Trace element indiscrimination diagrams

Li, Chusi; Arndt, Nicholas; Tang, Qingyan; Ripley, Edward M.

doi:10.1016/j.lithos.2015.06.022

Cited by 174 publications

(72 citation statements)

References 24 publications

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“…This means that the magma generation processes that occur in different tectonic settings are essentially complex processes that involve various components and chemical reactions. In addition, our findings are consistent with those of in Li et al () in that the compositional ranges of magmas from different tectonic settings overlap and therefore cannot be discriminated using simple binary or ternary diagrams (Figure ).…”

Section: Discussionsupporting

confidence: 92%

Geochemical Discrimination and Characteristics of Magmatic Tectonic Settings: A Machine‐Learning‐Based Approach

Ueki

Hino

Kuwatani

2018

Geochem Geophys Geosyst

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Geochemically discriminating between magmatism in different tectonic settings remains a fundamental part of understanding the processes of magma generation within the Earth's mantle. Here we present an approach where machine learning (ML) methods are used for quantitative tectonic discrimination and feature selection using global geochemical data sets containing data for volcanic rocks generated in eight different tectonic settings. This study uses support vector machine, random forest, and sparse multinomial regression (SMR) approaches. All these ML methods with data for 24 elements and five isotopic ratios allowed the successful geochemical discrimination between igneous rocks formed in eight different tectonic settings with a discriminant ratio better than 83% for all settings barring oceanic plateaus and back‐arc basins. SMR is a particularly powerful and interpretable ML method because it quantitatively identifies geochemical signatures that characterize the tectonic settings of interest and the characteristics of each sample as a probability of the membership of the sample for each setting. We also present the most representative basalt composition for each tectonic setting. The new data provide reference points for future geochemical discussions. Our results indicate that at least 17 elements and isotopic ratios are required to characterize each tectonic setting, suggesting that geochemical tectonic discrimination cannot be achieved using only a small number of elemental compositions and/or isotopic ratios. The results show that volcanic rocks formed in different tectonic settings have unique geochemical signatures, indicating that both volcanic rock geochemistry and magma generation processes are closely connected to the tectonic setting.

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Section: Discussionsupporting

confidence: 92%

Geochemical Discrimination and Characteristics of Magmatic Tectonic Settings: A Machine‐Learning‐Based Approach

Ueki

Hino

Kuwatani

2018

Geochem Geophys Geosyst

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“…Furthermore, several studies have raised concerns about the efficacy of a number of widely-used tectonic discrimination diagrams developed during the 1970s and 1980s (e.g. Wang & Glover, 1992;Snow, 2006;Li et al, 2015). This is because such diagrams were constructed using limited datasets that under-represent the extent of geochemical variation in igneous rocks from different tectonic settings.…”

Section: Resultsmentioning

confidence: 99%

Geochemistry and origin of Carboniferous (Mississippian; Viséan) bentonites in the Namur-Dinant Basin, Belgium: evidence for a Variscan volcanic source

Pointon¹,

Chew²,

Delcambre³

et al. 2018

Geol. Belg.

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ABSTRACT. Several thin clay-rich horizons occur interbedded with Mississippian (Viséan) limestones in the Namur-Dinant Basin, southern Belgium. These have been interpreted as diagenetically altered volcanic ash layers (bentonites). Whole-rock geochemical analysis of several bentonites was undertaken to provide insight into their original magmatic composition. Ratios of several trace elements that are considered to be immobile during diagenetic alteration and indicators of petrogenetic processes suggest that most of the bentonites were originally trachyandesitic to trachytic ashes. Furthermore, the coarse grain size of euhedral zircon phenocrysts (up to 400 µm in length) suggests a proximal volcanic source. Zircon U-Pb isotopic ages and wholerock geochemical data from these bentonites were compared with literature data from volcanic and intrusive rocks in adjacent areas, and suggest that the bentonites were sourced from volcanoes within the Variscan orogenic belt.KEYWORDS: altered volcanic ash, cinerite, whole-rock geochemistry, trace element geochemistry, X-ray diffraction analysis.http://dx

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“…Although we follow 544 unambiguously deduced using other methods, for example in the case of ophiolites (Pearce, 561 2008(Pearce, 561 , 2014b). However, the ability to correctly discriminate samples from mid-ocean ridges, 562 island arcs and ocean islands using binary and ternary diagrams has been assessed as no 563 better than 60% (Snow, 2006), and the use of these diagrams at all in discrimination of 564 magma type has been challenged (Li et al, 2015). This calls into question whether such 565 diagrams should be used in assessing the tectonic setting of Archean greenstones (Pearce, 566 2008;Condie, 2015).…”

Section: Trace Elements 442 443mentioning

confidence: 99%

Subduction or sagduction? Ambiguity in constraining the origin of ultramafic–mafic bodies in the Archean crust of NW Scotland

Johnson

Brown

Goodenough

et al. 2016

Precambrian Research

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Trace element indiscrimination diagrams

Cited by 174 publications

References 24 publications

Geochemical Discrimination and Characteristics of Magmatic Tectonic Settings: A Machine‐Learning‐Based Approach

Geochemical Discrimination and Characteristics of Magmatic Tectonic Settings: A Machine‐Learning‐Based Approach

Geochemistry and origin of Carboniferous (Mississippian; Viséan) bentonites in the Namur-Dinant Basin, Belgium: evidence for a Variscan volcanic source

Subduction or sagduction? Ambiguity in constraining the origin of ultramafic–mafic bodies in the Archean crust of NW Scotland

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