论新疆巴里坤湖沉积地球化学指标的累积规律

于１９８９年８月，在新疆巴里坤湖区进行多次野外调查和钻孔取样，将１１６块岩芯样用等离子发射光谱对各种微量元素和氧化物进行全面分析，以研究古气候与古环境的演变关系。研究得知，本区多数微量元素以碎屑形式机械迁移为主，因此，在地表径流较丰富的凉湿或冷湿环境，湖底沉积的元素相对富集；反之，在地表径流减少的暖干环境，元素富集减少。这种元素的迁移规律，表明干旱区内陆确存在冷湿暖干型的气候特征，不同于东部季风区

THE ACCUMULATING REGULATION OF DEPOSIT GEOCHEMISTRY OF BALIKUN LAKE, XINJIANG

Trace elements and some oxides in 116 sediments core samples taken in August,1989 from Balikun Lake in northeastern Xinjiang were analysed using inductively coupled plasma spectrometry. Chemical elements are accumulated under the prevailing conditions of dry climate and little precipitation, strong physical weathering and slight undulation of topography. Most trace elements migrate mainly by means of debris element accumulation increased with increasing runoff during the cool or coldmoisture periods, but decreased with decreasing runoff during the warm-dry periods.Therefore, the migration and accumulation of chemical elements in arid areas are deeply affected by the a1ternation of cold-moisture and warm-dry inland climate.Lacustrine facies chemical elements in arid areas are very important bases for paleo-climate study because of their high resolution and high-sensitivity to paleoclimate.But the organic matter, although its indication of paleoclimate is clear, was comp-licatedly affected by many factors. So in order to show the distinctive regulation of accumulation and paleoclimatic significance of organic matter, comprehensive stu-dies, combined with other paleoclimatic marks have to be made.