globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2014.10.037
论文题名:
Challenging the sensitivity limits of Paleomagnetism: Magnetostratigraphy of weakly magnetized Guadalupian-Lopingian (Permian) Limestone from Kyushu, Japan
作者: Kirschvink J.L.; Isozaki Y.; Shibuya H.; Otofuji Y.-I.; Raub T.D.; Hilburn I.A.; Kasuya T.; Yokoyama M.; Bonifacie M.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 418
起始页码: 75
结束页码: 89
语种: 英语
英文关键词: Illawarra Reversal ; Kiaman superchron ; Limestone ; Mass extinction ; Paleomagnetism ; Permian
英文摘要: Despite their utility for bio- and chemostratigraphy, many carbonate platform sequences have been difficult to analyze using paleomagnetic techniques due to their extraordinarily weak natural remanent magnetizations (NRMs). However, the physical processes of magnetization imply that stable NRMs can be preserved that are many orders of magnitude below our present measurement abilities. Recent advances in reducing the noise level of superconducting magnetometer systems, particularly the introduction of DC-SQUID sensors and development of a low-noise sample handling system using thin-walled quartz-glass vacuum tubes, have solved many of these instrumentation problems, increasing the effective sensitivity by a factor of nearly 50 over the previous techniques of SQUID moment magnetometry.Here we report the successful isolation of a two-polarity characteristic remanent magnetization from Middle-Late Permian limestone formed in the atoll of a mid-oceanic paleo-seamount, now preserved in the Jurassic accretionary complex in Japan, which had proved difficult to analyze in past studies. Paleothermometric indicators including Conodont Alteration Indices, carbonate petrology, and clumped isotope paleothermometry are consistent with peak burial temperatures close to 130°C, consistent with rock magnetic indicators suggesting fine-grained magnetite and hematite holds the NRM. The magnetic polarity pattern is in broad agreement with previous global magnetostratigraphic summaries from the interval of the Early-Middle Permian Kiaman Reversed Superchron and the Permian-Triassic mixed interval, and ties the Tethyan-Panthalassan fusuline zones to it. Elevated levels of hematite associated with the positive δ13Ccarb of the Kamura event argue for a brief spike in environmental oxygen. The results also place the paleo-seamount at a paleolatitude of ~12° S, in the middle of the Panthalassan Ocean, and imply a N/NW transport toward the Asian margin of Pangea during Triassic and Jurassic times, in accordance with the predicted trajectory from its tectono-sedimentary background. These developments should expand the applicability of magnetostratigraphic techniques to many additional portions of the Geological time scale. © 2014.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69048
Appears in Collections:过去全球变化的重建

Files in This Item:

There are no files associated with this item.


作者单位: Division of Geological and oPlanetary Sciences, California Institute of Technology, 170-25, Pasadena, CA, United States; Earth-Life Science Institute, Tokyo Institute of Technology, Meguro, Tokyo, Japan; Dept. Earth Sci. Astron., Univ. Tokyo, Meguro, Tokyo, Japan; Dept. Earth and Env. Sci., Kumamoto Univ., Kumamoto, Japan; Dept. Earth Planet. Sci., Kobe Univ., Kobe, Japan; Dept. of Earth Sciences, University of St Andrews, St Andrews, Scotland, United Kingdom; Institut de Physique du Globe de Paris, Laboratoire Géochimie des Isotopes Stables, IPGP, Bureau 515, rue Jussieu, Paris cedex 05, France

Recommended Citation:
Kirschvink J.L.,Isozaki Y.,Shibuya H.,et al. Challenging the sensitivity limits of Paleomagnetism: Magnetostratigraphy of weakly magnetized Guadalupian-Lopingian (Permian) Limestone from Kyushu, Japan[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,418
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Kirschvink J.L.]'s Articles
[Isozaki Y.]'s Articles
[Shibuya H.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Kirschvink J.L.]'s Articles
[Isozaki Y.]'s Articles
[Shibuya H.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Kirschvink J.L.]‘s Articles
[Isozaki Y.]‘s Articles
[Shibuya H.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.