原生型矿床中主要铀矿物是晶质铀矿，改造型矿床中的主要铀矿物是沥青铀矿和残余的晶质铀矿。

The principal uranium mineral in the deposits of primary subtype is uraninite, but in reworked subtype are pitchblende and relict uraninite.

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当蚯蚓消化死亡植物的残余物时，它们就将残余物变成能够维系植物树木生长的微量矿物质和其它养分。

As the worms ingest the remains of the dying plants they reduce the remains into trace minerals and other nutrients that then sustains the life of the plants and trees.

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测定碎屑矿物沉积后吸收的古剂量是第四纪沉积物热释光测年的关键。测定古剂量的方法有三种，即部分晒退法、残余热释光法和再生热释光法。

Determination of the paleodose absorbed by debris minerals in sediments after deposition is a key course for TL dating of the Quaternary sediments.

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