Distribution of anatectic melt during differentiation of the continental crust

大陆地壳分异过程中深熔熔体的分布

• 批准号: 1928-2010
• 负责人: Sawyer, Edward
• 金额: $ 2.55万
• 依托单位: Université du Québec à Chicoutimi
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2011
• 资助国家: 加拿大
• 起止时间: 2011-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=473544
• 关键词: Distribution; anatectic; melt; during; differentiation

The continental crust can reach temperatures over 800 degrees celsius at depths greater than 30 kilometres. At this temperature most rocks have started to melt, making granite liquid and a solid residue. The granite liquid is less dense and rises. Thus, the upper 15 kilometers of the crust is more granitic in composition, and the lower crust less granitic, than the crustal average. The crust is differentiated by this process. But the composition of the residue, tells us that more granite was made than reached the upper crust; some got stuck between the lower and upper crust.

在深度超过30公里的地方，大陆地壳的温度可以达到800摄氏度以上。在这个温度下，大多数岩石已经开始熔化，形成花岗岩液体和固体残留物。花岗岩液体密度较低，会上升。因此，与地壳平均水平相比，地壳上部15公里处的花岗岩成分较多，而下部地壳的花岗岩成分较少。地壳在这一过程中被区分开来。但残留物的成分告诉我们，形成的花岗岩比到达上地壳的花岗岩多；一些花岗岩卡在下地壳和上地壳之间。