Comparison of Geochemical and Mineralogical Characteristics of Palaeogene Oil Shales and Coals from the Huangxian Basin, Shandong Province, East China
Comparison of Geochemical and Mineralogical Characteristics of Palaeogene Oil Shales and Coals from the Huangxian Basin, Shandong Province, East China
复制标题
山东省黄县盆地古近系油页岩和煤地球化学和矿物学特征比较
DOI：
10.3390/min10060496
复制
发表时间：
2020-05
期刊：
影响因子：
2.5
通讯作者：
Zuozhen Han
中科院分区：
文献类型：
--
作者：
Xue Zheng;Baruch Spiro;Zuozhen Han
煤和油页岩都是富含有机质的沉积岩。但它们的有机质来源和沉积环境不同。本研究以山东黄县盆地古近系李家崖组层序为研究对象，该层序具有海相地球化学指示的油页岩上覆有海相回归指示的煤系。研究C1煤层与下伏OS2油页岩层，对比其地球化学和矿物学特征，厘清其组成细节，以期在盆地地质演化背景下阐明其物源特征、沉积环境特征及沉积后过程。C1煤和OS2油页岩的Al2O3/TiO2比值（18.1 ~ 64.9）和TiO2/Zr比值（28.2 ~ 66.5）表明其为长硅质-中间物源，黄县断裂南缘中生代花岗岩可能是其物源之一。低硫含量（0.53 ~ 0.59%）和低Sr/Ba比值（0.32 ~ 0.67）表明C1煤为淡水沉积环境。总硫含量较高（0.60 ~ 1.44%），Sr/Ba比值较高（0.31 ~ 1.11%），且含钙质壳，说明油页岩沉积过程中有海水侵入。OS2油页岩的V/Ni、V/(V + Ni)和V/Cr比值显示出氧-亚氧条件，且OS2煤层上下古氧化还原变化明显。C1煤中硼的高含量（平均504 ppm）与铝矾的高含量（相关系数为0.96）有关，硼的高含量与热液的二次富集有关。煤脉中自形自生钠长石与安钙石、石英伴生，表明钠长石是火山成因的安钙石与二氧化硅反应的产物。反应发生在190°C左右，表明该地区受到热液流体的影响。
Coal and oil shale are both organic matter-rich sedimentary rocks. However, their sources of organic matter and their depositional environments are different. The present study focuses on the Palaeogene Lijiaya Formation sequence in the Huangxian Basin, Shandong Province, East China, which has oil shales showing marine geochemical indicators overlain by coals indicating marine regression. We investigated the C1 coal seam and underlying OS2 oil shale layers, compared their geochemical and mineralogical characteristics, clarified the details of their constituents, in order to elucidate the features of their sources, their depositional environments, and the post depositional processes in the context of the geological evolution of the basin. The Al2O3/TiO2 (18.1–64.9) and TiO2/Zr ratios (28.2–66.5) in the C1 coals and OS2 oil shales, respectively, suggest a felsic to intermediate source, and the Mesozoic granite on the South of Huangxian Fault may be one of the provenances of these sediments. The low sulphur content (0.53–0.59%) and low Sr/Ba ratios (0.32–0.67) suggest a freshwater depositional environment for the C1 coals. In contrast, the higher total sulphur contents (0.60–1.44%), the higher Sr/Ba ratios (0.31–1.11%), and the occurrence of calcareous shells, indicate seawater intrusions during deposition of the oil shales. The V/Ni, V/(V + Ni), and V/Cr ratios of the OS2 oil shale suggest oxic to suboxic conditions with a distinct change in palaeo-redox between the lower and upper parts of OS2 seam. The high boron contents in C1 coals (average, 504 ppm) is related to the high content of analcime (with the correlation coefficient of 0.96), and the high concentration of boron was attributed to a secondary enrichment by epigenetic hydrothermal solutions. The occurrence of idiomorphic-authigenic albite in association with analcime and quartz in veins in the coals suggests that albite is a product of a reaction between analcime and silica, both of volcanic origin. The reaction takes place at about 190 °C, indicating that the area was affected by hydrothermal fluids.
登录
查看更多内容
影响因子：
5.6
作者：
Ketris, M. P.;Yudovich, Ya. E.
通讯作者：
Yudovich, Ya. E.
影响因子：
3.5
作者：
B. Spiro;D. Welte;J. Rullkoetter;R. G. Schaefer
通讯作者：
B. Spiro;D. Welte;J. Rullkoetter;R. G. Schaefer
DOI：
10.1201/9780429087820-4
发表时间：
2020-04
期刊：
--
影响因子：
--
作者：
C. Chou
通讯作者：
C. Chou
影响因子：
3.9
作者：
Dai, Shifeng;Wang, Xibo;Zou, Jianhua
通讯作者：
Zou, Jianhua
影响因子：
64.8
作者：
B. Spiro
通讯作者：
B. Spiro