A magnetometer survey, conducted with the initial aim of delineating the extent of a magnetite-rich orebody within the Teesdale Fault in the Harwood Valley of Upper Teesdale, unexpectedly revealed a Palaeogene remanent magnetization. This is interpreted as reflecting the presence at depth of a hitherto unrecorded section of the Armathwaite–Cleveland Dyke, a member of the Palaeogene Mull Swarm of intrusions. The dyke has now been continuously mapped magnetically from the easternmost outcrop of its Armathwaite section in the South Tyne Valley, near Garrigill, to the westernmost outcrop of the Cleveland section in Ettersgill, Teesdale, where it follows the Teesdale Fault and undergoes a small dextral en-échelon offset. We retain the originally proposed mechanism for the formation of the orebody, by the interaction between Northern Pennine mineralizing fluids and the still hot, recently intruded Permo-Carboniferous Whin Sill and its contact rocks. We find no evidence of a wider distribution of ore, or of Permian magnetization. We conclude that the orebody was emplaced along the Teesdale fault and that its magnetic signature was thermally re-set during the Palaeogene intrusion.

Roger C. Searle

Brian Young

Elijah Mwandoe

Proceedings of the Yorkshire Geological Society

《约克郡地质学会会刊》（PYGS）自 1839 年以来一直不间断出版。它是英国地质学的主要期刊之一。每年都会发行两部分，其中包含有关地质各个方面的原始研究论文。传统上，会议记录特别关注英格兰北部及其邻近地区的地质情况。鼓励提交有关相关主题但具有更普遍兴趣的论文。所有论文都经过两名独立裁判的全面审查。

The Proceedings of the Yorkshire Geological Society (PYGS) has been published continuously since 1839 and is one of the leading journals in the field of geology in the UK. The journal releases two issues each year, featuring original research papers covering various aspects of geology. The conference proceedings particularly focus on the geological conditions of Northern England and its surrounding areas, while also encouraging submissions on related topics of broader interest. All submitted papers undergo thorough review by two independent referees.

《Proceedings of the Yorkshire Geological Society》（PYGS）自1839年起持续出版，是英国地质学领域的重要期刊之一。该期刊每年发行两期，涵盖地质学各个方面的原创研究论文。会议记录部分特别关注英格兰北部及其邻近地区的地质情况，同时也鼓励提交与相关主题但具有更广泛兴趣的论文。所有提交的论文均经过两名独立审稿人的严格评审。

Category	Quartile
地球科学	4
地球科学, 地质学	4

The Palaeogene Armathwaite–Cleveland Dyke in upper Teesdale, northern England: magnetic characteristics and relationship to mineralization

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