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Earth and Space Sciences · 术语表

什么是 Parent rock; saprolite？

又称： parent rock · saprolite

Definition 7.1 High School Earth and Space Sciences · 第 7 章 — Soil, a Slow-Forming Resource

The parent rock of a soil is the rock from which its mineral part was formed. Saprolite is rock decomposed in place by weathering: soft and earthy, it still shows the grains and the structure of the parent rock. A weathering profile is the whole column from the fresh rock, through the saprolite, to the soil at the top.

Saprolite in a road cut in central Madagascar: the old gneiss, decomposed in place, still shows its bands as streaks of white clay in red earth. Photograph: Diorit (CC BY-SA 3.0).
Saprolite in a road cut in central Madagascar: the old gneiss, decomposed in place, still shows its bands as streaks of white clay in red earth. Photograph: Diorit (CC BY-SA 3.0).
Two weathering profiles on the same rock (schematic, not to scale): under a hot, wet climate the profile is much thicker and its top is a laterite; under a temperate climate a thinner saprolite carries the soil.
Two weathering profiles on the same rock (schematic, not to scale): under a hot, wet climate the profile is much thicker and its top is a laterite; under a temperate climate a thinner saprolite carries the soil.
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