Technical note: Late Pliocene age control and composite depths at ODP Site 982, revisited

Technical note: Late Pliocene age control and composite depths at ODP Site 982, revisited
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技术说明:ODP 982 站点上新世晚期的年龄控制和复合深度,重新审视

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发表时间:
2012
期刊:
影响因子:
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通讯作者:
B. Naafs
B. Naafs
中科院分区:
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文献类型:
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作者:
N. Khélifi;M. Sarnthein;B. Naafs

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大洋钻探计划(ODP)982号站点为重建东北大西洋古海洋学和监测上新世晚期至第四纪北方半球主要冰川作用开始期间的底栖δ 18 O地层提供了一个关键的沉积剖面。重新对磁性地层反转进行特定孔检查,并在982 A、B和C孔的上新世短剖面中增加海底δ 18 O记录,穿过982 B孔公布的δ 18 O记录中的岩心间断,这意味着对复合岩心深度进行了重大修订。在调谐到轨道调谐的参考记录LR 04之后,新的合成δ 18 O记录导致了一个间断,Kaena磁亚时可能已经丢失,并且在320 - 270万年前(Ma)的时间跨度内,所有代理记录的年龄显著减少了130 - 20 ky。我们的研究表明,在ODP沉积物记录中,可靠的复合深度尺度和δ 18 O地层对于古海洋学中产生全洋相关性具有普遍意义。年龄控制的新概念使得982站上新世晚期SST(海表温度)和大气pCO 2的趋势与北大西洋其他地方发表的各种古气候趋势更加一致。
Ocean Drilling Program (ODP) Site 982 provided a key sediment section at Rockall Plateau for reconstructing northeast Atlantic paleoceanography and monitoring benthic δ18O stratigraphy over the late Pliocene to Quaternary onset of major Northern Hemisphere glaciation. A renewed hole-specific inspection of magnetostratigraphic reversals and the addition of epibenthic δ18O records for short Pliocene sections in holes 982A, B, and C, crossing core breaks in the δ18O record published for Hole 982B, now imply a major revision of composite core depths. After tuning to the orbitally tuned reference record LR04, the new composite δ18O record results in a hiatus, where the Kaena magnetic subchron might have been lost, and in a significant age reduction for all proxy records by 130 to 20 ky over the time span 3.2–2.7 million years ago (Ma). Our study demonstrates the general significance of reliable composite-depth scales and δ18O stratigraphies in ODP sediment records for generating ocean-wide correlations in paleoceanography. The new concept of age control makes the late Pliocene trends in SST (sea surface temperature) and atmospheric pCO2 at Site 982 more consistent with various paleoclimate trends published from elsewhere in the North Atlantic.
3·5-3·3Ma前上新世地中海外流的一次重大且长期的强化
DOI: 10.1130/g30058a.1
发表时间: 2009
期刊: Geology
影响因子: 5.8
作者:
Khèlifi N;Sarnthein M;Andersen N;Blanz T;Frank M;Garbe-Schönberg D;Haley B.A;Stumpf R;Weinelt M.
通讯作者: Weinelt M.
上新世晚期北大西洋洋流的变化
DOI: 10.1016/j.epsl.2010.08.023
发表时间: 2010
影响因子: 5.3
作者:
Naafs B.D;Stein R;Hefter J;Khèlifi N;De Schepper S;Haug G.H.
通讯作者: Haug G.H.