摘要
在挪威某些正岩浆铜镍矿床的矿石中，六万磁黄铁矿基质内的单斜磁黄铁矿叶片是高温时形成的磁黄铁矿固溶体在降温过程中出溶的产物。出溶叶片宽度和间距的加大、叶片的带状分布、楔形尖端、箱状扭曲和复杂叶片等结构，表明出溶产物在不高于单斜-六方转变温度（254℃）的条件下发生过显著的退火和粗化。重结晶的六方磁黄铁矿基质中所保存的单斜变种甚少，表明变质作用所引起的矿石重结晶，可使磁黄铁矿吸收其中的单斜出溶体而发生均匀化。
Monoclinic pyrrhotite lamellae within hexagonal pyrrhotite matrix in the ores from some orthomagmatic copper-nickel deposits of Norway were produced by exsolution from pyrrhotite solid solutions formed at higher temperatures during cooling. lncrease of lamella width and spacing and textures like lamella zonation, wedge-shaped ends, boxwork and composite lamellae suggest that lamellae in these ores have suffered annealing and coarsening at temperatures not higher than 254℃, the transformation temperature from monoclinic to hexagonal pyrrhotite. The poor preservation of the monoclinic variety in the matrix of hexagonal pyrrhotite that was once subjected to recrystallization and annealing indicates that recrystallization of ores caused by metamorphism will make pyrrhotite homogenized by erasing monoclinic lamellae inside it.
出处
《矿物学报》
CAS
CSCD
北大核心
1997年第1期17-23,共7页
Acta Mineralogica Sinica
关键词
磁黄铁矿
铜矿石
镍矿石
退火
硫化物矿床
粗化
pyrrhotite
sulphide
solid solution
exsolution
annealing
coarsening
