| Application of Glauconite Sedimentary Geochronology |
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| 作者姓名： | 于荣炳 |
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| 摘 要： | Glauconite is widely distributed in space and time.In China glauconite-bearing strata are extensive occurrence ranging from Late Cretaceous to Middle Proterozoic in age.X-ray powder analysis,X-ray diffracition analysis and differential thermal analysis revealed that glauconite has a mica-type structure between dioctahedron and trioctahedron.Its chemical composition is:Al2O310.6%,SiO249.23%,MgO3.24%,Fe2O317.40%,FeO1.8%,and K2O7.92%,Its crystal form and thermal properties are very similar to those of mica-like clay minerls.According to isotopic age determinations of glauconite in modern oceans (including the East China Sea,the South China Sea and the Yellow Sea),we consider that in the extreme case glauconite is an authigenic mineral.It is generally formed in sedimentary rocks.Is has further proved that glauconite can be used to determine the ages of sedimentary rocks.
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| 关 键 词： | 海绿石 地质年代学 沉积环境 晚白垩纪 原生代 结晶化学 矿物学 |
Application of glauconite in sedimentary geochronology |
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| Rongbing,Yu.Application of Glauconite Sedimentary Geochronology[J].Chinese Journal of Geochemistry,1989,8(3):283-291. |
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| Authors: | Rongbing Yu |
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| Institution: | (1) Tianjin Institute of Geology and Mineral Resources, China |
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| Abstract: | Glauconite is widely distributed in space and time. In China glauconite —bearing strata are of extensive occurrence ranging
from Late Cretaceous to Middle Proterozoic in age. X-ray powder analysis, X-ray diffraction analysis and differential thermal
analysis revealed that glauconite has a mica —type structure between dioctahedron and trioctahedron. Its chemical composition
is: Al2O3 10.67%, SiO2 49.23%, MgO 3.24%, Fe2O3 17.40%, FeO 1.8%, and K2O 7.92%. Its crystal form and thermal properties are very similar to those of mica—like clay minerals. According to isotopic
age determinations of glauconite in modern oceans (including the East China Sea, the South China Sea and the Yellow Sea),
we consider that in the extreme case glauconite is an authigenic mineral. It is generally formed in sedimentary rocks. It
has further proved that glauconite can be used to determine the ages of sedimentary rocks. |
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