NIE FengJun, JIANG MeiZhu, WU HeYong, LIU WenLong. Estimates of Physical Parameters in Sedimentary Environments by Means of Ancient Ripple Marks--Case of Changchengian quartz sandstones in Xuanhua Area, Northwest Hebei[J]. Acta Sedimentologica Sinica, 2002, 20(2): 255-260.
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NIE FengJun, JIANG MeiZhu, WU HeYong, LIU WenLong. Estimates of Physical Parameters in Sedimentary Environments by Means of Ancient Ripple Marks--Case of Changchengian quartz sandstones in Xuanhua Area, Northwest Hebei[J]. Acta Sedimentologica Sinica, 2002, 20(2): 255-260.
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Estimates of Physical Parameters in Sedimentary Environments by Means of Ancient Ripple Marks--Case of Changchengian quartz sandstones in Xuanhua Area, Northwest Hebei
- 1.
East China Geological lnstit ute,Linchuan Jiangxi 344000;
- 2.
Research lnstit ute of Exploration development,daIing Heilongjiang 163712;
- 3.
China University of Geosciences,Wuhan,Hubei 430074;
- 4.
China University of Geosciences,Wuhan,Hubei 430074
- Received Date: 2001-03-22
- Rev Recd Date:
2001-07-11
- Publish Date:
2002-04-10
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Abstract
Since the 1970~s, sedimentology has entered into a quantitative study era. The Europe an sedimentologist creatively did a lot of quantitative study on ancient ripple marks in the marine sediments in Alps and lacustrine sediments in Shedland of England in the 1980s. A series of mathematical formulae have been established. A number of physical parameters of sedimentary environments of Changchengian quartz sandstones A, B, and C in the Xuanhua area, northwest Hebei are estimated based on the mathematical formula in this study. The calculation results show the velocities of water particles of sedimentary environments from sandstones A via B to C becom smaller, then bigger; the motion periods for water particles become shorter, then longer; the water depths of environments become shallower, then deeper; the wave heights of waters become lower, then higher; the energy of waters becomes smaller, then larger. These estimations are in fair harmony with the observations in the field. The grain size analyses demonstrate the jumping population of sandstones dominated in sedimentary environments and the suspension population at 20～40% of the total grains. No tractive population is present in the analyzed samples. So,the grains are transport in the form of jumping and suspension. in shallower water bodies.
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