气候变化领域集成服务门户(CCPortal): An abrupt Middle-Miocene increase in fluid flow into the Leeward Margin Great Bahama Bank, constraints from δ44Ca and Δ47 values

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DOI	10.1016/j.epsl.2020.116625
	An abrupt Middle-Miocene increase in fluid flow into the Leeward Margin Great Bahama Bank, constraints from δ44Ca and Δ47 values
	Staudigel P.T.; Higgins J.A.; Swart P.K.
发表日期	2021
ISSN	0012821X
卷号	553
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
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203300
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
推荐引用方式 GB/T 7714	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],2021,553.
APA	Staudigel P.T.,Higgins J.A.,&Swart P.K..(2021).An abrupt Middle-Miocene increase in fluid flow into the Leeward Margin Great Bahama Bank, constraints from δ44Ca and Δ47 values.Earth and Planetary Science Letters,553.
MLA	Staudigel P.T.,et al."An abrupt Middle-Miocene increase in fluid flow into the Leeward Margin Great Bahama Bank, constraints from δ44Ca and Δ47 values".Earth and Planetary Science Letters 553(2021).