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DOI	10.1130/B35184.1
	Accuracy and precision of the late eocene-early oligocene geomagnetic polarity time scale
	Sahy D.; Hiess J.; Fischer A.U.; Condon D.J.; Terry D.O.; Abels H.A.; Hüsing S.K.; Kuiper K.F.
发表日期	2020
ISSN	167606
起始页码	373
结束页码	388
卷号	132 期号:2021-01-02
英文摘要	An accurate and precise geomagnetic polarity time scale is crucial to the development of a chronologic framework in which to test paleoclimatic and paleoenvironmental interpretations of marine and terrestrial records of the Eocene-Oligocene transition (EOT). The magnetic polarity patterns of relatively continuous marine and terrestrial records of the EOT have been dated using both radioisotopic techniques and astronomical tuning, both of which can achieve a precision approaching ±30 k.y. for much of the Paleogene. However, the age of magnetic reversals between chrons C12n and C16n.2n has proved difficult to calibrate, with discrepancies of up to 250 k.y. between radio-isotopically dated and astronomically tuned marine successions, rising to 600 k.y. for comparisons with the 206Pb/238U-dated terrestrial record of the White River Group in North America. In this study, we reevaluate the magnetic polarity pattern of the Flagstaff Rim and Toadstool Geologic Park records of the White River Group (C12n-C16n.2n). Our interpretation of the Flagstaff Rim polarity record differs significantly from earlier studies, identifying a previously unreported normal polarity zone correlated to C15n, which eliminates discrepancies between the WRG and the 206Pb/238-dated marine record of the Rupelian Global Stratotype Section and Point in the Italian Umbria-Marche basin. However, residual discrepancies persist between U-Pb- dated and astronomically tuned records of the EOT even when stratigraphic and systematic uncertainties associated with each locality and dating method are taken into account, which suggests that the uncertainties associated with astronomically tuned records of the EOT may have been underestimated. © 2019 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184878
作者单位	NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, NG12 5GG, United Kingdom; Department of Geology, University of Leicester, University Road, Leicester, LE1 7RH, United Kingdom; Faculty of Earth and Life Sciences, Vrije Universiteit, 1085 De Boelelaan, Amsterdam, 1081 HV, Netherlands; Department of Earth and Environmental Science, Temple University, Philadelphia, PA 19122, United States; Department of Earth Sciences, Utrecht University, Budapestlaan 173584 CD, Netherlands
推荐引用方式 GB/T 7714	Sahy D.,Hiess J.,Fischer A.U.,et al. Accuracy and precision of the late eocene-early oligocene geomagnetic polarity time scale[J],2020,132(2021-01-02).
APA	Sahy D..,Hiess J..,Fischer A.U..,Condon D.J..,Terry D.O..,...&Kuiper K.F..(2020).Accuracy and precision of the late eocene-early oligocene geomagnetic polarity time scale.Bulletin of the Geological Society of America,132(2021-01-02).
MLA	Sahy D.,et al."Accuracy and precision of the late eocene-early oligocene geomagnetic polarity time scale".Bulletin of the Geological Society of America 132.2021-01-02(2020).