Paleointensity determination of Late Cretaceous basalts in northwest South Korea: implications for low and stable paleofield strength in the Late Cretaceous SCIE SCOPUS

Cited 4 time in WEB OF SCIENCE Cited 4 time in Scopus
Title
Paleointensity determination of Late Cretaceous basalts in northwest South Korea: implications for low and stable paleofield strength in the Late Cretaceous
Author(s)
Chang, Bongsu; Kim, Wonnyon; Doh, Seong-Jae; Yu, Yongjae
KIOST Author(s)
Kim, Wonnyon(김원년)
Publication Year
2013
Abstract
To clarify geomagnetic field behavior in the Late Cretaceous, paleointensity and rock-magnetic studies were carried out on basalts with K-Ar ages of 78.6 +/- 2.5 and 73.1 +/- 1.6 Ma in northwest South Korea. A total of 314 samples (262 from six lava flows and 52 from massive basalts) were subjected to Thellier-type IZZI paleointensity experiments. Through the application of seven paleointensity selection criteria that mainly verify the thermal alteration of magnetic minerals and the stability of remanence direction, fifteen paleointensity data were obtained from five of the lava flows. Based on rock-magnetic experiments and microscopic observations, it is revealed that the measured paleointensity is carried by single-domain (titano)magnetite. The site-mean paleointensities ranged 13.1-21.3 mu T, which corresponds to a virtual axial dipole moment of 2.3-3.8 x 10(22) Am-2. The combination of this result with selected data from the IAGA paleointensity database establishes the existence of different dipole moments according to rock type. In particular, the geomagnetic field strength recorded in Late Cretaceous crystalline volcanic rock was relatively low and stable, with a mean dipole moment of 4.0 +/- 1.9 x 10(22) Am-2 regardless of geomagnetic field reversals.
ISSN
1880-5981
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/3357
DOI
10.5047/eps.2013.09.013
Bibliographic Citation
EARTH PLANETS AND SPACE, v.65, no.12, pp.1501 - 1513, 2013
Publisher
SPRINGEROPEN
Subject
EARTHS MAGNETIC-FIELD; GEOMAGNETIC-FIELD; NORMAL SUPERCHRON; COOLING-RATE; ABSOLUTE PALEOINTENSITY; INNER-MONGOLIA; INTENSITY; ROCKS; MANTLE; GLASS
Keywords
Basalts; IZZI protocol; Korea; Late Cretaceous; paleointensity
Type
Article
Language
English
Document Type
Article
Publisher
SPRINGEROPEN
Related Researcher
Research Interests

Paleomagnetism,Environmental Science,Geology,고지자기,환경과학,지질학

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