|
Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
Peer-reviewed Journal Articles, etc >
Crustal structure of the ultra-slow spreading Knipovich Ridge, North Atlantic, along a presumed ridge segment center
| Title: | Crustal structure of the ultra-slow spreading Knipovich Ridge, North Atlantic, along a presumed ridge segment center |
| Authors: | Kandilarov, Aleksandre Browse this author | | Landa, Hildegunn Browse this author | | Mjelde, Rolf Browse this author | | Pedersen, Rolf B. Browse this author | | Okino, Kyoko Browse this author | | Murai, Yoshio Browse this author →KAKEN DB |
| Keywords: | Knipovich Ridge | | Ultra-slow spreading | | Crustal structure | | Refraction seismics | | Ocean bottom seismometer | | Multichannel seismic reflection |
| Issue Date: | Sep-2010 |
| Publisher: | Springer Netherlands |
| Journal Title: | Marine Geophysical Researches |
| Volume: | 31 |
| Issue: | 3 |
| Start Page: | 173 |
| End Page: | 195 |
| Publisher DOI: | 10.1007/s11001-010-9095-8 |
| Abstract: | A combined ocean bottom seismometer, multi-channel seismic reflection and gravity study has been carried out along the spreading direction of the Knipovich Ridge over a topographic high that defines a segment center. The youngest parts of the crust in the immediate vicinity of the ridge reveal fractured Oceanic Layer 2 and thermally expanded and possibly serpentinized Oceanic Layer 3. The mature part of the crust has normal thickness and seismic velocities with no significant crustal thickness and seismic velocity variations. Mature Oceanic Layer 2 is in addition broken into several rotated fault blocks. Comparison with a profile acquired ∼40 km north of the segment center reveals significant differences. Along this profile, reported earlier, periods of slower spreading led to generation of thin crust with a high P-wave velocity (Vp), composed of a mixture of gabbro and serpentinized mantle, while periods of faster spreading led to generation of more normal gabbroic crust. For the profile across the segment center no clear relation exists between spreading rate and crustal thickness and seismic velocity. In this study we have found that higher magmatism may lead to generation of oceanic crust with normal thickness even at ultra-slow spreading rates. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/44506 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
|
Submitter: 村井 芳夫
|
