The Manus plate is a 100-km 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.
6-616: The Manus plate formed during the Brunhes-Matuyama reversal , making its maximum age approximately 781,000 years old. 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. The north and northeast boundaries of
12-499: Is a highly speculative theory that connects this reversal event to the large Australasian strewnfield (c. 790,000 years ago), although the causes of the two are almost certainly unconnected and only coincidentally happened around the same time. Adding to the data is the large African Bosumtwi impact event (c. 1.07 million years ago) and the later Jaramillo reversal (c. 1 million years ago), another pair of events which has not gone unnoticed. This geophysics -related article
18-454: Is likely the fastest plate rotation, on Earth at this time. 3°02′13″S 150°27′22″E / 3.0370°S 150.4560°E / -3.0370; 150.4560 This tectonics article is a stub . You can help Misplaced Pages by expanding it . Brunhes%E2%80%93Matuyama reversal The Brunhes–Matuyama reversal , named after Bernard Brunhes and Motonori Matuyama , was a geologic event, approximately 781,000 years ago, when
24-550: The Earth's magnetic field last underwent reversal . Estimations vary as to the abruptness of the reversal. A 2004 paper estimated that it took over several thousand years; a 2010 paper estimated that it occurred more quickly, perhaps within a human lifetime; a 2019 paper estimated that the reversal lasted 22,000 years. The apparent duration at any particular location can vary by an order of magnitude, depending on geomagnetic latitude and local effects of non-dipole components of
30-764: The Earth's field during the transition. The Brunhes–Matuyama reversal is a marker for the Global Boundary Stratotype Section and Point (GSSP) defining the base of the Chibanian Stage and Middle Pleistocene Subseries at the Chiba section, Japan, which was officially ratified in 2020 by the International Union of Geological Sciences . It is useful in dating ocean sediment cores and subaerially erupted volcanics. There
36-609: The Manus plate, with the North Bismark and Pacific plates are both convergent boundaries . 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. This
#698301