globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116475
论文题名:
Astronomically forced climate change in the late Cambrian
作者: Sørensen A.L.; Nielsen A.T.; Thibault N.; Zhao Z.; Schovsbo N.H.; Dahl T.W.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 548
语种: 英语
中文关键词: Alum Shale ; core scanning XRF ; cyclostratigraphy ; Earth–Moon distance ; Furongian ; SPICE event
英文关键词: Circuit simulation ; Climate change ; Drills ; Infill drilling ; Moon ; Sea level ; Shale ; Stratigraphy ; Carbon isotope excursions ; Eccentricity cycle ; Elemental abundance ; Eustatic sea level ; Milankovitch cycle ; Scanning XRF analysis ; Sedimentation rates ; Shale formation ; Core drilling ; Cambrian ; climate change ; Milankovitch cycle ; Moon ; sea level change ; shale ; X-ray fluorescence
英文摘要: We report evidence for Milankovitch cycles in two drill cores from the Cambro–Ordovician Alum Shale Formation of Scandinavia. The signal is preserved in elemental abundances recorded at high stratigraphic resolution by core scanning XRF analysis (0.2 mm resolution). The new data enable us to establish a floating timeline calibrated to the stable 405 kyr eccentricity cycle for a ∼8.7 Myr interval across the Miaolingian–Furongian boundary. This interval spans the Steptoean Positive Carbon Isotope Excursion (SPICE), which is recorded in the δ13Corg in the studied drill cores. We calculate the durations of the Olenus Superzone to 3.4 ± 0.2 Myr, the Parabolina Superzone to 1.9 ± 0.3 Myr, the Leptoplastus Superzone to 0.33 ± 0.18 Myr, the Protopeltura Superzone to 0.51 ± 0.20 Myr, and the SPICE event straddling the Paibian and lower main part of the Jiangshanian Stage to 3.0 ± 0.2 Myr. The sedimentation rate shows similar trends at both drilling locations and is inversely correlated to eustatic sea level changes in certain time intervals, opening tantalizing new prospects of using cyclostratigraphic analyses of shales to track eustatic sea level variations. The identification of obliquity cycles enables us to calculate the Cambrian Earth–Moon distance as well as the day length at ∼493 Ma to 368.9 ± 2.3 ⋅ 106 m and 21.78 ± 0.29 hr, respectively. © 2020 Elsevier B.V.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165277
Appears in Collections:气候变化与战略

Files in This Item:

There are no files associated with this item.


作者单位: GLOBE Institute, University of Copenhagen, Denmark; Department of Geosciences and Natural Resource Management, University of Copenhagen, Denmark; Geological Survey of Denmark and Greenland (GEUS), Denmark

Recommended Citation:
Sørensen A.L.,Nielsen A.T.,Thibault N.,et al. Astronomically forced climate change in the late Cambrian[J]. Earth and Planetary Science Letters,2020-01-01,548
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Sørensen A.L.]'s Articles
[Nielsen A.T.]'s Articles
[Thibault N.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Sørensen A.L.]'s Articles
[Nielsen A.T.]'s Articles
[Thibault N.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Sørensen A.L.]‘s Articles
[Nielsen A.T.]‘s Articles
[Thibault N.]‘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.