THE ACKLINGTON DYKE—A PROTON MAGNETOMETER SURVEY

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Abstract
Summary: The Acklington Dyke, a tholeiitic dolerite in north-west Northumberland, is a member of the Tertiary Mull swarm and is intruded into Lower Old Red Sandstone lavas and Lower Carboniferous sediments. It was surveyed for fifteen miles from Hophills Nob in Roxburghshire to Alwinton in Northumberland by means of a proton magnetometer which is a highly sensitive instrument and capable of rapid manipulation. The dyke has been cut by numerous faults, chiefly trending between 040 and 050 degrees, and has been shifted by almost all; in most cases the movement is sinistral. The latest movement occurred after the phase of dyke intrusion which was probably of Lower Miocene age. Southwards the Outer Pennine Fault on the edge of the Alston Block is known to be Tertiary; it is suggested that the Craven and Dent faults as well may have been involved in the same Tertiary transcurrent movements that shifted the Acklington Dyke in Northumberland.

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