globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2016.04.010
Scopus记录号: 2-s2.0-84966339524
论文题名:
Quaternary magnetic and oxygen isotope stratigraphy in diatom-rich sediments of the southern Gardar Drift (IODP Site U1304, North Atlantic)
作者: Xuan C.; Channell J.E.T.; Hodell D.A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 142
起始页码: 74
结束页码: 89
语种: 英语
英文关键词: Diatoms ; IODP Site U1304 ; Magnetic excursions ; North Atlantic ; Oxygen isotopes ; Quaternary ; Relative paleointensity
Scopus关键词: Geomagnetism ; Isotopes ; Magnetism ; Oxygen ; Sediments ; Stratigraphy ; Submarine geology ; Wavelet analysis ; Diatoms ; IODP Site U1304 ; Magnetic excursions ; North Atlantic ; Oxygen isotopes ; Quaternary ; Relative paleointensity ; Oceanography ; deposition ; depositional environment ; diatom ; interglacial ; isotopic analysis ; magnetic intensity ; magnetic mineral ; magnetostratigraphy ; marine sediment ; mineralization ; Ocean Drilling Program ; oxygen isotope ; paleomagnetism ; Quaternary ; sedimentation ; sedimentation rate ; Atlantic Ocean ; Atlantic Ocean (North) ; Gardar Drift ; Guatemala [Central America] ; Santa Rosa ; Bacillariophyta
英文摘要: The sediment sequence from Integrated Ocean Drilling Program (IODP) Site U1304 (53°03.40'N, 33°31.78'W; water depth, 3024 m) on the southern Gardar Drift, North Atlantic Ocean, covers the last ~1.8 Myr with a mean sedimentation rate of ~15 cm/kyr. At Site U1304, paleomagnetic directional and relative paleointensity (RPI) records have been generated for the last ~1.5 Myr, and benthic oxygen isotope data for the last ~1 Myr. The age model for Site U1304 was established by matching δ18O and RPI data to calibrated reference records. Prominent intervals of diatom mats at Site U1304 are associated with the latter stages of interglacial marine isotope stages (MIS) 9, 11, 13, 15, 21, 27 and 35, and with the weak glacial of MIS 14. The deposition of diatom mats, and associated diluted magnetic mineral concentrations, leads to weak magnetizations and susceptibilities in these intervals. Comparison of histograms of paleomagnetic directions and RPI from diatom-rich sediments and from surrounding silty clays indicates that, although results from diatom-rich sediments are more scattered, the occurrence of diatom mats does not appreciably distort the paleomagnetic directional and RPI records. Site U1304 sediments record the Matuyama/Brunhes boundary (~772 ka), the Jaramillo Subchron (~993-1071 ka) and the Cobb Mountain Subchron (~1193-1219 ka), as well as three apparent geomagnetic excursions in the Matuyama Chron, interpreted as the "Kamikatsura/Santa Rosa", "Punaruu", and "Gardar" excursions, at ~888 ka, ~1124 ka, and ~1463 ka, respectively. The Site U1304 RPI record can be correlated with the PISO-1500 RPI stack and with other high-resolution RPI records from the North Atlantic Ocean. Wavelet analyses performed on the Site U1304 RPI record and a new high-resolution North Atlantic paleointensity stack for the last 1500 kyr (HINAPIS-1500), comprising Ocean Drilling Program (ODP) Sites 983, 984 and IODP Sites U1306 and U1304, did not reveal significant orbital power. © 2016 Elsevier Ltd.
资助项目: We thank Jason Curtis and Gianna Browne for processing of samples for stable isotope analyses, and Kainian Huang for assistance in the paleomagnetic laboratory. We gratefully acknowledge assistance from the scientific party and crew of R/V JOIDES Resolution during IODP Expedition 303, and from the curatorial staff at the IODP core repository in Bremen. Alain Mazaud, Joe Stoner, and Helen Evans helped with u-channel sampling. Research funded by NSF grants 0850413 and 1014506 to Channell and NERC grant NE/H009930/1 to Hodell. The HINAPIS-1500 stack is archived as Supplementary Data with this article, and other relevant data are archived in the Pangaea Database.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59589
Appears in Collections:过去全球变化的重建

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作者单位: School of Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Waterfront Campus, European Way, Southampton, United Kingdom; Department of Geological Sciences, University of Florida, 241 Williamson Hall, POB 112120, Gainesville, FL, United States; Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, Downing Street, Cambridge, United Kingdom

Recommended Citation:
Xuan C.,Channell J.E.T.,Hodell D.A.. Quaternary magnetic and oxygen isotope stratigraphy in diatom-rich sediments of the southern Gardar Drift (IODP Site U1304, North Atlantic)[J]. Quaternary Science Reviews,2016-01-01,142
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