Palaeomagnetic evidence for southward displacement of the Chuan Dian fragment of the Yangtze Block   总被引：5，自引：0，他引：5  

Masato Tamai  Yuyan Liu  Lian Zhong Lu  Masahiko Yokoyama  Nadir Halim  Haider Zaman  Yo-ichiro Otofuji 《Geophysical Journal International》2004,158(1):297-309

  相似文献   

Tectonic elements with South China affinity in the Korean Peninsula: new Early Jurassic palaeomagnetic data   总被引：1，自引：0，他引：1  

Koji Uno  Tae Woo Chang  Kuniyuki Furukawa 《Geophysical Journal International》2004,158(2):446-456

  相似文献   

Origin of the salt valleys in the Canyonlands section of the Colorado Plateau: Evaporite-dissolution collapse versus tectonic subsidence     

F. Gutirrez 《Geomorphology》2004,57(3-4):423-435

The salt valleys over the axis of the salt-cored anticlines in the Paradox fold and fault belt (Canyonlands, Utah and Colorado) are created by subsidence of the anticline crests. Traditionally, the collapse of the anticlinal crests was attributed to dissolution of the salt walls (diapirs) forming the anticline cores. Recent studies based on scaled physical models and field observations propose that the salt valleys are a result of regional extension and that salt dissolution had only a minor influence in the development of the axial depressions. This paper presents several arguments and lines of evidence that refute the tectonic model and support the salt dissolution subsidence interpretation.The development of contractional structures in salt dissolution experiments led the advocates of the tectonic interpretation to reject the dissolution-induced subsidence explanation. However, these salt dissolution models do not reproduce the karstification of salt walls in a realistic way, since their analog involves removal of salt from the base of the diapirs during the experiments. Additionally, numerous field examples and laboratory models conducted by other authors indicate that brittle subsidence in karst settings is commonly controlled by subvertical gravity faults.Field evidence against the regional extension model includes (1) a thick cap rock at the top of the salt walls, (2) the concentration of subsidence deformation structures along the crest of the anticlines (salt walls), (3) deformational structures not consistent with the proposed NNE extension, like crestal synforms and NE–SW grabens, (4) dissolution-induced subsidence structures controlled by ring faulting, revealing deep-seated dissolution, (5) large blocks foundered several hundred meters into the salt wall, (6) evidence of recent and active dissolution subsidence, and (7) the aseismic nature of the recently active collapse faults. Although underground salt dissolution seems to be the main cause for the generation of the salt valleys, this phenomenon may have been favored by regional extension tectonics that enhance the circulation of groundwater and salt dissolution.  相似文献   

Holocene-emerged notches and tectonic uplift along the Jalisco coast, Southwest Mexico     

M. Teresa Ramírez-Herrera  Vladimir Kostoglodov  Jaime Urrutia-Fucugauchi 《Geomorphology》2004,58(1-4):291-304

This paper presents the preliminary results from a study of Holocene-emerged shorelines, marine notches, and their tectonic implications along the Jalisco coast. The Pacific coast of Jalisco, SW Mexico, is an active tectonic margin. This coast has been the site of two of the largest earthquakes to occur in Mexico this century: the 1932 (Mw 8.2) Jalisco earthquake and the 1995 (Mw 8.0) Colima earthquake. Measurement and preliminary radiocarbon dating of emergent paleoshorelines along the Jalisco coast provide the first constraints upon the timing for tectonic uplift. Along this coastline, uplifted Holocene marine notches and wave-cut platforms occur at elevations ranging from ca. 1 to 4.5 m amsl. In situ intertidal organisms dated with radiocarbon, the first ever reported for the Jalisco area, provide preliminary results that record tectonic uplift during at least the past 1300 years BP at an average rate of about 3 mm/year. We propose a model in which coseismic subsidence produced by offshore earthquakes is rapidly recovered during the postseismic and interseismic periods. The long-term period is characterized by slow tectonic uplift of the Jalisco coast. We found no evidence of coastal interseismic and long-term subsidence along the Jalisco coast.  相似文献   

Characteristics of Energy Accumulation and Release of Seismogenic Tectonics and Seismic Risk Analysis in Some Areas in the Tianshan Mountains, Xinjiang1     

Shen Jun 《中国地震研究》2005,19(1):1-11

INTRODUCTIONHowtocombinethestudyofseismogenictectonicswithearthquakepredictionisanurgentscientificdifficulty .Thereexistbiggapsbetweenstudymethodsandcurrentknowledgeonseismogenitectonics ,earthquakeprediction ,seismogenesisandthephysicsofearthquakeoccurre…  相似文献   

Numerical Modeling of Basin-Range Tectonics Related to Continent-Continent Collision   总被引：1，自引：0，他引：1  

CUI Junwen  SHI Jinsong  LI Pengwu  ZHANG Xiaowei  GUO Xianpu  DING Xiaozhong Institute of Geology  Chinese Academy of Geological Sciences  Beijing  Hehai University  Nanjing  Jiangsu 《《地质学报》英文版》2005,79(1):24-35

Continent-continent collision is the most important driving mechanism for the occurrence of various geological processes in the continental lithosphere. How to recognize and determine continent-continent collision,especially its four-dimensional temporal-spatial evolution, is a subject that geological communities have long been concerned about and studied. Continent-continent collision is mainly manifested by strong underthrnsting (subduction) of the underlying block along an intracontinental subduction zone and continuous obduction (thrusting propagation) of the overlying block along the intracontinental subduction zone, the occurrence of a basin-range tectonic framework in a direction perpendicular to the subduction zone and the flexure and disruption of the Moho. On the basis of numerical modeling, the authors discuss in detail the couplings between various amounts and rates of displacement caused by basin subsidence, mountain uplift and Moho updoming and downflexure during obduction (thrusting propagation) and subduction and the migration pattern of basin centers. They are probably indications or criteria for judgment or determination of continent-continent collision.  相似文献   

Estimate of differential stress in the upper crust from variations in topography and strike along the San Andreas fault   总被引：3，自引：0，他引：3  

Yuri Fialko  Luis Rivera  Hiroo Kanamori 《Geophysical Journal International》2005,160(2):527-532

  相似文献   

Moment release in the Lower Rhine Embayment, Germany: seismological perspective of the deformation process     

J. Schmedes  S. Hainzl  S.-K. Reamer  F. Scherbaum  K.-G. Hinzen 《Geophysical Journal International》2005,160(3):901-909

  相似文献   

Response of active tectonics on the alluvial Baghmati River, Himalayan foreland basin, eastern India   总被引：1，自引：2，他引：1  

Vikrant Jain  R. Sinha 《Geomorphology》2005,70(3-4):339

Active tectonics in a basin plays an important role in controlling a fluvial system through the change in channel slope. The Baghmati, an anabranching, foothills-fed river system, draining the plains of north Bihar in eastern India has responded to ongoing tectonic deformation in the basin. The relatively flat alluvial plains are traversed by several active subsurface faults, which divide the area in four tectonic blocks. Each tectonic block is characterized by association of fluvial anomalies viz. compressed meanders, knick point in longitudinal profiles, channel incision, anomalous sinuosity variations, sudden change in river flow direction, river flow against the local gradient and distribution of overbank flooding, lakes, and waterlogged area. Such fluvial anomalies have been identified on the repetitive satellite images and maps and interpreted through DEM and field observations to understand the nature of vertical movements in the area. The sub-surface faults in the Baghmati plains cut across the river channel and also run parallel which have allowed us to observe the effects of longitudinal and lateral tilting manifested in avulsions and morphological changes.  相似文献   

Mantle tectonics beneath New Zealand inferred from SKS splitting and petrophysics   总被引：1，自引：0，他引：1  

Mathieu Duclos  Martha K. Savage  réa Tommasi  Ken R. Gledhill 《Geophysical Journal International》2005,163(2):760-774

  相似文献