气候变化领域集成服务门户(CCPortal): Frequent Polarity Reversals in the Cretaceous Normal Superchron

CCPortal

DOI	10.1029/2020GL091501
	Frequent Polarity Reversals in the Cretaceous Normal Superchron
	Zhang, Dawen; Yan, Maodu; Song, Chunhui; Zhang, Weilin; Fang, Xiaomin; Li, Bingshuai
通讯作者	Yan, MD (通讯作者)
发表日期	2021
ISSN	0094-8276
EISSN	1944-8007
卷号	48 期号:5
英文摘要	The Cretaceous Normal Superchron (CNS), defined as a magnetic quiet zone spanning from similar to 126 to similar to 84 Myr, is often used to understand the Earth's geodynamo processes. However, whether there were polarity reversals within the CNS remains contentious. This paper presents the youngest detrital zircon U-Pb age-constrained magnetostratigraphic study of the Cretaceous Khorat Group for two sections (i.e., Ban Phonngam (BP) and Ban Nongpen (BN)) in Vientiane, Laos. Both sections are characterized by the prominent long normal-polarity zones that are correlated to the CNS. Interestingly, six (four) short primary reversed horizons were identified within the BP (BN) section. Integrated with other reported reversed events, there likely at least five globally and two single reported reversed-polarity events or clusters of events have happened within the CNS. The confirmation of frequent reversed polarities within the two parallel sections will provide a new comprehensive understanding of the Earth's geodynamic behavior during the CNS.
关键词	GEOMAGNETIC SECULAR VARIATION EARTHS MAGNETIC-FIELD INDO-CHINA PALEOSECULAR VARIATION KHORAT PLATEAU MANTLE GEODYNAMO CORE PALEOINTENSITY BASIN
英文关键词	Cretaceous Normal Superchron; Khorat Group; magnetostratigraphy; polarity reversals; Vientiane Basin
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000627892100020
来源期刊	GEOPHYSICAL RESEARCH LETTERS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260419
推荐引用方式 GB/T 7714	Zhang, Dawen,Yan, Maodu,Song, Chunhui,et al. Frequent Polarity Reversals in the Cretaceous Normal Superchron[J]. 中国科学院青藏高原研究所,2021,48(5).
APA	Zhang, Dawen,Yan, Maodu,Song, Chunhui,Zhang, Weilin,Fang, Xiaomin,&Li, Bingshuai.(2021).Frequent Polarity Reversals in the Cretaceous Normal Superchron.GEOPHYSICAL RESEARCH LETTERS,48(5).
MLA	Zhang, Dawen,et al."Frequent Polarity Reversals in the Cretaceous Normal Superchron".GEOPHYSICAL RESEARCH LETTERS 48.5(2021).