冀北-辽西地区晚侏罗世-早白垩世盆地充填序列的精细年代学研究：以滦平盆地和北票盆地为例

我国冀北-辽西地区侏罗系-白垩系地层出露广泛、连续且保存完好，同时又是热河生物群的发源地，是岩石学、沉积地层学和古生物学等多学科研究的焦点。然而现有的晚中生代各地层命名不同，且同位素绝对年龄精度有限，不仅限制了冀北-辽西地层的区域和跨区对比，还局限了对盆地迁移-多期次岩浆-火山活动与古环境响应以及生物群兴衰的联系的讨论。本项目拟对冀北滦平盆地和辽西北票（金-羊）盆地晚侏罗世-早白垩世的典型剖面的火山岩和凝灰岩进行高精度CA-TIMS定年，精确限定各地层单位的持续时限，建立和完善目标盆地的晚侏罗世-早白垩世充填序列的高精度年代学框架，为区域和全球对比提供精确的时间尺度依据。

The Jurassic-Cretaceous strata in the Northern Hebei and Western Liaoning are widespread and well-preserved, and famous for the Jehol Biota. It offers an unparalleled opportunity to conduct multidisciplinary researches such as petrology, sedimentology and paleontology. However, it is difficult for the detailed study of filling processes in time and space due to the limited precision of the existing radiometric ages. We plan to conduct the high resolution geochronological investigations into the basin fills of Late Jurassic - Early Cretaceous in Luanping basin and Beipiao basin by CA-TIMS method, so as to put tight constraints on the ages of the basin fills. This proposal not only provides the high resolution geochronological data of the volcanics and ashes within the Late Jurassic - Early Cretaceous sequences, but also improves the chronological framework of studied area, which is fundamental for precise local and global correlation.