Latest on the absolute age of the Paleocene–Eocene Thermal Maximum (PETM): New insights from exact stratigraphic position of key ash layers + 19 and − 17

Latest on the absolute age of the Paleocene–Eocene Thermal Maximum (PETM): New insights from exact stratigraphic position of key ash layers + 19 and − 17
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古新世至始新世最热期 (PETM) 绝对年龄的最新信息:来自关键火山灰层 19 和 â 17 确切地层位置的新见解

DOI:
10.1016/j.epsl.2009.08.027
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发表时间:
2009
影响因子:
5.3
通讯作者:
Zachos
Zachos
中科院分区:
地球科学1区
文献类型:
--
作者:
Westerhold;McCarren;Zachos

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我们构建了一个精确的早始新世轨道旋回地层DSDP站点550(腿80,戈班支线,北大西洋)利用岁差相关的周期中所代表的高分辨率X射线荧光钡岩心日志。基于对这些循环的计数,我们限制了550号站点两个火山灰层的确切时间,这两个火山灰层与丹麦富尔组的+19和-17灰相关联。相对于古新世-始新世最大热期(PETM)的开始,这些灰烬分别被抵消了862 kyr和672 kyr。当结合已发表的灰烬-17的绝对年龄时,PETM开始的绝对年龄与天文学校准的年龄一致。使用菲什峡谷凝灰岩(FCT)标准的当前绝对年龄28.02 Ma来校准火山灰的绝对年龄-17与Westerhold等人(2008年)天文学校准的古新世时标中的调整选项2一致[Westerhold,T.,罗尔大学拉菲岛Fornaciari,E.,Monechi,S.,Reale,V.,Bowles,J.,和Evans,H.F.,2008年,古新世时间的天文校准:古地理学、古气候学、古生态学,第257卷,第377-403页]。使用最近重新校准的绝对年龄28.201Ma的FCT标准是一致的调整选项3在天文校准的古新世时间尺度。新的结果并不支持在古新世早期天文调谐的时间尺度中存在任何额外的405-kyr周期。
We constructed a precise early Eocene orbital cyclostratigraphy for DSDP Site 550 (Leg 80, Goban Spur, North Atlantic) utilizing precession related cycles as represented in a high-resolution X-ray fluorescence based barium core log. Based on counting of those cycles, we constrain the exact timing of two volcanic ash layers in Site 550 which correlate to ashes +19 and −17 of the Fur Formation in Denmark. The ashes, relative to the onset of the Paleocene–Eocene Thermal Maximum (PETM), are offset by 862kyr and 672kyr, respectively. When combined with published absolute ages for ash −17, the absolute age for the onset of the PETM is consistent with astronomically calibrated ages. Using the current absolute age of 28.02Ma for the Fish Canyon Tuff (FCT) standard for calibrating the absolute age of ash −17 is consistent with tuning option 2 in the astronomically calibrated Paleocene time scale of Westerhold et al. (2008) [Westerhold, T., Röhl, U., Raffi, I., Fornaciari, E., Monechi, S., Reale, V., Bowles, J., and Evans, H.F., 2008, Astronomical calibration of the Paleocene time: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 257, p. 377–403]. Using the recently recalibrated absolute age of 28.201Ma for the FCT standard is consistent with tuning option 3 in the astronomically calibrated Paleocene time scale. The new results do not support the existence of any additional 405-kyr cycle in the early Paleocene astronomically tuned time scale.
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