Origin of EL3 chondrites: Evidence for variable C/O ratios during their course of formationA state of the art scrutiny
文献类型：期刊论文
| 作者 | El Goresy, A.1; Lin, Y.2; Miyahara, M.3; Gannoun, A.4; Boyet, M.4; Ohtani, E.5; Gillet, P.6; Trieloff, M.7; Simionovici, A.8; Feng, L.2 |
| 刊名 | METEORITICS & PLANETARY SCIENCE
 |
| 出版日期 | 2017-05-01 |
| 卷号 | 52期号:5页码:781-806 |
| ISSN号 | 1086-9379 |
| DOI | 10.1111/maps.12832 |
| 文献子类 | Article |
| 英文摘要 | Mineral inventories of enstatite chondrites; (EH and EL) are strictly dictated by combined parameters mainly very low dual oxygen (fO(2)) and sulfur (fS(2)) fugacities. They are best preserved in the Almahata Sitta MS-17, MS-177 fragments, and the ALHA 77295 and MAC 88136 Antarctic meteorites. These conditions induce a stark change of the geochemical behavior of nominally lithophile elements to chalcophile or even siderophile and changes in the elemental partitioning thus leading to formation of unusual mineral assemblages with high abundance of exotic sulfide species and enrichment in the metallic alloys, for example, silicides and phosphides. Origin and mode of formation of these exotic chondrites, and their parental source regions could be best scrutinized by multitask research experiments of the most primitive members covering mineralogical, petrological, cosmochemical, and indispensably short-lived isotopic chronology. The magnitude of temperature and pressure prevailed during their formation in their source regions could eventually be reasonably estimated: pre- and postaccretionary could eventually be deduced. The dual low fugacities are regulated by the carbon to oxygen ratios estimated to be >0.83 and <1.03. These parameters not only induce unusual geochemical behavior of the elements inverting many nominally lithophile elements to chalcophile or even siderophile or anthracophile. Structure and mineral inventories in EL3 and EH3 chondrites are fundamentally different. Yet EH3 and EL3 members store crucial information relevant to eventual source regions and importantly possible variation in C/O ratio in the course of their evolution. EL3 and EH3 chondrites contain trichotomous lithologies (1) chondrules and their fragments, (2) polygonal enstatite-dominated objects, and (3) multiphase metal-rich nodules. Mineralogical and cosmochemical inventories of lithologies in the same EL3 indicate not only similarities (REE inventory and anomalies in oldhamite) but also distinct differences (sinoite-enstatite-graphite relationship). Oldhamite in chondrules and polygonal fragments in EL3 depict negative Eu anomaly attesting a common cosmochemical source. Metal-dominated nodules in both EL3 and EH3 are conglomerates of metal clasts and sulfide fragments in EH3 and concentrically zoned C-bearing metal micropebbles (25m 50m) in EL3 thus manifesting a frozen in unique primordial accretionary metal texture and composition. Sinoite-enstatite-diopside-graphite textures reveal a nucleation and growth strongly suggestive of fluctuating C/O ratio during their nucleation and growth in the source regions. Mineral inventories, sulfide phase relations, sinoite-enstatite-graphite intergrowth, carbon and nitrogen isotopic compositions of graphite, spatial nitrogen abundance in graphite in metal nodules, and last but not least I-129/Xe-129 and Mn-53/Cr-53 systematics negate any previously suggested melting episode, pre-accretionary or dynamic, in parental asteroids. |
| WOS关键词 | UNEQUILIBRATED ENSTATITE CHONDRITES ; THERMAL HISTORIES ; EH-CHONDRITES ; OLDHAMITE ; SITTA ; NININGERITE ; CHONDRULES ; CHEMISTRY ; MATRIX ; CARBON |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000401720000001 |
| 出版者 | WILEY |
| 资助机构 | Natural Science Foundation of China(41273077 ; Ecole Polytechnique Federale de Lausanne, Switzerland ; Klaus Tschira Stiftung ; 41521062) ; Natural Science Foundation of China(41273077 ; Ecole Polytechnique Federale de Lausanne, Switzerland ; Klaus Tschira Stiftung ; 41521062) ; Natural Science Foundation of China(41273077 ; Ecole Polytechnique Federale de Lausanne, Switzerland ; Klaus Tschira Stiftung ; 41521062) ; Natural Science Foundation of China(41273077 ; Ecole Polytechnique Federale de Lausanne, Switzerland ; Klaus Tschira Stiftung ; 41521062) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/52930]  |
| 专题 | 地质与地球物理研究所_中国科学院地球与行星物理重点实验室 |
| 通讯作者 | El Goresy, A. |
| 作者单位 | 1.Univ Bayreuth, Bayer Geoinst, D-95447 Bayreuth, Germany 2.Chinese Acad Sci, Key Lab Earth & Planetary Phys, Inst Geol & Geophys, Beijing, Peoples R China 3.Hiroshima Univ, Dept Earth & Planetary Syst Sci, Grad Sch Sci, Higashihiroshima 7398526, Japan 4.CNRS, UMR 6524, LMV, F-63038 Clermont Ferrand, France 5.Tohoku Univ, Dept Earth Sci, Grad Sch Sci, Sendai, Miyagi 9808578, Japan 6.Ecole Polytech Fed Lausanne, CH-1015 Lausanne, Switzerland 7.Heidelberg Univ, Klaus Tschira Lab Kosmochem, Inst Geowissensch, D-69126 Heidelberg, Germany 8.Univ Grenoble, UGA CNRS, ISTerre, Observ Sci, CS 40700, F-38058 Grenoble 9, France 9.Ecole Normale Super Lyon, LGL TPE, CNRS, UMR 5570, F-69364 Lyon, France |
| 推荐引用方式 GB/T 7714 | El Goresy, A.,Lin, Y.,Miyahara, M.,et al. Origin of EL3 chondrites: Evidence for variable C/O ratios during their course of formationA state of the art scrutiny[J]. METEORITICS & PLANETARY SCIENCE,2017,52(5):781-806. |
| APA | El Goresy, A..,Lin, Y..,Miyahara, M..,Gannoun, A..,Boyet, M..,...&Lemelle, L..(2017).Origin of EL3 chondrites: Evidence for variable C/O ratios during their course of formationA state of the art scrutiny.METEORITICS & PLANETARY SCIENCE,52(5),781-806. |
| MLA | El Goresy, A.,et al."Origin of EL3 chondrites: Evidence for variable C/O ratios during their course of formationA state of the art scrutiny".METEORITICS & PLANETARY SCIENCE 52.5(2017):781-806. |
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。