一个放射性测年时间表对标志性的1992年古里雅冰芯的年代学提出了挑战。
A radiometric timescale challenges the chronology of the iconic 1992 Guliya ice core.
作者信息
Hou Shugui, Jenk Theo M, Jiang Wei, Zhang Wangbin, Hu Huanting, Feng Xin, Li Hao, Wu Shuang-Ye, Pang Hongxi, Yu Jinhai, Huang Renhui, Lu Zheng-Tian, Yang Guo-Min, Bender Michael, Schwikowski Margit
机构信息
School of Oceanography, Shanghai Jiao Tong University, Shanghai 200240, China.
School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China.
出版信息
Sci Adv. 2025 Sep 12;11(37):eadx8837. doi: 10.1126/sciadv.adx8837.
The Guliya (Tibet) ice core drilled in 1992 (GP1992) has garnered special interest because of its exceptionally long timescale of ~760 thousand years. This timescale makes GP1992 currently the second oldest ice core in the world, much older than any other extrapolar ice cores. Here, we revisit the GP1992 timescale by dating a Guliya ice core (GP2021) that was drilled close to the GP1992 drilling site in 2021. All our data, including the absolute dates deduced from Pb, Ar, and C, confirmed an age of <3 thousand years at 175.1 meters depth of GP2021, compared with ~100 thousand years previously estimated at the stratigraphically equivalent depth in GP1992. Our results resolved several discrepancies between the GP1992 and other paleoclimate records in the region, leading to different insights in climate history of the Tibetan Plateau.
1992年钻取的古里雅（西藏）冰芯（GP1992）因其约76万年的超长时间尺度而备受关注。这一时间尺度使GP1992成为目前世界上第二古老的冰芯，比任何其他极地以外的冰芯都要古老得多。在此，我们通过对2021年在靠近GP1992钻探地点钻取的古里雅冰芯（GP2021）进行测年，重新审视GP1992的时间尺度。我们所有的数据，包括从铅、氩和碳推断出的绝对年代，都证实了GP2021在175.1米深度处的年龄小于3000年，而在GP1992中地层等效深度处此前估计约为10万年。我们的结果解决了GP1992与该地区其他古气候记录之间的几个差异，为青藏高原的气候历史带来了不同的见解。
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