The Subduction Factory: Geochemical perspectives

Sun, Weidong; Teng, Fang‐Zhen; Niu, Yaoling; Tatsumi, Yoshiyuki; Yang, Xiaoyong; Ling, Ming‐Xing

doi:10.1016/j.gca.2014.06.029

Cited by 20 publications

(4 citation statements)

References 94 publications

(105 reference statements)

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“…The basaltic rocks in our dataset can be generally subdivided into arc and continental rock groups because rocks from those two different tectonic settings undergo different petrogenetic processes and present distinct geochemical characteristics. Arc magmas are derived from the mantle wedge, which are strongly affected by the fluids and/or melts derived from the subducted slab (Plank & Langmuir, ; Ryan & Chauvel, ; Schmidt & Poli, ; Sun et al, ; Sun, Ding, Hu, & Li, ). Therefore, arc basaltic rocks usually contain higher silica contents than the intraplate continental basaltic rocks.…”

Section: Methodsmentioning

confidence: 99%

Statistical analysis on secular records of igneous geochemistry: Implication for the early Archean plate tectonics

Sun

Deng

2019

Geological Journal

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In recent years, application of statistical analysis to a sufficiently large geochemical database has become more and more popular to reveal the onset and evolution of plate tectonics as a consequence of the development of computer science and storage technology. Here, we introduce a robust statistical method to process a filtered geochemical dataset including predominantly continental basaltic rocks through Earth's history. The results show that the average Sr concentrations gradually increased from 3.8 to 0 Ga, indicating a progressively growing depth of magma source as a result of secular cooling of the mantle. However, the average La/Yb and Sm/Yb ratios only started to increase at ca. 3.0 Ga. Considering the La-Yb and Sm-Yb fractionations are commonly attributed to the residual garnet crystallization, we interpreted that the geotherm of the magma source of continental basaltic rocks before 3.0 Ga might be higher than the stability limit of garnet. As such, there were little or no garnets in the residue during partial melting of the upwelling asthenospheric mantle or mantle plumes before 3.0 Ga, which also implied a higher continental geotherm during that time. Such a high geotherm could not support the formation of contemporaneous high-pressure or medium-pressure TTGs (tonalite-trondhjemitegranodiorite) by vertical tectonic models associated with upwelling mantle heating or delaminated lower crust melting in the early Archean. We therefore conclude that the plate tectonics had occurred by ca. 3.8 Ga in a hot subduction style and contributed to the formations of high-and medium-pressure TTGs subsequently.

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Section: Methodsmentioning

confidence: 99%

Statistical analysis on secular records of igneous geochemistry: Implication for the early Archean plate tectonics

Sun

Deng

2019

Geological Journal

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“…Dehydration of subducted slab will occur before melting due to their P-T profiles (Syracuse and Abers, 2006;Syracuse et al, 2010), and the resulting fluids will play a critical role in the fertilization and melting of the mantle wedge (Kogiso et al, 1997;Gorman et al, 2006;Zhang et al, 2007;Sun et al, 2014). The relative immobility of some incompatible elements (e.g., HFSE) in aqueous fluids has long been used to distinguish between the roles of melts and fluids as metasomatising agents (Labanieh SiO 2 (wt.%)…”

Section: Subduction-modified Mantle Sourcementioning

confidence: 99%

Geochronology, geochemistry and geodynamic implications of the Late Mesozoic volcanic rocks in the southern Great Xing’an Mountains, NE China

Yang

Niu

Cheng

et al. 2015

Journal of Asian Earth Sciences

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“…Subduction transports materials from the surface of the Earth into the mantle, fractionates elements during dehydration and metasomatism, and forms arc magmas and a variety of ore deposits. The deep magmagentic and metallogenic processes involved have been conceptualized as the Subduction Factory (Hacker et al 2003;Sun 2003;van Keken et al 2009van Keken et al , 2011Sun et al 2014). This special issue of International Geology Review on 'Subduction and ore deposits' includes 12 papers on topics including metamorphism and element fractionations (Guo et al 2015;Huang and Xiao 2015), magmatism (Ding et al 2015;Wang et al 2015;Wu et al 2015bWu et al , 2015d and geochemistry of mafic-ultramafic rocks Wu et al 2015c), and subduction-related ore deposits (Chai et al 2015;Li and Jiang 2015;Wu et al 2015a) (Figure 1).…”

Section: Preface Subduction and Ore Depositsmentioning

confidence: 99%