Abstract
Detrital monazite geochronology has been used in provenance studies. However, there are complexities in the interpretation of age spectra due to their wide occurrence in both igneous and metamorphic rocks. We use the multinomial logistic regression (MLR) and cross-validation (CV) techniques to establish a geochemical discrimination of monazite source rocks. The elemental abundance-based geochemical discrimination was tested by selecting 16 elements from granitic and metamorphic rocks. The MLR technique revealed that light rare earth elements (REEs), Eu, and some heavy REEs are important discriminators that reflect elemental fractionation during magmatism and/or metamorphism. The best model yielded a discrimination rate of ~97%, and the CV method validated this approach. We applied the discrimination model to detrital monazites from African rivers. The detrital monazites were mostly classified as granitic and of garnet-bearing metamorphic origins; however, their proportion of metamorphic origin was smaller than the proportion that was obtained by using the elemental-ratio-based discrimination proposed by Itano et al. in Chemical Geology (2018). Considering the occurrence of metamorphic rocks in the hinterlands and the different age spectra between monazite and zircon in the same rivers, a ratio-based discrimination would be more reliable. Nevertheless, our study demonstrates the advantages of machine-learning-based approaches for the quantitative discrimination of monazite.
Highlights
Detrital minerals have been widely used to investigate sedimentary provenances at a regional scale [1,2], ancient orogenic cycles [3,4], and Hadean geological events [5,6]
There is an important difference in the occurrence of igneous monazite and zircon: Monazite is restricted to low-Ca silicic rocks, whereas zircon is abundant in various silicic rock types [15,16,17]
The results were firstrates sorted by thewere discrimination rate andelements bywere the used, Akaike’s information criteria (AIC) in
Summary
Detrital minerals have been widely used to investigate sedimentary provenances at a regional scale [1,2], ancient orogenic cycles [3,4], and Hadean geological events [5,6]. This approach has become more common since the development of laser ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS) techniques in the 1990s. Detrital monazite has been used to study orogenic events [8,9,10,11].
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