The floating astronomical time scale for the terrestrial Late Cretaceous Qingshankou Formation from the Songliao Basin of Northeast China and its stratigraphic and paleoclimate implications
The floating astronomical time scale for the terrestrial Late Cretaceous Qingshankou Formation from the Songliao Basin of Northeast China and its stratigraphic and paleoclimate implications
复制标题
松辽盆地晚白垩世青山口组陆相的浮动天文时间尺度及其地层和古气候意义
DOI：
10.1016/j.epsl.2008.12.016
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发表时间：
2009-02
影响因子：
5.3
通讯作者：
Zhang, Shihong
中科院分区：
文献类型：
--
作者：
Wu, Huaichun;Huang, Qinghua;Jiang, Ganqing;Zhang, Shihong
松辽盆地上白垩统青山口组（K2qn）由厚达550 m的湖相泥岩和页岩组成，是大庆油田重要的烃源岩之一。对青山口组（K2qn） 10口井的自然伽马测井资料进行了高分辨率旋回地层分析，揭示了进动（20ka）、倾角（40ka）和偏心率（100ka和405 ka）的轨道旋回，为晚白垩世陆地环境的天文驱动气候变化提供了有力证据。各剖面均建立了浮动天文时标（ATS），显示了K2qn在整个盆地范围内（1.09 Ma - 5.20 Ma）的变化持续时间和湖相地层较强的历时性。盆地中部可识别出四个高沉积速率时期，可能记录了持续潮湿气候和高度化学风化时期的沉积。在米兰科维奇旋回发育最完整、最稳定的盆地中央坳陷带M206井建立的ATS表明，K2qn的最大持续时间为5.20 Ma （94.27 Ma - 89.07 Ma，晚Cenomanian -早Coniacian）。Cenomanian-Turonian边界的湖泊缺氧事件1 （LAE1）持续了~ 210-310 ka，在此期间沉积了SLB最丰富的烃源岩。SLB中LAE1的起始时间（~94.21 ~ 94.18 Ma）和持续时间（~210 ~ 310 Ka）与海洋缺氧事件2 （OAE2，起始时间为94.21 Ma，持续时间为~320 ~ 900 Ka）相当，表明相同的触发机制，如大规模火成岩活动引起的大气co2增加，可能在海洋和陆地系统中引发了高初级生产力和有机碳埋藏。
The Upper Cretaceous Qingshankou Formation (K2qn) in the Songliao Basin (SLB) of Northeast China consists of up to 550 m thick, lacustrine mudstone and shale that constitute one of the most important source rocks of the Daqing oil field. A high-resolution cyclostratigraphic analysis of the natural gamma-ray logging from 10 wells of the Qingshankou Formation (K2qn) reveals orbital cycles of precession (20 ka), obliquity (40 ka) and eccentricity (100 ka and 405 ka), providing strong evidence for astronomically driven climate changes in the Late Cretaceous terrestrial environments. Floating astronomical time scales (ATS) are established for all sections, which demonstrate variable durations of K2qn across the basin (1.09 Ma–5.20 Ma) and strong diachroneity of the lacustrine strata. Four periods of high depositional rates can be identified in the central parts of the basin, possibly recording deposition during times of sustained wet climate and high chemical weathering. An ATS established from well M206 in the central depression zone of the basin, where the most complete and stable Milankovitch cycles are present, suggests that the maximum duration of the K2qn is 5.20 Ma (from 94.27 Ma to 89.07 Ma; Late Cenomanian to Early Coniacian). The lacustrine anoxic event 1 (LAE1) at the Cenomanian–Turonian boundary lasted ~210–310 ka, during which the most prolific petroleum source rocks in SLB were deposited. The onset (~94.21–94.18 Ma) and duration (~210–310 Ka) of LAE1 in SLB are comparable to those of the oceanic anoxic event 2 (OAE2; onset at 94.21 Ma and duration of ~320–900 ka), suggesting that the same trigger mechanism, such as increased atmospheric CO2from large-scale igneous activity, may have initiated high primary productivity and organic carbon burial in both marine and terrestrial systems.
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影响因子：
3.5
作者：
A. Prokoph;F. Agterberg
通讯作者：
A. Prokoph;F. Agterberg
DOI：
10.1098/rsta.1999.0400
发表时间：
1999-07
期刊：
Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences
影响因子：
--
作者：
P. Olsen;D. Kent
通讯作者：
P. Olsen;D. Kent
影响因子：
5.8
作者：
A. Draut;P. Clift
通讯作者：
A. Draut;P. Clift
DOI：
--
发表时间：
2001
期刊：
--
影响因子：
--
作者：
L. Wen
通讯作者：
L. Wen
影响因子：
--
作者：
Westerhold, Thomas;Roehl, Ursula;Zachos, James C.
通讯作者：
Zachos, James C.