西藏罗布莎铬铁矿穆斯堡尔谱特征及其地质意义

讨论了在温度为３００Ｋ条件下罗布莎铬铁矿穆斯堡尔谱的特征。根据谱形将全谱分民三套双峰，其中中第Ⅰ、第Ⅱ 由四面体中的Ｆｅ＾２＋产生的，第Ⅲ套是由八面体中Ｆｅ＾３＋产生的；总结出了中心位移值与铬铁矿平衡压力以及四级分裂值（ＱＳ），铬铁矿平衡温度之间的关系；探讨了铬铁矿的成国在。研究结果表明，铬铁矿穆斯堡尔谱的两上重要参数δ和ＱＳ在铬铁矿成矿预测中可以 作为矿物学标型特征来推测矿床的成因，参数的质量达

CHARACTERISTIC M(O)SSBAUER SPECTRA AND THEIR GEOLOGICAL SIGNIFIC ANCE OF CHROMITE IN LUOBUSHA,TIBET(XIZANG)

Mssbauer spectra of chromite from Luobusha deposit have been recorded at the temperature of 300 K.Based on the mssbauer patterns,all the spectra are fitted by three boublets:the first two are attributed to the tetrahedral site Fe 2+ ,the third to the octahedral site Fe 3+ .This paper summarizes the relation of the centre shifts with the chromite quilibrium pressure and the guadrupole splittings with the chromite quilibrium temperature,and investigates the genesis of chromite.Results show two chief parameters of mssbauer spectra of chromite.The centre shifts and the guadrupole splittings are inferred as the deposit genesis with the typomorphism characteristics of mineralogy in the minerogenetic prediction of chromite.The qualities of parameter satisfy the demand of minerogenetic prediction of chromite bodies.