This paper is the result of geological survey engineering.[Objective]The sedimentary period of the Qiaotou Formation in Liaoning is still not accurately determined,which leads to controversial discussions about its depositional background,especially the palaeoclimate.It is of great significance to discuss its depositional background by using petrogeochemical characteristics and other methods.[Methods]We reconstructed the palaeo-weathering climate conditions,palaeo-salinity and palaeo-oxidation-reduction conditions by analysing the elemental ratios of CaO/(CaO+Fe),Sr/Ba,and V/(Ni+V),as well as the parameters of CIA,ICV,and Ceanom from the petrogeochemical data of the sandstones of the Qiaotou Formation.[Results]Most of the CIA values of the sandstone samples from the Qiaotou Formation are located in the warm and humid region,while most of the ICV values are located in the cold and dry region.Most of the CaO/(CaO+Fe)and Sr/Ba values of the samples fall into the medium saline region,and a small amount is in the slightly saline region.V/(Ni+V)and Ceanom values of sandstone samples are in the reduced region,and a small amount is in the oxidised region.[Conclusions]The Qiaotou Formation was not deposited in the Nanhua Period,and its depositional period was generally in an anoxic reducing environment with medium saline water and a warm and humid climate.
关键词
砂岩/地球化学/沉积背景/古气候/古盐度/古氧化—还原条件/桥头组/地质调查工程/辽宁
Key words
sandstone/geochemistry/sedimentary background/palaeoclimate/palaeo salinity/palaeooxidation-reduction condition/Qiaotou Formation/geological survey engineering/Liaoning Province
维普
万方数据