globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.06.023
论文题名:
Chemostratigraphic age model for the Tornillo Group: A possible link between fluvial stratigraphy and climate
作者: Bataille C.P.; Watford D.; Ruegg S.; Lowe A.; Bowen G.J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 457
起始页码: 277
结束页码: 289
语种: 英语
英文关键词: Carbon isotope ratio ; Cretaceous ; Hyperthermals ; K/Pg boundary ; Paleogene ; Paleosols ; Pedogenic carbonate
英文摘要: The expression of global climate trends (106 to 107 years) and events (105 years) in terrestrial sedimentary sections can only be assessed from long, continuous continental records. Such records are rare due to the paucity of well-dated terrestrial deposits covering millions of years. This study uses isotope chemostratigraphy to develop an age model for fluvial sedimentary rocks of the Tornillo Group (Tornillo Basin, TX) and to decipher the potential expression of global climate variations in this sub-tropical paleo-fluvial system. The carbon isotope ratio (δ13C) of Tornillo Group pedogenic carbonate correlates well with δ13C variations from benthic foraminifera and suggests deposition between ˜ 69 Ma and ˜ 52 Ma for the studied stratigraphic interval. Higher sediment accumulation rates occurred in the greenhouse period of the early Eocene than during the cooler middle Paleocene. Carbon isotope excursions associated with Eocene hyperthermals were not identified, but their predicted stratigraphic positions coincide with thick sand bodies. We interpret the long-term sediment accumulation rates and rapid shifts in facies distribution as reflecting change in sediment supply in the basin, possibly driven by fluctuations in precipitation seasonality and intensity driven associated with global temperature changes. Carbon and oxygen isotope ratios from pedogenic carbonates display a strong correlation throughout the section, interpreted as an expression of coupling between the hydrological cycle and soil processes. Those observations suggest that global climate variations, along with tectonic and eustatic sea-level changes, may be an important control of stratigraphic variations of the Tornillo Group at multiple timescales. © 2016
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68356
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作者单位: University of North Carolina, Geological Sciences, 104 South Road, Mitchell HallNC, United States; University of Utah, Department of Geology and Geophysics, Salt Lake City, UT, United States

Recommended Citation:
Bataille C.P.,Watford D.,Ruegg S.,et al. Chemostratigraphic age model for the Tornillo Group: A possible link between fluvial stratigraphy and climate[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,457
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