Mineral Elemental Response to the evolution of Terrestrial Brine Faulted-basin
Chen Zhonghong, et al
Sedimentology ,2008,26(6):925-932
In order to investigate the relation between the distribution of mineral elementals and sedimentary environment including the salinity and depth of water body, and the evolution of lake-basin, emission spectrograph of inductive coupling plasma was used to intensively testing and dissection the content of mineral elements in the deep death of the Paleogene from the Well Haoke-1 in Dongying sag. The involved formation contained the Member 3, Member 4 of Shahejie Formation and Kongdian Formation, in which the main source rocks distributed. The results demonstrate that: in the oxidized sedimentary environment of shallow shore-lacustrine the content of Sr, Ca and the parameters of Ca/Mg, Sr/Ba, Sr/Ca have low value response, the content of Fe, Al, Ba, V and the parameter of (Fe+Al)/(Ca+Mg) have high value response; in the brine-lake sedimentary environment the content of Mn, Ba,V and the parameters of V/Ni, (Fe+Al)/(Ca+Mg) have low value response, the content of Sr, Na and the parameters of Sr/Ba, Fe/Mn, Sr/Ca have high value response; in the reductive brackish sedimentary environment of half-deep lacustrine lake the content of K, Na, Fe and the parameters of Fe/Mn have low value response, the content of Ca, Mn have high value response. In the co-sedimentary environment of saline deposit and mud of the middle part of Sha-4 Formation, the distribution of mineral elements has obvious characteristics of discretion and fluctuation. Sr/Ba, Sr/Ca have obvious high value response in the saline lake and are verified to be good parameters for salinity of water-body. The parameters of Fe/Mn and (Fe+Al)/(Ca+Mg) are approved to be good parameters for the depth of water-body and their value increased with deepening of water-body. The parameters above-mentioned should be applied and synthetically analyzed to determining characteristics of geological factors for the parameters were influenced by many geological factors including sedimentary environment and lithologic character.
Key words: response of mineral element, ration of mineral element, evolution of basin, brine lake, Dongying sag