| In simian,there is a lot of stromatolites in the tarim basin.This article uses some methods to study,just like we observed these stones in the field,and analyzed in the laboratory,in addition,I have analyzed the characteristics of stromatolite,the sedimentary environment the evolution of these place in the area.and I research the stromatolite,from another new ways,to explore the evolution of sedimentary environment of the area.The study area is located in the northwestern margin of the tarim basin between the aksu,WuShen,keping,I fouced on the mainly studied of the three section in the study area.Because of the different of the depositional environment of these stromatolites,there are four major categories,these include different types of stromatolites in 11,for example: Paniscolleniar;Conophyton;Paniscollenia;Collenia;Nucleella;Vetella;stratifera;Linocollenia;Linocollenia;Baicalia;colonnella and so on.This paper makes a few conclusions based on the observation of the field,and the analysis in the laboratory,and the analysis of the lateral and longitudinal comparison between the three sections.Longitudinal contrast analysis observed the findings: The sea level is shallow and deep near the WuShen section,and then,the water gets deep and shallow,finally,it gets deep again;In the north,the sea level is a process of becoming shallow,and then,it gets deep,finally,it gets shallow again;To the south,the sea level is higher and keep a stable level in a long time,and basically it stays in the intertidal zone-the transition process.Horizontal contrast analysis observed the findings: In early Sinian,On the northwest edge of the tarim basin,the sea level of this place is getting shallower from the southwest side to the northeast side.In middle sinian,the depth of the sea is roughly the same,and basically it stays in the intertidal zone-the transition process.In late sinian,the sea level is a gradually shallow from north to south.The WuShen section is under the tidal zone. |
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