Middle Jurassic Interior-ornamental Ammonites of the Republic of Dagestan

Petrochenkov, D.A.; Baraboshkin, E.Y.

Авторы: Petrochenkov Dmitry A., Baraboshkin Eugene Yu
Журнал: Dagestan State Pedagogical University. Journal. Natural and Exact Sciences
Том: 12
Номер: 2
Год издания: 2018
Первая страница: 94
Последняя страница: 100
DOI: 10.31161/1995-0675-2018-12-2-94-100
Аннотация: Complex mineralogical and gemological study of middle Jurassic ammonites of the Re-public of Dagestan as a new kind of interior and jewelry-ornamental raw materials. Methods. Methods of field study of natural objects are used. A set of laboratory methods for studying middle Jurassic ammonites in-cluded the determination of microhardness, specific gravity, luminescence, mineral and chemical composi-tion. Results. Ammonites of commercial quality are associated with the deposits of the Bayosian and Bathian stages and are located in nodules. Ammonites consist of, weight %: calcite – 73, quartz – 10, plagioclase – 7, potassium feldspar – 3, apatite – 2, kaolinite, illite, amphibole, chlorite, pyrite, hematite – less than 1. Aragonite, which forms the initial ammonite shell, is replaced by calcite and apatite. From the elements- admixture the contents, weight %: Sr – 0,104 and Ba – 0,023. The contents of carcinogenic and radioactive elements are close to background. The decorative and technological characteristics of ammonites have been studied. Conclusion. Middle Jurassic ammonites by decorative and technological characteristics can be used as interior specimens and ornamental material for souvenirs. Keywords: ammonite, Middle Jurassic deposits, interior and
Добавил в систему: Барабошкин Евгений Юрьевич

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Middle Jurassic Interior-ornamental Ammonites of the Republic of Dagestanстатья

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