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DOI | 10.1111/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
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ISSN | 0956-540X |
EISSN | 1365-246X |
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. |
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