Unformatted text preview: compositionally immature. (2) A feldspar rich sample is compositionally immature, which is consistent with textural immaturity, therefore this is possible. (3) A quartz rich sample is compositionally mature, which is not consistent with the degree of transport typical of a texturally immature sample and the removal of unstable minerals or lithic fragments. 3. The most important information to be obtained from a rock fragment is the lithology of the source rock because the lithic fragment is a direct representation of source lithology. Lithic fragments can help determine compositional maturity; however, not all lithic fragments mean immaturity. Some lithic fragments (limestone fragments) are easily broken down but others (chert, quartzite) are very resistant. So, if you use lithic fragments to determine compositional maturity, you do need to determine the type of lithic fragment....
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- Spring '10
- 15%, 2 pts, 2pts, 1.5 pts, texturally immature sample