The onset of flysch sedimentation in the Kaoko Belt (NW Namibia) - Implications for the pre-collisional evolution of the Kaoko-Dom Feliciano-Gariep orogen

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F17%3A00477428" target="_blank" >RIV/67985831:_____/17:00477428 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00025798:_____/17:00000083

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.precamres.2017.06.017" target="_blank" >http://dx.doi.org/10.1016/j.precamres.2017.06.017</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.precamres.2017.06.017" target="_blank" >10.1016/j.precamres.2017.06.017</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The onset of flysch sedimentation in the Kaoko Belt (NW Namibia) - Implications for the pre-collisional evolution of the Kaoko-Dom Feliciano-Gariep orogen

Popis výsledku v původním jazyce

Detrital zircon provenance study of the eastern part of the Kaoko Belt in Namibia has revealed two distinct sources for the Neoproterozoic sedimentation along the southwestern Congo Craton margin. The lower part shows detrital zircon ages consistent with erosion of Paleoproterozoic basement of the Congo Craton with an inferred Mesoproterozoic volcano-sedimentary cover. Within the middle part, which includes glaciogenic sediments correlated with the Sturtian (717-660 Ma) glaciation, the Mesoproterozoic zircon grains disappear and the signal is dominated by ages from the Congo Craton basement. The sedimentation in these parts is interpreted as related to the early Neoproterozoic rifting. The sedimentary rocks in the top part of the profile contain subordinate proportion of the Paleo proterozoic-Archaean zircon grains and the populations are dominated by age groups of ca. 1.0-1.2 Ga, ca. 800-750 Ma and ca. 650 Ma, consistent with erosion of the Punta del Este-Coastal. An associated glaciogenic horizon interpreted as reflecting the Marinoan (645-635 Ma) glaciation constrains the sedimentation in the upper part of the succession and suggests a short time span between the high-grade metamorphism/magmatism in the Punta del Este-Coastal Terrane and its exhumation. Sedimentary rocks with such detrital zircon pattern appear also in the Damara and Gariep belts. Their source in the western part of the orogen suggests that they represent an early orogenic flysch that originated during early collision in the W part of the orogen. The short time span between the magmatism in the Punta del Este-Coastal Terrane and the early orogenic flysch derived from it suggests that the Coastal Terrane was never separated from the Congo Craton by an oceanic domain. The estimated time span between the lithospheric stretching and sedimentation of the flysch suggests that the Adamastor Ocean separating the forelands of the Kaoko-Dom Feliciano-Gariep orogen must have been small.

Název v anglickém jazyce

The onset of flysch sedimentation in the Kaoko Belt (NW Namibia) - Implications for the pre-collisional evolution of the Kaoko-Dom Feliciano-Gariep orogen

Popis výsledku anglicky

Detrital zircon provenance study of the eastern part of the Kaoko Belt in Namibia has revealed two distinct sources for the Neoproterozoic sedimentation along the southwestern Congo Craton margin. The lower part shows detrital zircon ages consistent with erosion of Paleoproterozoic basement of the Congo Craton with an inferred Mesoproterozoic volcano-sedimentary cover. Within the middle part, which includes glaciogenic sediments correlated with the Sturtian (717-660 Ma) glaciation, the Mesoproterozoic zircon grains disappear and the signal is dominated by ages from the Congo Craton basement. The sedimentation in these parts is interpreted as related to the early Neoproterozoic rifting. The sedimentary rocks in the top part of the profile contain subordinate proportion of the Paleo proterozoic-Archaean zircon grains and the populations are dominated by age groups of ca. 1.0-1.2 Ga, ca. 800-750 Ma and ca. 650 Ma, consistent with erosion of the Punta del Este-Coastal. An associated glaciogenic horizon interpreted as reflecting the Marinoan (645-635 Ma) glaciation constrains the sedimentation in the upper part of the succession and suggests a short time span between the high-grade metamorphism/magmatism in the Punta del Este-Coastal Terrane and its exhumation. Sedimentary rocks with such detrital zircon pattern appear also in the Damara and Gariep belts. Their source in the western part of the orogen suggests that they represent an early orogenic flysch that originated during early collision in the W part of the orogen. The short time span between the magmatism in the Punta del Este-Coastal Terrane and the early orogenic flysch derived from it suggests that the Coastal Terrane was never separated from the Congo Craton by an oceanic domain. The estimated time span between the lithospheric stretching and sedimentation of the flysch suggests that the Adamastor Ocean separating the forelands of the Kaoko-Dom Feliciano-Gariep orogen must have been small.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GA15-05988S" target="_blank" >GA15-05988S: Záznam rozpadu Rodinie (~800-750 Ma) v orogenních pásmech jihozápadní Afriky a jihovýchodní Jižní Ameriky</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Precambrian Research

ISSN

0301-9268

e-ISSN

—

Svazek periodika

298

Číslo periodika v rámci svazku

September 2017

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

15

Strana od-do

220-234

Kód UT WoS článku

000407654800014

EID výsledku v databázi Scopus

2-s2.0-85021151193