大洋中脊脊或沟吗?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 07 - 10 - t19:31:44z //www.hoelymoley.com/feeds/question/13217 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/13217 12 大洋中脊脊或沟吗? 豪猪 //www.hoelymoley.com/users/12045 2018 - 01 - 28 - t19:56:23z 2021 - 08 - 14 - t00:31:58z < p >我困惑在阅读文本来自不同来源的冲突。例如,我读到不同的海洋板块形成山脊。< a href = " https://www.youtube.com/watch?v = Wq9kLzm36h0 nofollow noreferrer“rel = >《国家地理》< / >调用中大西洋脊谷!< / p > < p >另一方面,< a href = " https://en.wikipedia.org/wiki/Mid-Atlantic_Ridge " rel = " nofollow noreferrer " >维基百科< / >状态:< / p > < blockquote > < p >大西洋洋中脊包含一个裂谷深处,沿着山脊的轴线沿近它的整个长度。这个裂痕是实际的相邻的板块之间的边界上,岩浆从地幔到达海底,喷发的熔岩和产生新的地壳物质盘子。< / p > < /引用> < p >按< a href = " https://en.wikipedia.org/wiki/Trench " rel = " nofollow noreferrer " > < / >:维基百科裂谷是一种沟! < / p > //www.hoelymoley.com/questions/13217/-/13218 # 13218 20. 好回答的是大洋中脊脊或沟? //www.hoelymoley.com/users/2570 2018 - 01 - 28 - t21:08:06z 2018 - 01 - 28 - t21:08:06z < p >沟都有特定的意义在板块构造。它不仅仅指任何谷;它具体是指形成于俯冲带的特性下行大洋板块的挠曲。一个典型的例子是马里亚纳海沟最深处的位置在海洋中< / p > < p > < A href = " https://i.stack.imgur.com/QI2yh.gif " rel = " noreferrer " > < img src = " https://i.stack.imgur.com/QI2yh.gif " alt = "在这里输入图像描述" > < / > < / p > < p >快速传播山脊确实有山谷的中心,但这些通常不称为战壕,以避免混乱。在缓慢蔓延山脊山谷经常塞满了熔岩爆发。然而,谷坐落在一个更大的山脊之上,这是热地幔上涌的表面表达以下传播轴。< / p > < p > < a href = " https://i.stack.imgur.com/lA2PQm.jpg " rel = " noreferrer " > < img src = " https://i.stack.imgur.com/lA2PQm.jpg " alt = "在这里输入图像描述" > < / > < / p > //www.hoelymoley.com/questions/13217/-/13445 # 13445 5 回答垒球火星的大洋中脊脊或沟吗? 垒球火星 //www.hoelymoley.com/users/12307 2018 - 02 - 25 - t21:21:44z 2018 - 02 - 25 - t21:35:46z < p >让我们首先澄清术语:< / p > < h3 >沟< / h3 > < p > < / em >的< em >海沟,随着@bon中描述他们的回答,是形成构造板块移动<强>对< /强>和一个板块下俯冲。@bon也提供了启发性的插图。The German term for an oceanic trench is Tiefseerinne (literally "deep sea groove").

rift-valley or graben

A graben or rift valley is formed where tectonic plates move away from each other and part of the broken crust sinks. The illustration below is from Wikipedia. The German term for a graben is Graben (literally "trench").

Graben

Now that we know the terminology, we can look at the Mid-Atlantic Ridge.

Mid-Atlantic Ridge

The Mid-Atlantic Ridge has been created by seafloor spreading: the plates drift apart and the rift is filled with magma from below. The resulting new crust is warmer than the older material surrounding it and therefore has higher buoyancy: it floats more easily and rests higher on the magma below, forming a ridge in relation to the colder, older, more heavy material around it.

You can see this beautifully in the second illustration that @bon has provided: The crust is not thicker under the rift, rather it floats up.

So the ridge is a ridge, not a trench, but the rift valley along its length is not a trench either, but a graben: it has been formed by tectonic plates moving away from each other and parts of the separating ridge breaking off its edge and sinking into the rift.

//www.hoelymoley.com/questions/13217/-/20203 # 20203 1 答案由phina odumodu是大洋中脊脊或沟吗? phina odumodu //www.hoelymoley.com/users/21080 2020 - 09 - 14 - t13:49:15z 2021 - 08 - 14 - t00:31:58z < p >地堑/裂谷是更适应离散板块环境中作为一个沟主要是使用和接受汇聚板块活动讨论时,其他聪明的两个描述相同的地质特征/意义。

The German term for a graben is Graben (literally "trench").

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