Evidence for the Kamikatsura and Santa Rosa excursions recorded in eolian deposits from the southern Chinese Loess Plateau
Evidence for the Kamikatsura and Santa Rosa excursions recorded in eolian deposits from the southern Chinese Loess Plateau
复制标题
DOI：
10.1029/2004jb002966
复制
发表时间：
2004-12
影响因子：
--
通讯作者：
Tianshui Yang;M. Hyodo;Zhenyu Yang;Jianli Fu
中科院分区：
文献类型：
--
作者：
Tianshui Yang;M. Hyodo;Zhenyu Yang;Jianli Fu
[1]通过对宝鸡黄土-古土壤序列的古地磁研究，揭示了松山纪晚期两次明显的地磁漂移，并推断了其相对古强度最小值。岩石磁学实验表明，L9黄土单元中的漂移层段的沉积物具有与周围正极性层段和反极性层段相同的磁性。假设Jaramillo-Matuyama和Matuyama-Brunhes磁极边界之间的沉积速率恒定，这两次偏移的中点年龄和持续时间估计分别为0.89 Ma和16 kyr，以及0.92 Ma和7 kyr。此外，这两个事件被一个极性完全反转的时间间隔隔开，持续时间为16 kyr。这些估计支持古气候推断的年龄限制。这两次旅行可能分别与Kamikatelo和圣罗莎旅行有关。
[1] A detailed paleomagnetic investigation of a loess-paleosol sequence in Baoji, southern Chinese Loess Plateau, reveals two distinct geomagnetic excursions accompanied by inferred relative paleointensity minima in the late Matuyama Chron. Rock magnetic experiments demonstrate that the sediments of the excursion intervals, in loess unit L9, have the same magnetic properties as those from surrounding normal and reversed polarity intervals. Assuming constant sedimentation rate between the Jaramillo-Matuyama and Matuyama-Brunhes magnetic polarity boundaries, the midpoint ages and durations for these two excursions are estimated at 0.89 Ma and 16 kyr, and 0.92 Ma and 7 kyr, respectively. In addition, these two events are separated by an interval with fully reversed polarity that had a duration of 16 kyr. These estimates are supported by paleoclimatologically inferred age constraints. The two excursions are probably correlated with the Kamikatsura and Santa Rosa excursions, respectively.