Experimental determination of Si, Mg, and Ca isotope fractionation during enstatite melt evaporation
文献类型：期刊论文
| 作者 | Lu, Wenhua3,4,5; Weber, Richard2; Zhang, Zhaofeng1 ; Li, Yuan4,5
|
| 刊名 | AMERICAN MINERALOGIST
 |
| 出版日期 | 2024-07-26 |
| 卷号 | 109期号:7页码:1193-1202 |
| 关键词 | Enstatite planetary evaporation high-temperature experiments isotopic fractionation Earth's composition |
| ISSN号 | 0003-004X |
| DOI | 10.2138/am-2023-9111 |
| 英文摘要 | Evaporation of silicate materials from Earth or its precursors may be important in shaping their primordial compositions represented by undifferentiated meteorites, e.g., enstatite chondrites; however, the conditions under which evaporation occurs and the extent of evaporation-induced elemental and isotope fractionation remain uncertain. Here, we experimentally determine the volatility and isotope fractionation of Si, Mg, Ca, Nb, and Ta during enstatite melt evaporation at 2423-2623 K using a high-temperature conical nozzle levitator. Homogenous glasses are recovered after experiments; then we use EPMA and LA-ICP-MS to measure the elemental compositions, MC-ICP-MS to measure the Si and Mg isotopes, and TIMS to measure the Ca isotopes. Our results show that the evaporation rates of Si are larger than Mg, and the mean vapor/melt isotope fractionation factors (alpha = R-vapor/R-melt; R = isotope ratio) are 0.99585 +/- 0.00002 for Si-29/Si-28 and 0.98942 +/- 0.00130 for Mg-25/Mg-24. However, neither evaporative loss of Ca, Nb, and Ta nor Ca isotope fractionation was observed within analytical uncertainty. In conjunction with previous studies, we find that in an evaporation experiment the saturation degree (partial vapor pressure/equilibrium vapor pressure) of Si (S-Si) is larger than S-Mg when Si is more volatile than Mg, and vice versa. If the Mg/Ca and Si/Ca ratios and isotopes in the bulk silicate Earth are attributed to the evaporation of enstatite chondrite-like precursors, evaporation temperatures >5000 K and S-Si < S-Mg are required. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:001265587400015 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/78309]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Lu, Wenhua |
| 作者单位 | 1.Chengdu Univ Technol, Coll Geosci, Int Ctr Planetary Sci, Chengdu 610059, Peoples R China 2.Mat Dev Inc, 3090 Daniels Court, Arlington Hts, IL 60004 USA 3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 4.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 5.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lu, Wenhua,Weber, Richard,Zhang, Zhaofeng,et al. Experimental determination of Si, Mg, and Ca isotope fractionation during enstatite melt evaporation[J]. AMERICAN MINERALOGIST,2024,109(7):1193-1202. |
| APA | Lu, Wenhua,Weber, Richard,Zhang, Zhaofeng,&Li, Yuan.(2024).Experimental determination of Si, Mg, and Ca isotope fractionation during enstatite melt evaporation.AMERICAN MINERALOGIST,109(7),1193-1202. |
| MLA | Lu, Wenhua,et al."Experimental determination of Si, Mg, and Ca isotope fractionation during enstatite melt evaporation".AMERICAN MINERALOGIST 109.7(2024):1193-1202. |
入库方式： OAI收割
来源：广州地球化学研究所
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