Deserpentinization and high-pressure (eclogite-facies) metamorphic features in the Eoarchean ultramafic body from Isua, Greenland

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Standard

Deserpentinization and high-pressure (eclogite-facies) metamorphic features in the Eoarchean ultramafic body from Isua, Greenland. / Guotana, Juan Miguel; Morishita, Tomoaki; Nishio, Ikuya; Tamura, Akihiro; Mizukami, Tomoyuki; Tani, Kenichiro; Harigane, Yumiko; Szilas, Kristoffer; Pearson, D. Graham.

I: Geoscience Frontiers, Bind 13, Nr. 1, 101298, 2021.

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt

Harvard

Guotana, JM, Morishita, T, Nishio, I, Tamura, A, Mizukami, T, Tani, K, Harigane, Y, Szilas, K & Pearson, DG 2021, 'Deserpentinization and high-pressure (eclogite-facies) metamorphic features in the Eoarchean ultramafic body from Isua, Greenland', Geoscience Frontiers, bind 13, nr. 1, 101298. https://doi.org/10.1016/j.gsf.2021.101298

APA

Guotana, J. M., Morishita, T., Nishio, I., Tamura, A., Mizukami, T., Tani, K., Harigane, Y., Szilas, K., & Pearson, D. G. (2021). Deserpentinization and high-pressure (eclogite-facies) metamorphic features in the Eoarchean ultramafic body from Isua, Greenland. Geoscience Frontiers, 13(1), [101298]. https://doi.org/10.1016/j.gsf.2021.101298

Vancouver

Guotana JM, Morishita T, Nishio I, Tamura A, Mizukami T, Tani K o.a. Deserpentinization and high-pressure (eclogite-facies) metamorphic features in the Eoarchean ultramafic body from Isua, Greenland. Geoscience Frontiers. 2021;13(1). 101298. https://doi.org/10.1016/j.gsf.2021.101298

Author

Guotana, Juan Miguel ; Morishita, Tomoaki ; Nishio, Ikuya ; Tamura, Akihiro ; Mizukami, Tomoyuki ; Tani, Kenichiro ; Harigane, Yumiko ; Szilas, Kristoffer ; Pearson, D. Graham. / Deserpentinization and high-pressure (eclogite-facies) metamorphic features in the Eoarchean ultramafic body from Isua, Greenland. I: Geoscience Frontiers. 2021 ; Bind 13, Nr. 1.

Bibtex

@article{eff80bf1122e4746b303d421aebfa770,
title = "Deserpentinization and high-pressure (eclogite-facies) metamorphic features in the Eoarchean ultramafic body from Isua, Greenland",
abstract = "Discontinuous chains of ultramafic rock bodies form part of the 3800–3700 Ma Isua Supracrustal Belt (ISB), hosted in the Itsaq Gneiss Complex of southwestern Greenland. These bodies are among the world{\textquoteright}s oldest outcrops of ultramafic rocks and hence an invaluable geologic record. Ultramafic rocks from Lens B in the northwestern limb of ISB show characteristics of several stages of serpentinization and deserpentinization forming prograde and retrograde mineral assemblages. Ti-rich humite-group minerals such as titanian chondrodite (Ti-Chn) and titanian clinohumite (Ti-Chu) often occur as accessory phases in the metamorphosed ultramafic rocks. The Ti-rich humite minerals are associated with metamorphic olivine. The host olivine is highly forsteritic (Fo96-98) with variable MnO and NiO contents. The concentrations of the rare-earth elements (REE) and high-field strength elements (HFSE) of the metamorphic olivine are higher than typical mantle olivine. The textural and chemical characteristics of the olivine indicate metamorphic origin as a result of deserpentinization of a serpentinized ultramafic protolith rather than primary assemblage reflecting mantle residues from high-degrees of partial melting. The close association of olivine, antigorite and intergrown Ti-Chn and Ti-Chu suggests pressure condition between ∼1.3–2.6 GPa within the antigorite stability field (",
keywords = "Titanian chondrodite, Titanian clinohumite, Isua supracrustal belt, UHP, Deserpentinization",
author = "Guotana, {Juan Miguel} and Tomoaki Morishita and Ikuya Nishio and Akihiro Tamura and Tomoyuki Mizukami and Kenichiro Tani and Yumiko Harigane and Kristoffer Szilas and Pearson, {D. Graham}",
year = "2021",
doi = "10.1016/j.gsf.2021.101298",
language = "English",
volume = "13",
journal = "Geoscience Frontiers",
issn = "1674-9871",
publisher = "China University of Geosciences (Beijing) and Peking University",
number = "1",

}

RIS

TY - JOUR

T1 - Deserpentinization and high-pressure (eclogite-facies) metamorphic features in the Eoarchean ultramafic body from Isua, Greenland

AU - Guotana, Juan Miguel

AU - Morishita, Tomoaki

AU - Nishio, Ikuya

AU - Tamura, Akihiro

AU - Mizukami, Tomoyuki

AU - Tani, Kenichiro

AU - Harigane, Yumiko

AU - Szilas, Kristoffer

AU - Pearson, D. Graham

PY - 2021

Y1 - 2021

N2 - Discontinuous chains of ultramafic rock bodies form part of the 3800–3700 Ma Isua Supracrustal Belt (ISB), hosted in the Itsaq Gneiss Complex of southwestern Greenland. These bodies are among the world’s oldest outcrops of ultramafic rocks and hence an invaluable geologic record. Ultramafic rocks from Lens B in the northwestern limb of ISB show characteristics of several stages of serpentinization and deserpentinization forming prograde and retrograde mineral assemblages. Ti-rich humite-group minerals such as titanian chondrodite (Ti-Chn) and titanian clinohumite (Ti-Chu) often occur as accessory phases in the metamorphosed ultramafic rocks. The Ti-rich humite minerals are associated with metamorphic olivine. The host olivine is highly forsteritic (Fo96-98) with variable MnO and NiO contents. The concentrations of the rare-earth elements (REE) and high-field strength elements (HFSE) of the metamorphic olivine are higher than typical mantle olivine. The textural and chemical characteristics of the olivine indicate metamorphic origin as a result of deserpentinization of a serpentinized ultramafic protolith rather than primary assemblage reflecting mantle residues from high-degrees of partial melting. The close association of olivine, antigorite and intergrown Ti-Chn and Ti-Chu suggests pressure condition between ∼1.3–2.6 GPa within the antigorite stability field (

AB - Discontinuous chains of ultramafic rock bodies form part of the 3800–3700 Ma Isua Supracrustal Belt (ISB), hosted in the Itsaq Gneiss Complex of southwestern Greenland. These bodies are among the world’s oldest outcrops of ultramafic rocks and hence an invaluable geologic record. Ultramafic rocks from Lens B in the northwestern limb of ISB show characteristics of several stages of serpentinization and deserpentinization forming prograde and retrograde mineral assemblages. Ti-rich humite-group minerals such as titanian chondrodite (Ti-Chn) and titanian clinohumite (Ti-Chu) often occur as accessory phases in the metamorphosed ultramafic rocks. The Ti-rich humite minerals are associated with metamorphic olivine. The host olivine is highly forsteritic (Fo96-98) with variable MnO and NiO contents. The concentrations of the rare-earth elements (REE) and high-field strength elements (HFSE) of the metamorphic olivine are higher than typical mantle olivine. The textural and chemical characteristics of the olivine indicate metamorphic origin as a result of deserpentinization of a serpentinized ultramafic protolith rather than primary assemblage reflecting mantle residues from high-degrees of partial melting. The close association of olivine, antigorite and intergrown Ti-Chn and Ti-Chu suggests pressure condition between ∼1.3–2.6 GPa within the antigorite stability field (

KW - Titanian chondrodite

KW - Titanian clinohumite

KW - Isua supracrustal belt

KW - UHP

KW - Deserpentinization

U2 - 10.1016/j.gsf.2021.101298

DO - 10.1016/j.gsf.2021.101298

M3 - Journal article

VL - 13

JO - Geoscience Frontiers

JF - Geoscience Frontiers

SN - 1674-9871

IS - 1

M1 - 101298

ER -

ID: 279833551