TY - JOUR

T1 - Geology and paleomagnetism of Jeannette Island (De Long Archipelago, Eastern Arctic)

AU - Chernova, A. I.

AU - Metelkin, D. V.

AU - Matushkin, N. Yu

AU - Vernikovsky, V. A.

AU - Travin, A. V.

PY - 2017/9/1

Y1 - 2017/9/1

N2 - New characteristics and generalized geostructural, isotope-geochronological, and paleomagnetic data are presented for the first time for the territory of Jeannette Island in the De Long Archipelago. Until recently, this small rock outcrop in the East Siberian Sea, discovered in the late 19th century, has been in effect a blank spot on the geological map. Field work made in 2013 and subsequent laboratory analysis of the obtained sample collection show that the island has a volcanogenic-sedimentary section including many thin (up to several meters) dolerite dikes. These dikes are the main target of the study. Newly obtained 40Ar/39Ar isotope-geochronological data indicate that the earliest dike intrusion stage corresponds to the Ediacaran (553.6 ± 10.3 Ma). Several subsequent tectonothermal events can be inferred until and through the Early Carboniferous, which affected the stability of the isotope system in the dolerites. In addition, paleomagnetic data confirm at least one more stage of dike emplacement, in the Early Ordovician, as the coordinates of the virtual geomagnetic poles for the dikes are nearly identical to those of the Ordovician paleomagnetic pole determined for carbonate rocks of Kotelny Island. The study describes the main petromagnetic characteristics and magnetic mineralogy of the studied dolerites, validating the primary thermoremanent nature of the identified characteristic component. The results agree with available information on the paleomagnetism, tectonics, and paleogeography of the New Siberian Islands.

AB - New characteristics and generalized geostructural, isotope-geochronological, and paleomagnetic data are presented for the first time for the territory of Jeannette Island in the De Long Archipelago. Until recently, this small rock outcrop in the East Siberian Sea, discovered in the late 19th century, has been in effect a blank spot on the geological map. Field work made in 2013 and subsequent laboratory analysis of the obtained sample collection show that the island has a volcanogenic-sedimentary section including many thin (up to several meters) dolerite dikes. These dikes are the main target of the study. Newly obtained 40Ar/39Ar isotope-geochronological data indicate that the earliest dike intrusion stage corresponds to the Ediacaran (553.6 ± 10.3 Ma). Several subsequent tectonothermal events can be inferred until and through the Early Carboniferous, which affected the stability of the isotope system in the dolerites. In addition, paleomagnetic data confirm at least one more stage of dike emplacement, in the Early Ordovician, as the coordinates of the virtual geomagnetic poles for the dikes are nearly identical to those of the Ordovician paleomagnetic pole determined for carbonate rocks of Kotelny Island. The study describes the main petromagnetic characteristics and magnetic mineralogy of the studied dolerites, validating the primary thermoremanent nature of the identified characteristic component. The results agree with available information on the paleomagnetism, tectonics, and paleogeography of the New Siberian Islands.

KW - Arctic

KW - De Long Archipelago

KW - isotope geochronology

KW - Jeannette Island

KW - New Siberian Islands

KW - paleomagnetism

KW - TECTONICS

KW - SEDIMENTS

KW - ROCKS

KW - MENDELEEV

KW - ANISOTROPY

KW - SIBERIAN ISLANDS

KW - REGION

KW - FOLD TEST

KW - PALEOTECTONIC RECONSTRUCTIONS

KW - AGE

UR - http://www.scopus.com/inward/record.url?scp=85031744552&partnerID=8YFLogxK

U2 - 10.1016/j.rgg.2017.08.001

DO - 10.1016/j.rgg.2017.08.001

M3 - Article

AN - SCOPUS:85031744552

VL - 58

SP - 1001

EP - 1017

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 9

ER -