碳硅石(SiC)以捕擄晶形式產(chǎn)于玄武質(zhì)和金伯利質(zhì)巖石中,為揭示深部地幔的C-H-O相互作用提供了新的窗口.碳硅石僅能穩(wěn)定于氧逸度(fO2₎<?IW-6的條件,而巖石圈地幔及相關(guān)熔體卻更加氧化.本研究發(fā)現(xiàn)玄武質(zhì)火山碎屑巖和金伯利巖中的碳硅石包含由Si⁰+Fe₃Si₇±FeSi₂Ti±CaSi₂Al₂±FeSi₂Al₃±CaSi₂構(gòu)成的金屬包裹體,其形態(tài)特征表明它們是捕獲的熔體.碳硅石還包含具有結(jié)晶學(xué)取向且附存H₂+CH₄±CO₂±CO的氣體空洞.這些觀察表明碳硅石結(jié)晶于含有還原性C-H-O組分的金屬熔體(Si-Fe-Ti-C±Al±Ca),富集于巖石圈-軟流圈、地殼-地幔這樣的界面.當(dāng)鎂鐵質(zhì)-超鎂鐵質(zhì)巖漿被持續(xù)注入H₂+CH₄時(shí),巖漿逐步被還原,直至硅化物熔...

【文章頁(yè)數(shù)】：10 頁(yè)

【文章目錄】：
1. Introduction
2. Geological background and samples
3. Analytical methods
4. Results
5. Discussion
    5.1. Crystallization environment of moissanite
    5.2. How was the moissanite generated?
    5.3. Where was the moissanite formed?
    5.4. Generation of moissanite in basaltic volcanic systems,and a kimberlitic analogue
6. Conclusions
Conflict of interest
Appendix A.Supplementary materials
Author contributions
Appendix A.Supplementary materials



本文編號(hào)：3740382