Study on Lithofacies Palaeogeography during Permian Emeishan basalt explosion in Guizhou Province, China
Chen Wenyi Liu Jiaren Wang Zhonggang Zheng Qiqian
Guizhou Bureau of Geology and Mineral Resource Exploration& Development, Guiyang 550004, Guizhou
Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, Gguizhou
Explosion phases of the Emeishan basalt in Guizhou, from intensity and time of explosion, are divided into late Maokou phase and Longtan phase (or Wujiaping phase). The Longtan phase is subdivided into 3 explosion cycles, corresponding to 4 different environments of lithofacies palaeogeography. It is showing that Dongwu Movement caused elevating and subsiding of the earth crust, with regression and transgression, following elevating, spreading and cracking (or called as Emeishan cracking), and mantle material exploiting discontinuous and cycle. The interrelationship between process of the Emeishan basalt explosion and sedimention process is revealed through study on the base of evolution of palaeogeography in Permian, and relationship between Au and Sb deposits and the Emeishan basalt explosion and the evolution of palaeogeography is discussed in this study, authors set up the models of relationship between lithofacies and minerogenetic province. It can be seen that the sediment cycles and the distribution of lithofacies in Maokou Stage and Early Longtan Stage is consistent with the Emeishan basalt explosion episodes and cycles. The Emeishan basalt explosion supplies a lot of material to form mineral resource, and intervals of the Emeishan basalt explosion are favorable to deposit abundant and different deposits. The basalt is rich in Si and CO2 during the gas-hydrate interval of magma effusion process, and rich in Fe, Mn, Cu, Pb, Zn, Sb, Hg, As, Au, Ag, F, P and rare and radioactive elements. The distribution of mineral regions (such as volcano-gas-hydrate mineral region, volcano-sediment mineral region and sediment mineral region) is controlled by distance from crater and magma, and volcano composition and mineral environment.
About author: Chen Wenyi, born in 1933, graduated from the Department of Earth Sciences, Nanjing University in 1954. He was a chief engineer of Team of Regional Geological Survey, and is engaged in regional geology, mineral geology and lithofacies palaeogeography.
Cite this article:
. Study on Lithofacies Palaeogeography during Permian Emeishan basalt explosion in Guizhou Province, China[J]. JOURNAL OF PALAEOGEOGRAPHY, 2003, 5(1): 17-28.
. Study on Lithofacies Palaeogeography during Permian Emeishan basalt explosion in Guizhou Province, China[J]. JOPC, 2003, 5(1): 17-28.