Abstract
| Original language | Finnish |
|---|---|
| Title of host publication | XXV GEOFYSIIKAN PÄIVÄT |
| Editors | Pertti Kaikkonen , Kari Kaila, Toivo Korja, Elena Kozlovskaya, Kari Moisio, Markku Pirttijärvi |
| Number of pages | 4 |
| Place of Publication | Oulu |
| Publisher | Uniprint |
| Publication date | 2011 |
| Pages | 117-120 |
| Publication status | Published - 2011 |
| MoE publication type | B3 Article in conference proceedings |
| Event | Geofysiikan Päivät - Oulu, Finland Duration: 11 May 2011 → 12 May 2011 Conference number: 25 |
Fields of Science
- 114 Physical sciences
Cite this
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Paleo- ja mesoproterotsooisten supermannerten kehitys paleomagneettisten tulosten perusteella. / Veikkolainen, T.; Pesonen, Lauri; Mertanen, S.
XXV GEOFYSIIKAN PÄIVÄT. ed. / Pertti Kaikkonen ; Kari Kaila; Toivo Korja; Elena Kozlovskaya; Kari Moisio; Markku Pirttijärvi. Oulu : Uniprint, 2011. p. 117-120.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific
TY - GEN
T1 - Paleo- ja mesoproterotsooisten supermannerten kehitys paleomagneettisten tulosten perusteella.
AU - Veikkolainen, T.
AU - Pesonen, Lauri
AU - Mertanen, S.
N1 - ISSN 0358-2981 Volume: Proceeding volume:
PY - 2011
Y1 - 2011
N2 - Various geological and geophysical evidence show that at least two supercontinents, Columbia and Rodinia, existed during the Paleoproterozoic and Mesoproterozoic eras. In this study, updated paleomagnetic and isotope age data has been used to define the amalgamation and break-up times of these supercontinents. Before putting the ancient continents to a supercontinent assembly, we have tested the validity of the geocentric axial dipole model (GAD) of the Paleo-Mesoproterozoic geomagnetic field. The tests yield support to the GAD-model, but do not rule out a ca. 10% non-dipole (octupole) field. In the whole of Proterozoic, Columbia and Rodinia were predominantly in moderate to low paleolatitudes. In the Paleoproterozoic, unexpected low-latitude glaciations took place in several continents. The pre-Columbia orogenies were caused by a complex set of collisions, rotations and transform or strike slip faultings that caused the orogenic belts to appear obliquely. However, no prominent difference was observed between paleomagnetically derived and recent geologic models of Columbia. The final amalgamation of Columbia didn’t happen until ca. 1.53 Ga. Columbia broke up at ca. 1.18 Ga during several rifting episodes, followed by a short period of independent drift of most continents. The amalgamation of Rodinia took place at 1.10 - 1.04 Ga.
AB - Various geological and geophysical evidence show that at least two supercontinents, Columbia and Rodinia, existed during the Paleoproterozoic and Mesoproterozoic eras. In this study, updated paleomagnetic and isotope age data has been used to define the amalgamation and break-up times of these supercontinents. Before putting the ancient continents to a supercontinent assembly, we have tested the validity of the geocentric axial dipole model (GAD) of the Paleo-Mesoproterozoic geomagnetic field. The tests yield support to the GAD-model, but do not rule out a ca. 10% non-dipole (octupole) field. In the whole of Proterozoic, Columbia and Rodinia were predominantly in moderate to low paleolatitudes. In the Paleoproterozoic, unexpected low-latitude glaciations took place in several continents. The pre-Columbia orogenies were caused by a complex set of collisions, rotations and transform or strike slip faultings that caused the orogenic belts to appear obliquely. However, no prominent difference was observed between paleomagnetically derived and recent geologic models of Columbia. The final amalgamation of Columbia didn’t happen until ca. 1.53 Ga. Columbia broke up at ca. 1.18 Ga during several rifting episodes, followed by a short period of independent drift of most continents. The amalgamation of Rodinia took place at 1.10 - 1.04 Ga.
KW - 114 Fysiikka
M3 - Konferenssiartikkeli
SP - 117
EP - 120
BT - XXV GEOFYSIIKAN PÄIVÄT
A2 - Kaikkonen , Pertti
A2 - Kaila, Kari
A2 - Korja, Toivo
A2 - Kozlovskaya, Elena
A2 - Moisio, Kari
A2 - Pirttijärvi, Markku
PB - Uniprint
CY - Oulu
ER -