吉林省南部下元古界的变质不纯碳酸盐岩

THE LOWER PROTEROZOIC METAMORPHOSED IMPURE CARBONATITE IN SOUTHERN JILIN

吉林省南部下元古界集安群、老岭群不纯碳酸盐岩发生变质反应时流体成分的变化受不同因素的控制,集安群不纯碳酸盐岩中流体成分的变化受缓冲作用控制,老岭群不纯碳酸盐岩中流体成分的变化受缓冲加渗滤作用控制;变质温压条件为560℃±、300MPa±。

The compositional change of the fluids in the impure carbonatite of the lower Proterozoic Ji'an Group and Laoling Group in southern Jilin was con rolled by different factors when the metamorphic reaction occurred. The compositional change of the fluids in the Carbonatiteof the Ji'an Group was controlled by the buffer reaction and that in the carbonatite of the Laoling Group, by tile buffer reaction and percolation. The metamorphic temperature and pressure are 560℃±and 300 Mpa±respectively.