The Pingxiang-Leping depression is one of the important tectonic belts in the west part of Jiangxi Province. The Early Permian siliceous carbonate formation consists of carbonates, clays and siliceous rocks. It is dis...The Pingxiang-Leping depression is one of the important tectonic belts in the west part of Jiangxi Province. The Early Permian siliceous carbonate formation consists of carbonates, clays and siliceous rocks. It is distinguished in the sedimentary features and the peculiar Chrysanthemum-shaped celestite. The discovery of this celestite is helpful for resuming the sedimentary environment of west Jiangxi Province. Therefore, the Chrysanthemum shaped celestite has been studied systematically both in the field and in laboratories.展开更多
Combined with sedimentary observation and mineralogical research on a type of drusy celestite of early diagenesis in origin, this geochemical study on the Qixia Formation at the Shuibuya Section, Badong County, Hubei ...Combined with sedimentary observation and mineralogical research on a type of drusy celestite of early diagenesis in origin, this geochemical study on the Qixia Formation at the Shuibuya Section, Badong County, Hubei Province of south China evaluates the contribution of sedimentation and diagenesis to the mass fractions of CaO, Al 2O 3, MgO, SiO 2, Fe 2O 3, Na 2O, K 2O, Mn, Sr, P and Ba in the carbonates. The Sr, initially released from the stabilization of carbonate calcium mineral, precipitated with sulfate ion as celestite in early diagenetic environment, where sulfate reduction was the minimum. Then it redistributed in burial diagenetic environment, where celestite was replaced by calcite. The fractions of the MgO and SiO 2 in the carbonates were mainly modified by the early dolomitization and silicification respectively. That of the Na 2O was overprinted by the burial diagenesis. Multivariate statistical analysis on data of sixty bulk rocks indicates that the mass fractions of the Al 2O 3, K 2O, Fe 2O 3, Mn, CaO, P and Ba were affiliated with the sedimentary factor despite the obvious decrease of CaO during early dolomitization and silicification. Among them, the Al 2O 3 and K 2O mainly represent the detrital components. In addition, a dysaerobic sedimentary background was confirmed by trace element measurement and information derived from the formation of the celestite. This genetic discrimination facilitates the interpretation of the transgressive regressive (T R) cycle and specialities featured this unusual carbonate unit.展开更多
基金Project supported by the National Natural Science Foundation of China.
文摘The Pingxiang-Leping depression is one of the important tectonic belts in the west part of Jiangxi Province. The Early Permian siliceous carbonate formation consists of carbonates, clays and siliceous rocks. It is distinguished in the sedimentary features and the peculiar Chrysanthemum-shaped celestite. The discovery of this celestite is helpful for resuming the sedimentary environment of west Jiangxi Province. Therefore, the Chrysanthemum shaped celestite has been studied systematically both in the field and in laboratories.
文摘Combined with sedimentary observation and mineralogical research on a type of drusy celestite of early diagenesis in origin, this geochemical study on the Qixia Formation at the Shuibuya Section, Badong County, Hubei Province of south China evaluates the contribution of sedimentation and diagenesis to the mass fractions of CaO, Al 2O 3, MgO, SiO 2, Fe 2O 3, Na 2O, K 2O, Mn, Sr, P and Ba in the carbonates. The Sr, initially released from the stabilization of carbonate calcium mineral, precipitated with sulfate ion as celestite in early diagenetic environment, where sulfate reduction was the minimum. Then it redistributed in burial diagenetic environment, where celestite was replaced by calcite. The fractions of the MgO and SiO 2 in the carbonates were mainly modified by the early dolomitization and silicification respectively. That of the Na 2O was overprinted by the burial diagenesis. Multivariate statistical analysis on data of sixty bulk rocks indicates that the mass fractions of the Al 2O 3, K 2O, Fe 2O 3, Mn, CaO, P and Ba were affiliated with the sedimentary factor despite the obvious decrease of CaO during early dolomitization and silicification. Among them, the Al 2O 3 and K 2O mainly represent the detrital components. In addition, a dysaerobic sedimentary background was confirmed by trace element measurement and information derived from the formation of the celestite. This genetic discrimination facilitates the interpretation of the transgressive regressive (T R) cycle and specialities featured this unusual carbonate unit.
