Shaka Ridge (South Atlantic)-a Remnant of Continental Crust?

被引：0

作者：

Sushchevskaya, N. M. ^{[1
]}

Leitchenkov, G. L. ^{[2
,3
]}

Belyatsky, B. V. ^{[4
]}

Agapitova, D. A. ^{[3
]}

机构：

[1] Russian Acad Sci, Vernadsky Inst Geochem & Analyt Chem GEOKhI, Moscow 119991, Russia

[2] Gramberg All Russia Sci Res Inst Geol & Mineral Re, St Petersburg 190121, Russia

[3] St Petersburg State Univ, St Petersburg 199034, Russia

[4] Al Russian Geol Res Inst AP Karpinsky, Karpinsky Inst, St Petersburg 199106, Russia

来源：

GEOCHEMISTRY INTERNATIONAL | 2024年 / 62卷 / 12期

关键词：

South Atlantic; mid-ocean ridge; transform faults; Shaka Ridge; mantle plume; hot spot; continental crust; geochemistry; geochronology; SOUTHWEST INDIAN RIDGE; BOUVET TRIPLE JUNCTION; AGE-DETERMINATIONS; FALKLAND ISLANDS; AGULHAS PLATEAU; RIFT ZONES; BREAK-UP; MANTLE; MAGMATISM; EVOLUTION;

D O I：

10.1134/S0016702924700757

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

AbstractAs a result of a study of igneous rocks of the basalt - andesite series, dredged on the Shaka Ridge in the South Atlantic, it was found that they differ from the basalts of mid-ocean ridges and ocean islands, and have an age of 183.8 +/- 2.2 Ma, comparable to the time of manifestation of the Karoo-Maud mantle plume in central Gondwana. Geochemical and Sr-Nd-Pb isotopic features of the studied igneous rocks show their similarity with the Jurassic mafic complexes of the Ferrar province in Antarctica and the Falkland Islands, formed during the intrusion of the Karoo-Maud plume and under the influence of paleo-Pacific subduction. However the supply of ice rafted debris into the study area due to ice transportation is considered unlikely. Based on the all data obtained, it was concluded that the Shaka Ridge is a continental block that was moved during the opening of the South Atlantic in the Early Cretaceous-Early Miocene from the continental margin of Africa along an extended transform fault into the present Bouvet triple junction area.

引用

页码：1332 / 1351

页数：20

共 73 条

[1]

ALLEN RB, 1981, GEOLOGY, V9, P463, DOI 10.1130/0091-7613(1981)9<463:PAIOCR>2.0.CO

[2]

[3] Lifetime of an ocean island volcano feeder zone: constraints from U-Pb dating on coexisting zircon and baddeleyite, and 40Ar/39Ar age determinations, Fuerteventura, Canary Islands [J].

Allibon, James ;

Ovtcharova, Maria ;

Bussy, Francois ;

Cosca, Michael ;

Schaltegger, Urs ;

Bussien, Denise ;

Lewin, Eric .

CANADIAN JOURNAL OF EARTH SCIENCES, 2011, 48 (02) :567-592

[4]

[Anonymous], 2016, UN CONV LAW SEA, P1

[5]

[Anonymous], 1971, J. Glaciol., DOI DOI 10.3189/S0022143000013058

[6]

Armienti P., 2011, INTERJ GEOSCI, V2, P231, DOI [10.4236/ijg.2011.23025, DOI 10.4236/IJG.2011.23025]

[7] Data on the arc magmatism developed in the Antarctic Peninsula and Patagonia during the Late Triassic-Jurassic: A compilation of new and previous geochronology, geochemistry and isotopic tracing results [J].

Bastias, Joaquin ;

Spikings, Richard ;

Riley, Teal ;

Ulianov, Alexey ;

Grunow, Anne ;

Chiaradia, Massimo ;

Herve, Francisco .

DATA IN BRIEF, 2021, 36

[8]

Belyatsky B. V., 2010, 19 S IS GEOCH GEOKHI, P29

[9] The impact of icebergs of sub-Antarctic origin on Southern Ocean ice-rafted debris distributions [J].

Bigg, Grant R. .

QUATERNARY SCIENCE REVIEWS, 2020, 232 (232)

[10] Lower Cretaceous deposits trapped near the equatorial Mid-Atlantic Ridge [J].

Bonatti, E ;

Ligi, M ;

Borsetti, AM ;

Gasperini, L ;

Negri, A ;

Sartori, R .

NATURE, 1996, 380 (6574) :518-520

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