Early Evolution of the Palaeogene Mull Volcano: An Integrated Volcanological, Geochemical and Geochronological Approach

对北大西洋古近纪火成岩省(NAPIP)各个侵蚀火山中心的火山学和岩石成因研究极大地促进了我们对火山口火山和溢流玄武岩岩浆作用过程的理解(例如，Gooday等人，2018年)。该项目的重点是约60 Ma穆勒火山(或中央杂岩)中心1和中心2的早期演化。自从近100年前的《地质调查回忆录》(Bailey等人)以来，关于Mull Central复合体早期部分的出版很少(Bailey等人。1924年)。穆尔中心杂岩包含了以玄武岩到流纹岩形式的爆炸性喷发的证据，似乎与火山口下沉有关。破火山口内可能的枕状玄武岩表明暴露程度相对较浅，因此地表产物、破火山口底板、边界断层和地下岩浆管道之间的关系将比发生较深侵蚀时更加清晰。在喷出火山事件之前和之后，具有从镁铁质到长英质的一系列成分的主要侵入体、锥体席状和环状岩墙。

Volcanological and petrogenetic research in the various eroded volcanic centres of the North Atlantic Palaeogene Igneous Province (NAPIP) have greatly informed our understanding of processes in both caldera volcanoes and flood basalt magmatism (e.g., Gooday et al., 2018). This project focusses on the early evolution of centres 1 and 2 of the ~60 Ma Mull volcano (or central complex). Very little has been published on the early part of the Mull Central Complex since the Geological Survey Memoir almost 100 years ago (Bailey, et al. 1924). The Mull Central Complex contains evidence for explosive eruptions in the form of basaltic to rhyolitic ignimbrites that appear to be associated with caldera subsidence. Possible pillow basalts within the caldera indicate a relatively shallow level of exposure and so relationships between the surface products, the caldera floor, the bounding faults and the sub-surface magma conduits will be clearer than if deeper erosion had occurred. Major intrusions, cone sheets and ring dykes with a range of compositions from mafic to felsic pre- and post-date the extrusive volcanic events.