STRUCTURAL OH IN MANTLE-DERIVED CLINOPYROXENE MEGACRYSTS FROM NUSHAN

Thirteen clinopyroxene megacrysts from Nushan Cenozoic basalts have be en investigated by Fourier transform infrared spectrometer(FTIR). The results demonstrate that all samples contain trace amount of structura l OH. Clinopyroxenes from Nushan show four groups of absorption bands, in which, 3 472-3 506 cm(-1) is the major characteristic one. It is s uggested that the position of major band is probably related to Al con tent: the position of major characteristic band for high-Al samples is around 3 470 cm(-1), whereas that for low-Al samples around 3 620 cm( -1).