globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116625
论文题名:
An abrupt Middle-Miocene increase in fluid flow into the Leeward Margin Great Bahama Bank, constraints from δ44Ca and Δ47 values
作者: Staudigel P.T.; Higgins J.A.; Swart P.K.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 553
语种: 英语
中文关键词: calcium isotopes ; carbonate diagenesis ; clumped isotopes ; fluid advection ; paleohydrology ; sedimentology
英文关键词: Advection ; Calcium ; Isotopes ; Sediments ; Advective flux ; Calcium isotopes ; Carbonate platforms ; Clumped isotopes ; Different mechanisms ; Novel techniques ; Platform margins ; Relative contribution ; Flow of fluids ; advection ; calcium ; diagenesis ; fluid flow ; isotopic composition ; Miocene ; numerical model ; paleohydrology ; reconstruction ; sedimentology ; Atlantic Ocean ; Great Bahama Bank
英文摘要: The advection of seawater into the sediments deposited on the margins of Great Bahama Bank has been demonstrated to play in important role in ventilating the uppermost sediments, as well as supplying elements for diagenetic reactions deeper within the platform. Here, we implement a numerical model to calculate the rate of fluid advection at ODP Site 1003, using calcium isotopes as a tracer for fluid advection. A key parameter for this model, the rate of recrystallization of sediments, was constrained using the clumped isotope proxy. The model was tuned to existing datasets of clumped and carbonate calcium isotope measurements for this site. Results of this modeling effort indicate that, prior to ∼15 Ma, fluids were advected into the platform at a rate substantially lower than the present day. The rate of advection abruptly increased ∼13 Ma to a value greater than the present day. The increase in advective flux during the mid-Miocene coincides with a major reorganization of the platform from a ramp-like geometry to a steeper carbonate platform, indicating a change in the relative contributions of different mechanisms governing fluid flow on the platform margin and interior. This paper aims to explore the utility of using clumped and calcium isotopes to quantitatively reconstruct past fluid advection rates using this novel technique. © 2020
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被引频次[WOS]:6   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165678
Appears in Collections:气候变化与战略

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作者单位: Cardiff University, Main Building, Park Place, CF10 3AT, Cardiff, Wales, United Kingdom; Princeton University, Princeton, NJ, United States; University of Miami, Rosenstiel School for Marine and Atmospheric Science, Key Biscayne, FL, United States

Recommended Citation:
Staudigel P.T.,Higgins J.A.,Swart P.K.. An abrupt Middle-Miocene increase in fluid flow into the Leeward Margin Great Bahama Bank, constraints from δ44Ca and Δ47 values[J]. Earth and Planetary Science Letters,2021-01-01,553
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