贵州惠水早石炭世打屋坝组黑色岩系稀土元素地球化学特征及沉积环境分析

发布时间：2018-02-27 15:11

本文关键词： 黔南惠水打屋坝组黑色岩系稀土元素沉积环境　出处：《中国稀土学报》2017年05期 　论文类型：期刊论文

【摘要】：为深入探讨贵州黔南地区早石炭世打屋坝组黑色岩系的沉积环境与物源分析,笔者选取了贵州惠水王佑地区早石炭世打屋坝组黑色岩系进行系统采样和稀土元素地球化学分析,探讨该区域黑色岩系的沉积环境变化特征,为下一步页岩气勘探提供参考。分析结果表明,研究区域的稀土元素总量ΣREE为(100.52~627.32)×10~(-6),平均值为191.20×10~(-6),比北美页岩稀土总量(200.21×10~(-6))略低。通过LREE/HREE,δCe,δEu等相关参数显示,研究区域的黑色岩系经北美页岩标准化后曲线呈平坦状,表现为轻稀土富集,重稀土相对亏损;研究区域样品的δEu值为0.86~1.11,平均值为0.97,δCe值为0.92~1.12,平均值为1.03,异常表现不明显,结合野外岩性特征变化,可推断研究区域的沉积环境表现为弱氧化-弱还原环境,属于台地边缘斜坡-浅海陆棚相;通过w(ΣREE)-w(La)/w(Yb)图解可知,研究区域的物源属于上地壳花岗岩与沉积岩的混合物;此外,结合研究区域样品的TOC含量与黄铁矿的富集程度可知,贵州惠水王佑地区早石炭世打屋坝组黑色岩系具有良好的生烃潜力。
[Abstract]:The analysis for the in-depth study of the Early Carboniferous in Guizhou area of Qiannan called Wu Ba black rock series of sedimentary environment and provenance, the author selected the Early Carboniferous Guizhou Huishui area called Wang You Wu Ba group of black rock series analysis system sampling and geochemistry of rare earth elements, the region of the black rock series characteristic changes of sedimentary environment, to provide reference for the next step of shale gas exploration. The analysis results show that the study area of the total amount of rare earth elements (100.52~627.32) for sigma REE * 10~ (-6), 191.20 * 10~ (-6), the average ratio of North American shale rare earths (200.21 * 10~ (-6)) is slightly lower. By LREE/HREE, Delta Ce. Eu display and other related parameters, the black rock series in the study area by the shale normalized curve flat, showed LREE enrichment, hree depletion; Delta Eu research area of the sample value is 0.86~1.11, the average value is 0.97, Ce value is 0.92~1.12, the average value is 1.03, The abnormal performance is not obvious, with lithological characteristics, sedimentary environment of the study area can be inferred reduction environment for weak oxidation weak, which belongs to the platform edge slope shallow shelf facies; through the w (sigma REE) -w (La) /w (Yb) graphic shows that the study area belongs to the mixture of the source of granite and upper crust sedimentary rocks; in addition, combined with the content of TOC in study area samples and pyrite enrichment of the Early Carboniferous Guizhou Huishui area called Wu Ba Wang You group black rock series has good potential of hydrocarbon generation.

【作者单位】：贵州大学资源与环境工程学院;
【基金】：中国地质调查局页岩气调查项目(DD20160182-05) 贵州省重点学科地质资源与地质工程建设项目(黔学位合字ZDXK[2015]20)资助
【分类号】：P585;P618.13

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