Lau-Colville Ridge
The Lau-Colville Ridge is an extinct oceanic ridge located in the Pacific Ocean, on the oceanic Australian Plate in the southwest Pacific Ocean. It extends about 2,700 km (1,700 mi) from the southeast of Fiji to the continental shelf margin of New Zealand's North Island.[1]
| Lau-Colville Ridge | |
|---|---|
  Lau-Colville Ridge Location of Lau-Colville Ridge in the Pacific Ocean | |
| Highest point | |
| Coordinates | 27°06′S 179°12′W / 27.1°S 179.2°W |
| Dimensions | |
| Length | 2,700 km (1,700 mi) |
| Geography | |
| Country | New Zealand |
| Region | South Pacific Ocean |
| Geology | |
| Age of rock | 14–2.6 million years |
| Mountain type | Extinct oceanic ridge |
| Type of rock | Igneous |
Geography
changeThe Lau-Colville Ridge is divided into two segments:
- The northern Lau Ridge forms the western boundary of the Lau Basin and contributed to the formation of several islands southeast of Fiji.
- The southern Colville Ridge forms the western boundary of the Havre Trough.
To the west of the ridge lies the South Fiji Basin, whose bedrock is of Oligocene origin.[2][3]
Geology
changeThe ridge is composed primarily of mafic picro-basalts to dacite with underlying diverse rocks that are over 100 million years old. Volcanic activity along the Lau Ridge occurred mainly between 14 and 6 million years ago, while the Colville Ridge experienced volcanism between 7.5 and 2.6 million years ago.[4][5][6]
Tectonics
changeThe Lau-Colville Ridge was once a subduction boundary between the Australian Plate and the Pacific Plate. The ridge is now the inactive part of a 100 million-year-old arc/back-arc system. The adjacent Lau Basin contains active spreading centers that continue to evolve today.[7][8]
Related pages
changeReferences
change- ↑ "Marine Regions · Colville Ridge (Ridge)". marineregions.org. Retrieved 2024-09-20.
- ↑ "Marine Regions · Lau Ridge (Ridge)". marineregions.org. Retrieved 2024-09-20.
- ↑ https://ruor.uottawa.ca/bitstream/10393/43523/3/Gray_Alexandra_2022_thesis.pdf
- ↑ http://oceanrep.geomar.de/46263/6/Timm_REVISED.pdf
- ↑ http://igppweb.ucsd.edu/~dbassett/Publications_files/Timm_Louisville_seamount_subduction_NatureComm_2013.pdf[permanent dead link]
- ↑ Todd, E.; Gill, J. B.; Wysoczanski, R. J.; Hergt, Janet; Wright, I. C.; Leybourne, M. I.; Mortimer, N. (2011-09). "Hf isotopic evidence for small-scale heterogeneity in the mode of mantle wedge enrichment: Southern Havre Trough and South Fiji Basin back arcs: HAVRE TROUGH MANTLE WEDGE". Geochemistry, Geophysics, Geosystems. 12 (9): n/a–n/a. doi:10.1029/2011GC003683.
{{cite journal}}: Check date values in:|date=(help) - ↑ https://www.researchgate.net/publication/248257025
- ↑ https://hal.archives-ouvertes.fr/hal-00407049/file/2001GC000261.pdf
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