The Sośnica Hill volcano is part of the Oligocene to Miocene (30.9–20.0 Ma) Strzelin volcanic field. . It is located 100 km east of the Ohře Rift in the eastern part of the Fore-Sudetic Block, south of the town of Strzelin, Poland. Modern quarrying has exposed the sub-volcanic magma feeder system of the central part of the volcano and an extrusive volcanic succession that includes a 40 m thick sequence of lava flows and pyroclastic deposits that collectively form a complex scoria cone. Geophysical data (ground magnetometry and electric resistivity tomography (ERT)) reveal sharp linear anomalies that are interpreted to reflect normal faults dissecting the volcano. The ERT data map both high and low resistivity bodies, likely representing coherent clay-free dry rocks and partly argilized volcaniclastic deposits, respectively. Paleomagnetic data from 20 intrusive sites reveal two populations of reverse polarity site mean data; 11 sites are of low dispersion and yield a group mean direction that is discordant to the expected field direction, while six sites are highly scattered. Three sites did not yield interpretable results. We interpret the 11 sites as time-averaged field directions that are discordant to the expected field. The high dispersion of the remaining six sites are interpreted to indicate sub-volcanic deformation associated with the growth of the volcanic construct or multiple magma pulses over an extended period of time relative to secular variation. AMS data from 35 sites show a range of flow directions that vary across the quarry without an orderly pattern of fabric orientations. The flow pattern identified from dike paired margin data exhibits sub-vertical upward flow, sub-vertical downward, and moderately inclined northwest flow. Field observations and mapping indicate a complex development of the system in terms of styles of eruptive activity and structure of the final volcanic edifice. The activity included Strombolian and effusive phases, followed by phreatomagmatic, Hawaiian and again effusive eruptions. Such diversity of eruptive styles shows that the origin of the volcano is more complex than a simple, ‘textbook’ monogenetic scoria cone. Palaesoil on top of Strombolian deposits document a longer break in activity, after which eruptions resumed with different style; this is also not typical of monogenetic cones. The lateral variation in the volcanic succession suggests eruptions from several smaller, local vents. The complex subvolcanic magma flow patterns recorded in dikes match the variation of surface eruptive products and documents dynamically changing magma distribution paths in the near-surface and intra-cone part of the feeding system of the volcano.

Sośnica Hill 火山是渐新世至中新世 (30.9–20.0 Ma) Strzelin 火山区的一部分。. 它位于波兰 Strzelin 镇以南的 Fore-Sudetic Block 东部的 Ohře Rift 以东 100 公里处。现代采石业暴露了火山中央部分的亚火山岩浆供给系统和喷出的火山序列，其中包括 40 m 厚的熔岩流和火山碎屑沉积序列，它们共同形成了一个复杂的火山渣锥。地球物理数据（地面磁力测量和电阻率层析成像 (ERT)）揭示了尖锐的线性异常，这些异常被解释为反映了解剖火山的正常断层。ERT 数据绘制了高电阻率和低电阻率体，可能分别代表连贯的无粘土干岩和部分泥质火山碎屑沉积物。来自 20 个侵入地点的古地磁数据揭示了两组反极性地点的平均数据；11个站点低分散，产生与预期场方向不一致的组平均方向，而6个站点高度分散。三个站点没有产生可解释的结果。我们将 11 个站点解释为与预期场不一致的时间平均场方向。其余六个地点的高度分散被解释为表明与火山构造的生长或多个岩浆脉冲在较长时间内相对于长期变化相关的次火山变形。来自 35 个站点的 AMS 数据显示了整个采石场的一系列流向，这些流向没有有序的织物方向模式。从堤防配对边缘数据中识别出的流型呈现出亚垂直向上流动、亚垂直向下流动和适度倾斜的西北流。实地观察和测绘表明，该系统在喷发活动类型和最终火山建筑物的结构方面有着复杂的发展。活动包括 Strombolian 和喷发阶段，然后是水岩浆喷发、夏威夷喷发和再次喷发。喷发样式的这种多样性表明火山的起源比简单的“教科书”单基因火山渣锥更复杂。Strombolian 沉积物顶部的古土壤记录了较长时间的活动中断，之后又以不同的方式恢复了喷发；这也不是典型的单基因锥体。火山序列的横向变化表明来自几个较小的局部喷口的喷发。