A re-assessesment of the shallow paleomagnetic inclinations of the Western Cyclades, Greece
Consistently shallow paleomagnetic inclinations measured in Early to Middle Miocene lacustrine and dacitic volcanic rocks of the Kymi-Aliveri basin have been cited as evidence for an anomalous geomagnetic field geometry or northward drift of the Aegean Sea region. We present new paleomagnetic data f...
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National Documentation Centre
2018
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| Online Access: | http://hdl.handle.net/1721.1/118826 https://orcid.org/0000-0003-3113-3415 https://orcid.org/0000-0002-6485-0026 |
| _version_ | 1826211821569179648 |
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| author | Vassilakis, E. Bradley, Kyle Edward Royden, Leigh H Weiss, Benjamin P. |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Vassilakis, E. Bradley, Kyle Edward Royden, Leigh H Weiss, Benjamin P. |
| author_sort | Vassilakis, E. |
| collection | MIT |
| description | Consistently shallow paleomagnetic inclinations measured in Early to Middle Miocene lacustrine and dacitic volcanic rocks of the Kymi-Aliveri basin have been cited as evidence for an anomalous geomagnetic field geometry or northward drift of the Aegean Sea region. We present new paleomagnetic data from the lacustrine beds that are instead not anomalously shallow and consistent with deposition near their present-day latitude as predicted by global apparent polar wander paths. Anomalously shallow inclinations and easterly declinations reported from the Oxylithos volcanics are an artifact of an inappropriate tilt correction. The excessively shallow paleomagnetic inclinations reported from the deformed Middle Miocene plutons on Mykonos and Naxos are consistent with reorientation of an original thermoremanent magnetization acquired during cooling below 580°C by subsequent ductile strain at temperatures of 400-500°C. Magnetization overprints observed in these rocks may reflect the acquisition of a stable chemical remanent magnetization lying parallel to the transposed high-temperature magnetization as the result of low-temperature (<350°C) maghemitization. We therefore find no convincing evidence for an anomalous Middle Miocene field geometry, northward drift of the Aegean, or back-tilting of the low-angle normal faults that constitute the North Cycladic Detachment System. Keyword: Tectonics; paleomagnetism; detachment; paleolatitude; Kymi-Aliveri basin |
| first_indexed | 2024-09-23T15:11:55Z |
| format | Article |
| id | mit-1721.1/118826 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T15:11:55Z |
| publishDate | 2018 |
| publisher | National Documentation Centre |
| record_format | dspace |
| spelling | mit-1721.1/1188262024-05-15T06:41:46Z A re-assessesment of the shallow paleomagnetic inclinations of the Western Cyclades, Greece Vassilakis, E. Bradley, Kyle Edward Royden, Leigh H Weiss, Benjamin P. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Bradley, Kyle Edward Weiss, Benjamin P Royden, Leigh H Consistently shallow paleomagnetic inclinations measured in Early to Middle Miocene lacustrine and dacitic volcanic rocks of the Kymi-Aliveri basin have been cited as evidence for an anomalous geomagnetic field geometry or northward drift of the Aegean Sea region. We present new paleomagnetic data from the lacustrine beds that are instead not anomalously shallow and consistent with deposition near their present-day latitude as predicted by global apparent polar wander paths. Anomalously shallow inclinations and easterly declinations reported from the Oxylithos volcanics are an artifact of an inappropriate tilt correction. The excessively shallow paleomagnetic inclinations reported from the deformed Middle Miocene plutons on Mykonos and Naxos are consistent with reorientation of an original thermoremanent magnetization acquired during cooling below 580°C by subsequent ductile strain at temperatures of 400-500°C. Magnetization overprints observed in these rocks may reflect the acquisition of a stable chemical remanent magnetization lying parallel to the transposed high-temperature magnetization as the result of low-temperature (<350°C) maghemitization. We therefore find no convincing evidence for an anomalous Middle Miocene field geometry, northward drift of the Aegean, or back-tilting of the low-angle normal faults that constitute the North Cycladic Detachment System. Keyword: Tectonics; paleomagnetism; detachment; paleolatitude; Kymi-Aliveri basin National Science Foundation (U.S.) (Grant EAR-0409373) 2018-10-31T18:45:53Z 2018-10-31T18:45:53Z 2013 2018-10-01T16:01:25Z Article http://purl.org/eprint/type/JournalArticle 2529-1718 0438-9557 http://hdl.handle.net/1721.1/118826 Bradley, K.E. et al. “A Re-Assessesment of the Shallow Paleomagnetic Inclinations of the Western Cyclades, Greece.” Bulletin of the Geological Society of Greece 47, 2 (2013): 498 © 2013 The Authors https://orcid.org/0000-0003-3113-3415 https://orcid.org/0000-0002-6485-0026 http://dx.doi.org/10.12681/BGSG.11077 Bulletin of the Geological Society of Greece Creative Commons Attribution-NonCommercial 4.0 International http://creativecommons.org/licenses/by-nc/4.0/ application/pdf National Documentation Centre Bulletin of the Geological Society of Greece |
| spellingShingle | Vassilakis, E. Bradley, Kyle Edward Royden, Leigh H Weiss, Benjamin P. A re-assessesment of the shallow paleomagnetic inclinations of the Western Cyclades, Greece |
| title | A re-assessesment of the shallow paleomagnetic inclinations of the Western Cyclades, Greece |
| title_full | A re-assessesment of the shallow paleomagnetic inclinations of the Western Cyclades, Greece |
| title_fullStr | A re-assessesment of the shallow paleomagnetic inclinations of the Western Cyclades, Greece |
| title_full_unstemmed | A re-assessesment of the shallow paleomagnetic inclinations of the Western Cyclades, Greece |
| title_short | A re-assessesment of the shallow paleomagnetic inclinations of the Western Cyclades, Greece |
| title_sort | re assessesment of the shallow paleomagnetic inclinations of the western cyclades greece |
| url | http://hdl.handle.net/1721.1/118826 https://orcid.org/0000-0003-3113-3415 https://orcid.org/0000-0002-6485-0026 |
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