TY - JOUR

T1 - A Paleoproterozoic magmatic flare-up in the Central Domain of the Ketilidian Orogen, South Greenland, and correlations to Canada and Scandinavia

AU - Vestergaard, R.

AU - Waight, T.

AU - Petersson, A.

AU - Hinchey, A. M.

AU - Whitehouse, M. J.

N1 - Funding Information: This study was supported by the Danish Independent Research Fund , DFF-Research Project 2 (grant number: 9040-0374B to TW). RV and TW thank the crew of the ship J.F. Johnstrup OZEP from 60 degree North Greenland Aps (André and Pituaq) for their assistance transporting us safely around South Greenland, and gratefully acknowledge the Greenlandic Government for allowing travel and field work during the corona pandemic. Thanks to Mojagan Alaei and Mia Benner from GEUS for zircon separation and mounting. Special thanks to Heejin Jeon from NordSIMS for scientific and technical assistance with the SIMS. The NordSIMS ion microprobe facility operates as Swedish-Icelandic infrastructure, partly funded by the Swedish Research Council (grant no. 2017-00671 ). This is NordSIMS contribution #745. RV and TW are grateful for the advice and discussions had with Adam A. Garde from GEUS, and for comments from Jochen Kolb, Anne Pietranik, Justin Payne and an anonymous reviewer. Funding Information: This study was supported by the Danish Independent Research Fund, DFF-Research Project 2 (grant number: 9040-0374B to TW). RV and TW thank the crew of the ship J.F. Johnstrup OZEP from 60 degree North Greenland Aps (André and Pituaq) for their assistance transporting us safely around South Greenland, and gratefully acknowledge the Greenlandic Government for allowing travel and field work during the corona pandemic. Thanks to Mojagan Alaei and Mia Benner from GEUS for zircon separation and mounting. Special thanks to Heejin Jeon from NordSIMS for scientific and technical assistance with the SIMS. The NordSIMS ion microprobe facility operates as Swedish-Icelandic infrastructure, partly funded by the Swedish Research Council (grant no. 2017-00671). This is NordSIMS contribution #745. RV and TW are grateful for the advice and discussions had with Adam A. Garde from GEUS, and for comments from Jochen Kolb, Anne Pietranik, Justin Payne and an anonymous reviewer. Publisher Copyright: © 2024 The Author(s)

PY - 2024/4

Y1 - 2024/4

N2 - The Central Domain of the Ketilidian Orogen in South Greenland preserves two magmatic events that provide insight into crustal architecture and represent a major contribution to continental crustal growth in connection with the assembly of the late Paleoproterozoic-Mesoproterozoic supercontinent Columbia/Nuna. This study provides zircon U-Pb geochronology for the western parts of the Central Domain and, combined with previous published age data, documents crustal evolution in the orogeny. The geochronological data indicate an initial volumetrically-minor magmatic event at ca. 1850 Ma, referred to here as the Older Julianehåb Igneous Suite, followed by a pause in magmatic activity. This is followed by the Younger Julianehåb Igneous Suite, a major pulse of magmatism (comparable to magmatic flare-ups in Phanerozoic arcs) between ca. 1814 and 1795 Ma. The adjacent arcs in the Makkovik Province, Canada, and the Transscandinavian Igneous Belt, Scandinavia, preserve similarly-aged magmatic events and appear to young from west to east. Exposure levels in the Makkovik Province are shallower than in the Ketilidian Orogen, and shallower supracrustal deposits are significantly more abundant in the Makkovik Province, indicating significant differences in modern erosion levels.

AB - The Central Domain of the Ketilidian Orogen in South Greenland preserves two magmatic events that provide insight into crustal architecture and represent a major contribution to continental crustal growth in connection with the assembly of the late Paleoproterozoic-Mesoproterozoic supercontinent Columbia/Nuna. This study provides zircon U-Pb geochronology for the western parts of the Central Domain and, combined with previous published age data, documents crustal evolution in the orogeny. The geochronological data indicate an initial volumetrically-minor magmatic event at ca. 1850 Ma, referred to here as the Older Julianehåb Igneous Suite, followed by a pause in magmatic activity. This is followed by the Younger Julianehåb Igneous Suite, a major pulse of magmatism (comparable to magmatic flare-ups in Phanerozoic arcs) between ca. 1814 and 1795 Ma. The adjacent arcs in the Makkovik Province, Canada, and the Transscandinavian Igneous Belt, Scandinavia, preserve similarly-aged magmatic events and appear to young from west to east. Exposure levels in the Makkovik Province are shallower than in the Ketilidian Orogen, and shallower supracrustal deposits are significantly more abundant in the Makkovik Province, indicating significant differences in modern erosion levels.

KW - Crustal growth

KW - Geochronology

KW - Granitoid

KW - Orogeny

KW - South Greenland

KW - Zircon

UR - http://www.scopus.com/inward/record.url?scp=85185522782&partnerID=8YFLogxK

U2 - 10.1016/j.precamres.2024.107320

DO - 10.1016/j.precamres.2024.107320

M3 - Journal article

AN - SCOPUS:85185522782

VL - 403

JO - Precambrian Research

JF - Precambrian Research

SN - 0301-9268

M1 - 107320

ER -