Palaeomagnetic study of a subaerial volcanic ridge (Sao Jorge Island, Azores) for the past 1.3 Myr: evidence for the CobbMountain Subchron, volcano flank instability and tectonomagmatic implications

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F12%3A00381740" target="_blank" >RIV/67985530:_____/12:00381740 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1111/j.1365-246X.2011.05320.x" target="_blank" >http://dx.doi.org/10.1111/j.1365-246X.2011.05320.x</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/j.1365-246X.2011.05320.x" target="_blank" >10.1111/j.1365-246X.2011.05320.x</a>

Result language

angličtina

Original language name

Palaeomagnetic study of a subaerial volcanic ridge (Sao Jorge Island, Azores) for the past 1.3 Myr: evidence for the CobbMountain Subchron, volcano flank instability and tectonomagmatic implications

Original language description

We present a palaeomagnetic study on 38 lava flows and 20 dykes encompassing the past 1.3 Myr on S. Jorge Island (Azores Archipelago?North Atlantic Ocean). The sections sampled in the southeastern and central/western parts of the island record reversed and normal polarities, respectively. They indicate a mean palaeomagnetic pole with a latitude shallower than that expected from Geocentric Axial Dipole assumption, suggesting an effect of non-dipolar components of the Earth magnetic field. Virtual Geomagnetic Poles of eight flows and two dykes closely follow the contemporaneous records of the Cobb Mountain Subchron (ODP/DSDP programs) and constrain the age transition from reversed to normal polarity. Volcano flank instabilities, probably related to dykeemplacement along an NNW?SSE direction, led to southwestward tilting of the lava pile towards the sea.

Czech name

—

Czech description

—

Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

DB - Geology and mineralogy

OECD FORD branch

—

Project

—

Continuities

Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year

2012

Confidentiality

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

Name of the periodical

Geophysical Journal International

ISSN

0956-540X

e-ISSN

—

Volume of the periodical

188

Issue of the periodical within the volume

3

Country of publishing house

GB - UNITED KINGDOM

Number of pages

20

Pages from-to

959-978

UT code for WoS article

000300567400014

EID of the result in the Scopus database

—