Influence of fluvial‐tidal interactions on the nature of cross‐stratified packages in a deltaic setting: examples from the Barakar Coal Measure (Permian), Satpura Gondwana Basin,central India     

Sanjoy Kumar Ghosh  Chandan Chakraborty  Tapan Chakraborty 《Geological Journal》2005,40(1):65-81

Nine different types of cross‐stratified packages from the coal‐bearing, deltaic succession of the Barakar Formation (Permian) of the Satpura Gondwana Basin, central India, are described. The deposits are characterized by periodic mudstone drapes, reactivation surfaces including all other features suggestive of deposition from periodically unsteady, tidally‐influenced flows. The inferred flow patterns varied from purely bidirectional to pulsating unidirectional. The different types of cross‐stratified packages are interpreted to have resulted from superimposition of ebb‐oriented, steady, unidirectional fluvial currents of variable strength on the tidal flow in a deltaic setting. The study helps to distinguish cross‐strata that may develop in settings where fluvial and tidal currents interact. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   

Climate drift of AMOC,North Atlantic salinity and arctic sea ice in CFSv2 decadal predictions     

Bohua Huang  Jieshun Zhu  Lawrence Marx  Xingren Wu  Arun Kumar  Zeng-Zhen Hu  Magdalena A. Balmaseda  Shaoqing Zhang  Jian Lu  Edwin K. Schneider  James L. Kinter III 《Climate Dynamics》2015,44(1-2):559-583

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Impacts of land–atmosphere coupling on regional rainfall and convection     

Yue Zheng  Anil Kumar  Dev Niyogi 《Climate Dynamics》2015,44(9-10):2383-2409

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Effects of complex interaction of Rayleigh waves with tunnel on the free surface ground motion and the strain across the tunnel-lining     

J. P. Narayan  D. Kumar  D. Sahar 《Natural Hazards》2015,77(1):479-495

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Time-dependent seismicity analysis in the Northwest Himalaya and its adjoining regions     

P. Chingtham  R. B. S. Yadav  S. Chopra  Arabind Kumar Yadav  A. K. Gupta  P. N. S. Roy 《Natural Hazards》2016,80(3):1783-1800

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Active and break events of Indian summer monsoon during 1901–2014     

D. S. Pai  Latha Sridhar  M. R. Ramesh Kumar 《Climate Dynamics》2016,46(11-12):3921-3939

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Detrital zircon U–Pb geochronology of a Cenozoic foreland basin in Northeast India: Implications for zircon provenance during the collision of the Indian and Asian plates     

Upendra Baral  Ding Lin  Tapos Kumar Goswami  Mondip Sarma  Muhammad Qasim  Devojit Bezbaruah 《地学学报》2019,31(1):18-27

Geochronology is useful for understanding provenance, and while it has been applied to the central and western Himalaya, very little data are available in the eastern Himalaya. This study presents detrital zircon U–Pb ages from the late Palaeocene–Eocene Yinkiong Group in NE India. The samples are from the late Palaeocene to early Eocene Lower Yinkiong Formation, and the Upper Yinkiong Formation deposited during the early to mid‐Eocene within the Himalayan foreland basin. The U–Pb ages of the detrital zircon within the Lower Yinkiong Formation are older than late Palaeozoic, with a cratonic and early Himalayan Thrust Belt affinity, whereas the Cenozoic grains in the Upper Yinkiong Formation indicate a Himalayan Thrust Belt source and possibly a granitic body within the Asian plate. The shift of the sources and the changes in the foreland basin system strongly suggest that the India–Asia collision in the Eastern Himalaya began before or immediately after the deposition of the Upper Yinkiong Formation, i.e., within the early Eocene (c. 56 to 50 Ma).  相似文献   

Stability analysis of multi-directional anchored rock slope subjected to surcharge and seismic loads     

Sanjay Kumar Shukla  Md. Monir Hossain 《Soil Dynamics and Earthquake Engineering》2011,31(5-6):841-844

More than one set of anchors with different orientations can be an economical solution to completely stabilize the rock slope. In this note, a general analytical expression for the factor of safety of a multi-directional anchored rock slope (MDARS) against plane failure is derived, incorporating most of the practically occurring destabilizing forces under surcharge and seismic loading conditions. Several special cases of this expression are found to be similar to those reported in the literature. A graphical presentation shows that for any specific inclination of one set of anchors to the normal at failure plane, the variation in the inclination of the second set of anchors to the normal at failure plane, when greater than approximately 60°, does not cause a significant change in the factor of safety of the MDARS.  相似文献   

Assessment of ecological disturbance in the mangrove forest of Sundarbans caused by cyclones using MODIS time-series data (2001–2011)     

Dibyendu Dutta  Prabir Kumar Das  Soubhik Paul  Jaswant Raj Sharma  Vinay Kumar Dadhwal 《Natural Hazards》2015,79(2):775-790

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The M w 6.9 Sikkim–Nepal earthquake of September 2011: a perspective for wrench faulting in the Himalayan thrust zone     

N. Purnachandra Rao  V. M. Tiwari  M. Ravi Kumar  Pinki Hazarika  Dipankar Saikia  R. K. Chadha  Y. J. Bhaskar Rao 《Natural Hazards》2015,77(1):355-366

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