Abstract

New data were used to analyze the distribution of polycyclic aromatic hydrocarbons (PAH) in the lithological complex and soils of the Siljan impact crater area (Scandinavian Shield, central Sweden). Ten individual unsubstituted PAHs were identified, including diphenyl, fluorene, phenanthrene, anthracene, pyrene, chrysene, fluoranthene, benzo[a]anthracene, benzo[a]pyrene, benzo[ghi]perylene, as well as a number of substituted naphthalene homologs. The PAHs were analyzed using the Shpolsky spectroscopy. The studies were carried out at the crater edge (an annular morphostructural depression) and in the adjacent areas. The depression is characterized by traces of hydrothermal activity and modern oil and gas seepages. In the gas seepage area at depths of 267‒485 m, nine out of eleven studied PAHs were identified (concentration from 20 to 890 μg/kg in total) in the igneous rock complex. Sedimentary rocks at depths from 10 to 250 m contain only naphthalene homologs, phenanthrene, and pyrene. The PAH concentration in sedimentary rocks in the oil seepage area is two times higher than in the gas seepage area, and its composition (naphthalene homologs, phenanthrene, pyrene, diphenyl, chrysene) is close to the PAH composition in oil. In general, soils of the crater show a hydrocarbon dispersal halo, which is presumably caused by the oil and gas seepages and traces of hydrothermal activity. Characteristics of this halo are differentiated in space and make it possible to predict hydrocarbon seepages in unexplored areas.

中文翻译：

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瑞典Siljan撞击坑的岩石和土壤中的多环芳烃

摘要

新的数据用于分析Siljan撞击坑地区（瑞典中部斯堪的纳维亚盾）的岩性复合体和土壤中多环芳烃（PAH）的分布。确定了十种未取代的PAH，包括联苯，芴，菲，蒽，pyr 、,、荧蒽，苯并[ a ]蒽，苯并[ a ] py，苯并[ ghi]per，以及许多取代的萘​​同系物。使用Shpolsky光谱仪分析了PAH。研究是在火山口边缘（环形形态构造凹陷）和邻近区域进行的。凹陷的特征是有痕量的热液活动和现代的油气渗漏。在267‒485 m深度的气体渗流区，在火成岩复合物中鉴定出的十一种多环芳烃中有九种（总浓度为20至890μg/ kg）。深度为10至250 m的沉积岩仅包含萘同系物，菲和pyr。油渗流区沉积岩中的PAH浓度是气体渗流区中PAH浓度的两倍，其组成（萘同系物，菲，pyr，联苯、,）接近油中PAH的组成。通常，火山口的土壤显示出碳氢化合物散布的晕圈，这可能是由于油气的渗漏和微量的水热活动造成的。这种晕圈的特征在空间上是不同的，因此可以预测未勘探区域的碳氢化合物渗漏。