GEOCHEMICAL CHARACTERISTICS OF PALEOKARSTIFICATION OF ORDOVICIAN-MAJIAGOU CARBONATES IN XINGXIAN AND LIULIN, SHANXI, CHINA

The Fifth Member of the Ordovician Majiagou Formation in Xingxian and Liulin, Shanxi Province consists of carbonates and evaporates that dep osited in low-energy, restricted saline environments of an epicontinen tal-sea. After deposition, these carbonates and evaporites underwent a long-period of exposure and karstification until Carboniferous region al submerging occurred. Twenty six elements were analyzed with the Maj iagou carbonate rock samples. The data from 176 samples collected from the two locations indicate 1) the sedimentation has largely controlle d the CaO/MgO and the higher contents of Ba, Na2O, and B; 2) the paleo karstification has resulted in a concentration of Al2O3, Fe2O3, P, V, Ti, and La and output of Ba and Sr; and 3) the sedimentation and buria l diagenesis has governed the Fe2+ and Mn2+ distribution.