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Dynamic Accretion Beneath a Slow-Spreading Ridge Segment: IODP Hole 1473A and the Atlantis Bank Oceanic Core Complex
Dick, H. J. B.1; MacLeod, C. J.2; Blum, P.3; Abe, N.4; Blackman, D. K.5; Bowles, J. A.6; Cheadle, M. J.7; Cho, K.8; Ciazela, J.9; Deans, J. R.10; Edgcomb, V. P.1; Ferrando, C.11; France, L.12; Ghosh, B.13; Ildefonse, B.11; John, B.7; Kendrick, M. A.14; Koepke, J.15; Leong, J. A. M.16; Liu, C.17; Ma, Q.18; Morishita, T.19; Morris, A.20; Natland, J. H.21; Nozaka, T.22; Pluemper, O.23; Sanfilippo, A.24; Sylvan, J. B.25; Tivey, M. A.1; Tribuzio, R.24; Viegas, G.26
2019-12-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
ISSN2169-9313
Volume124Issue:12Pages:12631-12659
Abstract809 deep IODP Hole U1473A at Atlantis Bank, SWIR, is 2.2 km from 1,508-mHole 735B and 1.4 from 158-m Hole 1105A. With mapping, it provides the first 3-D view of the upper levels of a 660-km(2) lower crustal batholith. It is laterally and vertically zoned, representing a complex interplay of cyclic intrusion, and ongoing deformation, with kilometer-scale upward and lateral migration of interstial melt. Transform wall dives over the gabbro-peridotite contact found only evolved gabbro intruded directly into the mantle near the transform. There was no high-level melt lens, rather the gabbros crystallized at depth, and then emplaced into the zone of diking by diapiric rise of a crystal mush followed by crystal-plastic deformation and faulting. The residues to mass balance the crust to a parent melt composition lie at depth below the center of the massif-likely near the crust-mantle boundary. Thus, basalts erupted to the seafloor from >1,550 mbsf. By contrast, the Mid-Atlantic Ridge lower crust drilled at 23 degrees N and at Atlantis Massif experienced little high-temperature deformation and limited late-stage melt transport. They contain primitive cumulates and represent direct intrusion, storage, and crystallization of parental MORB in thinner crust below the dike-gabbro transition. The strong asymmetric spreading of the SWIR to the south was due to fault capture, with the northern rift valley wall faults cutoff by a detachment fault that extended across most of the zone of intrusion. This caused rapid migration of the plate boundary to the north, while the large majority of the lower crust to spread south unroofing Atlantis Bank and uplifting it into the rift mountains.
DOI10.1029/2018JB016858
Funding OrganizationNational Science Foundation (NSF) ; National Science Foundation (NSF) ; Investment in Science Fund at WHOI ; Investment in Science Fund at WHOI ; National Science Foundation (NSF) ; National Science Foundation (NSF) ; Investment in Science Fund at WHOI ; Investment in Science Fund at WHOI ; National Science Foundation (NSF) ; National Science Foundation (NSF) ; Investment in Science Fund at WHOI ; Investment in Science Fund at WHOI ; National Science Foundation (NSF) ; National Science Foundation (NSF) ; Investment in Science Fund at WHOI ; Investment in Science Fund at WHOI
WOS KeywordSOUTHWEST INDIAN RIDGE ; THIN CRUST ; ULTRASLOW ; CONVECTION ; MECHANISM ; EVOLUTION ; ROCKS
Language英语
Funding ProjectNational Science Foundation (NSF)[OCE1434452] ; National Science Foundation (NSF)[OCE1637130] ; Investment in Science Fund at WHOI
Funding OrganizationNational Science Foundation (NSF) ; National Science Foundation (NSF) ; Investment in Science Fund at WHOI ; Investment in Science Fund at WHOI ; National Science Foundation (NSF) ; National Science Foundation (NSF) ; Investment in Science Fund at WHOI ; Investment in Science Fund at WHOI ; National Science Foundation (NSF) ; National Science Foundation (NSF) ; Investment in Science Fund at WHOI ; Investment in Science Fund at WHOI ; National Science Foundation (NSF) ; National Science Foundation (NSF) ; Investment in Science Fund at WHOI ; Investment in Science Fund at WHOI
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000512314000017
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95650
Collection其他部门
Corresponding AuthorDick, H. J. B.
Affiliation1.Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA
2.Cardiff Univ, Dept Earth Sci, Cardiff, Wales
3.Texas A&M Univ, Int Ocean Discovery Program, College Stn, TX USA
4.Japan Agcy Marine Earth Sci & Technol, Ocean Drilling Sci, Yokosuka, Kanagawa, Japan
5.Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA
6.Univ Wisconsin, Dept Geosci, Milwaukee, WI 53201 USA
7.Univ Wyoming, Dept Geol & Geophys, Laramie, WY 82071 USA
8.Pukyong Natl Univ, Dept Environm Explorat Engn, Busan, South Korea
9.Polish Acad Sci, Space Res Ctr, Warsaw, Poland
10.Univ Southern Mississippi, Sch Biol Environm & Earth Sci, Hattiesburg, MS 39406 USA
11.Univ Montpellier, CNRS, Geosci Montpellier, Montpellier, France
12.Univ Lorraine, CNRS, Cte Rech Petrograph & Geochim, Nancy, France
13.Univ Calcutta, Dept Geol, Kolkata, India
14.Australian Natl Univ, Res Sch Earth Sci, Acton, ACT, Australia
15.Leibniz Univ Hannover, Inst Mineral, Hannover, Germany
16.Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ USA
17.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
18.Tongji Univ, Sch Ocean & Earth Sci, Shanghai, Peoples R China
19.Kanazawa Univ, Coll Sci & Engn, Kanazawa, Ishikawa, Japan
20.Univ Plymouth, Sch Geog Earth & Environm Sci, Plymouth, Devon, England
21.Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, 4600 Rickenbacker Causeway, Miami, FL 33149 USA
22.Okayama Univ, Dept Earth Sci, Okayama, Japan
23.Univ Utrecht, Dept Earth Sci, Utrecht, Netherlands
24.Univ Pavia, Dipartimento Sci Terra & Ambiente, Pavia, Italy
25.Texas A&M Univ, Dept Oceanog, College Stn, TX 77843 USA
26.Univ Brasilia, Inst Geociencias, Brasilia, DF, Brazil
Recommended Citation
GB/T 7714
Dick, H. J. B.,MacLeod, C. J.,Blum, P.,et al. Dynamic Accretion Beneath a Slow-Spreading Ridge Segment: IODP Hole 1473A and the Atlantis Bank Oceanic Core Complex[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2019,124(12):12631-12659.
APA Dick, H. J. B..,MacLeod, C. J..,Blum, P..,Abe, N..,Blackman, D. K..,...&Viegas, G..(2019).Dynamic Accretion Beneath a Slow-Spreading Ridge Segment: IODP Hole 1473A and the Atlantis Bank Oceanic Core Complex.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,124(12),12631-12659.
MLA Dick, H. J. B.,et al."Dynamic Accretion Beneath a Slow-Spreading Ridge Segment: IODP Hole 1473A and the Atlantis Bank Oceanic Core Complex".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 124.12(2019):12631-12659.
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