Geomagnetic paleointensity and direct age determination of the ISEA (M0r?) chron
文献类型：期刊论文
| 作者 | Zhu, RX; Hoffman, KA; Nomade, S; Renne, PR; Shi, RP; Pan, YX; Shi, GH |
| 刊名 | EARTH AND PLANETARY SCIENCE LETTERS
 |
| 出版日期 | 2004-01-15 |
| 卷号 | 217期号:3-4页码:285-295 |
| 关键词 | paleointensities Ar-40/Ar-39 dating ISEA (or M0r) China andesite |
| ISSN号 | 0012-821X |
| DOI | 10.1016/S0012-821X(03)00613-7 |
| 文献子类 | Article |
| 英文摘要 | A combined paleomagnetic and geochronologic study has been conducted on an andesite lava sequence at Jianguo (Liaoning province, northeastern China). Thermal demagnetization and thermomagnetic analysis revealed that natural remanent magnetization is carried by both magnetite and hematite. Stepwise thermal demagnetization up to 675degreesC isolated well-defined reverse characteristic remanent magnetization (ChRM) in three time-independent lava flows with a mean direction of D/I= 179.2degrees/-59.7degrees with alpha(95) = 3.0degrees. It also showed that a high-temperature component (> 585degreesC) has the same ChRM direction as that of the low- to medium-temperature (ca. 170/300-585degreesC) components. A modified version of the Thellier-Thellier paleointensity method [Coe, J. Geophys. Res. 72 (1967) 3247-3262] with systematic partial thermoremanent magnetization checks was used for palcointensity determinations. Twelve out of 39 samples yielded reliable results in the temperature interval of 170-550degreesC. Virtual dipole moment values range from 3.9 to 4.7 x 10(22) Am-2 with an average of 4.2 +/- 0.1 x 10(22) Am-2. Ar-40/Ar-39 age determination on one lava flow is 116.8 +/- 3.0 Myr (2sigma error, relative to Fish Canyon sanicline: 28.02 +/- 0.28 Myr). The magnetic reversed polarity with well-defined age could correspond to the 'ISEA' within the older part of the Cretaceous normal superchron (CNS), but we cannot rule out the possibility that this reversal interval could also correspond to the M0r due to many ambiguities on previous published ages on ISEA and M0r intervals as well as the new monitor age correction we applied. It also suggests that a weak magnetic field nature already documented before the CNS extended at least into the very beginning of the CNS. (C) 2003 Elsevier B.V. All rights reserved. |
| WOS关键词 | CRETACEOUS NORMAL SUPERCHRON ; EARTHS MAGNETIC-FIELD ; PALEOMAGNETIC DATA ; POLARITY INTERVAL ; DECAY CONSTANTS ; INTENSITY ; ROCKS ; REVERSALS ; HAWAII ; CHINA |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000188219700005 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/79677]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Zhu, RX |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Lab Paleomagnetism, Beijing 100029, Peoples R China 2.California Polytech State University San Luis Obis, San Luis Obispo, CA 93410 USA 3.Berkeley Geochronol Ctr, Berkeley, CA 94709 USA 4.Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA |
| 推荐引用方式 GB/T 7714 | Zhu, RX,Hoffman, KA,Nomade, S,et al. Geomagnetic paleointensity and direct age determination of the ISEA (M0r?) chron[J]. EARTH AND PLANETARY SCIENCE LETTERS,2004,217(3-4):285-295. |
| APA | Zhu, RX.,Hoffman, KA.,Nomade, S.,Renne, PR.,Shi, RP.,...&Shi, GH.(2004).Geomagnetic paleointensity and direct age determination of the ISEA (M0r?) chron.EARTH AND PLANETARY SCIENCE LETTERS,217(3-4),285-295. |
| MLA | Zhu, RX,et al."Geomagnetic paleointensity and direct age determination of the ISEA (M0r?) chron".EARTH AND PLANETARY SCIENCE LETTERS 217.3-4(2004):285-295. |
入库方式： OAI收割
来源：地质与地球物理研究所
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