Cold subduction recorded by the 1.9 Ga Salma eclogite in Belomorian Province (Russia)

Li, Xiaoli; Zhang, Lifei; Wei, Chunjing; Bader, Thomas; Guo, Jinghui

doi:10.1016/j.epsl.2022.117930

Cited by 16 publications

(10 citation statements)

References 47 publications

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“…The occurrence of eclogite in ancient metamorphic terranes is a key indicator for the onset of modern‐style plate tectonics (Li et al., 2023; Moller et al., 1995; Ning et al., 2022). Although a range of indicators suggest that modern‐style plate tectonics could have occurred during the Paleoproterozoic to Archean era based on the isotopic and bulk‐rock chemical studies (Deng et al., 2019; Liu et al., 2019), few eclogites have been identified in Archean/Paleoproterozoic metamorphic terranes.…”

Section: Discussionmentioning

confidence: 99%

“…Eclogite melting by omphacite breakdown could be a viable mechanism Brown and Johnson (2018). Eclogites from this study and Wang et al (2021) are plotted for comparison; (d) Summary of P-T-t paths for eclogite from the central Himalaya; the paths for 2.0 Ga Tanzanian Usagarian eclogite (Moller et al, 1995), 1.9 Ga Belomorian eclogite (Li et al, 2023), and >2.47 Ga eclogite from North China Craton (Ning et al, 2022) are also shown for comparison.…”

Section: Discussionmentioning

confidence: 99%

“…Ning et al (2022) recently reported Archean eclogite-facies garnet clinopyroxenite (1.98-2.45 GPa, 792-890°C) within the North China Craton and insisted that modern-style subduction occurred in the Archean era, however, omphacite was not found in their study. Besides, UHT mafic granulites were widely exposed in Paleoproterozoic orogens with sparsely distributed eclogites (Huang et al, 2019;Li et al, 2023;Xu et al, 2018). One previous opinion suggested that the very shallow dehydration in the Archean formed a water-poor environment due to a high geothermal gradient, thus inhibiting the formation of eclogite-facies minerals.…”

Section: Did Eclogite Melting Destroy the Bulk Of Early Earth's High-...mentioning

confidence: 99%

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Omphacite Melting and the Destruction of Early High‐Pressure Rock Records

Liu,

Zhang,

Zhang

et al. 2023

JGR Solid Earth

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The presence of eclogite marks high‐pressure metamorphism and deep, cold burial of crust, and is therefore a widely accepted indicator for the onset of modern‐style plate tectonics. However, eclogite is rarely preserved in many heavily granulite‐overprinted orogens, which are particularly common across ancient metamorphic terranes (i.e., Archean and Paleoproterozoic terranes). Here, we show that eclogite melting processes may be principally responsible for the poor preservation of high‐pressure records. We demonstrate eclogite melting via detailed petrological, geochronological, and geochemical analyses on eclogites and separated centimetric leucosomes from the central Himalaya. The central Himalayan eclogites were overprinted by strong granulite‐facies metamorphism, such that omphacite is only sparsely preserved. Thermodynamic modeling results indicate the eclogite experienced two types of anatectic reactions: phengite dehydration melting at high‐pressure in the presence of omphacite, and subsequent omphacite dominated melting during exhumation. Diagnostic features for these melting reactions include (a) the occurrence of Kfs‐Pl‐Qz multiphase solid inclusions and Cpx‐Pl‐Qz polymineralic inclusions; (b) the high Na2O/K2O melts and Na‐rich plagioclase in leucosomes; (c) the consistent trace elements patterns between omphacite and leucosomes; and (d) obvious Na2O zonation in clinopyroxene. Omphacite dominated melting is characterized by the jadeite breakdown, releasing Na and Al into the melts. This melting mechanism subsequently forms a less sodic clinopyroxene and high Na2O/K2O melts. These Himalayan findings appear relevant to early Earth explorations because of the high thermal gradients and intense granulite‐facies overprints, implying that partial melting of eclogite dominated by omphacite breakdown could have erased early high‐pressure records of modern‐style plate tectonics.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Did Eclogite Melting Destroy the Bulk Of Early Earth's High-...mentioning

confidence: 99%

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Omphacite Melting and the Destruction of Early High‐Pressure Rock Records

Liu,

Zhang,

Zhang

et al. 2023

JGR Solid Earth

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“…Therefore, only a 'cold subduction' mechanism, similar to the current form of plate subduction, could send carbon-rich materials into the deep earth (Dasgupta and Hirschmann, 2010). Recent studies have shown that the current form of global plate subduction first appeared in the early Paleoproterozoic (Xu et al, 2018;Li et al, 2023). Thus, when and how carbon uptake from the atmosphere was first subducted into the deep mantle and how the carbon cycle coupled with the evolution of a habitable Earth, are under debate.…”

Section: Introductionmentioning

confidence: 99%

The Paleoproterozoic and Neoproterozoic Carbon Cycle Promoted the Evolution of a Habitable Earth

LIU

Zhang

2023

Acta Geologica Sinica (Eng)

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The carbon cycle is an important process that regulates Earth's evolution. We compare two typical periods, in the Paleoproterozoic and Neoproterozoic, in which many geological events occurred. It remains an open question when modern plate tectonics started on Earth and how it has influenced the carbon cycle through time. In the Paleoproterozoic, intense weathering in a highly CO 2 and CH 4 rich atmosphere caused more nutritional elements to be carried into the ocean. Terrestrial input boosted high biological productivity, deposition of sediments and the formation of an altered oceanic crust, which may have promoted an increase in the oxygen content. Sediment lubrication and a decrease in mantle potential temperature made cold and deep subduction possible, which carried more carbon into the deep mantle. Carbon can be stored in the mantle as diamond and carbonated mantle rocks, being released by arc and mid-ocean ridge outgassing at widely different times. From the Paleoproterozoic through the Neoproterozoic to the Phanerozoic, the carbon cycle has promoted the evolution of a habitable Earth.

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“…11,37 . However, could deep subduction with low thermobaric gradients has been found at few localities from different Palaeoproterozoic orogenic belts around the world, including the 2.2-2.0 Ga blueschist in West Africa 38 , 1.83 Ga eclogite from the Trans-Hudson orogen in Canada 39 , 2.09 Ga retrograded eclogite from the Eburnian-Transamazonian orogen in Congo 40 , 1.80 Ga eclogite from the Trans-North China Orogen in North China 41 , and 1.9 Ga Salma eclogite from Belomorian Province on the Fennoscandian Shield42 . Moreover, ancient Pacific-type paired metamorphic belt has not so far been reported during the Archean and Paleoproterozoic Era, though Archean bimodal metamorphism involved high dT/dP and intermediate dT/dP rather than low dT/dP and high dT/dP metamorphism was reported in North China43 .…”

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Modern-style plate tectonics preserved in the Paleoproterozoic paired metamorphic belts driven by cold deep subduction

Yin

Xia

Cawood

et al. 2023

Preprint

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When modern-style plate tectonics commenced on Earth remains one of fundamental questions in unravelling the evolution of our planet, due to the apparent lack of low-thermal gradients in old metamorphic rocks (< 350 °C/GPa)—a key indicator of modern plate subduction—during the Archaean and Palaeoproterozoic Era. Here we present 2.0 Gyr lawsonite eclogites and associated eclogite-facies garnet-kyanite-chloritoid schists with low-thermal gradients of 265-290°C/GPa from the Kongling Complex in South China through integrated thermodynamic modelling and zircon in situ U-Pb dating. More importantly, a temporally equivalent mafic granulites with high-thermal gradients of ~720 °C/GPa has been also recognized spatially adjacent to those low dT/dP eclogite-facies rocks, integrated as a classic paired metamorphic belt. The results show a new discovery of Paleoproterozoic classic paired metamorphic belts driven by cold deep subduction in South China, indicating that the modern-style plate tectonics was already operative on Earth by the Palaeoproterozoic.

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Cold subduction recorded by the 1.9 Ga Salma eclogite in Belomorian Province (Russia)

Cited by 16 publications

References 47 publications

Omphacite Melting and the Destruction of Early High‐Pressure Rock Records

Omphacite Melting and the Destruction of Early High‐Pressure Rock Records

The Paleoproterozoic and Neoproterozoic Carbon Cycle Promoted the Evolution of a Habitable Earth

Modern-style plate tectonics preserved in the Paleoproterozoic paired metamorphic belts driven by cold deep subduction

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