Formation and Evolution of Microcontinents of the Kerguelen Plateau, Southern Indian Ocean

Leitchenkov, G. L.; Dubinin, E. P.; Grokholsky, A. L.; Agranov, G. D.

doi:10.1134/s0016852118050035

Cited by 10 publications

(1 citation statement)

References 24 publications

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“…As follows from the above, the Elan bank is a "foreign body" in relation to the Kerguelen Plateau. As for the plateau as a whole, from the point of view of plate tectonics, it appears to be a structural-mag-matic conglomerate consisting of two or three continental blocks (terranes), a fragment of a magmatic province, and a hot spot (Borissova et al, 2003;Leichenkov et al, 2018;etc.). (Veevers et al, 1975), (c) after (Markl, 1974), (d) after (Falvey, 1972), (e) after (Crawford, 1969;Sastri et al, 1981;Mohanty, 2012), and (f) after (Ridd, 1971).…”

Section: Some Critical Remarks On Plate Tectonic Modelingmentioning

confidence: 99%

Nature of the Kergelen Plateau and Its Place in the Structural Plan of the Southern Sector of the Indian Ocean

Illarionov

Boyko

Borisova

et al. 2021

Izv. Atmos. Ocean. Phys.

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The morphostructural characteristics of the main taxa of southern Indian Ocean, such as the Del Cano-Crozet, Conrad, and Kerguelen plateaus, are given based on structural-tectonic analysis. A depth map of the acoustic basement of the eastern part of the Afro-Antarctic megadepression is first built using the digitized NGDS database on the thickness of the sedimentary cover of the Indian Ocean, which is available on the Internet. A critical analysis of deep seismic sounding (DSS) data on the Kerguelen plateu hs been performed. A geochemical analysis of more than 100 samples of basalts, acidic rocks, and rocks of sedimentary origin, collected on the islands of the Kerguelen archipelago and raised by dredging and deep-sea drilling from the Kerguelen and Conrad plateaus, is carried out. The study has shown that the plateaus resemble the Madagascar Ridge in terms of morphostructure and a number of other features. It is concluded that these flat-topped horst massifs were the part of the "structural bridge" that connected Madagascar and the eastern part of mainland Antarctica no later than the Paleogene. A proposed alternative version of the geological interpretation of the deep seismic data states that the plateau has a relatively homogeneous structure along the strike, including a thick (at least 15-km) layer of continental crust. An analysis of the depth map of the acoustic basement made it possible to identify the depocenters of the relatively isolated Enderby, Shackleton and Labuan basins framing the Kerguelen Plateau on the southern side. The paragenetic connections of the Kerguelen Plateau with the basins indicate that the isolation of the Kerguelen Plateau from East Antarctica and the formation of the modern structure of the region began in the Late Cretaceous and ended with the last phase of tectonic activation in the Late Miocene-Pliocene. The results of geochemical analysis show that the geochemical and petrological anomalies of the plateau and islands are associated with the crust, and not with the mantle contamination, as well as with the continental nature of the Kerguelen Plateau.

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Section: Some Critical Remarks On Plate Tectonic Modelingmentioning

confidence: 99%

Nature of the Kergelen Plateau and Its Place in the Structural Plan of the Southern Sector of the Indian Ocean

Illarionov

Boyko

Borisova

et al. 2021

Izv. Atmos. Ocean. Phys.

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Opening of the North Atlantic Ocean and the rise of Scandinavian mountains

Makushkina,

Tauzin,

Miller

et al. 2024

Geology

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Large-scale topography is usually associated with tectonic plate boundaries, but the Scandinavian mountains (Scandes) are located far from any active tectonic setting, and their origin is unknown. We demonstrate that the Precambrian lithospheric structure of Fennoscandia controlled both the Cenozoic ocean opening and mountain rise in the North Atlantic region. Our new seismic receiver function analysis reveals a block of thick continental crust formed by Proterozoic crustal stacking. We propose that this block created a wide continental shelf bounded by two transform fault systems during continental breakup. This geometry resulted in the formation of lithospheric steps at the continental margin on both sides of the stacked crustal structure, coinciding with the highest Southern and Northern Scandes. We propose that edge-driven convection at these steps caused the mountain rise. This study presents a general model for the formation of high elevation behind passive margins.

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To the Question of Magmatism and Origin of the Afanasy Nikitin Rise Due to Discovery of Ancient Zircon by Three Billion Years Age

2022

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Formation and Evolution of Microcontinents of the Kerguelen Plateau, Southern Indian Ocean

Cited by 10 publications

References 24 publications

Nature of the Kergelen Plateau and Its Place in the Structural Plan of the Southern Sector of the Indian Ocean

Nature of the Kergelen Plateau and Its Place in the Structural Plan of the Southern Sector of the Indian Ocean

Opening of the North Atlantic Ocean and the rise of Scandinavian mountains

To the Question of Magmatism and Origin of the Afanasy Nikitin Rise Due to Discovery of Ancient Zircon by Three Billion Years Age

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