Advances in Earth Science ›› 2002, Vol. 17 ›› Issue (1): 85-90. doi: 10.11867/j.issn.1001-8166.2002.01.0085

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THE INDICATION OF CONTINENTAL DETRITAL SEDIMENT TO TECTONIC SETTING

YAN Yi,  LIN Ge, WANG Yuejun, GUO Feng   

  1. Changsha Institute of Geotectonics, Chinese Academy of Sciences, Changsha  410013, China
  • Received:2001-03-30 Revised:2001-06-08 Online:2002-12-20 Published:2002-02-01

YAN Yi,LIN Ge,WANG Yuejun,GUO Feng. THE INDICATION OF CONTINENTAL DETRITAL SEDIMENT TO TECTONIC SETTING[J]. Advances in Earth Science, 2002, 17(1): 85-90.

As the product of mountain uplift-erosion, basin detrital sediment include abundant important information about source rock types and its tectonic setting, so basin continental detrital sediment is a very important indicator to the tectonic setting of sediment source. At present, there are many methods using basin detrital sediment to trace source and inverse its tectonic setting,such as detrital composition analysis method, geochemistry analysis method and isotopic chronology analysis method. Through examples, the progress and limitations of these methods are introduced. Basin detrital composition analysis and geochemistry analysis are the most fundamental methods to trace source and inverse its tectonic setting and have made great progresses, but detrital composition analysis, assemblage of accessory mineral and geochemistry analysis can only provide material composition information about sediment source. Because of the influence of provenance diversity, the different contribution of different provenance and the differentiation in the transportation process, so it is very difficult to trace source precisely only through these methods. While isotopic chronology analysis can provide chronology information about sediment source, different isotopic chronology analysis methods, such as K-Ar,Rb-Sr,Sm-Nd method, have been used in many areas and made very good results. These methods have their own priority in monitoring source denudation rate and tectonic-thermal events, but they are also often influenced by provenance diversity.  Zircon U-Pb method can solve the problem very well, different zircons coming from different sources can be separated through single-grain dating. Zircon U-Pb method can provide the information about zircon formation in igneous or high grade metamorphic environments, and FT method can provide the low-temperature information that record the thermo-tectonic evolution of sediment source. Such information is central to understanding the temporal relationships between sediment source and sedimentation in adjacent basins. So combination of zircon U-Pb and FT dating can extract the optimum amount of sediment source information. Through basin detrital sediment to trace source and inverse its tectonic setting has very important scientific significance, it can provide new ways to basin-mountain coupling research,but it is also a very complex problem including much knowledge about sedimentology, geochemistry and tectonics. According to the different tectonic setting of different regions, selecting several methods to make a comprehensive analysis will be a better way.

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