Petrogrenesis of the Maowu pyroxenite-eclogite body from the UHP metamorphic terrane of Dabieshan: chemical and isotopic constraints
文献类型：期刊论文
| 作者 | Jahn, BM; Fan, QC; Yang, JJ; Henin, O |
| 刊名 | LITHOS
 |
| 出版日期 | 2003-10-01 |
| 卷号 | 70期号:3-4页码:243-267 |
| 关键词 | dabieshan Maowu UHP metamorphism eclogite pyroxenite Sm-Nd isotopes age |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/S0024-4937(03)00101-4 |
| 文献子类 | Article |
| 英文摘要 | The Maowu eclogite-pyroxenite body is a small (250 x 50 m) layered intrusion that occurs in the ultra-high-pressure (UHP) metamorphic terrane of Dabieshan, China. Like the adjacent Bixiling complex, the Maowu intrusion was initially emplaced at a crustal level, then subducted along with the country gneisses to mantle depths and underwent UHP metamorphism during the collision of the North and South China Blocks in the Triassic. This paper presents the results of a geochemical and isotopic investigation on the metamorphosed Maowu body. The Maowu intrusion has undergone open system chemical and isotopic behavior three times. Early crustal contamination during magmatic differentiation is manifested by high initial Sr-87/Sr-86 ratios (0.707-0.708) and inhomogeneous negative epsilon(Nd)(T) values of -3 to -10 at 500 Ma (probable protolith age). Post-magmatic and pre-UHP metamorphic metasomatism is indicated by sinusoidal REE patterns of garnet orthopyroxenites, lack of whole-rock (WR) Sm-Nd isochronal relationship, low delta(18)O values and an extreme enrichment of Th and REE in a clinopyroxenite. Finally, K and Rb depletion during UHP metamorphism is deduced from the high initial Sr-87/Sr-86 ratios unsupported by in situ Rb/Sr ratios. Laser ICP-MS spot analyses on mineral grains show that (1) Grt and Cpx attained chemical equilibrium during UHP metamorphism, (2) Cpx/Grt partition coefficients for REE correlate with Ca, and (3) LREE abundances in whole rocks are not balanced by that of the principal phases (Grt and Cpx), implying that the presence of LREE-rich accessory phases, such as monazite and apatite, is required to account for the REE budget. |
| WOS关键词 | ULTRAHIGH-PRESSURE METAMORPHISM ; COESITE-BEARING ECLOGITES ; EAST-CENTRAL CHINA ; TRACE-ELEMENT DISTRIBUTION ; SM-ND ; RB-SR ; YANGTZE CRATONS ; LOW DELTA-O-18 ; ZIRCON AGES ; SHAN |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000186356500011 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/78849]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Jahn, BM |
| 作者单位 | 1.Univ Rennes 1, CNRS, UPR 4661, F-35042 Rennes, France 2.State Seismol Bur, Inst Geol, Beijing 100029, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Jahn, BM,Fan, QC,Yang, JJ,et al. Petrogrenesis of the Maowu pyroxenite-eclogite body from the UHP metamorphic terrane of Dabieshan: chemical and isotopic constraints[J]. LITHOS,2003,70(3-4):243-267. |
| APA | Jahn, BM,Fan, QC,Yang, JJ,&Henin, O.(2003).Petrogrenesis of the Maowu pyroxenite-eclogite body from the UHP metamorphic terrane of Dabieshan: chemical and isotopic constraints.LITHOS,70(3-4),243-267. |
| MLA | Jahn, BM,et al."Petrogrenesis of the Maowu pyroxenite-eclogite body from the UHP metamorphic terrane of Dabieshan: chemical and isotopic constraints".LITHOS 70.3-4(2003):243-267. |
入库方式： OAI收割
来源：地质与地球物理研究所
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