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Paleomagnetism of Khatyrka and Maynitsky superterranes, Koryak highlands, far eastern Russia

Didenko, A and Harbert, W and Stavsky, A (1993) Paleomagnetism of Khatyrka and Maynitsky superterranes, Koryak highlands, far eastern Russia. Tectonophysics, 220 (1-4). 141 - 155. ISSN 0040-1951

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Abstract

We have completed a paleomagnetic reconnaissance study of sedimentary and volcanic extrusive rocks collected from two major tectonic zones in northeastern Russia. Paleomagnetic sites were sampled within the fault-bounded structural units of the Khatyrka and Maynitsky superterranes and an overlap sequence of the Khatyrka superterrane. These sampling localities were chosen to allow both within-site and between-site fold tests. Stepwise thermal demagnetization within the temperature range 200-640°C showed a characteristic linear demagnetization path between thermal demagnetization steps of 400°C and 530°C. For thermal steps above 550°C, the magnetic intensity of many samples began to increase rapidly with magnetic directions, which were random between heating steps, suggesting the formation of new magnetic phases in these samples. Paleomagnetic samples collected from basalts and sediments of the Khatyrka superterrane and basalts and gabbros of the Maynitsky superterrane pass fold tests and show significant poleward motion of these superterranes since the formation of their rocks. The observed paleomagnetic paleolatitudes between 24°N or S and 32°N or S can be compared with expected paleolatitudes of 57°N to 79°N. Paleomagnetic results from sites collected from overlapping Senonian rocks pass a fold test at the 99% confidence level and give a pole position not significantly different from that expected from the apparent polar wander path for the Eurasia or North America plates, suggesting that these sedimentary units overlapping the Khatyrka superterrane were deposited along the ancient northeast margin of the Eurasian plate. The declination, in stratigraphie coordinates, shows a maximum clockwise rotation of about 20° when compared with the Eurasian APWP. © 1993.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Didenko, A
Harbert, Wharbert@pitt.eduHARBERT
Stavsky, A
Date: 15 April 1993
Date Type: Publication
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Journal or Publication Title: Tectonophysics
Volume: 220
Number: 1-4
Page Range: 141 - 155
DOI or Unique Handle: 10.1016/0040-1951(93)90228-c
Institution: University of Pittsburgh
Refereed: Yes
ISSN: 0040-1951
Date Deposited: 26 Aug 2012 14:30
Last Modified: 02 Feb 2019 15:57
URI: http://d-scholarship.pitt.edu/id/eprint/13601

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