本文選題：微量元素　切入點：磁鐵礦　出處：《地球科學進展》2017年03期 　論文類型：期刊論文

【摘要】：激光剝蝕電感耦合等離子體質(zhì)譜(LA-ICP-MS),由于其原位、實時、低檢測限、高空間分辨率等優(yōu)點,在礦物原位微量元素分析方面具有獨特的優(yōu)勢。磁鐵礦作為多種礦床和巖石中的常見礦物,其化學組成一直是國內(nèi)外學者關注的焦點。而大量的研究表明,在磁鐵礦LA-ICP-MS分析過程中,基體效應不明顯,一般采用富鐵硅酸鹽玻璃作為標樣,就能夠取得較為準確的結(jié)果。因此近年來磁鐵礦原位微量元素研究進展迅速,并在反演成巖成礦條件、輔助判別礦床類型和間接指導找礦勘探等方面顯示出廣泛的應用前景。通過總結(jié)25個不同類型巖漿和熱液礦床中磁鐵礦微量元素數(shù)據(jù),與前人在礦床類型判別上的研究進行了一定的對比,發(fā)現(xiàn)常用的磁鐵礦判別圖解可以用來區(qū)分多種不同類型的礦床,但是已經(jīng)劃分出的分類邊界可能需要進一步細化和嚴格驗證,并且事先仔細的巖相學觀察是數(shù)據(jù)解釋的重要基礎。另外,通過磁鐵礦微量元素分配對巖漿和熱液過程一系列復雜物理化學條件(熔/流體成分、溫度、冷卻速率、壓力、氧逸度、硫逸度和二氧化硅活度等)的響應進行了一定探討。在巖漿階段,磁鐵礦成分與熔體組成及分異演化密切相關;而熱液階段,流體性質(zhì)的變化也會顯著改變磁鐵礦的化學成分。并且后期流體的改造或者磁鐵礦的亞固相再平衡作用會對磁鐵礦的成因鑒別產(chǎn)生嚴重干擾。綜述了近年來LA-ICP-MS在磁鐵礦微量元素分析方面的發(fā)展以及在礦床學領域的重要應用,以期對成礦作用和成礦過程研究提供新的思路和方向。
[Abstract]:Laser denudation inductively coupled plasma mass spectrometry (LA-ICP-MS) has the advantages of in-situ, real-time, low detection limit and high spatial resolution. As a common mineral in many kinds of deposits and rocks, the chemical composition of magnetite has always been the focus of attention of scholars at home and abroad. In the process of LA-ICP-MS analysis of magnetite, the matrix effect is not obvious, so it is possible to obtain more accurate results by using ferrosilicate glass as standard sample. Therefore, in recent years, the research on trace elements in situ of magnetite has made rapid progress. It also shows a broad application prospect in inversion of diagenetic and metallogenic conditions, auxiliary discrimination of ore deposit types and indirect guidance for prospecting and exploration. The data of trace elements of magnetite in 25 different types of magma and hydrothermal deposits are summarized. Compared with the previous researches on ore deposit type discrimination, it is found that the commonly used magnetite discriminant diagram can be used to distinguish many different types of deposits. But the classified boundaries that have been delineated may need further refinement and strict verification, and careful petrographic observation in advance is an important basis for data interpretation. A series of complex physical and chemical conditions (melting / fluid composition, temperature, cooling rate, pressure, oxygen fugacity) for magmatic and hydrothermal processes through the distribution of trace elements in magnetite, In the magmatic stage, the composition of magnetite is closely related to the composition and evolution of the melt, while in the hydrothermal stage, the composition of magnetite is closely related to the evolution of melt composition and differentiation, while in hydrothermal stage, the composition of magnetite is closely related to the composition and evolution of the melt. The chemical composition of magnetite will also be significantly changed by the change of fluid properties, and the alteration of fluid or the rebalancing of subsolid phase of magnetite will seriously interfere with the genetic identification of magnetite in recent years. The development of trace element analysis of magnetite and its important application in the field of ore deposit, It is expected to provide new ideas and directions for the study of metallogeny and metallogenic process.
【作者單位】： 中國科學院地質(zhì)與地球物理研究所礦產(chǎn)資源研究重點實驗室;中國科學院大學;
【基金】：國家自然科學基金面上項目“內(nèi)蒙古畢力赫單金斑巖型礦床成礦作用研究”(編號:41572073)資助~~
【分類號】：P575;P611

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本文編號：1636632