Premium
A Study on Palaeogeography and Metallogenic Conditions of Early Carboniferous Bauxite Deposits of Old Weathered Crust in Guizhou, Sichuan, Hunan and Hubei Provinces 1
Author(s) -
Shifan Liao
Publication year - 1989
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.1989.mp2004005.x
Subject(s) - bauxite , geology , crust , geochemistry , carboniferous , denudation , weathering , fault (geology) , laterite , mining engineering , earth science , geomorphology , paleontology , tectonics , structural basin , materials science , metallurgy , nickel
There are four subtypes, namely, la, lb, 1c and Id of the Early Carboniferous bauxite deposits of the old weathered crust type in Guizhou, Sichuan, Hunan and Hubei provinces. They are all distributed in the Upper Yangtze old land. As a result of the Hunan‐Guizhou palaeo‐faulting, the crust on the northern side of the fault was uplifted and became land, thus suffering denudation. The bauxitic substances left in the weathered crust evolved and were reworked into bauxite. On the other hand, the crust on the southern side of the fault sank and remained to be part of an ocean. The bauxite deposits of la and lb subtypes were formed by in‐situ enrichment of residual bauxitic substances in the weathered crust of the old land, but bauxite deposits of 1c and Id subtypes resulted from transportation, accumulation and sedimentation of allothogenous bauxitic substances on the weathered crust of the old land. The processes of transportation may be distinguished as dry transportation and wet transportation, both of which proceeded under atmospheric conditions.