Distributions of selenium and related elements in high pyrite and Se-enriched rocks from Ziyang, Central China,Journal of Geochemical Exploration

当前位置： X-MOL 学术 › J. Geochem. Explor. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Distributions of selenium and related elements in high pyrite and Se-enriched rocks from Ziyang, Central China
Journal of Geochemical Exploration ( IF 3.4 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.gexplo.2020.106506
Huan Tian , Shuyun Xie , Emmanuel John M. Carranza , Zhengyu Bao , Hai Zhang , Shitou Wu , Changhua Wei , Zhenzhen Ma

Abstract Pyrite-bearing volcanic tuff and carbonaceous slates of the Lower Cambrian Lujiaping Formation have been considered the source of selenium (Se) in high-Se soils in the area of the Naore Village of the Ziyang County, China, where acute Se toxicity occurred in the 1980s. For geochemical exploration, the accumulation and distribution of Se and trace elements within the pyrite grains are of great indicative significance for understanding the possible origin and forming mechanism of the Se enrichment. In this work, 7 rock samples and 89 pyrite grains were collected and analysed to investigate the element micro-distribution within the pyrite grains using EPMA and LA-ICP-MS. The whole-rock analysis shows that the pyrite-bearing Lower Cambrian rocks in Ziyang are commonly enriched in Se, As, Mo, Cd, Cr, Ni, Sb, Cu and Ba. In situ microanalysis indicates that Se (30–1880 μg/g) and As (160–2960 μg/g) concentrations within the pyrite grains are 1–2 orders of magnitude higher than those in the host rocks (Se: 0.56–73.1 μg/g, As: 2.56–195 μg/g) and that the Se contents are negatively correlated with pyrite mineral sizes. Grain-scale element mappings of fresh Se-enriched pyrites reveal two types of Se and As distribution patterns (type-I: high-Se 120–1870 μg/g and low-As

更新日期：2020-05-01

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11