板塊的移動-關於海洋地殼隱沒 - 地球科學討論
By Sandy
at 2011-01-08T17:19
at 2011-01-08T17:19
Table of Contents
最近正準備構造地質學的考試 在板塊邊界聚合的部份遇到一點問題
用密度來解釋的話 可以想做是板塊浮在軟流圈上 軟流圈密度較高
又 板塊的運動是被動的 主要來自於ridge push 和 slab pull
問題在於「海洋板塊一旦隱沒 就會因為本身重量持續下沉」這句話
密度低的板塊要如何持續下沉呢? 我查了海洋地殼與榴輝岩的密度
發現大概都只在三左右 到底要怎麼解釋 slab pull 的來源?
還是說隱沒不只看海洋地殼 還要把海洋岩石圈地幔一併算進去?
感謝強者解惑
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