Growth of primordial continents by cycles of oceanic lithosphere subductions: Evidence from tilted seismic anisotropy supported by geochemical and petrological findings

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F20%3A00523731" target="_blank" >RIV/67985530:_____/20:00523731 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S2451912X19300558" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2451912X19300558</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.sesci.2019.12.003" target="_blank" >10.1016/j.sesci.2019.12.003</a>

Result language

angličtina

Original language name

Growth of primordial continents by cycles of oceanic lithosphere subductions: Evidence from tilted seismic anisotropy supported by geochemical and petrological findings

Original language description

Formation of the first continents belongs to fundamental questions regarding the evolution of the Earth. Though the growth of early crust is often debated, role of the mantle lithosphere that represents the biggest volume of continents is often overlooked, particularly in geologic interpretations of tectonic processes. This is mainly due to difficulties in its imaging and uncertainty in its rheology. Investigation of seismic anisotropy from propagation of teleseismic P and S waves in three dimensions (3D), i.e., with no limitation imposed on the symmetry axis orientation into the horizontal or vertical directions, provides a unique constraint on tectonic fabrics and character of past and present-day deformations of the continental lithosphere. In this paper, we collect independent findings from seismology, petrology and geochemistry to support our 3D anisotropic model of mantle lithosphere with tilted symmetry axes, derived from data of passive seismic experiments organised in tectonically different domains of Archean, Proterozoic and Phanerozoic provinces of Europe. Olivine preferred orientation, formed by mantle convection in the oceanic mantle lithosphere due to its spreading on both sides of the midocean ridges, is a prerequisite for the tilted anisotropies that we model in the continents. We have explained the systematically oriented dipping fabrics in the continental mantle lithosphere by successive subductions of ancient oceanic plates and their accretions enlarging primordial continent cores. Consequent continental break-ups and assemblages of wandering micro-plates preserve “frozen” anisotropic fabrics and create patchwork structures of the present-day continents. Supporting arguments for such model arise from petrological and geochemical studies indicating that continental mantle peridotites formed in oceanic environments and became “continental” after significant thickening or underthrusting.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10507 - Volcanology

Project

<a href="/en/project/EF16_013%2F0001800" target="_blank" >EF16_013/0001800: Distributed System of Permanent Observatory Measurements and Temporary Monitoring of Geophysical Fields</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Solid Earth Sciences

ISSN

2451-912X

e-ISSN

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Volume of the periodical

5

Issue of the periodical within the volume

1

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

19

Pages from-to

50-68

UT code for WoS article

000536950600005

EID of the result in the Scopus database

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