Characteristics and Genetic Analysis of Hydrothermal Sediment of Lower Cretaceous in Hari Depression,Yin'e Basin
Chen Zhipeng
Ren Zhanli
Yu Chunyong
Qi Kai
Ren Wenbo
Yang Yan
Ma Qian
Abstract：The Lower Cretaceous of the Hari sag in the Yin'e basin has a unique sedimentary structure and mineral composition. The cause,sedimentary environment and formation pattern of the hydrothermal sediment of Lower Cretaceous in Hari depres-sion,Yin'e basin are discussed in this study,based on its mineralogy,petrology and geochemistry.The Lower Cretaceous in Hari depression with lots of minerals including ganalcites,siderite and dolomite,is rich in Fe,Mn and Ba,characterized by high content of ∑REE,enrichment of LREE,and the negative Eu anomaly.Combined with Fe vs.Mn vs.(Cu+Co+Ni)×10 and Ni vs.Co vs.Zn ternary diagrams,it is proved that the Lower Cretaceous received long-term hydrothermal input during deposition.Analyses of trace elements,carbon and oxygen isotopes indicate the anoxic,closed,salty and lacustrine depositional environment.The formation temperatures of carbonate calculated by oxygen isotopes range from 43.94℃ to 86.08℃.It is con-cluded that complex faulting system provides the access to the lake water infiltrating down and the hydrothermal fluids up-welling.Moreover,convection activities between the hydrothermal fluids and the lake water continually offer heat and mineral elements to the lake.This type of hydrothermal sedimentation is long enduring and wide ranging,controlled by both terrige-nous detrital materials supply and hydrothermal fluid property,which represents a special sedimentary model.
Keywords：lacustrine hydrothermal sedimentgeochemical characteristicsformation temperaturehydrothermal fluid eruptionYin'e basinLower Cretaceouspetroleum geology
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：16( 1941-1956 )