Evidence for Low-Pressure Crustal Anatexis During the Northeast Atlantic Break-Up

doi:10.1029/2023GC011413

IOCAS-IR

	Evidence for Low-Pressure Crustal Anatexis During the Northeast Atlantic Break-Up
	Morris, A. M.1; Lambart, S.1; Stearns, M. A.2; Bowman, J. R.1; Jones, M. T.3; Mohn, G.4; Andrews, G.5; Millett, J.6,7; Tegner, C.8; Chatterjee, S.9; Frieling, J.10; Guo, P.11; Jolley, D. W.6; Cunningham, E. H.1; Berndt, C.12; Planke, S.7,13; Alvarez Zarikian, C. A.14; Betlem, P.13,15; Brinkhuis, H.16; Christopoulou, M.17; Ferre, E.18; Filina, I. Y.19; Harper, D. T.1; Longman, J.20; Scherer, R. P.17; Varela, N.21; Xu, W.22,23; Yager, S. L.24; Agarwal, A.25; Clementi, V. J.26
	2024-07-01
发表期刊	GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
卷号	25 期号:7 页码:31
通讯作者	Morris, A. M.([email protected])
摘要	While basaltic volcanism is dominant during rifting and continental breakup, felsic magmatism may be a significant component of some rift margins. During International Ocean Discovery Program (IODP) Expedition 396 on the continental margin of Norway, a graphite-garnet-cordierite bearing dacitic unit (the Mimir dacite) was recovered in two holes within early Eocene sediments on Mimir High (Site U1570), a marginal high on the V & oslash;ring Transform Margin. Here, we present a comprehensive textural, petrological, and geochemical study of the Mimir dacite in order to assess its origin and discuss the geodynamic implications. The major mineral phases (garnet, cordierite, quartz, plagioclase, alkali feldspar) are hosted in a fresh rhyolitic, vesicular, glassy matrix that is locally mingled with sediments. The major element chemistry of garnet and cordierite, the presence of zircon inclusions with inherited cores, and thermobarometric calculations all support an upper crustal metapelitic origin. While most magma-rich margin models favor crustal anatexis in the lower crust, thermobarometric calculations performed here show that the Mimir dacite was produced at upper-crustal depths (<5 kbar, 18 km depth) and high temperature (750-800 degrees C) with up to 3 wt% water content. In situ U-Pb analyses on zircon inclusions give a magmatic crystallization age of 54.6 +/- 1.1 Ma, consistent with emplacement that post-dates the Paleocene-Eocene Thermal Maximum. Our results suggest that the opening of the Northeast Atlantic was associated with a phase of low-pressure, high-temperature crustal anatexis preceding the main phase of magmatism.
关键词	crustal anatexis Mimir High IODP Site U1570 continental break-up NAIP
DOI	10.1029/2023GC011413
收录类别	SCI
语种	英语
资助项目	U.S. Science Support Program, IODP; ACS Petroleum Research Fund[61305-DNI8]; NSF[EAR-1946346]; UK IODP[NE/W007142/1]
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001262599800001
出版者	AMER GEOPHYSICAL UNION
WOS关键词	EOCENE THERMAL MAXIMUM ; VORING TRANSFORM MARGIN ; CERRO-DEL-HOYAZO ; TRACE-ELEMENT ; BETIC CORDILLERA ; PERITECTIC GARNET ; PYROCLASTIC FLOWS ; MAGMATIC LIQUIDS ; ALMANDINE GARNET ; GRANITIC MAGMAS
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/186345
专题	中国科学院海洋研究所
通讯作者	Morris, A. M.
作者单位	1.Univ Utah, Dept Geol & Geophys, Salt Lake City, UT 84112 USA 2.Utah Valley Univ, Dept Earth Sci, Orem, UT USA 3.Umea Univ, Dept Ecol & Environm Sci, Umea, Sweden 4.CY Cergy Paris Univ, Lab Geosci & Environm Cergy, Cergy, France 5.Univ Hull, Sch Environm Sci, Kingston Upon Hull, England 6.Univ Aberdeen, Kings Coll, Dept Geol & Geophys, Aberdeen, Scotland 7.Volcan Basin Energy Res AS, Oslo, Norway 8.Aarhus Univ, Dept Geosci, Aarhus, Denmark 9.Univ Tokyo, Earthquake Res Inst, Bunkyo, Tokyo, Japan 10.Univ Oxford, Dept Earth Sci, Oxford, England 11.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China 12.GEOMAR Helmholtz Ctr Ocean Res Kiel, Kiel, Germany 13.Univ Oslo, Dept Geosci, Oslo, Norway 14.Texas A&M Univ, Int Ocean Discovery Program, College Stn, TX USA 15.Univ Ctr Svalbard UNIS, Dept Arctic Geol, Svalbard, Norway 16.NIOZ Royal Netherlands Inst Sea Res, Den Burg, Texel, Netherlands 17.Northern Illinois Univ, Dept Earth Atmosphere & Environm, De Kalb, IL USA 18.New Mexico State Univ, Dept Geol Sci, Las Cruces, NM USA 19.Univ Nebraska, Dept Earth & Atmospher Sci, Lincoln, NE USA 20.Northumbria Univ, Dept Geog & Environm Sci, Newcastle Upon Tyne, England 21.Virginia Tech, Dept Geosci, Blacksburg, VA USA 22.Univ Coll Dublin, Sch Earth Sci, Dublin, Ireland 23.Univ Coll Dublin, SFI Res Ctr Appl Geosci, Dublin, Ireland 24.Ball State Univ, Dept Environm Geol & Nat Resources, Muncie, IN USA 25.Indian Inst Technol Kanpur, Dept Earth Sci, Appl Struct Geol, Kanpur, India 26.Rutgers State Univ, Dept Marine & Coastal Sci, New Brunswick, NJ USA
推荐引用方式 GB/T 7714	Morris, A. M.,Lambart, S.,Stearns, M. A.,et al. Evidence for Low-Pressure Crustal Anatexis During the Northeast Atlantic Break-Up[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2024,25(7):31.
APA	Morris, A. M..,Lambart, S..,Stearns, M. A..,Bowman, J. R..,Jones, M. T..,...&Clementi, V. J..(2024).Evidence for Low-Pressure Crustal Anatexis During the Northeast Atlantic Break-Up.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,25(7),31.
MLA	Morris, A. M.,et al."Evidence for Low-Pressure Crustal Anatexis During the Northeast Atlantic Break-Up".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 25.7(2024):31.