{"title":"金红石的岩石学和年代学","authors":"T. Zack, E. Kooijman","doi":"10.2138/RMG.2017.83.14","DOIUrl":null,"url":null,"abstract":"Rutile (TiO2) is an important accessory mineral that, when present, offers a rich source of information about the rock units in which it is incorporated. It occurs in a variety of specific microstructural settings, contains significant amounts of several trace elements and is one of the classical minerals used for U–Pb age determination. Here, we focus on information obtainable from rutile in its original textural context. We do not present an exhaustive review on detrital rutile in clastic sediments, but note that an understanding of the petrochronology of rutile in its source rocks will aid interpretation of data obtained from detrital rutile. For further information on the important role of rutile in provenance studies, the reader is referred to previous reviews (e.g., Zack et al. 2004b; Meinhold 2010; Triebold et al. 2012). 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引用次数: 92
摘要
金红石(TiO2)是一种重要的辅助矿物,当它存在时,提供了关于它所包含的岩石单元的丰富信息来源。它存在于各种特定的微观结构环境中,含有大量的几种微量元素,是用于U-Pb年龄测定的经典矿物之一。在这里,我们将重点关注金红石在其原始结构背景下可获得的信息。我们没有对碎屑沉积物中的金红石碎屑进行详尽的回顾,但注意到对其源岩中金红石岩石年代学的理解将有助于解释从金红石碎屑中获得的数据。要进一步了解金红石在种源研究中的重要作用,请参阅以前的综述(例如,Zack等人,2004b;Meinhold 2010;tribold et al. 2012)。除了某些热液环境外,粗金红石是所有地壳和上地幔条件下唯一稳定的TiO2多晶型(Smith et al. 2009)。因此,我们将重点关注金红石,而不是多晶布鲁克石、锐钛矿和超高压改性。在本章中,我们首先分别回顾了金红石的产状、微量元素地球化学和U-Pb年代学,以说明可以从微观结构、化学和年龄中获得的见解。然后,本着岩石年代学的精神,我们展示了结合这些方法的解释能力,并以意大利Ivrea区为例进行了研究。最后,提出了今后利用金红石进行岩石年代学研究的几个方面。金红石是中高压变质岩、高压变质基性岩和沉积岩中的特征矿物(如Force 1980;霜1991;Zack等人,2004b;tribold et al. 2012)。金红石也很少出现在岩浆岩中,例如斜长岩,以及一些热液系统中。粗粒度的……
Rutile (TiO2) is an important accessory mineral that, when present, offers a rich source of information about the rock units in which it is incorporated. It occurs in a variety of specific microstructural settings, contains significant amounts of several trace elements and is one of the classical minerals used for U–Pb age determination. Here, we focus on information obtainable from rutile in its original textural context. We do not present an exhaustive review on detrital rutile in clastic sediments, but note that an understanding of the petrochronology of rutile in its source rocks will aid interpretation of data obtained from detrital rutile. For further information on the important role of rutile in provenance studies, the reader is referred to previous reviews (e.g., Zack et al. 2004b; Meinhold 2010; Triebold et al. 2012). Coarse rutile is the only stable TiO2 polymorph under all crustal and upper mantle conditions, with the exception of certain hydrothermal environments (Smith et al. 2009). As such, we will focus on rutile rather than the polymorphs brookite, anatase and ultrahigh-pressure modifications.
In this chapter, we first review rutile occurrences, trace element geochemistry, and U–Pb geochronology individually to illustrate the insights that can be gained from microstructures, chemistry and ages. Then, in the spirit of petrochronology, we show the interpretational power of combining these approaches, using the Ivrea Zone (Italy) as a case study. Finally, we suggest some areas of future research that would improve petrochronologic research using rutile.
Rutile is a characteristic mineral in moderate- to high pressure metapelitic rocks, in high pressure metamorphosed mafic rocks, and in sedimentary rocks (e.g., Force 1980; Frost 1991; Zack et al. 2004b; Triebold et al. 2012). Rutile also occurs rarely in magmatic rocks, e.g., anorthosites, as well as in some hydrothermal systems. Coarse-grained …
期刊介绍:
RiMG is a series of multi-authored, soft-bound volumes containing concise reviews of the literature and advances in theoretical and/or applied mineralogy, crystallography, petrology, and geochemistry. The content of each volume consists of fully developed text which can be used for self-study, research, or as a text-book for graduate-level courses. RiMG volumes are typically produced in conjunction with a short course but can also be published without a short course. The series is jointly published by the Mineralogical Society of America (MSA) and the Geochemical Society.