An Experimental Melting—crystallization Study on Basalt at High Pressures |
| |
摘 要: |
|
关 键 词: | 高压条件 玄武岩 大晶体 结晶 熔融 上地幔 |
An experimental melting-crystallization study on basalt at high pressures |
| |
Authors: | Ren Guohao Xie Hongsen Xie Xiande |
| |
Institution: | (1) Wuhan University of Technology, 430070 Wuhan;(2) Institute of Geochemistry, Academia Sinica, 550002 Guiyang |
| |
Abstract: | A series of melting-crystallization experiments on alkali basalt samples from Minqing, Fujian Province was carried out in
dry and waterbearing systems at high pressures. A high-pressure melting curve was obtained. The results indicate that clinopyroxene
crystallized from basalt melt at 13.5–23.7 kbar. spinel at 23.7–28.6 kbar and garnet at > 28.6 kbar. With increasing pressure,
the CaSiO3 contents of clinopyroxenes increase; and the FeSiO3 decreases, but the chemical composition of garnet does not show any significant difference. The minerals are larger and euhedral
in the water-bearing system. Therefore, we consider that natural megacrysts of the basalt can crystallize from the water-bearing
basalt magma at high pressure. So the megacrysts may be derived from the upper mantle as a result of magmatic crystallization-fractionation
under high pressure.
This project was financially supported by the National Natural Science Foundation of China. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |