摘要
本文根据察汗斯拉图盐湖的孢粉组合、古地磁及^(14)C、铀系断代年龄资料,在370万年以来的地层中划分了13个冷暖交替的孢粉组合带。在松山/高斯和布容/松山界面附近古气候变化明显。100万年以来,本区地层在古气候和年代上均可与洛川黄土及深海δ^(18)O气候记录阶段对比,据此将本区Q/N界限定为248万年,Q_2/Q_1界限定为73万年,Q_3/Q_2界限定为10—12万年。
This paper introduces the results of sporo-pollen analysis, paleomagnetic determination, 14C and uranium series isotope dating of two cores in Chahanshilatu Salt Lake, Chaidamu Basin.The zones were alternated by 13 cold and warm sporo-pollen strata. The obvious paleoc-limatic changes over and under the Matuyama/Gauss and Brunches/Matuyama boundaries can be correlated with those of Luochuan Loess.Since 1 Ma B. P., the paleoclimate and the age of the sporo-pollen zones of this salt lake can be correlated in general with those of the loess beds and paleosoil beds of Luochuan Loess.For these reasons, the lower boundary of Quarternary Strata in the region was defined as Matuyama/Gauss boundary (2.48 Ma B. P.). Quarternary strata were divided into Lower-Pleistocene, Middle-Pleistocene and Upper-Pleistocene Series. Holocene Series is absent.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1990年第3期241-254,共14页
Oceanologia Et Limnologia Sinica
