Geochemistry and depositional environment of the Neoproterozoic Ereen and Dartsagt banded iron formation (BIF) deposits in the Idermeg terrane, eastern Mongolia

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Batchuluun Iderbayar, Sodnom Oyungerel, Yeongmin Kim
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Abstract

This study aims to determine the depositional setting and deposit type of the Ereen deposit in the Bayanjargalan soum of Dundgovi province and the Dartsagt deposit in the Dalanjargalan soum of Dornogovi province, Mongolia. Both deposits are hosted within the sediments of the Neoproterozoic Oortsog Formation. The ore-hosted Oortsog Formation consists of shale with muscovite-sericite-magnetite-quartz and marbled limestone. The former is characterzid by gray to black shaly texture. Major, minor and trace elements composition of 16 ore samples of these two deposits were analyzed by XRF, ICP-MS and ICP-OES. The total iron (TFe) contents of the ore samples from the Ereen deposit range from 28.83 to 51.09 wt% with an average of 41.92 wt% whereas the TFe contents of the Dartsagt deposit from 37.61 to 49.78 wt% with an average of 43.15 wt%. In the Post-Archean Australian Shale (PAAS)-normalized REY diagram, the samples from the Ereen and the Dartsagt deposits show a weakly LREE depleted and HREE weakly enriched trend. Also, in the chondrite-normalized REY diagram, negative Eu anomaly Y-enriched trend are observed. The Eu/Eu*SN values of the Ereen deposit (0.93 to 1.25, average 1.08) and the Dartsagt deposit range from 0.93 to 1.25 (avg. 1.08) and from 1.05 to 1.61 (avg. 1.22), respectively. These trace elements characteristics indicate that these two deposits belong to the Superior-type BIF deposit formed on the passive continental margin and are not likely to be associated with volcanogenic rocks.

蒙古东部伊德梅格伦地层中新新生代伊林和达尔塔格特带状铁矿床(BIF)的地球化学和沉积环境
本研究旨在确定蒙古敦戈维省巴彦贾尔嘎朗苏木的埃林矿床和多尔诺戈维省达兰贾尔嘎朗苏木的达尔塔格特矿床的沉积环境和矿床类型。这两个矿床均赋存于新近新生代奥尔索格地层的沉积物中。蕴藏矿石的 Oortsog 地层由页岩、褐铁矿-绢云母-磁铁矿-石英和大理石花纹石灰岩组成。前者的特征是灰色至黑色的鳞片状纹理。通过 XRF、ICP-MS 和 ICP-OES 分析了这两个矿床 16 个矿石样本的主要元素、次要元素和微量元素成分。埃林矿床矿石样本的总铁(TFe)含量在 28.83 至 51.09 wt%之间,平均为 41.92 wt%,而 Dartsagt 矿床矿石样本的总铁(TFe)含量在 37.61 至 49.78 wt%之间,平均为 43.15 wt%。在后雅典澳大利亚页岩(PAAS)归一化REY图中,Ereen和Dartsagt矿床的样品呈现出LREE弱贫化和HREE弱富集的趋势。此外,在软玉归一化 REY 图中,还观察到负 Eu 异常 Y 富集趋势。埃林矿床的 Eu/Eu*SN 值(0.93 至 1.25,平均 1.08)和 Dartsagt 矿床的 Eu/Eu*SN 值分别为 0.93 至 1.25(平均 1.08)和 1.05 至 1.61(平均 1.22)。这些微量元素特征表明,这两个矿床属于在被动大陆边缘形成的Superior型BIF矿床,不可能与火山岩有关。
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来源期刊
Geosciences Journal
Geosciences Journal 地学-地球科学综合
CiteScore
2.70
自引率
8.30%
发文量
33
审稿时长
6 months
期刊介绍: Geosciences Journal opens a new era for the publication of geoscientific research articles in English, covering geology, geophysics, geochemistry, paleontology, structural geology, mineralogy, petrology, stratigraphy, sedimentology, environmental geology, economic geology, petroleum geology, hydrogeology, remote sensing and planetary geology.
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