Common Pb Isotope Mapping of UHP Metamorphic Zones in Dabie Orogen, Central China: Implication for Plumbotectonics in Subducted Continental Crust     

SHEN Ji  WANG Ying  LI Shuguang 《地质学报》2013,87(Z1):373-373

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Deep Structure Beneath the Southwestern Section of the Longmenshan Faults and Lushan Ms7.0 Earthquake on 20 April 2013     

ZHAN Yan  ZHAO Guoze  Martyn Unsworth  WANG Lifeng  CHEN Xiaobin  LI Tao  QIAO Qibin  WANG Jijun  TANG Ji  CAI Juntao  WANG Yuanzhao 《《地质学报》英文版》2013,87(Z1):421-424

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Electrical Struture of the Crust in Manas Earthquake Area,Xinjiang,China     

Zhao Guoze  Zhan Yan  Tang Ji  Zhao Junmeng  Jin Guangwen  Deng Qianhui  and Wang Jijun 《中国地震研究》2000,14(1):75-85

Magnetotelluric sounding data obtalned recently in Manas earthquake area were processed. Inthe result, curves of apparent resistivity, impedance Phase, skewness and optimum rotationangle versus period and the real magnetic induction vectors were obtained. Then the data ofall measuring points were interpreted by 2D automatic inversion. The result indicates thatalong the sounding profile the shallow crust can be divided into 5 segments and the deep crustcan be divided into 3 segments, with faults or deep-seated fault zones as the contactboundaries between them. The sedimentary cover along the profile extents down to depthabout 12 km in maximum and a low-resistivity body exists in the crust in southern section ofthe profile. The interpretation results are well consistent with geological and othergeophysical data. The Manas M7. 7 earthquake occurred near a contact zone where theelectrical structure of the crust sharply changes.  相似文献   

一种亟待重新认识的铜矿床——滇中土状铜矿   总被引：2，自引：0，他引：2  

李志群  任治Ji 《地质与勘探》2000,36(3):11-14

滇中土铜矿长期被认为是一种不可利用的铜矿床,新的湿法冶金技术应用使之成为了效益型铜资源。滇中土状铜矿产于中元古界昆阳群落雪组的土状风化壳内,分为面型和线型两种矿床类型。主要铜矿物为孔雀石、硅孔雀石、微粒状赤铜矿和黑铜矿、少量残余含铜硫化物。其矿石平均品位同于原生硫化矿。与原生矿石相比,土状氧化铜矿石ＳｉＯ２、Ａｌ２Ｏ３、Ｆｗ２Ｏ３、Ｍｎｏ明显富集,ＣａＯ与ＭｇＯ大量淋失,由碱性矿石变成了可酸浸的非  相似文献   

The 2020/21 Extremely Cold Winter in China Influenced by the Synergistic Effect of La Niña and Warm Arctic     

Fei ZHENG  Yuan YUAN  Yihui DING  Kexin LI  Xianghui FANG  Yuheng ZHAO  Yue SUN  Jiang ZHU  Zongjian KE  Ji WANG  Xiaolong JIA 《大气科学进展》2022,39(4):546-552

In the first half of winter 2020/21,China has experienced an extremely cold period across both northern and southern regions,with record-breaking low temperatures set in many stations of China.Meanwhile,a moderate La Ni?a event which exceeded both oceanic and atmospheric thresholds began in August 2020 and in a few months developed into its mature phase,just prior to the 2020/21 winter.In this report,the mid?high-latitude large-scale atmospheric circulation anomalies in the Northern Hemisphere,which were forced by the negative phase of Arctic Oscillation,a strengthened Siberian High,an intensified Ural High and a deepened East Asian Trough,are considered to be the direct reason for the frequent cold surges in winter 2020/21.At the same time,the synergistic effect of the warm Arctic and the cold tropical Pacific(La Ni?a)provided an indispensable background,at a hemispheric scale,to intensify the atmospheric circulation anomalies in middle-to-high latitudes.In the end,a most recent La Ni?a prediction is provided and the on-coming evolution of climate is discussed for the remaining part of the 2020/21 winter for the purpose of future decision-making and early warning.  相似文献   

QBO Signal in total ozone over Tibet     

Zou Han  Ji Chongping  Zhou Libo 《大气科学进展》2000,17(4):562-568

1. IntroductionOzone is one of the trace gases in the atmosphere distributed in 10--50 km altitude withthe maximum in 20--28 km. Ozone is significant in the following three aspects impacting theclimate and environment: 1) Ozone absorbs harmful solar ultra--violet radiation for protecting the ecological system on the Earth; 2) ozone heats the stratosphere and forces the circulation systems in this layer; 3) ozone variation in the stratosphere can change the incomingradiation at the surface leve…  相似文献   

PyMsOfa: A Python Package for the Standards of Fundamental Astronomy(SOFA) Service     

Jianghui Ji  Dongjie Tan  Chunhui Bao  Xiumin Huang  Shoucun Hu  Yao Dong  Su Wang 《天文和天体物理学研究(英文版)》2023,(12):186-191

The Standards of Fundamental Astronomy(SOFA) is a service provided by the International Astronomical Union that offers algorithms and software for astronomical calculations, which was released in two versions for FORTRAN77 and ANSI C, respectively. In this work, we implement the Python package PyMsOfa for SOFA service by three ways:(1) a Python wrapper package based on a foreign function library for Python(ctypes),(2) a Python wrapper package with the foreign function interface for Python callin...  相似文献   

Enrichment Regular of Trace Elements in the Huijiabao Gold Field     

ZHAO Tingyan  GONG Fanying  LIU Peng  WANG Yang  LI Yongling  CHEN Ji  ZHU Wei  LIU Linlin  CHEN Rongbin 《《地质学报》英文版》2014,88(Z2):848-849

Please refer to the attachment(s) for more details  相似文献   

Research on the temperature field of a partially freezing sand barrier with groundwater seepage     

LiYan Lao  ZhiQiang Ji  LiangLiang Huang  ShangJing Li 《寒旱区科学》2017,9(3):280-288

To study the distribution characteristics and variation regularity of the temperature field during the process of seepage freezing,a simulated-freezing test with seepage of Xuzhou sand was completed by using a model test developed in-house equipment.By means of three group freezing tests with different seepage velocities,we discovered the phenomenon of the asymmetry of the temperature field under the influence of seepage.The temperature upstream was obviously higher than that downstream.The temperature gradient upstream was also steeper than that downstream.With a higher seepage velocity,the asymmetry of the temperature field is more pronounced.The asymmetry for the interface temperature profile is more strongly manifest than for the main surface temperature profile.The cryogenic barrier section is somewhat"heartshaped".With the increasing velocity of the seepage flow,the cooling rate of the soil decreases.It takes much time to reach the equilibrium state of the soil mass.In our study,seepage flow velocities of 0 m/d,7.5 m/d,and 15 m/d showed the soilcooling rate of 4.35°C/h,4.96°C/h,and 1.72°C/h,respectively.  相似文献   

全球植被与大气之间碳通量的模式估计   总被引：15，自引：0，他引：15  

Li Yinpeng  Ji Jinjun 《大气科学进展》2001,18(5):807-818

用大气植被相互作用模式(AⅥM)模拟了全球陆地植被的净初级生产力(NPP)。AⅥM由相互耦合的两部分组成：物理过程，包括陆地表面水分和能量在土壤、植被与大气之间的传输；以及生理生态过程，如：光合、呼吸、干物质分配、凋落和物候等。全球的植被分为13类，土壤按质地分为6类。用EMDI提供的全球1637个包括不同植被类型的NPP观测点数据对模型进行了检验。NPP模拟的结果表明：全球陆地植被的平均NPP为405.13 g C m-2yr-1，不同植被类型的平均NPP变化范围在99.58 g C m-2yr-l(苔原)到996.2 g C m-2yr-l(热带雨林)之间。全球年总NPP为60.72 Gt C yr-l，其中最大的部分为热带雨林，15.84 Gt C yr-1，占全球的26.09％。最大的碳汇是在北半球的温带。模式模拟的NPP在全球的空间和季节分布是合理的。  相似文献