Paleoclimatic information was gained based on the sedimentary characteristics and criteria,clay mineral assemblage types and CaCO3 index recorded by these sections.

Features of platinum-group elements in different mineral assemblages in the Lower Cambrian black rock series in Hunan and Guizhou;

When carbonates are dissolved by hydrothermal fluids, some mineral assemblages, typical of hydrothermal genesis, would precipitate from the hydrothermal fluids.

According to analysis of metallic mineral assemblage,compositions and fluid inclusions,it is concluded that the metallic minerals were mainly formed in a high sulfur fugacity and reduced environment.

Based on directions of palaeo-flow, mineral combination characteristic and REE characteristic in Ordos Basin, directions of palaeo-flow of the early Yanchang Formation comes from circum to center, and five source directions can be found, which are northeast, east, south, southwest and northwest directions.

The northern Guangdong is the most important large concentration uranium area with granite,in the summary of the characteristics of general mineralogy 、mineral combination、occurrence and causes,and in the research of ulrichile with detecting in north of Guangdong,it found that ulrichile often symbiotic with the deputy minerals of magnetite、ilmenite、pyrite、monazite、apatite、Xenotime and so on.