carbonaceous siliceous-pelitic rock type U-ore

例句：

1. 1. The rocks are carbonaceous and have a distinctive mineral composition.
   这些岩石是含碳质的，具有独特的矿物组成。
2. 2. The carbonaceous material is used in the production of high-quality steel.
   这种含碳材料用于生产高质量的钢材。
3. 3. The carbonaceous rocks were formed by the weathering of ancient volcanic ash.
   这些含碳岩石是由古代火山灰的风化形成的。