Tectonic subsidence of the Lomonosov Ridge

Details

Serval ID
serval:BIB_B2654C400006
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Tectonic subsidence of the Lomonosov Ridge
Journal
Geology
Author(s)
Minakov A.N., Podladchikov Y.Y.
ISSN-L
0091-7613
Publication state
Published
Issued date
2012
Peer-reviewed
Oui
Volume
40
Pages
99-102
Language
english
Abstract
The Cenozoic sedimentary record revealed by the Integrated Ocean
Drilling Program's Arctic Coring Expedition (ACEX) to the Lomonosov
Ridge microcontinent in 2004 is characterized by an unconformity
attributed to the period 44-18 Ma. According to conventional thermal
kinematic models, the microcontinent should have subsided to >1 km depth
owing to rifting and subsequent separation from the Barents-Kara Sea
margin at 56 Ma. We propose an alternative model incorporating a simple
pressure-temperature (P-T) relation for mantle density. Using this
model, we can explain the missing stratigraphic section by post-breakup
uplift and erosion. The pattern of linear magnetic anomalies and the
spreading geometry imply that the generation of oceanic crust in the
central Eurasia Basin could have been restricted and confined by
non-volcanic thinning of the mantle lithosphere at an early stage (ca.
56-40 Ma). In response to a rise in temperature, the mantle mineral
composition may have changed through breakdown of spinet peridotite and
formation of less dense plagioclase peridotite. The consequence of
lithosphere heating and related mineral phase transitions would be
post-breakup uplift followed by rapid subsidence to the deep-water
environment observed on the Lomonosov Ridge today.
Create date
09/10/2012 19:50
Last modification date
20/08/2019 15:21
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