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Diagenesis,facies and palaeocurrent analysis of Upper Rewa Sandstone around Sagar,Central India

Journal of Palaeogeography 2023年第4期12卷 546-563页

作者： Gaurav K.Singh Ashish K.Rai Arvind K.Singh Department of Applied Geology Dr.Harisingh Gour VishwavidyalayaSagar 470003Madhya PradeshIndia Geological Survey of India ShillongIndia

The stratigraphic surface represented by a major contact between the Archean Bundelkhand Granite and the extensive Proterozoic Vindhyan sediments is a regional basement cover unconformity.This crystalline—sedimentary interface reflects an intense weathering of continental crust during marine transgression.Three time-transgressive sand deposition events viz.Kaimur,Rewa and Bhander are mainly witnessed during the entire Vindhyan sedimentation.Stratigraphically,the Upper Rewa Sandstone comprises one of these events in the Vindhyan Basin.Considerable progress has been made in interpreting these sandstones as a function of entirely marine process to a combination of tidal—fluvio—eolian activities.All the results have so far been attained on the basis of sedimentary facies,provenance,palaeocurrent analysis,and some of petrography.A distinct differentiation between marine and fluvial components of the Upper Rewa Sandstone still remains uncertain.Here,we use diagenesis as a parameter for the first time along with facies and palaeocurrent analysis to acquire a clear comprehension of marine-and fluvial-dominated processes.The present study spans 27 square kilometer area covering 15 stratigraphic sections with a collection of 571directional data from the facies specific sedimentary structures,and 28 samples obtained for the thin section analysis.The lower unit of the Upper Rewa Sandstone shows facies association typical of tidal environment,along with polymodal palaeocurrent.These rocks are well sorted and dominantly lithified by authigenic cement.Profuse development of a complex of syntaxial,passive pore fills,and grain replacive cements reflect normally pressured nature of the lower unit sandstones.The upper unit of the Upper Rewa Sandstone however,reveals a facies pattern resembling fluvial processes and unimodal palaeocurrent plot.They exhibit poor sorting,siliceous,and ferruginous matrix,and development of intense stylolites.Since,pressure solution is a dominant mode of lithification;the upper unit rocks therefore,are

关键词： palaeocurrent Diagenesis Facies Upper Rewa Sandstone Vindhyan Basin

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MEASUREMENT OF SHAPE AND ORIENTATION OF SAND GRAIN ELLIPSOID——THE APPLICATION IN THE PHASE ANALYSIS OF XIANGSHAN GROUP IN NANJING

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Chinese Science Bulletin 1992年第13期37卷 1104-1107页

作者：关平张磊 Department of Geology Peking University Beijing 100871 PRC General Research Institute of Nonferrous Metal Beijing 100088 PRC

The measurement and analysis of the texture of sandstone can provide a lot of information and the basis for the palaeocurrent analysis, basin analysis and palaeoenvironmental reconstruction. Sedimentationists have done a lot of researches in this field and proposed many theories and methods in the measurement of texture. But these methods are not satisfactory.

关键词： sandstone texture palaeocurrent analysis quantitative calculation

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