Paleomagnetic and Mineral Magnetic Studies of Lake Sediments, Venezuelan Andes

PI计划调查委内瑞拉安第斯山脉一系列湖泊沉积物的古磁学和矿物磁学特征。正在进行这项研究，以进一步确定该地区的古气候变化。这些湖泊的海拔高度从1000米到3500米不等，麻省大学的同事们对它们进行了采样和研究，他们制作了一份基于地球化学的过去18000年的古气候记录。将利用磁场的倾角和相对赤纬测量来研究湖泊沉积物的长期变化。磁特征的载体及其颗粒尺寸将在已有的湖泊岩心亚样品上进行详细的研究。磁学数据与同一岩心的详细地球化学和孢粉学数据相结合，将提供古气候学研究技术的相关性，为先前的解释提供佐证，并提供有关北安第斯山脉古气候和古环境的新信息。

The PI plans to investigate the paleomagnetic and mineral magnetic character of sediments from a series of lakes in the Venezuelan Andes. This research is being undertaken to further define paleoclimatic variation in the region. The lakes, ranging in altitude from 1000 to 3,500 m, have been sampled and studied by colleagues from U. Mass who have produced a geochemical based paleoclimatic record for the past 18,000 years. Secular variation of the lake sediments will be studied using inclination and relative declination measurements of the magnetic field. The carriers of the magnetic signature, as well as their grain size will be investigated in detail on subsamples from preexisting lake cores. The magnetic data, in conjunction with detailed geochemical and palynological data on the same cores, will provide a correlation of techniques in paleoclimatology studies, provide for corroboration of previous interpretations, and present new information on the paleoclimitalogy and paleoenvironment of the northern Andes.