为查明粒度和分选作用对沉积物REE配分的影响．Crichton等（1993）对比了怀俄明州东南部年龄为2.0Ga的Libby溪群的石英岩、泥质岩和冰碛......

Over a 70-year period, a mine near Libby, MT supplied nearly 80% of the world’s vermiculite. Raw vermiculite, which was......