Analysis of genetic model of siliceous rocks of the Middle Jurassic Jiulongshan Formation in Ming Tombs area in Beijing and their geological significance
Li Kun-Peng, Xing Chao-Chao, Shen Bing
School of Earth and Space Sciences,Peking University,Beijing 100871,China
Abstract：The terrestrial sedimentary strata developed in northern China during the Late Mesozoic. The Middle Jurassic Jiulongshan Formation is a typical representative of this period. A set of siliceous rocks emerged from the Jiulongshan Formation in the Changping Tombs area. The Ge/Si value of the siliceous rocks is about 3-4 μmol/mol, between the hydrothermal fluid(~11 μmol/mol) and the river(~0.7 μmol/mol), except for a few samples with high values. The REE distribution has obvious positive Eu anomalies(1.2~2.4,with an average of 1.58),and is relatively stable overall,without obvious Ce anomalies. It has both the characteristics of rivers and hydrothermal fluids. Through semi-quantitative analysis of REE characteristics and Ge/Si value,we believe that the source of siliceous rocks in the Jiulongshan Formation came from a mixture of hydrothermal fluids and rivers,of which the hydrothermal contribution is about 30%.
Li Kun-Peng,Xing Chao-Chao,Shen Bing. Analysis of genetic model of siliceous rocks of the Middle Jurassic Jiulongshan Formation in Ming Tombs area in Beijing and their geological significance[J]. JOPC, 2021, 23(5): 1010-1019.
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