Arid
DOI10.1111/j.1365-246X.2007.03619.x
Palaeomagnetic results from Palaeocene basalts from Mongolia reveal no inclination shallowing at 60 Ma in Central Asia
Hankard, Fatim1; Cogne, Jean-Pascal1; Lagroix, France1; Quidelleur, Xavier2; Kravchinsky, Vadim A.1; Bayasgalan, Amgalan3; Lkhagvadorj, Purevdorj3
通讯作者Hankard, Fatim
来源期刊GEOPHYSICAL JOURNAL INTERNATIONAL
ISSN0956-540X
EISSN1365-246X
出版年2008
卷号172期号:1页码:87-102
英文摘要

We present the results of a palaeomagnetic study of 277 cores drilled at 35 sites, in 32 basaltic flows from three Early Palaeocene volcanic regions in the Gobi Desert, Mongolia, at Sumber Uul (62.2 Ma; 42.6 degrees N/104.0 degrees E), Tulga (62.0 Ma; 43.2 degrees N/104.1 degrees E) and Khuts Uul (57.1 Ma; 43.2 degrees N/104.6 degrees E) localities. Samples from Sumber Uul (62.2 +/- 0.9 Ma) and Khuts Uul (57.1 +/- 0.8 Ma) localities were dated using the K-Ar Cassignol-Gillot technique. Stepwise thermal and alternating field demagnetizations isolated a stable A component of magnetization carried by single domain (SD) to nearly SD magnetite. We interpret this A component to be the primary magnetization of these basaltic lava flows.The Sumber Uul and Tulga data were combined and recomputed at the Sumber Uul locality because of their similar ages. The palaeopoles computed from the A components lie at lambda 85.2 degrees N, phi= 92.5 degrees E, dp/dm = 3.9/4.9 (n = 14 flows) for Sumber Uul-Tulga (average age: 62.1 +/- 5.9 Ma) and lambda = 69.6 degrees N, phi = 148.0 degrees E, dp/dm = 6.3/7.3 (n = 14 flows) for Khuts Uul (average age: 57.1 +/- 0.8 Ma). The palaeomagnetic inclinations are steeper than expected at the sites and consequently our palaeopoles occupy a near-sided position with respect to the 60 Ma reference apparent polar wander path (APWP) pole for Europe (Besse & Courtillot 2002). However, they appear to fully conform to the new high-resolution APWP poles for the 65-42 Ma period of Moreau et al. (2007). Following these authors, we interpret this anomalous near-sided position of our poles as arising from a rapid true polar wander (TPW) event in the Palaeocene, highlighted by a cusp at anomalies 26-25 (61-56 Ma), inexistent in the European APWP of Besse & Courtillot (2002). We conclude that our new data do not reveal any anomalous shallow inclinations in the Central Asia Palaeocene effusive rocks which is consistent with the Late Jurassic/Early Cretaceous age of Mongol-Okhotsk ocean closure and amalgamation of Amuria and Siberia, forming a rigid entity since then.


英文关键词palaeomagnetism applied to tectonics rock and mineral magnetism Asia
类型Article
语种英语
国家France ; Mongolia
收录类别SCI-E
WOS记录号WOS:000251669800008
WOS关键词POLAR WANDER PATH ; TIEN-SHAN ; SOUTH CHINA ; TARIM BASIN ; RED BEDS ; REMAGNETIZATION CIRCLES ; CENOZOIC TECTONICS ; SEDIMENTARY-ROCKS ; OKHOTSK OCEAN ; GUIDE BASIN
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/157469
作者单位1.Univ Paris 07, Inst Phys Globe Paris, Lab Paleomagnetisme, F-75252 Paris 05, France;
2.Univ Paris 11, Lab Geochronol Multitech UPS IPGP, F-91405 Orsay, France;
3.Mongolian Univ Sci & Technol, Ulaanbaatar 210349, Mongolia
推荐引用方式
GB/T 7714
Hankard, Fatim,Cogne, Jean-Pascal,Lagroix, France,et al. Palaeomagnetic results from Palaeocene basalts from Mongolia reveal no inclination shallowing at 60 Ma in Central Asia[J],2008,172(1):87-102.
APA Hankard, Fatim.,Cogne, Jean-Pascal.,Lagroix, France.,Quidelleur, Xavier.,Kravchinsky, Vadim A..,...&Lkhagvadorj, Purevdorj.(2008).Palaeomagnetic results from Palaeocene basalts from Mongolia reveal no inclination shallowing at 60 Ma in Central Asia.GEOPHYSICAL JOURNAL INTERNATIONAL,172(1),87-102.
MLA Hankard, Fatim,et al."Palaeomagnetic results from Palaeocene basalts from Mongolia reveal no inclination shallowing at 60 Ma in Central Asia".GEOPHYSICAL JOURNAL INTERNATIONAL 172.1(2008):87-102.
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Hankard, Fatim]的文章
[Cogne, Jean-Pascal]的文章
[Lagroix, France]的文章
百度学术
百度学术中相似的文章
[Hankard, Fatim]的文章
[Cogne, Jean-Pascal]的文章
[Lagroix, France]的文章
必应学术
必应学术中相似的文章
[Hankard, Fatim]的文章
[Cogne, Jean-Pascal]的文章
[Lagroix, France]的文章
相关权益政策
暂无数据
收藏/分享

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。