Geological factors for the enrichment of critical elements within the Lopingian (Late Permian) coal-bearing strata in western Guizhou, Southwestern China: Constrained with whole-rock and zircon geochemistry

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS
Tianyang Yang , Yulin Shen , Lu Lu , Jun Jin , Wen Huang , Fayue Li , Yunfei Zhang , Jiangchen Hu , Lijun Zeng
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Abstract

A number of volcanic ash-bearing layers deposited in the Upper Permian coal-bearing strata on the southwestern margin of the Yangtze Craton are well preserved, and some layers show the enrichment of critical elements such as an assemblage of Zr(Hf)–Nb(Ta)–Ga–REE (REE, rare earth elements). Based on previous work, we studied the source of the Upper Permian volcanic ash-bearing layers widely distributed in western to northwestern Guizhou and the geological factors for the enrichment of critical elements. This article provides a detailed analysis of the mineralogical and geochemical characteristics of the Upper Permian volcanic ash-bearing layers. The mineralogy of the samples is dominated by clay minerals, quartz, anatase, plagioclase, and pyrite, with a few containing K-feldspar, calcite, dolomite, and siderite. The clay minerals are mainly composed of mixed-layer illite/smectite (I/S) and kaolinite. The whole rock geochemistry (Al2O3/TiO2, Nb/Ta vs. Zr/Hf, Nb/Al2O3 vs. Zr/Al2O3, and Th/Al2O3 vs. Zr/Al2O3) and zircon trace elements (Th/Nb vs. Hf/Th, Nb/Yb vs. U/Yb, Ta vs. Nb, and Yb/Sm vs. Y) were used to help determine the source. The results indicate that the sources of the samples include Emeishan high-Ti basalt, intraplate volcanic ash from the Emeishan large igneous province (ELIP), and arc volcanic ash. The critical elements (Zr[Hf]–Nb[Ta]–REE) are mainly derived from the syndepositional intraplate volcanic ash erupted from the ELIP. The results of zircon trace elements and Hf isotope ratios suggest that the magma from the ELIP has gradually evolved from the mantle to the crust, and became more enriched in critical elements such as Nb and Ta. The intraplate volcanic ash from ELIP is the main supplier of critical elements and plays a crucial role in their enrichment through the Late Permian in southwestern China. The paleoenvironment controlled the deposition of volcanic ashes, and most of the critical element enrichment layers developed in weak hydrodynamic environments. The paleogeography and acid rain influenced the migration of critical elements such as Nb, Ta, REE, and Y in some layers. The enrichment of critical elements is also controlled by the regularity and intensity of intraplate volcanic activity.

Abstract Image

Abstract Image

中国西南贵州西部罗平(晚二叠世)含煤地层中关键元素富集的地质因素:以全岩石和锆石地球化学为约束
长江克拉通西南缘上二叠统含煤地层中沉积了一批保存较好的火山灰质地层,部分地层出现了Zr(Hf)-Nb(Ta)-Ga-REE(REE,稀土元素)组合等关键元素富集现象。在前人工作的基础上,我们研究了广泛分布于贵州西部至西北部的上二叠统火山灰质地层的来源及关键元素富集的地质因素。本文详细分析了上二叠统火山灰质地层的矿物学和地球化学特征。样品的矿物学特征以粘土矿物、石英、锐钛矿、斜长石和黄铁矿为主,少数含有钾长石、方解石、白云石和菱铁矿。粘土矿物主要由混层伊利石/直闪石(I/S)和高岭石组成。全岩地球化学(Al2O3/TiO2、Nb/Ta vs. Zr/Hf、Nb/Al2O3 vs. Zr/Al2O3、Th/Al2O3 vs. Zr/Al2O3)和锆石痕量元素(Th/Nb vs. Hf/Th、Nb/Yb vs. U/Yb 、Ta vs. Nb、Yb/Sm vs. Y)被用来帮助确定来源。结果表明,样品的来源包括峨眉山高钛玄武岩、峨眉山大火成岩带板内火山灰和弧形火山灰。关键元素(Zr[Hf]-Nb[Ta]-REE)主要来源于峨眉山大火成岩省喷发的板内火山灰。锆石痕量元素和Hf同位素比值的结果表明,ELIP岩浆从地幔逐渐演化到地壳,Nb和Ta等关键元素变得更加富集。ELIP的板内火山灰是关键元素的主要供应者,对中国西南地区晚二叠世关键元素的富集起了关键作用。古环境控制了火山灰的沉积,大部分关键元素富集层发育在弱水动力环境中。古地理环境和酸雨影响了一些地层中 Nb、Ta、REE 和 Y 等关键元素的迁移。板内火山活动的规律性和强度也控制着临界元素的富集。
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来源期刊
International Journal of Coal Geology
International Journal of Coal Geology 工程技术-地球科学综合
CiteScore
11.00
自引率
14.30%
发文量
145
审稿时长
38 days
期刊介绍: The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.
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