检索结果-南通市图书馆

Journal of China University of Geosciences 2009年第4期20卷 699-708页

作者：杨风丽于海啸张青林李前裕 State Key Laboratory of Marine Geology Tongji University Shenzhen Oil Company CNOOC

Late Miocene shortening rate, uplift rate, and inversion rate in the central inversion zone of the Xihu （西湖） depression, East China Sea basin, were independently determined from a large number of 2D reflection seismic data and methods. Shortening rate was estimated from the 2DMOVE balanced cross-section technology, uplift rate was calculated after absolute erosions were determined from seismic data during the uplifting time, and inversion rate was measured using the improved calculation method by Song （1997）. The cross correlations among shortening rate, uplift rate, and inversion rate show a good positive relationship, with some differences existing in local areas. This article analyzes the cross correlation between these structural rates and discusses the dynamics of mechanisms for basin inversion and their influence on hydrocarbon accumulation.

关键词： basin inversion shortening rate uplift rate inversion rate cross correlation Xihu depression East China Sea basin.

FISSION TRACK AGES AND uplift rateS OF THE SOUTH XIZANG (TIBET) REGION

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 1988年第8期 971-983页

作者：刘顺生张峰 Academia Sinica Changsha Insticute of Geoeronics Academia Sinica. Academia Sinica Guiyang Institute of Geochemistry

The geological ages of Lhasa, Kangmar and Gaowu rock bodies of Xizang (Tibet) have been determined by fission track method. The results are: 25.5—27.2, 10.7—11.5, 8.06—9.19 Ma respectively. It is found that the fission track (FT) age of apatite increases with the elevation of sample. Calculated by the ages-topographic altitude method, the uplift rates of the above three rock bodies are 0.25, 0.45, and 0.49 mm/a respectively. On the basis of the fission track age and the published isotopic age data, the uplift rates of other regions have been calculated by the mineral pair-blocking temperatures method. The lowest is 0.08 mm/a and the highest 2.4 mm/a. We found that the uplift rates of different regions in the same period are distinet, and the uplift rates of different geological times in the same region also are not alike. This situation shows that the Xizang region has a complex geological and unroofing history due to the collision of the India and Eurasian plates.

关键词： fission traek age uplift rate Xizang (Tibet).

Drainage Network and Lineament Analysis:An Approach for Potwar Plateau(Northern Pakistan)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Mountain Science 2009年第1期6卷 14-24页

作者： Faisal SHAHZAD Syed Amer MAHMOOD Richard GLOAGUEN Remote Sensing Group Institute of GeologyFreiberg University of Mining and TechnologyFreiberg09599Germany.

Drainage responds rapidly to tectonic changes and thus it is a potential parameter for teetonogeomorphological analysis. Drainage network of Potwar is a good geological record of movement, displacements, regional uplifts and erosion of the tectonic units. This study focuses on utilizing drainage network extracted from Shuttle Radar Digital Elevation Data （SRTM-DEM） in order to constrain the structure of the Potwar Plateau. SWAN syncline divides Potwar into northern Potwar deformed zone （NPDZ） and southern Potwar platform zone （SPPZ）. We extracted the drainage network from DEM and analyzed 112 streams using stream power law. Spatial distribution of concavity and steepness indices were used to prepare uplift rate map for the area. DEM was further utilized to extract lineaments to study the mutual relationship between lineaments and drainage patterns. We compared the local correlation between the extracted lineaments and drainage network of the area that gives us quantitative information and shows promising prospects. The streams in the NPDZ indicate high steepness values as compared to the streams in the SPPZ. The spatial distribution of geomorphic parameters distinctive deformation and uplift rates suggest the among eastern, central and western parts. The local correlation between drainage network and lineaments from DEM is strongly positive in the area within I km of radius.

关键词： Drainage network lineaments streamprofile analysis uplift rate local correlation

Application of River Longitudinal Profile Morphometrics to Reveal the uplift of Lushan Mountain

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2017年第5期91卷 1644-1652页

作者： HAN Zhiyong LI Xusheng WANG Nairui CHEN Gang WANG Xianyan LU Huayu School of Geographic and Oceanographic Sciences Nanjing University Nanjing 210023 China Nanjing Hydraulic Research Institute Nanjing 210029 China

The stream power model was applied to Lushan Mt. in South China in order to verify its capability of interpreting the uplift of a small block mountain. On a log-log plot, the longitudinal profiles of 9 rivers derived from a 30 m DEM exhibit primary characteristics similar to those derived from a 5 m DEM; however, the 5 m DEM clearly reveals more minor knickpoints, and the positions of knickpoints are pinpointed more accurately. All of the studied rivers on the block mountain are in a transient state due to geological perturbations. Some of them exhibit two segments in steady state separated by a slopebreak knickpoint. Such rivers generally develop in a longitudinal valley, which are less perturbed by substrate inhomogeneities. The similar heights of the slope-break knickpoints and the similar uplift rate indicated by the k_（sn） values demonstrate an almost simultaneous headward erosion induced by the fall in base level. This modelling result is consistent with the mode of formation of this particular block mountain. Our study demonstrates that the stream power model is applicable to a small tectonicallyactive massif only if the channel segments are in a steady state.

关键词： knickpoint river longitudinal profile normalized steepness index uplift rate

Investigation of Terraces along the Luoyunshan Piedmont Fault Zone and Its Tectonic Implications

在线全文

学校读者我要写书评

暂无评论

Earthquake Research in China 2012年第2期26卷 210-221页

作者： Sun Changbin Xie Xinsheng Xu Jianhong Laboratory of Crustal Dynamics Institute of Crustal Dynamics CEA Beijing 100085 China

Located at the west of the Linfen basin, the Luoyunshan piedmont fault zone controls the western boundary of the basin. According to the measurements of the terraces in eight gullies along the Luoyunshan fault zone, five levels of terraces, namely T1～T5 have developed in these gullies. The heights of terraces T1, T2, T3, T4 and T5 are about 3m, 8～10m, about 20m, about 30m and 40～50m, respectively. The dating data of the terraces and investigation of the faulted landforms show that the Luoyunshan fault zone has experienced much activity since the Late Quaternary. The uplift rate of the terraces was 0.41mm/a since the Middle-Late Pleistocene, and 0.75mm/a since the Holocene. The increasing trend of uplift rate of the terraces along the Luoyunshan fault zone from the Middle-Late Pleistocene to Holocene indicates the tendency of gradual tectonic uplift of the fault zone since the late Quaternary. This is in good agreement with the increasing trend of subsidence rate of the Linfen basin from the Late Pleistocene to Holocene.

关键词： Luoyunshan piedmont fault zone Terrace Late Quaternary uplift rate Tectonic implication

Fission track age of granite batholith from Southern Tibet:implications for the plateau uplift

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2003年第8期 74-78页

作者： ZHAO Zhidan, MO Xuanxue, GUO Tieying, ZHANG Shuangquan, ZHOU Su, DONG Guochen, WANG Liangliang, ZHANG Fengqin and WAN Jinglin (1. China University of Geosciences, Beijing 100083, China 2. Institute of Geology, China Seismological Bureau, Beijing 100029, China)

Fission track （FT） ages of apatite and zircon from four granite batholiths from Lhasa and Shannan areas are *** FT ages of apatite range from 3.2±8.3 Ma, corresponding to the uplift rates of 0.12±0.20 mm·a-1during this period. The upliftheight is 580m, showing that there is not large-scale rapid uplifting in southern Tibet from 3.2 to 8.3 Ma. The zircon FT ages of Lhasabatholith are 25.9±1.7 and 32.7±2.8 Ma, yielding an uplift rate of 0.08 mm·a-1between 26 and 33 Ma. Combining this work withother studies, it is suggested that the average uplift rate in southern Tibet is low from the time of collision between India and Asian conti-nents to ～3Ma. The uplift of Tibetan Plateau seems to have finished in multi-stage processes with varied rates.

关键词： fission track age uplift rate Lhasa Tibet.

Dating of faults and estimation of surface uplift and erosion rates in the northern margin of Dabie Mountains,China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Dating of faults and estimation of surface uplift and erosio...