Abstract
The characteristics of sedimentary petrology are significant in determining geological provenance. By using field outcrop observation and indoor identification of thin sections, the characteristics of Jurassic system Tuchengzi Formation clastic rocks exposed in the Beijing Yanqing “flowerpot” basin, which include rock types, clastic composition and cement type, etc. have been analyzed systematically to identify the provenance direction and tectonic setting and nature of the provenance. Research shows that the sedimentary rocks in this area belong to analluvial fan and braided river sedimentary rock system and include mainly conglomerates, lithic sandstone, and feldspathic lithic sandstone. The main compositions of the conglomerate are dolomite and limestone. Nearly 50% to 70% of the sandstones are mainly polycrystalline quartz; 10% to 15% are feldspar; and 40% to 55% are composed of debris from mainly magmatic and metamorphic rocks. A Dickinson triangular diagram indicates that the provenance type in this area is recycled orogny evolving from clastic recycled orogeny such as a collisional orogenic belt to a transitional recycled orogeny. On the basis of the geographic position and tectonic setting, three types of provenance can be identified in the Jurassic system Tuchengzi Formation. The far source provenances are Archean erathem basement metamorphic rocks in the northern basin and granite or adamellite that intruded rocks of the Late Jurassic epoch of the Yanshanian period in the northeast. The nearby provenance is the Mesoproterozoic erathem Changchengian system and Jixianianian system dolomite in both the east and west.
Highlights
Provenance analysis is an effective method for discriminating the types of the sedimentary mother rock, restoring the sedimentary environment, and determining the geographic location of the mother rock district
Two sets of provenance analysis diagrams of detrital composition, which were developed by Dickinson and Suczek [2] and Dickinson [3], were used to systematically analyze the contents of quartz, feldspar, and lithoclasts in the sandstone samples obtained from the Jurassic Tuchengzi Formation in the study area
The characteristic components of the Jurassic Tuchengzi Formation clastic rocks exposed in the Beijing Yanqing Flowerpot Basin were analyzed in this study
Summary
Provenance analysis is an effective method for discriminating the types of the sedimentary mother rock, restoring the sedimentary environment, and determining the geographic location of the mother rock district. A method that uses sandstone composition to determine the tectonic nature of the provenance area is widely used in basin analysis and in discussions of basin type and evolution [1]. For the 10 years, these models have undergone little improvement; Ingersoll et al [3] developed the Gazzi-Dickinson method of microscopic statistics This method, which is used to discuss basin type and evolution, is more accurate in basin analysis than the former method and is used widely. Such research helps to determine the path and distance of sediment transport and the provenance
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