摘要
利用天然体系相平衡数据对于17种较为常用的地质温度计进行了检测评价。结果表明:(1)Bertrand and Mercier(1985)提出的二辉石温度计是目前为止最适合用于幔源包体的温度估计,其推导方法也有普遍意义。本文利用这一温度计,根据中国东部,德国Westeifel,法国Massif Central以及蒙古Tarat等地的橄榄岩包体的矿物化学数据,推导了Ca单斜辉石经验温度计: T(℃)=1575+288.64×ln[1—Ca/(1—Na)]_(Cpx)(2)国内广泛使用的Mercier单辉石温度计常常会造成±100℃的估算误差,而Wood-Banno法,Wells法的使用只限于特定的区间。本文还推荐了几种单辉石温度计,这些相对独立的温度计的综合使用,在研究单一元素的化学平衡及反应动力学问题时具有重要意义。
We have tested 17 commonly used geothermometers using the available natural system reequilibration data. Our results show that the two-pyroxenes geothermometer proposed by Bertrand and Mercier(1985)is the best one update for estimating temperatures of the mantle peridotite xenoliths. Their method of calibration also has a general significance. Based on this geothermometer and the mineral chemistry data of the mantle peridotites from Eastern China, West Eifel, Germany, Massif Central, France and Tariat, Mongolia, we have calibrated an empirical Ca-clinopyroxene thermometer:
T(℃)=1575.1+288.64×In[1—Ca/(1—Na)]_(Cpx) where Ca and Na are the atomic numbers per structural formulae(6 oxygens for pyroxenes). It is, furthermore, indicated that the widely used single-pyroxene geothermometers of Mercier (1980) could yield an estimation error of ±100℃, while Wood and Banno (1973) and Wells (1977) geothmometers are only applicable within the stricted temperature range. Finally, we have studied the problems of chemical equilibrium and of the kinematics of subsolidus reactions.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第2期167-180,共14页
Acta Petrologica Sinica
