Mineral Composition and Stratigraphic Position of Interior Jewelry Ammonites from the Middle Aptian of the Republic of North Ossetia-Alania

IF 0.3 Q4 GEOLOGY
E. Yu. Baraboshkin, D. A. Petrochenkov
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引用次数: 0

Abstract

The stratigraphic position and mineral composition of ammonite shells of interior and jewelry quality from the Republic of North Ossetia-Alania have been studied for the first time. Ammonites were collected from the middle reaches of the Urukh River and originated from middle Aptian sediments accumulated in anoxic environments. The set of ammonite studies included determination of microhardness, density, luminescence; optical–petrographic analysis; quantitative determination of chemical and mineral composition; and electron probe studies. Ammonites consist mainly of calcite, pyrite, and aragonite. The walls and septa of the shells retained the original aragonite composition. The residential and destroyed hydrostatic chambers of the shells are composed of marl. Micron inclusions of ankerite and apatite have been found from accessory minerals. Sr and Ni have been identified as impurities. The mineralization of the shells began with the formation of pyrite layers. The mineral composition of the ammonites is calcite–pyrite.

Abstract Image

北奥塞梯-阿拉尼亚共和国中古生代内部珠宝鲑鱼的矿物成分和地层位置
摘要:首次研究了北奥塞梯-阿拉尼亚共和国出土的室内和珠宝级氨甲贝壳的地层位置和矿物成分。氨石采集自乌鲁克河中游,来自缺氧环境中积累的中奥普斯沉积物。对鲑鱼的一系列研究包括测定显微硬度、密度、发光;光学摄谱分析;定量测定化学和矿物成分;以及电子探针研究。芒硝主要由方解石、黄铁矿和文石组成。贝壳的壁和隔板保留了原来的文石成分。贝壳的居住区和被破坏的静水腔由泥灰岩组成。从附属矿物中发现了微米级的角闪石和磷灰石包裹体。锰和镍已被确定为杂质。贝壳的矿化始于黄铁矿层的形成。褐铁矿的矿物成分为方解石-黄铁矿。
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来源期刊
CiteScore
0.60
自引率
25.00%
发文量
43
期刊介绍: Moscow University Geology Bulletin  is the journal that mainly publishes scientific articles, short reports of graduate students, and reviews. Publications made by the members of the Faculty of Geology of the Moscow State University and their collaborators are published. Publications encompass all branches of geology.
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