Age and petrogenesis of Archaean chromitite from the Seqi Ultramafic Complex, southern West Greenland

Jiawei Wang; Pengjie Cai; Jingsui Yang; Kristoffer Szilas; Dongyang Lian; Zhaohua Luo; Fahui Xiong

doi:10.1016/j.lithos.2024.107714

Age and petrogenesis of Archaean chromitite from the Seqi Ultramafic Complex, southern West Greenland

Jiawei Wang, Pengjie Cai^*, Jingsui Yang, Kristoffer Szilas, Dongyang Lian, Zhaohua Luo, Fahui Xiong

^*Corresponding author for this work

Geology

Research output: Contribution to journal › Journal article › Research › peer-review

2 Citations (Scopus)

Abstract

The chromite deposits of the Seqi Ultramafic Complex are part of layered ultramafic bodies that occur within Mesoarchaean tonalitic orthogneiss in the 3.2–3.0 Ga Akia Terrane of the North Atlantic Craton, southern West Greenland. The calculated Al₂O₃-melt and TiO₂-melt concentrations of the parental melt are within the range of 12.22–12.60 and 0.34–0.41 wt%, respectively. Seqi chromitites exhibit the patterns of PGE normalised with chondrite with positive Os, Ir and Ru anomalies and negative PPGE anomalies. These geochemical characteristics indicate that the Seqi chromitites formed as part of cumulates originated from a parental komatiitic magma that experienced crustal contamination. The Re[sbnd]Os isotope data present a minimum Re-depletion model age (TRD) of 3124–3014 Ma for the Seqi chromitite, which is the best estimate of the magmatic age of this ultramafic intrusion. Abundant zircon grains occur within the Seqi chromitites, yielding a U[sbnd]Pb weighted mean age of 2985.43 ± 4.26 Ma, which is identical to the peak of regional granulite-facies metamorphism of the Akia Terrane. This study presents the first dating of the formation age of the Seqi chromitite of >3124 Ma.

Original language	English
Article number	107714
Journal	Lithos
Volume	482-483
Number of pages	15
ISSN	0024-4937
DOIs	https://doi.org/10.1016/j.lithos.2024.107714
Publication status	Published - 2024

Bibliographical note

Funding Information:
We would like to thank the editor and the anonymous reviewers for their constructive reviews of this paper's early version. Funding for this research was provided by the National Natural Science Foundation of China (92062215, 42302080, 42330306), the Fundamental Research Funds for the Central Universities (020614380175, 020614380186), the Outstanding Postdoctoral Program of Jiangsu Province (2022ZB12) and Special Funds Projects for Basic Scientific Research Business Expenses of Mineral Resources Research Institutes in Chinese Academy of Geological Sciences (KK2217). Funding for the fieldwork at the SUC was supported by the Villum Foundation via grant #18978.

Publisher Copyright:
© 2024 Elsevier B.V.

Keywords

Archaean chromitite
North Atlantic Craton
Re-Os
Southern West Greenland
Zircon

Access to Document

10.1016/j.lithos.2024.107714

Cite this

@article{f6d1f75ff28c4d1d910a9665f2b4c786,

title = "Age and petrogenesis of Archaean chromitite from the Seqi Ultramafic Complex, southern West Greenland",

abstract = "The chromite deposits of the Seqi Ultramafic Complex are part of layered ultramafic bodies that occur within Mesoarchaean tonalitic orthogneiss in the 3.2–3.0 Ga Akia Terrane of the North Atlantic Craton, southern West Greenland. The calculated Al2O3-melt and TiO2-melt concentrations of the parental melt are within the range of 12.22–12.60 and 0.34–0.41 wt%, respectively. Seqi chromitites exhibit the patterns of PGE normalised with chondrite with positive Os, Ir and Ru anomalies and negative PPGE anomalies. These geochemical characteristics indicate that the Seqi chromitites formed as part of cumulates originated from a parental komatiitic magma that experienced crustal contamination. The Re[sbnd]Os isotope data present a minimum Re-depletion model age (TRD) of 3124–3014 Ma for the Seqi chromitite, which is the best estimate of the magmatic age of this ultramafic intrusion. Abundant zircon grains occur within the Seqi chromitites, yielding a U[sbnd]Pb weighted mean age of 2985.43 ± 4.26 Ma, which is identical to the peak of regional granulite-facies metamorphism of the Akia Terrane. This study presents the first dating of the formation age of the Seqi chromitite of >3124 Ma.",

keywords = "Archaean chromitite, North Atlantic Craton, Re-Os, Southern West Greenland, Zircon",

author = "Jiawei Wang and Pengjie Cai and Jingsui Yang and Kristoffer Szilas and Dongyang Lian and Zhaohua Luo and Fahui Xiong",

note = "Funding Information: We would like to thank the editor and the anonymous reviewers for their constructive reviews of this paper's early version. Funding for this research was provided by the National Natural Science Foundation of China (92062215, 42302080, 42330306), the Fundamental Research Funds for the Central Universities (020614380175, 020614380186), the Outstanding Postdoctoral Program of Jiangsu Province (2022ZB12) and Special Funds Projects for Basic Scientific Research Business Expenses of Mineral Resources Research Institutes in Chinese Academy of Geological Sciences (KK2217). Funding for the fieldwork at the SUC was supported by the Villum Foundation via grant #18978. Publisher Copyright: {\textcopyright} 2024 Elsevier B.V.",

year = "2024",

doi = "10.1016/j.lithos.2024.107714",

language = "English",

volume = "482-483",

journal = "Lithos",

issn = "0024-4937",

publisher = "Elsevier",

}

TY - JOUR

T1 - Age and petrogenesis of Archaean chromitite from the Seqi Ultramafic Complex, southern West Greenland

AU - Wang, Jiawei

AU - Cai, Pengjie

AU - Yang, Jingsui

AU - Szilas, Kristoffer

AU - Lian, Dongyang

AU - Luo, Zhaohua

AU - Xiong, Fahui

N1 - Funding Information: We would like to thank the editor and the anonymous reviewers for their constructive reviews of this paper's early version. Funding for this research was provided by the National Natural Science Foundation of China (92062215, 42302080, 42330306), the Fundamental Research Funds for the Central Universities (020614380175, 020614380186), the Outstanding Postdoctoral Program of Jiangsu Province (2022ZB12) and Special Funds Projects for Basic Scientific Research Business Expenses of Mineral Resources Research Institutes in Chinese Academy of Geological Sciences (KK2217). Funding for the fieldwork at the SUC was supported by the Villum Foundation via grant #18978. Publisher Copyright: © 2024 Elsevier B.V.

PY - 2024

Y1 - 2024

N2 - The chromite deposits of the Seqi Ultramafic Complex are part of layered ultramafic bodies that occur within Mesoarchaean tonalitic orthogneiss in the 3.2–3.0 Ga Akia Terrane of the North Atlantic Craton, southern West Greenland. The calculated Al2O3-melt and TiO2-melt concentrations of the parental melt are within the range of 12.22–12.60 and 0.34–0.41 wt%, respectively. Seqi chromitites exhibit the patterns of PGE normalised with chondrite with positive Os, Ir and Ru anomalies and negative PPGE anomalies. These geochemical characteristics indicate that the Seqi chromitites formed as part of cumulates originated from a parental komatiitic magma that experienced crustal contamination. The Re[sbnd]Os isotope data present a minimum Re-depletion model age (TRD) of 3124–3014 Ma for the Seqi chromitite, which is the best estimate of the magmatic age of this ultramafic intrusion. Abundant zircon grains occur within the Seqi chromitites, yielding a U[sbnd]Pb weighted mean age of 2985.43 ± 4.26 Ma, which is identical to the peak of regional granulite-facies metamorphism of the Akia Terrane. This study presents the first dating of the formation age of the Seqi chromitite of >3124 Ma.

AB - The chromite deposits of the Seqi Ultramafic Complex are part of layered ultramafic bodies that occur within Mesoarchaean tonalitic orthogneiss in the 3.2–3.0 Ga Akia Terrane of the North Atlantic Craton, southern West Greenland. The calculated Al2O3-melt and TiO2-melt concentrations of the parental melt are within the range of 12.22–12.60 and 0.34–0.41 wt%, respectively. Seqi chromitites exhibit the patterns of PGE normalised with chondrite with positive Os, Ir and Ru anomalies and negative PPGE anomalies. These geochemical characteristics indicate that the Seqi chromitites formed as part of cumulates originated from a parental komatiitic magma that experienced crustal contamination. The Re[sbnd]Os isotope data present a minimum Re-depletion model age (TRD) of 3124–3014 Ma for the Seqi chromitite, which is the best estimate of the magmatic age of this ultramafic intrusion. Abundant zircon grains occur within the Seqi chromitites, yielding a U[sbnd]Pb weighted mean age of 2985.43 ± 4.26 Ma, which is identical to the peak of regional granulite-facies metamorphism of the Akia Terrane. This study presents the first dating of the formation age of the Seqi chromitite of >3124 Ma.

KW - Archaean chromitite

KW - North Atlantic Craton

KW - Re-Os

KW - Southern West Greenland

KW - Zircon

U2 - 10.1016/j.lithos.2024.107714

DO - 10.1016/j.lithos.2024.107714

M3 - Journal article

AN - SCOPUS:85198247368

SN - 0024-4937

VL - 482-483

JO - Lithos

JF - Lithos

M1 - 107714

ER -