A Synthetic Thought Of Provenance Analysis In The Terrigenous Clastic Rock Basin

This article has done some provenance analyses of the Lower Permian Shanxi Formation in northern Ordos Basin, obtains its synthetic information of provenance, and put forward a classification scheme, a synthetic thought, a systematic method of provenance analysis in the terrigenous clastic rock basin.Provenance analysis methods are divided into orogenic belt and basin analyses. The orogenic belt analyses are divided into reverse profile analyses and parent rocks analyses. The basin analyses are divided into sedimentological, geochemical and geophysical analyses.Then the sedimentological analyses are divided into sandstone fragment components, heavy minerals, rock debris, paleocurrent direction, profile sequence structure, conglomerate components, sand body dispersion system, clastic grain structure and cathodoluminescence analyses. The geochemical analyses are divided into major elements, trace elements, rare earth elements and isotope analyses. The geophysical analyses are divided into bouguer gravity anomaly and seism and well logging analyses.The synthetic thought of provenance analysis in the terrigenous clastic rock basin includes univariate and multivariate analysis thought.There is a suggested method and work flow. Firstly, the reverse profile problems have to be solved. Secondly, the studies should be divided into defining the rough provenance direction and subarea, estimating tectonic setting, analyzing parent rocks and dating rocks and stratums of orogenic belt and basin to carry out. Thirdly, using univariate and multivariate analysis of sedimentology, geochemistry and geophysics contrast the conclusions of the before step.Finally, the result map of synthetic information of provenance should be drawn.Based on the synthetic thought of provenance analysis of terrigenous clastic rock basin, there are some conclusions of univariate provenance analyses and a result map of synthetic information of provenance of the Lower Permian Shanxi Formation in northern Ordos Basin.The result map shows three subareas in Shanxi Stage in northern Ordos Basin.The provenance of west subarea is the ancient metamorphic series of the Archean and Proterozoic in the Alxa areas and the west section of Yinshan orogenic belt, which is specifically in the Alxa League and Langshan mountain nowadays. The provenance of middle subarea is the ancient metamorphic series of the Archean and Proterozoic in the middle-west section of Yinshan orogenic belt, which is specifically in the Seertengshan mountain and Daqingshan mountain nowadays, and is also influenced by the provenance of east subarea. The provenance of east subarea is the ancient metamorphic series of the Archean and Proterozoic in the middle section of Yinshan orogenic belt and volcanic rocks of the Upper Paleozoic in the Sonid Right Banner-Linxi tectonic belt, which is specifically in the Daqingshan mountain and Sonid Right Banner-Linxi areas nowadays.The synthetic thought and method of provenance analysis of terrigenous clastic rock basin are successed in the Lower Permian Shanxi Formation, northern Ordos Basin, which not only shows their correctness and practicability, but also is good for the improvement of provenance analysis, the study of sedimentary basin in Ordos Basin and the same study of provenance analysis in the other terrigenous clastic rock basins.