Features of Chromite-Containing Placers in the Lukoyanov Placer District (Nizhny Novgorod Region) and Their Formation Conditions

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS
A. V. Lalomov, A. V. Grigorieva, Y. N. Ivanova
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Abstract

Chromites are a common component of the heavy fraction of sedimentary cover deposits in the platform areas, and their contents usually do not exceed some percents. Commonly, economic chromite placers are formed in vicinity of bedrock sources. Within the Lukoyanov placer district (Nizhny Novgorod region), high chromite contents (up to 100 kg/m3) were found in Middle Jurassic complex coastal-marine rare metal–titanium placers of economic importance. Placer bodies are localized on the periphery of domes in the sedimentary cover. The placers can be sourced from Upper Permian and Lower Jurassic rocks, which were eroded in the zone of positive tectonic structures of the cover and platform basement and within the adjacent land. The revealed patterns can serve as a basis for forecasting similar deposits within promising areas.

Abstract Image

卢科扬诺夫矿床区(下诺夫哥罗德州)含铬矿床的特征及其形成条件
铬铁矿是地台地区沉积覆盖层沉积物中常见的重金属成分,其含量通常不超过百分之几。经济铬矿通常形成于基岩源附近。在卢科亚诺夫块矿区(下诺夫哥罗德州),具有重要经济价值的中侏罗世复合滨海稀有金属钛块矿中发现了高含量铬铁矿(高达 100 公斤/立方米)。矿体位于沉积覆盖层中圆顶的外围。这些矿床可能来自上二叠统和下侏罗统岩石,这些岩石在覆盖层和平台基底的正构造带以及邻近陆地内受到侵蚀。所揭示的模式可作为预测有前景地区类似矿床的依据。
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来源期刊
Lithology and Mineral Resources
Lithology and Mineral Resources 地学-地球化学与地球物理
CiteScore
1.30
自引率
37.50%
发文量
29
审稿时长
>12 weeks
期刊介绍: Lithology and Mineral Resources is an international peer reviewed journal that publishes articles on a wide range of problems related to the formation of sedimentary rocks and ores. Special attention is given to comparison of ancient sedimentary rock and ore formation with present-day processes. The major part of the journal is devoted to comparative analysis of sedimentary processes on the continents and in oceans, as well as the genetic aspects of the formation of sedimentary and hydrothermal–sedimentary mineral resources. The journal welcomes manuscripts from all countries in the English or Russian language.
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