洋陆辐合板块边界
Section outline
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What do you see when oceanic lithosphere subducts?
::当海洋平流层下水道时 你看到什么了?At a convergent plate boundary , when one plate is oceanic, there are large . These volcanoes are found in lines that outline the subduction zone . also happen in these zones. The Aleutian Islands that border southern Alaska are an island arc . In this winter image from space, the volcanoes are covered with snow .
::在聚集的板块边界上,当一个板块是海洋的时,就会发现大火山。这些火山在勾画下潜带的线条中发现。在这些地区也会发生。阿拉斯加南部接壤的阿留申群岛是一个岛屿弧。在这个冬天,从太空看,火山被雪覆盖。Convergent Plate Boundaries
::一致的盘点边界A convergent plate boundary forms where two plates collide. That collision can happen between a continent and oceanic crust , between two oceanic plates, or between two continents. Oceanic crust is always destroyed in these collisions.
::聚集板块的边界形成两块板块碰撞。 大陆和大洋地壳之间、两个大洋地块之间或两个大陆之间可能发生碰撞。 在这些碰撞中,海洋地壳总是被摧毁的。Ocean-Continent Convergence
::大洋-大陆汇合Oceanic crust may collide with a continent. The oceanic plate is denser, so it undergoes subduction . This means that the oceanic plate sinks beneath the continent. This occurs at an ocean trench ( Figure ). Subduction zones are where subduction takes place.
::海洋地壳可能会与大陆相撞。 海洋板块密度更高, 所以会潜入。 这意味着海洋板块会沉入大陆下。 这发生在海洋战壕( 图 ) 。 潜入区是进行潜入的地方 。Subduction of an oceanic plate beneath a continental plate forms a line of volcanoes known as a continental arc and causes earthquakes. As you would expect, where plates collide there are lots of intense earthquakes and volcanic eruptions. The subducting oceanic plate melts as it reenters the mantle. The magma rises and erupts. This creates a volcanic mountain range near the coast of the continent. This range is called a continental arc . The Andes Mountains, along the western edge of South America, are a volcanic arc ( Figure ).
::正如你们预期的那样,在板块相撞的地方,有许多强烈的地震和火山爆发。沉积的海洋板块在重新进入地壳时融化。岩浆上升和喷发。这在大陆海岸附近创造了火山山脉。这个山脉被称为大陆弧。南美洲西部边缘的安第斯山脉是火山弧(图 )。A relief map of South America shows the trench west of the continent. The Andes Mountains line the western edge of South America. Ocean-Ocean Convergence
::海洋海洋汇合Two oceanic plates may collide. In this case, the older plate is denser. This plate subducts beneath the younger plate. As the subducting plate is pushed deeper into the mantle, it melts. The magma this creates rises and erupts. This forms a line of volcanoes, known as an island arc ( Figure ). Japan, Indonesia, the Philippine Islands, and the Aleutian Islands of Alaska are examples of island arcs ( Figure ).
::两块海洋板块可能会相撞。 在这种情况下, 旧的板块会更稠密。 这个板块在较年轻的板块下方的下水道。 当该板块被推入地壳深处时, 它会融化。 岩浆会产生起伏和喷发。 这形成了一条火山线, 被称为岛屿弧( 图 ) 。 日本、 印度尼西亚、 菲律宾群岛和阿拉斯加的阿利乌提群岛就是岛屿弧( 图 ) 的例子 。A convergent plate boundary subduction zone between two plates of oceanic lithosphere. Melting of the subducting plate causes volcanic activity and earthquakes. The country of Japan is an island arc that lies at the intersection of the North American, Filipino, and Eurasian plates. Colors in this picture indicate elevation. Summary
::摘要- When two plates come toward each other, they create a convergent plate boundary.
::当两个盘子相撞时,它们就形成了一个集合盘子的边界。
- If at least one plate is oceanic, there will be subduction.
::如果至少有一个板块是海洋的, 就会有潜入。
- Subduction of a plate leads to melting and volcanism.
::摄取一个板块会导致熔化和火山活动。
- An island arc is a line of volcanoes on an oceanic plate. A continental arc is a line of volcanoes on a continental plate.
::环岛弧是大洋板块上的火山线,大陆弧是大陆板块上的火山线。
Review
::回顾- What is the direction of plate motion at a convergent plate boundary?
::板块运动的方向是什么? 在集合板块边界?
- What creates an island arc?
::是什么创造了一个岛弧?
- How is a continental arc different from an island arc?
::大陆弧与岛屿弧有何不同?
- When two plates come toward each other, they create a convergent plate boundary.
