Low delta O-18, ultrahigh-P garnet-bearing mafic and ultramafic rocks from Dabie Shan, China
文献类型：期刊论文
| 作者 | Zhang, RY; Rumble, D; Liou, JG; Wang, QC |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 1998-08-24 |
| 卷号 | 150期号:1-2页码:161-170 |
| 关键词 | oxygen isotope in situ analysis UHP ultramafics metasomatism Dabie mountains |
| ISSN号 | 0009-2541 |
| 文献子类 | Article |
| 英文摘要 | The Maowu mafic-ultramafic complex from the Dabie ultrahigh-pressure metamorphic belt of China is enclosed in coesite-bearing gneiss. The complex mainly consists of layered garnet ortho- and clinopyroxenites in addition to minor harzburgite, eclogite and rare omphacitite. The rocks contain pyrope-rich garnet, enstatite, diopside and forsterite and minor clinohumite, magnesite, chromite, rutile, monazite and apatite with rods of monazite. Thermobarometry and coesite inclusions in omphacite constrain peak metamorphism at about 700 +/- 50 degrees C and 40-60 kbar. The delta(18)O (SMOW) values of garnet, olivine, orthopyroxene, clinopyroxene and omphacite from seven samples were determined by in situ analysis with an Ultraviolet Laser Microprobe. Except for omphacite the delta(18)O data define a narrow range between +2.9 and +4.4 per mil; omphacite has the lowest delta(18)O values (+ 1.5 +/- 0.3). Furthermore, fractionation of O-18 and O-16 between coexisting mineral pairs (e.g., Delta Grt-Cpx, Delta Ol-Cpx, and Delta Grt-Opx) is less than +/- 0.5 indicating high-temperature O-isotope equilibrium. High REE contents and extreme LREE-enrichment [(La/Yb)(N) up to 17400] for whole rock, as well as low delta(18)O data of minerals suggest the ultramafic-mafic rocks were metasomatized by a LREE-enriched fluid and reacted with meteoric water at a shallow crustal level prior to ultrahigh-P metamorphism at upper mantle depths. (C) 1998 Elsevier Science B.V. All rights reserved. |
| WOS关键词 | PRESSURE METAMORPHIC ROCKS ; BOUSERA PERIDOTITE MASSIF ; OXYGEN-ISOTOPE ANALYSIS ; NORTH MOROCCO ; COESITE ; ECLOGITES ; MOUNTAINS ; DIAMOND ; PETROGENESIS ; MANTLE |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000076069000009 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/75068]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Rumble, D |
| 作者单位 | 1.Carnegie Inst Washington, Geophys Lab, Washington, DC 20015 USA 2.Stanford Univ, Dept Geol & Environm Sci, Stanford, CA 94305 USA 3.Chinese Acad Sci, Inst Geol, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, RY,Rumble, D,Liou, JG,et al. Low delta O-18, ultrahigh-P garnet-bearing mafic and ultramafic rocks from Dabie Shan, China[J]. CHEMICAL GEOLOGY,1998,150(1-2):161-170. |
| APA | Zhang, RY,Rumble, D,Liou, JG,&Wang, QC.(1998).Low delta O-18, ultrahigh-P garnet-bearing mafic and ultramafic rocks from Dabie Shan, China.CHEMICAL GEOLOGY,150(1-2),161-170. |
| MLA | Zhang, RY,et al."Low delta O-18, ultrahigh-P garnet-bearing mafic and ultramafic rocks from Dabie Shan, China".CHEMICAL GEOLOGY 150.1-2(1998):161-170. |
入库方式： OAI收割
来源：地质与地球物理研究所
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