Extraction of Grain-size Components with Environmentally Sensitivity of Aeolian Sediments in Eastern Shore of Qinghai Lake and Their Palaeoclimatic Implications

doi:10.7522/j.issn.1000-694X.2016.00070

JOURNAL OF DESERT RESEARCH ›› 2017, Vol. 37 ›› Issue (5): 878-884.DOI: 10.7522/j.issn.1000-694X.2016.00070

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Extraction of Grain-size Components with Environmentally Sensitivity of Aeolian Sediments in Eastern Shore of Qinghai Lake and Their Palaeoclimatic Implications

Li Tengfei, Li Jinfeng, Lu Ruijie, Liu Xiaokang, Chen Lu

State Key Laboratory of Earth Surface Processes and Resource Ecology/MOE Engineering Center of Desertification and Blown-sand Control/Faculty of Geographical Science, Beijing 100875, China

Received:2016-03-29 Revised:2016-05-24 Online:2017-09-20 Published:2017-09-20

Abstract

Abstract: Graded-standard deviation can be used to extract the sensitive grain-size component in sedimentary sequences. In this paper, multiple aeolian sand/paleosol sedimentary sections in eastern Qinghai Lake were analyzed by this method. The results showed that division had an influence on sensitive components extraction result. The coarse sensitive components had larger standard deviation value than fine-grained components extracted by the logarithmic graded-standard deviation, while using linear graded-standard deviation, the extracted fine grained components were more sensitive to environmental changes; Fine grain sensitive component extracted by two methods had a great difference, and coarse grain were relatively consistent, suggesting that graded. When using graded standard deviation method to extract environmental sensitive components, both methods could extract coarse sensitive components effectively, meanwhile linear graded-standard deviation could obtain better effect in extracting fine grained sensitive components. With the method of linear graded-standard deviation, we found that the clay fraction (0-4 μm) can be used as a proxy of summer monsoon, while medium and fine sand fraction (144-321 μm) should be used for indicating the strength of aeolian activity, and very fine sand component (60-126 μm) may be influenced by local terrain, its paleoclimatic significance remains to be further identified.

Key words: Qinghai Lake, grain size, paleoclimate, aeolian activity

CLC Number:

P931.3

Li Tengfei, Li Jinfeng, Lu Ruijie, Liu Xiaokang, Chen Lu. Extraction of Grain-size Components with Environmentally Sensitivity of Aeolian Sediments in Eastern Shore of Qinghai Lake and Their Palaeoclimatic Implications[J]. JOURNAL OF DESERT RESEARCH, 2017, 37(5): 878-884.

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Extraction of Grain-size Components with Environmentally Sensitivity of Aeolian Sediments in Eastern Shore of Qinghai Lake and Their Palaeoclimatic Implications

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