Time filter

Source Type

Xiang Z.,Henan Polytechnic University | Gu X.,China University of Geosciences | Zhang Y.,China University of Geosciences | Yang W.,China University of Geosciences | And 4 more authors.
Earth Science Frontiers | Year: 2014

As 3D geological information technology is improving, the 3D prediction becomes an important method and developing trend for large scale deep metallogenic prediction,. By taking 313# vein of the Liubagou gold field, Inner Mongolia as a case study, the paper discusses the technical procedure and method of large scale 3D deep prospecting prediction from comprehensive information based on 3D geological modeling and visualization. Through building geological entity model such as strata, faults, rock dyke, ore body and alteration zone, and visibly analyzing the ore-forming geological conditions, the authors constructed the prospecting model of synthetic information on the K-feldsparization and silication type of gold ore combined with 3D anomaly analysis on primary halos, delineated and estimated three prospect areas with the method of element overlay through establishing block mode and quantifying 3D metallogenic prognosis factors. The results show that the Mid-Eastern deep area has a good potential for prospecting minerals and that the large scale prediction method based on 3D geological modeling and visualization technology is very effective. Source

Zhang Y.,China University of Geosciences | Gu X.,China University of Geosciences | Peng Y.,China University of Geosciences | Zheng L.,China University of Geosciences | And 4 more authors.
Earth Science Frontiers | Year: 2014

The Bonga carbonatite complex in Angola belongs to the Paraná-Angola-Etendeka Igneous Province. It crops out as an isolated circular plug in the Precambrian crystalline basement along the intersection of faults. Petrographically, the complex consists of syenite, carbonatite and fenite with some tephritic-phonolitic eruptive breccias. The carbonatite is mainly composed of calcite with minor pyrochlore, apatite, magnetite, fluorite and REE minerals. Enriched in pyrochlore, Bonga is a giant magmatic carbonatite-type niobium deposit. Chemically, the carbonatite belongs to sovite (Ca-carbonatite) and ferrocarbonatite, has high contents of Sr, Ba, Mn, Nb, Th and LREE, and is depleted in K, Ti and U with no Ce and Eu anormalies. These geochemical features indicate that the Bonga intrusion is similar to the other typical igneous Ca- and Fe-carbonatites in the world. Zr/Hf and Y/Ho ratios and normalized Y contents of the rocks suggest that the Bonga carbonatite belongs to a highly evolved magmatic system, transitional between pure melts and hydrothermal fluids. The Bonga niobium deposit formed during magmatic and hydrothermal periods. Reddish brown euhedral pyrochlore (flurocalciopyrochlore and hydroxycalciopyrochlore) crystalized during the early magmatic period, while formation of yellowish green sub-euhedral to anhedral pyrochlore (kenocalciopyrochlore) occurred later during the hydrothermal event. Source

Discover hidden collaborations