摘要
本文提出了一种更切合实际的NBO/T值计算方法。挥发分对熔体结构影响较大,计算NBO/T值时必须予以考虑。岩浆岩是岩浆在演化过程中逸失大量挥发分后冷却结晶的产物,需用热力学方法计算熔体的挥发组分特别是水的含量。水主要由OH^-对NBO/T值产生影响,提出了计算熔体X_(OH)和相应调整其他氧化物在熔体中含量的公式。对于H_2O、F、CO_2和P_2O_5如何参加计算的问题也作了讨论。
This paper proposes a calculation method of NBO/T value that is more conformable to reality. Volatile components exert a larger effect on the melt structure, and must be taken account for the calculation of NBO/T value. The igneous rock in nature is the final product formed by cooling and crystallization of melt in which large amounts of volatile components have generally been lost during melt evolution. Therefore, it is necessary that the volatile in melt is recalculated by thermodynamic methods. As for water, the paper considers, it is the OH-that effects on NBO/T value. The paper brings up the formulas concerning calculating XoH (OH mol‰) and correspondingly readjusting other oxide content. A new opinion is suggested on the participation of H_2O、F、CO_2 and P_2O_5 in the calculation. An example that gives detailed illustration of the plocess for the calculation of NBO/T is given.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
1990年第3期72-77,共6页
Acta Petrologica Sinica
关键词
岩浆岩
岩浆
熔体
NBO/T值
Melt structure
NBO/T
Nonbridging oxygen
Melt composition
