Constraints on the origin of historic potassic basalts from northeast China by U-Th disequilibrium data
文献类型：期刊论文
| 作者 | Zou, HB; Reid, MR; Liu, YS; Yao, YP; Xu, XS; Fan, QC |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2003-10-16 |
| 卷号 | 200期号:1-2页码:189-201 |
| 关键词 | historic basalts mantle melting mantle metasomatism basalt isotopes basalt trace elements china basalts |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/S0009-2541(03)00188-8 |
| 文献子类 | Article |
| 英文摘要 | The only historic eruptions of potassic basalts on the Earth reported so far took place in 1719-1721 AD in the Wudalianchi area of northeast China. These historic potassic basalts are characterized by significant Th-230 excesses [(Th-230/U-238) = 1.24-1.33], and low Nd-143/Nd-144 (epsilon(Nd) = - 5.0 to -3.7) and Pb-206/Pb-204 (16.8-17.1). Strong Th-230 excesses, low CaO + Al2O3, and large bulk partition coefficients (D) in Rb, K, and Zr (D-Rb congruent to D-K>D-Zr>D-Zr>D-Sm) inferred from a melt-normalized spider diagram suggest phlogopite-bearing garnet peridotites as dominant source rocks. The presence of garnet peridotites as mantle source, combined with negative epsilon(Nd) in basalts and the geophysically determined lithosphere thickness in the study region (120 km), indicates the generation of these basalts at the depth of 80-120 km in the subcontinental lithospheric mantle. Dynamic melting inversion (DMI) of between-magma trace element concentration ratios and U-Th disequilibrium data suggests low-degree partial melting (5-7%) of a slow upwelling (< 1.6 cm/year) mantle source, although extremely low-degree batch partial melting (0.3-0.5%) of a static source is also possible. Source Nd model ages suggest that the source rocks for the Wudalianchi basalts were metasomatized at 1.0 Ga, provided that it has not experienced multistage enrichment history. Lithospheric extension since late Tertiary in the study region was responsible for slow decompression melting of phlogopite-bearing garnet peridotites in deep subcontinental lithospheric mantle. Recent (< 350 ka) subduction of the Pacific Plate may have produced lithospheric extension in the study region, but did not directly contribute subduction-related fluids to the source rocks for these potassic basalts because Th-230 enrichments are uncharacteristic of melts generated by subduction. The subducted slab may have lost fluids released from subducted sediments before the slab can reach the mantle beneath NE China. (C) 2003 Elsevier Science B.V. All rights reserved. |
| WOS关键词 | SUBCONTINENTAL LITHOSPHERIC MANTLE ; U-235 PA-231 DISEQUILIBRIA ; TRACE-ELEMENT ; VOLCANIC-ROCKS ; ISOTOPE EVIDENCE ; EASTERN CHINA ; MAJOR-ELEMENT ; TH-230-U-238 DISEQUILIBRIUM ; SERIES DISEQUILIBRIUM ; CENOZOIC BASALTS |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000184511700013 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/78225]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Zou, HB |
| 作者单位 | 1.Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90095 USA 2.Beijing Normal Univ, Dept Geog, Beijing 100037, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 4.Nanjing Univ, Dept Earth Sci, Nanjing 210093, Peoples R China 5.State Seismol Bur, Inst Geol, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zou, HB,Reid, MR,Liu, YS,et al. Constraints on the origin of historic potassic basalts from northeast China by U-Th disequilibrium data[J]. CHEMICAL GEOLOGY,2003,200(1-2):189-201. |
| APA | Zou, HB,Reid, MR,Liu, YS,Yao, YP,Xu, XS,&Fan, QC.(2003).Constraints on the origin of historic potassic basalts from northeast China by U-Th disequilibrium data.CHEMICAL GEOLOGY,200(1-2),189-201. |
| MLA | Zou, HB,et al."Constraints on the origin of historic potassic basalts from northeast China by U-Th disequilibrium data".CHEMICAL GEOLOGY 200.1-2(2003):189-201. |
入库方式： OAI收割
来源：地质与地球物理研究所
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