Re-determination on the Sedimentary Age of Salawusu Formation

Su Zhizhu; Dong Guangrong

The Salawusu River area is one of the standard sections of the Late Pleistocene strata in North Chi-na.However, there have been a lot of different views about the strata since the establishment of alawusu Formation, especially in the aspects of sedimentary facies, stratigraphic data and its climate sig-nificance.According to the stratigraphic subdivision, age dating and the analysis of the sedimentary fa-cies, the following recognitions can be gained: 1 The original Salawusu Formation could be further divided into Lishi Loess interbeded with sandysediments(Q²2 ), Salawusuu Formation(Q,¹3 ), Cheng-chuan Formation(Q^2,3 ), Dagouwan Formation (Q4 )and Dishaogouwan Formation(Q³4 ).2 Salwusu Formation is mainly a fluvial-lacustrine deposit corresponding to the Stage 5 of deep seainδ¹⁸O and formed between about 140- 70 Ka.BP.Chengchuan Formation is mainly fossil aeolian sands,with some lacustrine silty-clay in the middle part, correspording to Stages 2- 4 of deep sea inδ¹⁸O andformed between 70- 10 Ka.BP.Dagouwan Formation is lacustrine sediments and black-paleosoil, indi-cating the warm-humid climate and formed in the middle-early period of Holocene.Dishaogouwan For-mation is mainly sub-loess and aeolian sands, representing the cold-dry climate and being believed to be-long to the late Holocene.3 As a fluvial-lacustrine sedimentary stratum, Salawusu Formation is quite different from its upperChengchuan Formation both in geochronology, lithology and sedimentary facies and in palaeontology.Chengchuan Formation and Malan Loess belong to heteropic deposits(sandy and loessic facies) formedcontemporaneously under the same wind action.4 As a flurial-lacustrine-aeolian-sand sequence by observing the Dishaogou profile in the SalawusuRiver area,its climatic records can compete with the records of loess and deep sea deposits, they may bedivided into 5 climatic periods just by oxygen isotope.It is suggested that the climatic change of this re-gion during the last interglacial period is synchronous withthat of the whole earth.

Re-determination on the Sedimentary Age of Salawusu Formation

1 Institute of Loess Plateau Geography,Shanxi University,Taiyuan 030006;

2 Institute of Desert Research,Academia Sinica,Lanzhou 730000

Received Date: 1996-09-24

Publish Date: 1997-12-10

Key words:

Abstract: The Salawusu River area is one of the standard sections of the Late Pleistocene strata in North Chi-na.However, there have been a lot of different views about the strata since the establishment of alawusu Formation, especially in the aspects of sedimentary facies, stratigraphic data and its climate sig-nificance.According to the stratigraphic subdivision, age dating and the analysis of the sedimentary fa-cies, the following recognitions can be gained: 1 The original Salawusu Formation could be further divided into Lishi Loess interbeded with sandysediments(Q²2 ), Salawusuu Formation(Q,¹3 ), Cheng-chuan Formation(Q^2,3 ), Dagouwan Formation (Q4 )and Dishaogouwan Formation(Q³4 ).2 Salwusu Formation is mainly a fluvial-lacustrine deposit corresponding to the Stage 5 of deep seainδ¹⁸O and formed between about 140- 70 Ka.BP.Chengchuan Formation is mainly fossil aeolian sands,with some lacustrine silty-clay in the middle part, correspording to Stages 2- 4 of deep sea inδ¹⁸O andformed between 70- 10 Ka.BP.Dagouwan Formation is lacustrine sediments and black-paleosoil, indi-cating the warm-humid climate and formed in the middle-early period of Holocene.Dishaogouwan For-mation is mainly sub-loess and aeolian sands, representing the cold-dry climate and being believed to be-long to the late Holocene.3 As a fluvial-lacustrine sedimentary stratum, Salawusu Formation is quite different from its upperChengchuan Formation both in geochronology, lithology and sedimentary facies and in palaeontology.Chengchuan Formation and Malan Loess belong to heteropic deposits(sandy and loessic facies) formedcontemporaneously under the same wind action.4 As a flurial-lacustrine-aeolian-sand sequence by observing the Dishaogou profile in the SalawusuRiver area,its climatic records can compete with the records of loess and deep sea deposits, they may bedivided into 5 climatic periods just by oxygen isotope.It is suggested that the climatic change of this re-gion during the last interglacial period is synchronous withthat of the whole earth.

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Reference (1)

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Re-determination on the Sedimentary Age of Salawusu Formation

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