主要对泥河湾盆地下沙沟动物群（即狭义的泥河湾动物群）所在剖面河湖相沉积物进行了详细的磁性地层学和岩石磁学研究，揭示出下沙沟剖面记录了高斯正极性时（Gauss normal chron）晚期、松山负极性时（Matuyama reverse chron）及布容...主要对泥河湾盆地下沙沟动物群（即狭义的泥河湾动物群）所在剖面河湖相沉积物进行了详细的磁性地层学和岩石磁学研究，揭示出下沙沟剖面记录了高斯正极性时（Gauss normal chron）晚期、松山负极性时（Matuyama reverse chron）及布容正极性时（Brunhes normal chron）。下沙沟动物群的层位跨越留尼旺（Reunion normal subchron）和奥杜威（Olduvai normal subchron）正极性亚时，其年代约为2.2~1.7Ma。上新世/更新世界限（高斯/松山（Gauss/Matuyama）地磁极性倒转界限）位于下沙沟剖面底部。结合前人研究结果，将泥河湾盆地已有磁性地层年代数据的动物群标注在地磁极性年表上，获得了泥河湾动物群的年代序列，结果表明泥河湾动物群位于高斯/松山和松山/布容（Matuyama/Brunhes）两个地磁极性倒转界限之间，因此，泥河湾动物群的年代区间为2.6~0.8Ma，这一研究结果完善了泥河湾盆地的生物地层年代学框架。展开更多
Rock magnetic and magnetostratigraphic investigations on a lacustrine sequence in the Nihewan Basin, northern China, which bears the Cenjiawan Paleolithic site, indicate that the dominant magnetic mineral and remanenc...Rock magnetic and magnetostratigraphic investigations on a lacustrine sequence in the Nihewan Basin, northern China, which bears the Cenjiawan Paleolithic site, indicate that the dominant magnetic mineral and remanence carrier contained in the sediments is magnetite. While hematite co-exists with magnetite in some portions of the Cenjiawan sequence, where characteristic remanent magnetizations are carried by both magnetite and hematite. Measurements of anisotropy of magnetic susceptibility confirm that the Cenjiawan sequence has preserved the original sedimentary features and is suitable for magnetostratigraphic study. Paleomagnetic results indicate that the Cenjiawan Paleolithic site is formed just posterior to the Punaruu normal event, which is dated at about 1.1 Ma. Combined with the paleomagnetic results of the Donggutuo, Xiaochangliang and Majuangou sections, it is concluded that early humans were occupying the Nihewan Basin around 1.6, 1.3 and 1.1 Ma. This integrated result is significant to understanding the ability of migration and adaptation to the envi- ronment of early humans.展开更多
文摘主要对泥河湾盆地下沙沟动物群（即狭义的泥河湾动物群）所在剖面河湖相沉积物进行了详细的磁性地层学和岩石磁学研究，揭示出下沙沟剖面记录了高斯正极性时（Gauss normal chron）晚期、松山负极性时（Matuyama reverse chron）及布容正极性时（Brunhes normal chron）。下沙沟动物群的层位跨越留尼旺（Reunion normal subchron）和奥杜威（Olduvai normal subchron）正极性亚时，其年代约为2.2~1.7Ma。上新世/更新世界限（高斯/松山（Gauss/Matuyama）地磁极性倒转界限）位于下沙沟剖面底部。结合前人研究结果，将泥河湾盆地已有磁性地层年代数据的动物群标注在地磁极性年表上，获得了泥河湾动物群的年代序列，结果表明泥河湾动物群位于高斯/松山和松山/布容（Matuyama/Brunhes）两个地磁极性倒转界限之间，因此，泥河湾动物群的年代区间为2.6~0.8Ma，这一研究结果完善了泥河湾盆地的生物地层年代学框架。
基金supported by the National Natural Science Foundation of China(Grant Nos.20414930 and 40221402).
文摘Rock magnetic and magnetostratigraphic investigations on a lacustrine sequence in the Nihewan Basin, northern China, which bears the Cenjiawan Paleolithic site, indicate that the dominant magnetic mineral and remanence carrier contained in the sediments is magnetite. While hematite co-exists with magnetite in some portions of the Cenjiawan sequence, where characteristic remanent magnetizations are carried by both magnetite and hematite. Measurements of anisotropy of magnetic susceptibility confirm that the Cenjiawan sequence has preserved the original sedimentary features and is suitable for magnetostratigraphic study. Paleomagnetic results indicate that the Cenjiawan Paleolithic site is formed just posterior to the Punaruu normal event, which is dated at about 1.1 Ma. Combined with the paleomagnetic results of the Donggutuo, Xiaochangliang and Majuangou sections, it is concluded that early humans were occupying the Nihewan Basin around 1.6, 1.3 and 1.1 Ma. This integrated result is significant to understanding the ability of migration and adaptation to the envi- ronment of early humans.
