Study on the Characters of the Geochemical Elements and Changes of Paleoclimate since about 9.0cal kaBP in Lake Barkol，Xinjinag
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摘要: 根据中国西北干旱区巴里坤湖BLK-1剖面沉积物的地化元素分析，采用SPSS因子分析法提取了对沉积环境变化敏感的地化元素和氧化物组分. 在 R、Q 型因子分析的基础上，结合沉积物的硅铁铝率（SiO2/（Al2O3+Fe2O3））、淋失系数（SiO2/（MgO+K2O））、CaO/MgO以及腐殖化度等指标，提取出古气候环境信息. 初步研究结果表明：近9.0cal ka BP以来，巴里坤湖地区气候环境仍以干旱化为主，全新世期间出现过多次不同程度的干湿变化，经历了5个气候阶段：9.0～7.5cal kaBP期间，气候干旱；7.5～5.8cal kaBP期间，气候温暖湿润，为研究区全新世最佳适宜期；5.8～3.0cal kaBP期间，气候干旱；3.0～1.0cal kaBP期间，气候湿润；1.0～0cal kaBP期间，气候干旱.
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关键词:
- 巴里坤湖 /
- 地化元素 /
- 古气候 /
- 近9.0cal ka BP以来
Abstract: Geochemical elements analysis of BLK-1，retrieved from Lake Barkol，NW China，was carried out by using SPSS，and envoronmentally geochemical elements components can be easily identified according to the variations in the Load of R（Q）-type factors. In addition，we used some other proxies as the auxiliary factors in the analysis process. The results have shown that the paleoclimate of Lake Barkol has a drought trend overall，although it has experienced an alternating climate process（cold-moisture and warm-dry）since 9.0cal kaBP，and the history of paleoclimatic changes was reconstructed as follows：（1）9.0-7.0cal kaBP，the palaeoclimate was dry；（2）7.5-5.8cal kaBP，the palaeoclimate was warm and humid，we suggested it’s the Holocene Optimum period of study area；（3）5.8-3.0cal kaBP，the palaeoclimate was dry；（4）3.0-1.0cal kaBP，the palaeoclimate was warm and humid；（5）1.0-0cal kaBP，the palaeoclimate was dry.-
Keywords:
- Lake Barkol /
- geochemical elements /
- paleoclimatic change /
- since 9.0cal kaBP
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