Age of Tertiary volcanic rocks on the West Greenland continental margin: volcanic evolution and event correlation to other parts of the North Atlantic Igneous Province

Lotte M. Larsen; Asger Ken Pedersen; Christian Tegner; Robert A. Duncan; Niels Hald; Jørgen Larsen

doi:10.1017/s0016756815000515

Age of Tertiary volcanic rocks on the West Greenland continental margin: volcanic evolution and event correlation to other parts of the North Atlantic Igneous Province

Lotte M. Larsen, Asger Ken Pedersen, Christian Tegner, Robert A. Duncan, Niels Hald, Jørgen Larsen

36 Citationer (Scopus)

Abstract

Radiometric ages for undated parts of the volcanic succession and intrusions in West Greenland were obtained by the ⁴⁰Ar–³⁹Ar incremental heating method. Acceptable crystallization ages were obtained for 27 samples. Combined with published results the new data provide a volcanic stratigraphy correlatable throughout the Nuussuaq Basin. The thick onshore volcanic pile consists of four widespread formations: 62.5–61 Ma picrites (Vaigat Formation), 61–60 Ma depleted basalts (Maligât Formation and the Hellefisk-1 well), 60–58 Ma less-depleted basalts (Svartenhuk Formation) and 56–54 Ma enriched basalts (Naqerloq Formation). Two local successions comprise 53.5 Ma alkali basalts (Erqua Formation) and 38.7 Ma transitional basalts (Talerua Member). A central volcano developed on Ubekendt Ejland, leading to the Sarqâta qáqâ gabbro-granophyre intrusion at 57–55 Ma. Pre-break-up volcanism took place further south as early as 64–63 Ma. The offshore volcanic succession most probably comprises the known onshore succession plus some younger lavas. The change in spreading direction near the Paleocene–Eocene boundary took place west of the Nuussuaq Basin c. 56.2 Ma. Some tectonomagmatic events are correlatable across the entire North Atlantic Igneous Province. A quiescent 58–56 Ma period correlates with similar periods in East Greenland and the Faroes, and the Naqerloq Formation is coeval with the Eocene basalts in East Greenland. The Paleocene and Eocene tholeiitic basalts are distinguishable chemically; in early Eocene time, mantle typical of the Iceland plume seems to have extended beneath the whole West Greenland margin as well as the central East Greenland margin.

Originalsprog	Engelsk
Tidsskrift	Geological Magazine
Vol/bind	153
Udgave nummer	3
Sider (fra-til)	487-511
Antal sider	25
ISSN	0016-7568
DOI	https://doi.org/10.1017/s0016756815000515
Status	Udgivet - 1 maj 2016

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10.1017/s0016756815000515

div-class-title-age-of-tertiary-volcanic-rocks-on-the-west-greenland-continental-margin-volcanic-evolution-and-event-correlation-to-other-parts-of-the-north-atlantic-igneous-province-div.pdfForlagets udgivne version, 1,81 MB

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Age of Tertiary volcanic rocks on the West Greenland continental margin : volcanic evolution and event correlation to other parts of the North Atlantic Igneous Province. / Larsen, Lotte M.; Pedersen, Asger Ken; Tegner, Christian et al.

I: Geological Magazine, Bind 153, Nr. 3, 01.05.2016, s. 487-511.

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review

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title = "Age of Tertiary volcanic rocks on the West Greenland continental margin: volcanic evolution and event correlation to other parts of the North Atlantic Igneous Province",

abstract = "Radiometric ages for undated parts of the volcanic succession and intrusions in West Greenland were obtained by the 40Ar–39Ar incremental heating method. Acceptable crystallization ages were obtained for 27 samples. Combined with published results the new data provide a volcanic stratigraphy correlatable throughout the Nuussuaq Basin. The thick onshore volcanic pile consists of four widespread formations: 62.5–61 Ma picrites (Vaigat Formation), 61–60 Ma depleted basalts (Malig{\^a}t Formation and the Hellefisk-1 well), 60–58 Ma less-depleted basalts (Svartenhuk Formation) and 56–54 Ma enriched basalts (Naqerloq Formation). Two local successions comprise 53.5 Ma alkali basalts (Erqua Formation) and 38.7 Ma transitional basalts (Talerua Member). A central volcano developed on Ubekendt Ejland, leading to the Sarq{\^a}ta q{\'a}q{\^a} gabbro-granophyre intrusion at 57–55 Ma. Pre-break-up volcanism took place further south as early as 64–63 Ma. The offshore volcanic succession most probably comprises the known onshore succession plus some younger lavas. The change in spreading direction near the Paleocene–Eocene boundary took place west of the Nuussuaq Basin c. 56.2 Ma. Some tectonomagmatic events are correlatable across the entire North Atlantic Igneous Province. A quiescent 58–56 Ma period correlates with similar periods in East Greenland and the Faroes, and the Naqerloq Formation is coeval with the Eocene basalts in East Greenland. The Paleocene and Eocene tholeiitic basalts are distinguishable chemically; in early Eocene time, mantle typical of the Iceland plume seems to have extended beneath the whole West Greenland margin as well as the central East Greenland margin.",

keywords = "flood basalts, intrusions, North Atlantic Igneous Province, radiometric dating, Tertiary, volcanic stratigraphy, West Greenland Basalt Group",

author = "Larsen, {Lotte M.} and Pedersen, {Asger Ken} and Christian Tegner and Duncan, {Robert A.} and Niels Hald and J{\o}rgen Larsen",

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doi = "10.1017/s0016756815000515",

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pages = "487--511",

journal = "Geological Magazine",

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T1 - Age of Tertiary volcanic rocks on the West Greenland continental margin

T2 - volcanic evolution and event correlation to other parts of the North Atlantic Igneous Province

AU - Larsen, Lotte M.

AU - Pedersen, Asger Ken

AU - Tegner, Christian

AU - Duncan, Robert A.

AU - Hald, Niels

AU - Larsen, Jørgen

PY - 2016/5/1

Y1 - 2016/5/1

N2 - Radiometric ages for undated parts of the volcanic succession and intrusions in West Greenland were obtained by the 40Ar–39Ar incremental heating method. Acceptable crystallization ages were obtained for 27 samples. Combined with published results the new data provide a volcanic stratigraphy correlatable throughout the Nuussuaq Basin. The thick onshore volcanic pile consists of four widespread formations: 62.5–61 Ma picrites (Vaigat Formation), 61–60 Ma depleted basalts (Maligât Formation and the Hellefisk-1 well), 60–58 Ma less-depleted basalts (Svartenhuk Formation) and 56–54 Ma enriched basalts (Naqerloq Formation). Two local successions comprise 53.5 Ma alkali basalts (Erqua Formation) and 38.7 Ma transitional basalts (Talerua Member). A central volcano developed on Ubekendt Ejland, leading to the Sarqâta qáqâ gabbro-granophyre intrusion at 57–55 Ma. Pre-break-up volcanism took place further south as early as 64–63 Ma. The offshore volcanic succession most probably comprises the known onshore succession plus some younger lavas. The change in spreading direction near the Paleocene–Eocene boundary took place west of the Nuussuaq Basin c. 56.2 Ma. Some tectonomagmatic events are correlatable across the entire North Atlantic Igneous Province. A quiescent 58–56 Ma period correlates with similar periods in East Greenland and the Faroes, and the Naqerloq Formation is coeval with the Eocene basalts in East Greenland. The Paleocene and Eocene tholeiitic basalts are distinguishable chemically; in early Eocene time, mantle typical of the Iceland plume seems to have extended beneath the whole West Greenland margin as well as the central East Greenland margin.

AB - Radiometric ages for undated parts of the volcanic succession and intrusions in West Greenland were obtained by the 40Ar–39Ar incremental heating method. Acceptable crystallization ages were obtained for 27 samples. Combined with published results the new data provide a volcanic stratigraphy correlatable throughout the Nuussuaq Basin. The thick onshore volcanic pile consists of four widespread formations: 62.5–61 Ma picrites (Vaigat Formation), 61–60 Ma depleted basalts (Maligât Formation and the Hellefisk-1 well), 60–58 Ma less-depleted basalts (Svartenhuk Formation) and 56–54 Ma enriched basalts (Naqerloq Formation). Two local successions comprise 53.5 Ma alkali basalts (Erqua Formation) and 38.7 Ma transitional basalts (Talerua Member). A central volcano developed on Ubekendt Ejland, leading to the Sarqâta qáqâ gabbro-granophyre intrusion at 57–55 Ma. Pre-break-up volcanism took place further south as early as 64–63 Ma. The offshore volcanic succession most probably comprises the known onshore succession plus some younger lavas. The change in spreading direction near the Paleocene–Eocene boundary took place west of the Nuussuaq Basin c. 56.2 Ma. Some tectonomagmatic events are correlatable across the entire North Atlantic Igneous Province. A quiescent 58–56 Ma period correlates with similar periods in East Greenland and the Faroes, and the Naqerloq Formation is coeval with the Eocene basalts in East Greenland. The Paleocene and Eocene tholeiitic basalts are distinguishable chemically; in early Eocene time, mantle typical of the Iceland plume seems to have extended beneath the whole West Greenland margin as well as the central East Greenland margin.

KW - flood basalts

KW - intrusions

KW - North Atlantic Igneous Province

KW - radiometric dating

KW - Tertiary

KW - volcanic stratigraphy

KW - West Greenland Basalt Group

U2 - 10.1017/s0016756815000515

DO - 10.1017/s0016756815000515

M3 - Journal article

AN - SCOPUS:84939122865

SN - 0016-7568

VL - 153

SP - 487

EP - 511

JO - Geological Magazine

JF - Geological Magazine

IS - 3

ER -

Age of Tertiary volcanic rocks on the West Greenland continental margin: volcanic evolution and event correlation to other parts of the North Atlantic Igneous Province

Abstract

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