期刊
GEOLOGY
卷 31, 期 9, 页码 749-752出版社
GEOLOGICAL SOC AMER, INC
DOI: 10.1130/G19643.1
关键词
Larsen Ice Shelf; Antarctic Peninsula; geomagnetic paleointensity; holocene
类别
A sedimentary record collected from beneath the former Larsen-A Ice Shelf reveals the Holocene history of the Larsen-A region. The record begins with the transition from grounded ice to a floating ice shelf, completed by 10.7 +/- 0.5 ka, and ends with the modern recession. The record contains several late Holocene diatomaceous ooze layers that suggest proximity to productive open-water events. Radiocarbon ages obtained from these sediments were compticated by the presence of detrital and reworked carbon. We have eliminated these complications and constructed a chronology for the Larsen-A Ice Shelf history via tuning of the geomagnetic field paleointensity record with a reference curve. This approach provides chronological control to sediment sequences that lack appropriate material for radiocarbon dating. Geomagnetic palleointensity features with wavelengths of 2-3 k.y. can be recognized and interhemispherically correlated, illustrating the potential to use geomagnetic palleointensity variations as a global correlation and dating tool at sub-Milankovitch time scales.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据