Manus plate

{{short description|Tiny tectonic plate northeast of New Guinea}}

{{Infobox tectonic plate

| image = File:ManusPlate.png

| image_alt = The Manus plate

| type = Minor

| move_direction = north-west

| move_speed = 92mm/year

| geo_features = Pacific Ocean

}}

The Manus plate is a 100-km-wide tectonic microplate located northeast of New Guinea. The Manus plate was formed in between the North Bismark Plate and the South Bismark Plate. The Manus plate currently rotates counter-clockwise in the Melanesia area.{{Cite journal|last=Bird|first=Peter|date=2003|title=An updated digital model of plate boundaries|journal=Geochemistry, Geophysics, Geosystems|language=en|volume=4|issue=3|doi=10.1029/2001GC000252|bibcode=2003GGG.....4.1027B |issn=1525-2027|doi-access=free}}

Formation

The Manus plate formed during the Brunhes-Matuyama reversal, making its maximum age approximately 781,000 years old.{{Cite web|title=Caroline, North Bismarck, South Bismarck, Manus|url=http://swpacificplates.weebly.com/caroline-north-bismarck-south-bismarck-manus.html|website=Southwest Pacific plates|access-date=2020-03-12}} The Manus plate formed in-between and on top of the transform boundaries that were separating the North and South Bismark plates. The plate was formed of young mid-ocean ridge basalt, along with pieces of older oceanic floor that had broken off of the South Bismarck plate.

Boundaries and Movement

The north and northeast boundaries of the Manus plate, with the North Bismark and Pacific plates are both convergent boundaries.{{Cite web|title=ODP Leg 193: Manus Basin\|url=https://mlp.ldeo.columbia.edu/BRG/ODP/ODP/LEG_SUMM/193/leg193.html|website=mlp.ldeo.columbia.edu|access-date=2020-03-18}} The plates southeast borders of the South Bismark plate is a divergent boundary. The southwest boundary bordering the South Bismark plate is a transform boundary. The Manus plate currently has a rate of rotation of 51°/ Ma at the spot, -3.04°N, 150.46°E, in the counter-clockwise direction, due to the plates left lateral motion.{{Cite journal|last1=Martinez|first1=Fernando|last2=Taylor|first2=Brian|date=1996-06-01|title=Backarc spreading, rifting, and microplate rotation, between transform faults in the Manus Basin|journal=Marine Geophysical Researches|language=en|volume=18|issue=2|pages=203–224|doi=10.1007/BF00286078|bibcode=1996MarGR..18..203M |s2cid=128798965|issn=1573-0581}} This is likely the fastest plate rotation, on Earth at this time.

References

Category:Tectonic plates

Category:Geology of the Pacific Ocean