Pathways of Environmental Diagenesis and Their Effects on the Acquisition of Natural Remanent Magnetization Recorded in Chinese Loess and Paleosol

环境成岩作用途径及其对中国黄土和古土壤自然剩磁记录获取的影响

• 批准号: 0003421
• 负责人: Subir Banerjee
• 金额: $ 16.5万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-02-01 至 2004-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0003421&HistoricalAwards=false
• 关键词: Pathways; Environmental; Diagenesis; Their; Effects

Banerjee EAR-0003421 Century to millennial scale abrupt changes in summer rainfall and winter dust storms in the loess plateau region of China have been recorded in the varying grain-size, chemical composition and magnetic properties of the wind-borne loess sediments. The investigator will advance the current qualitative understanding of the relative variations in paleoclimate of China by calibrating the paleo-records from sediments in terms of rainfall and temperature variations. From Xining in the north-west to Huanxian in the south-east, a three-site transect with known temperature and rainfall variations will be sampled as a function of time, back to the last 130,000 years. These samples will be studied for their grain-size, chemical composition and magnetic properties, both in the field and in the laboratory, to establish an accurate paleoclimate record.

黄土高原地区夏季降水和冬季沙尘暴发生了世纪至千年尺度的突变，这些突变记录在风载黄土沉积物的粒度、化学成分和磁性变化中。研究人员将通过校准来自沉积物的降雨和温度变化的古记录，推进目前对中国古气候相对变化的定性认识。从西北部的西宁到东南部的环县，将对已知温度和降雨量变化的三个地点的样带进行采样，作为时间的函数，可以追溯到过去的13万年。将在实地和实验室研究这些样品的粒度、化学成分和磁性，以建立准确的古气候记录。