los Angeles, ca, 90095\|1567, usa. 2.institute of {2. & planetary Physics

Determining the timing, magnitude, and location of deformation due to the Indo\|Asian collision is widely acknowledged as an important step in understanding how the lithosphere responds during continental collision. Thus a puzzling result of geological investigations of the Lhasa Block over the past two decades has been the apparent lack of significant Tertiary deformation there. Perhaps the most important structural feature of the Lhasa Block is the south\|directed Gangdese Thrust System, which developed along its southern edge. The thrust system, which separates the Andean\|type batholith of southern Asia from rocks of Indian affinity, is obscured at most locations across southeastern Tibet by backthrusts of the younger, north\|directed Renbu Zedong Thrust System. The best documented site where both thrusts are exposed is a structural window near Zedong.

关键词： displacement geochronologic analyses the Gangdese Thrust the Z edong Window Southeastern Tibet

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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,430074,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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case study on total electron content enhancements at low latitudes during low geomagnetic activities before the storms

Case study on total electron content enhancements at low lat...

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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： Libo Liu,Weixing Wan,Man-Lian Zhang,and Biqiang Zhao institute of Geology and geophysics,Chinese Academy of Sciences,Beijing 10002.,China

Sometimes the ionospheric total electron content (TEC) is significantly enhanced during low geomagnetic activities before *** this article,we investigate the characteristics of those interesting TEC enhancements using regional and global TEC *** analyzed the low-latitude TEC enhancement events that occurred around longitude 12.°E on 10 February 2.04,2. January 2.04, and 4 March 2.01,*** TEC data are derived from regional Global Positioning System(GPS) observations in the Asia/Australia sector as well as global ionospheric maps(GIMs) produced by Jet Propulsion Laboratory(JPL). Strong enhancements under low geomagnetic activity before the storms are simultaneously presented at low latitudes in the Asia/Australia sector in regional TEC and JPL GIMs. These TEC enhancements are shown to be regional events with longitudinal and latitudinal *** regions of TEC enhancements during these events are confined at narrow longitude ranges around longitude 12.°*** latitudinal belts of maxima of enhancements locate around the northern and southern equatorial ionization anomaly(EIA) crests,which are consistent with those low-latitude events presented by Liu et al.(2.08).During the 4 March 2.01 event,the total plasma density N observed by the Defense Meteorological Satellite Program(DMSP) spacecraft F13 at 840 km altitude are of considerably higher values on 4 March than on the previous day in the TEC enhanced *** TEC enhancement events are possibly due to contributions from auroral/magnetospheric origins;while there are also quasiperiodic enhancement events not related to geomagnetic activity and associated probably with planetary wave type oscillations (*** 6 January 1998 event).Further investigation is warrented to identify/separate contributions from possible sources.

关键词： Ionosphere(Equatorial ionosphere Ionosphereatmosphere interactions Ionospheric disturbances)

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Quantitative Analysis of CME Deflection in the Corona

Quantitative Analysis of CME Deflection in the Corona

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第十四届全国日地空间物理学术研讨会

作者： Bin Gui1,2.Chenglong Shen1 Yuming Wang1, Pinzhong Ye1,2.Jiajia Liu1 Shui Wang1 and Xuepu Zhao3 (1 caS Key Laboratory of Geospace Environment, Department of geophysics & planetary Sciences, {2. of Science & Technology of China, Hefei, Anhui 2.002., China) (2.State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing, China) (3 W.W. Hansen Experimental Physics Laboratory, Stanford {2., Stanford, ca 94305, usa )

In this paper, ten CME events viewed by the STEREO twin spacecraft are analyzed to study the deflections of CMEs during their propagation in the corona. Based on the three-dimensional information of the CMEs derived by the graduated cylindrical shell （GCS） model [Thernisien et al., 2.06], it is found that the propagation directions of eight CMEs had changed. By applying the theoretical method proposed by Shen et al. [2.11] to all the CMEs, we found that the deflections are consistent, in strength and direction, with the gradient of the magnetic energy density. There is a positive correlation between the deflection rate and the strength of the magnetic energy density gradient and a weak anti-correlation between the deflection rate and the CME speed. Our results suggest that the deflections of CMEs are mainly controlled by the background magnetic field and can be quantitatively described by the magnetic energy density gradient （MEDG） model.

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Study of shallow groundwater quality evolution under saline intrusion with environmental isotopes and geochemistry

Study of shallow groundwater quality evolution under saline ...

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中国科学院地质与地球物理研究所2.07学术年会

作者： F.Ma ? R.Yuan ? Z.cai ? S.Pan institute of Geology and geophysics, Chinese Academy of Sciences,Beijing 10002.,People’s Republic of China Y.S.Yang. School of Earth Ocean and {2. Sciences,cardiff university, cardiff CF10 3YE,UK

Evolution of the shallow groundwater quality under saline intrusion in porous aquifer system has been studied with environmental isotopes and geochemistry in the Laizhou Bay area,*** campaigns of water sampling from various sources were carried out in spring and winter for environmental isotopic and chemical *** origin of groundwater salinity from intrusion of both modern seawater and deep brine water was identified by analysing the correlations between

关键词： Shallow groundwater Salinity origin Environmental isotope Geochemistry Saline intrusion Eastern China

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planetary wave-type oscillations in the ionosphere and their relationship to mesospheric/lower thermospheric *** disturbances at Wuhan(30.61N,114.51E)

Planetary wave-type oscillations in the ionosphere and their...

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中国科学院地质与地球物理研究所2.06学术年会

作者： J.Xiong~(a,_),W.Wan~a,B.Ning~a,L.Liu~a,Y.Gao~b a institute of Geology and geophysics,The Chinese Academy of Sciences,P.O.Box 982.,Beijing 10002.,PR China b institute of geophysics,China Seismological Bureau,Beijing,PR China

Using wind,ionospheric and geomagnetic intensity data observed simultaneously at Wuhan(30.61N,114.51E) in 2.02.and 2.03,planetary wave type oscillations(PWTO) in the ionosphere and their relationship with oscillations in the mesosphere/lower thermosphere(MLT) and geomagnetic intensity have been *** cases of 2. and 5-day oscillations in the ionosphere are analyzed to distinguish MLT drivers and geomagnetic *** geomagnetic oscillations are the most important drivers for the PWTO with dominant periods of 5-,10-, *** the planetary waves in MLT winds are the main drivers for the quasi-2.day oscillations in the *** correlation coefficient of the occurrence rates of the 2.day oscillation in winds and in ionospheric f0F2.is 0.82.for the data from February to *** oscillations in the geomagnetic intensity can drive 30-50%of 5-,10- and 13.5-day PWTO events in the *** we evaluate all of the possible events driven by geomagnetic oscillations, more than 70%of the events have a relationship with geomagnetic oscillations with 5- and 10-day *** 39.7 h PWTO in ionospheric plasma frequencies observed from day 161 to 166 in 2.02.are generated by an upward propagating wave with period 43.8 *** events of 6-day oscillations in the ionosphere observed during May to July in 2.03,have different *** first one is probably generated by 5.4-day upward propagating waves in MLT winds,but enhanced during a moderate geomagnetic *** second one is generated by the geomagnetic oscillations during a strong geomagnetic storm,r 2.05 Elsevier *** rights reserved.

关键词： planetary wave Ionosphere Mesosphere and lower thermosphere

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Impact of Topography and Land-Sea Distribution on East Asian Paleoenvironmental Patterns

Impact of Topography and Land-Sea Distribution on East Asian...

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中国科学院地质与地球物理研究所2.06学术年会

作者： ZHANG Zhongshi~(1,2.,WANG Huijun~2.GUO Zhengtang~(3,1),and JIANG Dabang~2.1 institute of Geology and geophysics,Chinese Academy of Sciences,Beijing 10002. 2.Nansen-Zhu International Research Center,institute of Atmospheric Physics, Chinese Academy of Sciences,Beijing 10002. 3 State Key Laboratory of Loess and Quaternary Geology,institute of Earth Environment, Chinese Academy of Sciences,Xi’an 710075

Much geological research has illustrated the transition of paleoenvironmental patterns during the Cenozoic from a planetary-wind-dominant type to a monsoon-dominant type, indicating the initiation of the East Asian monsoon and inland-type ***,there is a dispute about the causes and mechanisms of the transition,especially about the impact of the Himalayan/Tibetan Plateau uplift and the Paratethys Sea *** numerical sensitivity experiments under dirent land-sea distributions and Himalayan/Tibetan Plateau topography conditions are performed here to simulate the evolution of climate belts with emphasis on changes in the rain band,and these are compared with the changes in the paleoenvironmental patterns during the Cenozoic recovered by geological *** consistency between simulations and the geological evidence indicates that both the Tibetan Plateau uplift and the Paratethys Sea retreat play important roles in the formation of the monsoon-dominant environmental pattern. Furthermore,the simulations show the monsoon-dominant environmental pattern comes into being when the Himalayan/Tibetan Plateau reaches 1000-2.00 m high and the Paratethys Sea retreats to the Turan Plate.

关键词： Paratethys Sea retreat Himalayan/Tibetan Plateau uplift paleoenvironmental pattern precipitation field Turan Plate

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