Abstract:

Ronghua manganese deposit located in the the Baifeng Formation in Triassic Baifeng stratum is initial reported as industrial deposit. Based on large-scale geological survey, exploration project, analytical testing and other means, we study the geological background, sedimentary environment, ore body and ore characteristics, sedimentary evolution, and so on. Ronghua manganese deposit, in which the ore bodies are controlled by the stratigraphy and structure, are distributed along the layers of mudstone,muddy siltstone and marl in Baifeng Formation, belonging to deposited-leaching cap-type manganese deposits. The lowgrade ore associated Co and other metal elements consists of pyrolusite and other manganese oxide minerals. The carbonate under Baifeng Formation and turbidite conglomerate upper part of the first segment in Baifeng Formation are typical prospecting signs in northwest Guangxi where there is a large number of Baifeng Formation outcrop. There were terraces surrounded by basins in Triassic northwest Guangxi region. Such Mn-rich terraces formed in the late Paleozoic suffer from weathering denudation and the ore-forming elements were brought into the basins. When the Tethys Ocean closed, the manganese initial enrichment in the first segment in Baifeng Formation under the condition of basin area reduced, the water level deepened and fluctuations in the redox interface as the basins suffered compression. The oxide manganese deposits were ultimately formed through weathering and leaching, then Youjiang Basin uplift out of the water and began to accept the denudation.

Key words: Ronghua manganese deposit, Baifeng Formation in Triassic, oxide manganese , prospecting potential, Guangxi