Evidence for Low-Pressure Crustal Anatexis During the Northeast Atlantic Break-Up
文献类型：期刊论文
| 作者 | Morris, A. M.3; Lambart, S.3; Stearns, M. A.22; Bowman, J. R.3; Jones, M. T.2; Mohn, G.26; Andrews, G.25; Millett, J.23,24; Tegner, C.1; Chatterjee, S.11 |
| 刊名 | GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
 |
| 出版日期 | 2024-07-01 |
| 卷号 | 25期号:7页码:31 |
| 关键词 | crustal anatexis Mimir High IODP Site U1570 continental break-up NAIP |
| DOI | 10.1029/2023GC011413 |
| 通讯作者 | Morris, A. M.(ashley.m.morris@utah.edu) |
| 英文摘要 | 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. |
| 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 |
| 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 |
| 语种 | 英语 |
| WOS记录号 | WOS:001262599800001 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/186344]  |
| 专题 | 中国科学院海洋研究所 |
| 通讯作者 | Morris, A. M. |
| 作者单位 | 1.Aarhus Univ, Dept Geosci, Aarhus, Denmark 2.Umea Univ, Dept Ecol & Environm Sci, Umea, Sweden 3.Univ Utah, Dept Geol & Geophys, Salt Lake City, UT 84112 USA 4.Univ Oslo, Dept Geosci, Oslo, Norway 5.Texas A&M Univ, Int Ocean Discovery Program, College Stn, TX USA 6.Univ Ctr Svalbard UNIS, Dept Arctic Geol, Svalbard, Norway 7.NIOZ Royal Netherlands Inst Sea Res, Den Burg, Texel, Netherlands 8.Northern Illinois Univ, Dept Earth Atmosphere & Environm, De Kalb, IL USA 9.New Mexico State Univ, Dept Geol Sci, Las Cruces, NM USA 10.Univ Nebraska, Dept Earth & Atmospher Sci, Lincoln, NE 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. |
入库方式： OAI收割
来源：海洋研究所
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