【摘要】：金紅石Zr溫度計(jì)在研究高級(jí)變質(zhì)巖的熱演化過程中可以發(fā)揮重要的作用。而電子探針顯微分析技術(shù)得益于其較小的分析束斑(直徑1~2μm)和適中的轟擊能量,通過合理的實(shí)驗(yàn)條件設(shè)定和儀器參數(shù)設(shè)置,是對(duì)薄片中金紅石Zr含量進(jìn)行原位分析的理想實(shí)驗(yàn)手段。本文中,我們對(duì)俄羅斯白海地區(qū)的太古代榴輝巖-退變榴輝巖中的金紅石Zr含量進(jìn)行了電子探針原位分析,并進(jìn)行了金紅石Zr溫度計(jì)計(jì)算。結(jié)果表明,其中石榴子石包裹體類型(產(chǎn)狀1)金紅石的Zr含量比較穩(wěn)定,主要集中在400×10~(-6)~500×10~(-6)范圍,個(gè)別金紅石顆粒中的Zr含量可以達(dá)到1000×10~(-6);而基質(zhì)后成合晶中(產(chǎn)狀2)金紅石的Zr含量的波動(dòng)范圍則相對(duì)更廣一些(200×10~(-6)~1000×10~(-6)),這可能與后期退變過程中的Zr重置和/或擴(kuò)散有關(guān)�？傮w上,不同產(chǎn)狀金紅石的Zr溫度計(jì)計(jì)算結(jié)果都給出了兩個(gè)主要的溫度區(qū)間:T1=700~750℃和T2=800~850℃。結(jié)合前人對(duì)白海榴輝巖變質(zhì)溫壓條件的研究以及金紅石Zr體系封閉溫度的控制,我們認(rèn)為金紅石Zr溫度計(jì)的計(jì)算結(jié)果區(qū)間T1更有可能代表的是榴輝巖的退變冷卻溫度,而溫度區(qū)間T2則反映的是榴輝巖在抬升過程中受到高溫麻粒巖相變質(zhì)作用階段的溫度峰期條件。
[Abstract]:Rutile Zr thermometer can play an important role in the study of thermal evolution of advanced metamorphic rocks. The electron probe microanalysis technique benefits from its small analytical beam spot (diameter 1 ~ 2 渭 m) and moderate bombardment energy. Through reasonable experimental condition setting and instrument parameter setting, it is an ideal experimental method for in situ analysis of rutile Zr content in thin sheet. In this paper, the Zr content of rutile in Archean eclogite-degenerative eclogite in Baihai area of Russia is analyzed by electron probe in situ, and the rutile Zr thermometer is calculated. The results show that the Zr content of garnet inclusions (occurrence 1) rutile is relatively stable, mainly concentrated in the range of 400 脳 10 ~ (- 6) ~ 500 脳 10 ~ (- 6), and the Zr content in individual rutile particles can reach 1000 脳 10 ~ (- 6). However, the fluctuation range of Zr content in (occurrence 2) rutile is relatively wider (200 脳 10 ~ (- 6) ~ 1000 脳 10 ~ (- 6), which may be related to the replacement and / or diffusion of Zr in the process of late degeneration. Generally speaking, the calculation results of Zr thermometer for different occurrence rutile show two main temperature ranges: T1 鈮，

本文編號(hào)：2499036