变质作用与大地构造环境（metamorphism and plate tectonics）

freegis

1. 内容提要

复制代码

大陆地壳深俯冲发生的必要条件：
1）必须具有大洋岩石圈的俯冲和消亡
2）必须是被动大陆边缘

Ultrahigh-pressure(UHP) metamorphism
石英的相变
石英－柯石英P >2.6 GPa
柯石英—斯石英P > 8GPa

Continent-Continent Collisions

Rapidcrustal thickening

during continental collisionsproduces

hightemperatures

because of the large amount of radiogenic elements incontinental crust. The pressures are

moderate

because continentalcrust is never thicker than ~75 km(2.5 GPa). These abnormally high temperatures are followed by

coolingto a normal cratonal geotherm

. This is the cause of so-called

"Barrovian"metamorphism

, signature minerals of which are

staurolite + kyanite

.Good examples are known from the Tibetand Himalaya.

TheIndia-Asia collision zone

is our best example of

an activecontinent-continent collision

.

freegis

变质作用与大地构造环境（metamorphism and plate tectonics）

freegis

变质作用与大地构造环境（metamorphism and plate tectonics）.part2

laomeng

谢谢分享啊--------------------------

laomeng

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slj123

哈哈 高中知识 [s:204]

xiaobaitianci

英语版本的？

xiaobaitianci

穷得我不断的回帖！

xiaobaitianci

怎么回复这么多都还不能下啊！

tjddzx

感谢分享!