Origins of textural, compositional, and isotopic complexity in monazite and its petrochronological analysis

Callum J. Hetherington, Ethan L. Backus, Christopher R.M. McFarlane, Christopher M. Fisher, D. Graham Pearson

Research output: Chapter in Book/Report/Conference proceedingChapter

5 Scopus citations

Abstract

Monazite is one of the most versatile accessory minerals for deciphering geologic processes, particularly in rocks with complex geotectonic histories. Its value as a petrochronometer comes from a combination of mechanical and chemical stability, coupled with thermodynamic reactivity to changing intrinsic and extrinsic factors, including temperature, pressure, whole‐rock composition, and fluid activity, such that individual monazite grains may consist of multiple discrete compositional, textural, and isotopic sub‐domains. Using microbeam techniques, each subdomain may be described and analyzed independently to construct a holistic time‐resolved history for the evolution of individual monazite grains. Through acquisition of similar data from a representative number of grains, a geologic history for the mineral population, and by extension, the rocks(s) in which they were, or are, hosted may be constructed. Monazite has additional value because the development of textures is, in part, controlled by the composition of fluids present. Moreover, multiple isotope systems (U‐Th‐Pb, Sm‐Nd, and O) may be exploited to collect information for both geochronological and geochemical purposes. This contribution reviews the mechanisms by which textural complexity develops in monazite, describes some of the analytical methods used to exploit the complexity, and demonstrates the broad range of applications that benefit from the study of texturally complex monazite. In addition, we present new data sets that highlight the power of petrochronology and laser ablation split‐stream inductively coupled plasma mass spectrometry in harnessing the unique attributes of monazite.

Original languageEnglish
Title of host publicationGeophysical Monograph Series
PublisherBlackwell Publishing Ltd
Pages63-90
Number of pages28
DOIs
StatePublished - 2017

Publication series

NameGeophysical Monograph Series
Volume232
ISSN (Print)0065-8448
ISSN (Electronic)2328-8779

Fingerprint Dive into the research topics of 'Origins of textural, compositional, and isotopic complexity in monazite and its petrochronological analysis'. Together they form a unique fingerprint.

  • Cite this

    Hetherington, C. J., Backus, E. L., McFarlane, C. R. M., Fisher, C. M., & Pearson, D. G. (2017). Origins of textural, compositional, and isotopic complexity in monazite and its petrochronological analysis. In Geophysical Monograph Series (pp. 63-90). (Geophysical Monograph Series; Vol. 232). Blackwell Publishing Ltd. https://doi.org/10.1002/9781119227250.ch3