N. I. Ponomareva, V. V. Gordienko, N. O. Melyantsov
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引用次数: 0
Abstract
Study data on dark-colored, bright, and pale pink tourmalines of rare-metal pegmatites from Mt. Okhmylk in the Voron’ya Tundra region are reported. Chemical compositions and parameters of elementary cells are determined for tourmalines. Dark-colored tourmaline I is schörl–olenite, and pink tourmaline corresponds to elbaite–olenite. Studied tourmalines and tourmalines from spodumene pegmatites of other regions are compared. Based on the rare-earth element distribution in tourmalines, they are suggested to have been formed with involvement of high-temperature postmagmatic solutions. Mineral inclusions in schörl–olenite are represented by biotite and magnetite. Mineral inclusions in elbaite–olenite are cassiterite, pollucite, apatite, and tantalite. Tantalite is characterized by higher tantalum and low niobium. In addition, pure manganotantalite is often present in elbaite–olenite, and simpsonite is always observed at contacts between tantalite inclusions and tourmaline. All these data are indicative that albite–spodumene pegmatites of this region were formed with an active role of metasomatic processes.
摘要报告了沃龙亚苔原地区奥赫米尔克山稀有金属伟晶岩中深色、明亮和淡粉色电气石的研究数据。报告确定了碧玺的化学成分和基本单元参数。深色電氣石 I 是雪橄橄欖石，而粉紅色電氣石則是埃爾白橄欖石。研究中的电气石和来自其他地区磷灰石伟晶岩的电气石进行了比较。根据电气石中稀土元素的分布，认为它们是在高温后熔岩溶液的参与下形成的。辉绿岩中的矿物包裹体以生物铁和磁铁矿为代表。埃尔白橄榄石中的矿物包裹体有锡石、辉石、磷灰石和钽铁矿。钽铁矿的特点是钽含量较高而铌含量较低。此外，在埃尔白橄榄石中经常出现纯锰钽铁矿，在钽铁矿包裹体与电气石的接触处总是能观察到矽卡岩。所有这些数据都表明，该地区的白云石-黝帘石伟晶岩是在元成岩过程中形成的。
期刊介绍：
Geology of Ore Deposits is a periodical covering the topic of metallic and nonmetallic mineral deposits, their formation conditions, and spatial and temporal distribution. The journal publishes original scientific articles and reviews on a wide range of problems in theoretical and applied geology. The journal focuses on the following problems: deep geological structure and geodynamic environment of ore formation; distribution pattern of metallogenic zones and mineral deposits; geology and formation environment of large and unique metallic and nonmetallic deposits; mineralogy of metallic and nonmetallic deposits; physicochemical and isotopic characteristics and geochemical environment of ore deposition; evolution of ore-forming systems; radiogeology and radioecology, economic problems in exploring, developing, and mining of ore commodities.
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