【摘要】：近年來(lái)隨著質(zhì)譜和分析技術(shù)的進(jìn)步,Ca同位素的分析精度獲得了很大的提高,出現(xiàn)了很多高溫條件下Ca同位素地球化學(xué)的研究成果。雙稀釋劑的合理使用在Ca同位素的分析中起關(guān)鍵作用。本文系統(tǒng)地闡述了前人對(duì)Ca同位素測(cè)試時(shí)所使用的雙稀釋劑技術(shù),提供相應(yīng)的計(jì)算程序,并且系統(tǒng)地歸納近年來(lái)高溫條件下Ca同位素地球化學(xué)研究的新成果,包括單礦物對(duì)之間Ca同位素的分餾、隕石和地幔Ca同位素組成的不均一性和隕石的εCa異常及K-Ca定年等。斜方輝石和橄欖石相比于共生的單斜輝石更富集重Ca同位素,并且Δ44/40 CaOpx-Cpx受斜方輝石Ca含量和Ca—O鍵長(zhǎng)的影響。地幔礦物之間具有不相同的Ca同位素組成說(shuō)明地幔Ca同位素組成的不均一性。隕石及其內(nèi)部難熔包裹體的Ca同位素組成變化范圍很大,并且普遍存在εCa的異常。頑火輝石球粒隕石與地球具有相近的Ca同位素組成,表明它們可能具有相同的起源。但是高溫條件下Ca同位素的分餾研究仍處于起步階段,未來(lái)對(duì)于地球主要儲(chǔ)庫(kù)的Ca同位素組成、巖漿過(guò)程(部分熔融和分離結(jié)晶)和洋殼俯沖過(guò)程的Ca同位素分餾仍然需要更多地研究。
[Abstract]:In recent years, with the progress of mass spectrometry and analytical technology, the analysis accuracy of Ca isotopes has been greatly improved, and a lot of research results of Ca isotopic geochemistry at high temperature have appeared. The rational use of double diluents plays a key role in the analysis of Ca isotopes. In this paper, the double diluent techniques used in Ca isotopic testing are systematically described, and the corresponding calculation programs are provided, and the new results of Ca isotopic geochemistry under high temperature conditions in recent years are systematically summarized, including the fractionation of Ca isotopes between single mineral pairs, the heterogeneity of Ca isotopic composition between meteorite and mantle, the 蔚 Ca anomaly of meteorite and K-Ca dating, and so on. Compared with the symbiotic clinopyroxene and olivine, clinopyroxene and olivine are more abundant in Ca isotopes, and 螖 44 鈮，

本文編號(hào)：2515741