Search results
Results From The WOW.Com Content Network
Most island arcs originate on oceanic crust and have resulted from the descent of the lithosphere into the mantle along the subduction zone. They are the principal way by which continental growth is achieved. [1] The Ryukyu Islands form an island arc. Island arcs can either be active or inactive based on their seismicity and presence of ...
A number of microplates exist between the two major plates and host various back-arc structures of which the largest are the volcanic Tonga–Kermadec Ridge, the actively spreading Lau Basin and the Havre Trough. At the southern end there is a transition to the transform faults of the South Island of New Zealand.
The IBM arc system is an excellent example of an intra-oceanic convergent margin (IOCM). IOCMs are built on oceanic crust and contrast fundamentally with island arcs built on continental crust, such as Japan or the Andes. Because IOCM crust is thinner, denser, and more refractory than that beneath Andean-type margins, study of IOCM melts and ...
No metamorphic rocks, volcanic arcs, or granitic intrusives associated with the Antler orogeny have been directly correlated with the Antler Orogeny; however, there is some evidence of arc magmatism in northern California that may be attributed. Intrusive bodies include Bowman Lake batholith, Wolf Creek granite stock, and smaller hypabyssal ...
The islands of Japan were separated from mainland Asia by back-arc spreading.. The islands of Japan are primarily the result of several large ocean movements occurring over hundreds of millions of years from the mid-Silurian to the Pleistocene, as a result of the subduction of the Philippine Sea Plate beneath the continental Amurian Plate and Okinawa Plate to the south, and subduction of the ...
The Izu–Ogasawara Trench lies south of Japan. The Izu–Ogasawara Trench (伊豆・小笠原海溝, Izu–Ogasawara Kaikō), also known as Izu–Bonin Trench, is an oceanic trench in the western Pacific Ocean, consisting of the Izu Trench (at the north) and the Bonin Trench (at the south, west of the Ogasawara Plateau).
The ]]Mariana Trough]] is located on the western side of the island arc along with the back arc basin. Around 3 Ma the basin began spreading at 4.7 cm/yr. [6] Due to the back arc spreading in the Mariana Trough the islands are moving east while the Philippine Sea plate is staying almost stationary. [4]
This boundary between the Burma and Sunda plates is a marginal seafloor spreading centre, which has led to the opening up of the Andaman Sea (from a southerly direction) by "pushing out" the Andaman-Nicobar-Sumatra island arc from mainland Asia, a process which began in earnest approximately 4 million years ago.