Thermal and petrological structure of the lithosphere beneath Hannuoba, Sino-Korean Craton, China: evidence from xenoliths
文献类型：期刊论文
| 作者 | Chen, SH; O'Reilly, SY; Zhou, XH; Griffin, WL; Zhang, GH; Sun, M; Feng, JL; Zhang, M |
| 刊名 | LITHOS
 |
| 出版日期 | 2001-04-01 |
| 卷号 | 56期号:4页码:267-301 |
| 关键词 | mantle xenoliths Sino-Korean Craton Eastern China lithosphere mantle trace elements granulite xenoliths Hannuoba lithosphere structure |
| ISSN号 | 0024-4937 |
| 文献子类 | Article |
| 英文摘要 | Deep-seated xenoliths entrained in the Hannuoba basalts of the northern Sino-Korean Craton include mafic and felsic granulites, mantle wall-rock from spinel- and garnet-spinel peridotite facies, and basaltic crystallisation products from the spinel-pyroxenite and garnet-pyroxenite stability fields. The mineral compositions of the xenoliths have been used to estimate temperatures and, when possible, pressures of equilibration. and to construct a geothermal framework to interpret the upper mantle and lower crustal rock-type sequences for the region. The xenolith-derived paleogeotherm is constrained in the depth interval of 45-65 km and like others from areas of young basalt magmatism. is elevated and strongly convex toward the temperature axis. Two-pyroxene granulites give the lowest temperatures and garnet pyroxenites the highest. while the spinel lherzolites fall between these two groups. The present-day Moho beneath the Hannuoba area is defined at 42 km by seismic data, and coincides with the deepest occurrence of granulite. Above this boundary, there is a lower crust-upper mantle transition zone about 10-km thick, in which spinel lherzolites and mafic granulites (with variable plagioclase contents) are intermixed. It is inferred that this underplating has resulted in a lowering of the original pre-Cenozoic Moho (then coinciding with the crust-mantle boundary, CMB) from about 30 km to its present-day position and was due to intrusions of basaltic magmas that displaced peridotite mantle wall-rock and equilibrated to mafic granulites. Trace element patterns of the diopsides (analysed by laser ablation-ICPMS) from the Cr-diopside series spinel lherzolites and associated layered xenoliths (spinel lherzolites and pyroxenites) indicate 3 fertile uppermost mantle with moderate depletion by low degrees of partial melting and little evidence of metasomatic activity. The similarity in major and trace element composition?; of the minerals in both rock types suggests that the layered ultramafic xenoliths formed by mantle deformation processes (metamorphic segregation), rather than by melt veining or metasomatism. (C) 2001 Elsevier Science B.V. All rights reserved. |
| WOS关键词 | CRUST-MANTLE BOUNDARY ; LASER-ABLATION ICPMS ; ULTRAMAFIC XENOLITHS ; TRACE-ELEMENTS ; ORTHO-PYROXENE ; EASTERN CHINA ; SOUTHEASTERN AUSTRALIA ; PERIDOTITE XENOLITHS ; 4-PHASE LHERZOLITES ; SPINEL PERIDOTITE |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000168372300001 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/76452]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | O'Reilly, SY |
| 作者单位 | 1.Macquarie Univ, Dept Earth & Planetary Sci, GEMOC, N Ryde, NSW 2109, Australia 2.Chinese Acad Sci, Inst Geol & Geophys, Lab Lithosphere Tecton Evolut, Beijing 100029, Peoples R China 3.CSIRO Explorat & Min, N Ryde, NSW 1670, Australia 4.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China 5.Hebei Coll Geol, Dept Geol, Shijiazhuang 050031, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, SH,O'Reilly, SY,Zhou, XH,et al. Thermal and petrological structure of the lithosphere beneath Hannuoba, Sino-Korean Craton, China: evidence from xenoliths[J]. LITHOS,2001,56(4):267-301. |
| APA | Chen, SH.,O'Reilly, SY.,Zhou, XH.,Griffin, WL.,Zhang, GH.,...&Zhang, M.(2001).Thermal and petrological structure of the lithosphere beneath Hannuoba, Sino-Korean Craton, China: evidence from xenoliths.LITHOS,56(4),267-301. |
| MLA | Chen, SH,et al."Thermal and petrological structure of the lithosphere beneath Hannuoba, Sino-Korean Craton, China: evidence from xenoliths".LITHOS 56.4(2001):267-301. |
入库方式： OAI收割
来源：地质与地球物理研究所
浏览0
下载0
收藏0
其他版本
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。