检索结果-南通市图书馆

Structure of the mantle transition zone in the central and western parts of the North China Craton using the receiver function 3D Kirchhoff migration method

引用

Science China Earth Sciences 2024年第9期67卷 2783-2795页

作者： Min ZHU Qingju wu Jieyuan NING Ruiqing ZHANG institute of geophysics China Earthquake AdministrationBeijing 100081China institute of Theoretical and Applied geophysics Peking UniversityBeijing 100871China

Using data from the regional broadband dense temporary array deployed by the ChinArray project,we applied the three-dimensional(3D)Kirchhoff migration method of the teleseismic P-wave receiver function to investigate discontinuity structures of the mantle transition zone(MTZ)in the central and western parts of the North China Craton(NCC)using a highresolution 3D velocity model of the East Asian *** results show that the 410-km discontinuity beneath the Datong Volcano is depressed by~10 km,indicating the presence of a high-temperature anomaly near the depth of 410 km,which is likely related to small-scale mantle upwelling caused by the dehydration of the stagnant Pacific Plate in the *** upwelling of hot material provides a heat source for surface magmatic *** the Bohai Bay Basin,significant subsidence of the 660-km discontinuity is observed,and the transition zone here is extensively ***’s suggested that the anomalies in this region are related to the stagnation of the Pacific slab in the *** the thickness of the transition zone west of the North-South Gravity Lineament appears normal,we propose that the subducting front of the Pacific slab did not cross the gravity lineament in the *** comparison,the small-scale subsidence of the 660-km discontinuity and the thickening of the MTZ observed north of the Hannuoba Volcano likely indicate that the slab crossed the gravity lineament at its turning point and remained in the ***,a local thickening of the MTZ is observed in the Dabie orogenic belt of the Qinling *** is believed to be a combined effect of lithospheric delamination into the transition zone in the lower Yangtze region and the stagnation of the Pacific Plate.

关键词： North China Craton Mantle transition zone Receiver function migration Datong Volcano

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

GRANITOIDS AND TETONIC EVOLUTION OF THE WEST KUNLUN OROGENIC BELT

引用

地学前缘 2000年第S1期7卷 228-229页

作者： Wang Yuanlong 1,Bi Hua 2. Wang Zhonggang 2. Zhu Xiaoqing 2.(1.institute of geology And {2., Chinese Academy of Science, beijing 10002.,China 2.institute of Geochemistry, Chinese Academy of Science, Guiyang 550002.China)

The West Kunlun orogenic belt, one of the least studied areas in China, is located at the junction between the Qinghai—Tibetan Plateau and Tarim Basin and has undergone intense tectonic action and frequent *** West Kunlun orogenic belt can be divided into five tectonic\|magmatic evolution stages according to the character of the igneous rocks, metamorphic rocks, sedimentation mode, tectonic phases and isotopic ages(Fig 1).Active stages have dominated with only short intervening stable stages. This kind of evolution is not simply repeated but that a later stage is elevation and development of its former ***\|time distribution of granitoids varies with each different tectonic\| magmatic stage as well as within different periods of the same tectonic\| magmatism stage. Take time into condition , It is an important turning movement of tectonics\|magmatism evolution during the Indo\|Sinian movement, as space the middle fault (Jiang Chunfa 1982. of the West Kunlun orogenic belt is a significant border o f tectonics\|magmatism evolution. Granitoids formed before Indo\|Sinian movement are mainly distributed to the north of the middle fault of West Kunlun. These granitoids are mostly granites of early and middle Proterozoic, Caledonian and Hercynian ages. A unique control on the granitoid evolution is that they become younger from NE to SW, crossing the regional structure line. Granitoids formed after Indo\|Sinian movement are mainly distributed to the south of the middle fault. But distribution of granitoids of early Yanshan cycle cut across the middle fault of West Kunlun Mountain. Their age distribution shows a bidirectional control with the granitoids becoming younger across the regional structural lines from NE and SW boundary fault to the interior of the fracture belts.

关键词： the West Kunlun orogenic belt tectonic\|magmatic evolution gr anitoids

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Major methods of seismic anisotropy

引用

Earthquake Research Advances 2024年第3期4卷 82-91页

作者： Xinai Zhao Jing wu State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing100049China

Seismic anisotropy reveals that seismic wave velocity, amplitude, and other physical properties show variations in different directions, which can be divided into lattice-preferred orientation(LPO) and shape-preferred orientation(SPO) according to its physical mechanisms. The main methods for studying seismic anisotropy include shearwave splitting analysis, P-wave travel time inversion and surface-wave tomography, etc. There are some differences and correlations among these methods. Seismic anisotropy is an important way to reveal the dynamic processes of crust-mantle evolution, and it is significant for monitoring crustal stress changes and improve seismic exploration studies. With the help of long-term observation, the application of machine learning techniques and combining inversion based on multiple phases would become potential developments in seismic anisotropy studies. This may improve the understanding of complex seismic anisotropic models, such as multiple layers anisotropy with an oblique axis of symmetry.

关键词： Seismic anisotropy Shear-wave splitting P-wave travel time inversion Surface-wave tomography

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

New geological evidence of crustal thickening in the Gangdese block prior to the Indo-Asian collision

引用

Chinese Science Bulletin 2003年第15期48卷 1604-1610页

作者： DING Lin & LAI Qingzhou institute of geology and {2., Chinese Academy of Sciences, beijing 10002., China Correspondence should be addressed to Ding Lin (e-mail: dinglin@ ***) Chinese Acad Sci Inst Geol & Geophys Beijing 100029 Peoples R China

Recent mapping in the Gangdese block has revealed many leucogranites that are similar to those in the High Himalaya. These leucogranites formed at ~140 Ma as indicated by monazite Th-Pb ion-microprobe dating and cooled at ~130 Ma as indicated by muscovite 40Ar/39Ar dating. In conjunction with previous structural and paleogeographic studies, the new data indicate that the Gangdese block underwent crustal thickening and associated exhumation during ~140-130 Ma. In this regard, the southern margin of Eurasia continent was comparable to the modern South American Altiplano-Puna plateau, the prime example of active ocean-continent subduction and associated thickened crust. Specifically, the early stages of crustal thickening and uplifting of the Gangdese block may result from subduction of the Neo-Tethyan Ocean. If the Tibetan Plateau would form by accretion of a series of blocks with thickened crust, an elevated topographic plateau similar to the Altiplano- Puna plateau had formed before collision between the Indian and Eurasian plates. Then the Tibetan Plateau would have quickly thickened, uplifted, and begun to extend soon after onset of the collision. Thus, the deformational mechanism of the Tibetan Plateau is not distributed shortening, but rather concentrating deformation within regions of thin crust between the accreted blocks.

关键词：地质学地壳增厚亚洲淡色花岗岩喜马拉雅山脉

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Monitoring Crustal Movement of the Coastal Zone in Eastern China with GPS Technique

引用

地球科学进展 2004年第S1期19卷 21-29页

作者： DING Ji-xin, YANG Zhi-fa, SHANG Yan-jun (institute of geology and {2., Chinese Academy of Sciences, beijing 10002., China)

In this paper, various dominating factors affecting crustal movement of the coastal zone in eastern China are analyzed, and major characteristics of crustal movement are summarized. Subduction of the pacific plate and Philippine plate and southeastward "escape" of Qinghai-Tibet plateau are believed to be dominating factors affecting crustal movement of that zone. Undoubtedly, it is a best way to monitor this kind of large-scale crustal movement with GPS technique. The feasibility of monitoring crustal m...

关键词： GPS Coastal zone Eastern China Crustal movement.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

S-wave velocity and Poisson's ratio structure of crust in Yunnan and its implication

引用

Science China Earth Sciences 2005年第2期48卷 210-218页

作者： HU Jiafu, SU Youjin, ZHU Xiongguan & CHEN Yun Geophysical Department of Yunnan University, Kunming 650091, China Seismological Bureau of Yunnan Province, Kunming 650041, China institute of geology and {2., Chinese Academy of Sciences, beijing 100101, China Geophysical Department of Yunnan University Kunming China Seismological Bureau of Yunnan Province Kunming China institute of geology and {2. Chinese Academy of Sciences Beijing China

Receiver function of body wave under the 2. stations in Yunnan was extracted from 3-component broadband digital recording of teleseismic event. Thus, the S-wave velocity structure and distribution characteristics of Poisson's ratio in crust of Yunnan are obtained by inversion. The results show that the crustal thickness is gradually thinned from north to south. The crustal thickness in Zhongdian of northwest reaches as many as 62.0 km and the one in Jinghong of further south end is only 30.2.km. What should be especially noted is that there exists a Moho upheaval running in NS in the Chuxiong region and a Moho concave is generally parallel to it in Dongchuan. In addition, there exists an obvious transversal inhomogeneity for the S-wave velocity structure in upper mantle and crust in the Yunnan region. The low velocity layer exists not only in 10.0-15.0 km in upper crust in some regions, but also in 30.0-40.0 km in lower crust. Generally, the Poisson's ratio is on the high side, however it has a better corresponding relation to the crustal velocity structure. An obvious block distribution feature is still shown on such a high background of Poisson's ratio. It is discovered by synthetically analyzing the velocity structure and Poisson's ratio distribution that there are high Poisson's ratio and complicated crust-mantle velocity structure feature in the Sichuan-Yunnan Diamond Block with Xiaojiang fault to be the east boundary and Yulong Snow Mountain fault to be the west boundary besides the frequent seismicity. This feature differs obviously from that of surrounding areas, which would provide geophysical evidence to deeply study the eastwardly flowage of lithospheric substances in the Qinghai-Tibet Plateau.

关键词： Yunnan, S-wave velocity, Poisson's ratio, Sichuan-Yunnan Diamond Block.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

东濮凹陷油气资源评价问题探讨

引用

石油学报 2003年第4期24卷 17-20,25页

作者：肖斌中国科学院地质与地球物理研究所北京100029

东濮凹陷是一个典型的盐湖沉积盆地 ,特殊的沉积特征决定了其油气资源评价方法的特殊性。根据东濮凹陷生油岩的高温、高压模拟试验资料 ,在一定的温压条件下 ,生油岩的液态窗可能会延长 ,使深部地层的油气资源 ,尤其是液态石油的资源供... 详细信息

东濮凹陷是一个典型的盐湖沉积盆地 ,特殊的沉积特征决定了其油气资源评价方法的特殊性。根据东濮凹陷生油岩的高温、高压模拟试验资料 ,在一定的温压条件下 ,生油岩的液态窗可能会延长 ,使深部地层的油气资源 ,尤其是液态石油的资源供给量增加。模拟试验资料还表明 ,在高温、高压条件下 ,生油岩的总生烃量会增加 ,其有机碳的转化率最高可达 41%。因此 ,用常规方法计算的资源量偏低 ,应重新测试在高温、高压条件下生油岩的产烃资源 ,准确计算东濮凹陷的资源量。

关键词：东濮凹陷盐湖沉积盆地烃源岩油气资源评价模型

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

LATE QUATERNARY VARIATION OF THE ARIDITY INDEX IN THE BADAIN JARAN DESERT,INNER MONGOLIA,CHINA─A DEDUCTION FROM LANDSCAPE EVOLUTIONS

引用

Scientia Geologica Sinica 2000年第2期 205-214页

作者： YANG Xiaoping (institute of geology and {2., Chinese Academy of Sciences beijing 10002.)

Palaeoclitalologists have faced for decades the challenge to obtain quantitative palaeoclimatic parameters for the arid and semiarid environrnent The landscape conception in the sense of climatic geomorphology can be used to bridge this gap. In the Badain Jaran Desert, geomorphological studies show that there are clear evidences for the shifting of morphodyndric zones. Comparing the former and present-day formation of landscapes indicates that the precipitation during the less arid periods was much larger than that of previously thought. This is confirmed by lake level changes both in the dune fields and in the marinal regions. Decreased aridity indexes of ca. 30 ka B.P. and 2. ka B.P. signal that the influence of westerlies on the arid region of northwestem China was presumably intensified at these times

关键词： der Wang A DEDUCTION FROM LANDSCAPE EVOLUTIONS LATE QUATERNARY VARIATION OF THE ARIDITY INDEX IN THE BADAIN JARAN DESERT,INNER MONGOLIA,CHINA

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

PRIMARY PROBLEMS ON THE RELATIONSHIP BETWEEN TECTONICS AND GLOBAL CLIMATE CHANGE

引用

Scientia Geologica Sinica 2000年第4期 367-374页

作者： Li Jiliang, wu Jun and Wang Yitian (institute of {2. and {2., Chinese Academy of Sciences, beijing, 10002.)

On the one hand, the global climate change occurred in Cenozoic, and its tendency was getting colder. During this period there were several abrupt changes. On the other hand, tectonic uplift existed in mountain and plateau areas in Cenozoic, and the total effect remain up to the present. A lot of evidence, macroscopic and microscopic, on climate, uplift and denudation over the world is commented to discuss the relationship between tectonics and global climate change. Geologists, geographers, geophysicists, geochemists and meteorologists should cooperate and work hard to solve this problem.

关键词： rock PRIMARY PROBLEMS ON THE RELATIONSHIP BETWEEN TECTONICS AND GLOBAL CLIMATE CHANGE rate

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

^(40)Ar/^(39)Ar chronology and geochemistry of high-K volcanic rocks in the Mangkang basin, Tibet

引用

Science China Earth Sciences 2005年第1期48卷 1-12页

作者： ZHANG Huihua, HE Huaiyu, WANG Jianghai & XIE Guanghong Guangzhou institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China institute of {2. and geophysics, Chinese Academy of Sciences, beijing 10002., China College of Life Sciences, Sun Yat-Sen University, Guangzhou 5102.5, China Chinese Academy of Sciences Guangzhou Institute of Geochemistry Guangzhou China Chinese Academy of Sciences Institute of Geology and Geophysics Beijing China College of Life Sciences Sun Yat-Sen University Guangzhou China

Our two newly obtained high-quality 40Ar/39Ar ages suggest that the high-K volcanic rocks of the Lawuxiang Formation in the Mangkang basin, Tibet were formed at 33.5 ( 0.2.Ma. The tracing of elemental and Pb-Sr-Nd isotopic geochemistry indicates that they were derived from an EM2.enriched mantle in continental subduction caused by transpression. Their evidently negative anomalies in HFSEs such as Nb and Ta make clear that there is an input of continental material into the mantle source. The high-K rocks at 33.5 ( 0.2.Ma in the Mangkang basin may temporally, spatially and compositionally compare with the early one of two-pulse high-K rocks in eastern Tibet distinguished by Wang J. H. Et al., implying that they were formed in the same tectonic setting.

关键词： Cenozoic high-K volcanic rocks, 40Ar/39Ar chronology, Mangkang basin, Tibet.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：