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- W2008693644 abstract "The best place to seek evidence of the style of past magma flow through a conduit is in the country rock. Heat flow has been studied in country rock adjacent to two Tertiary dolerite sills intruding the Caledonian schists and quartzites, on the Isle of Mull, Scotland. Radiogenic 40 Ar loss within mica grains in the thermal aureoles of the intrusions has been measured at high spatial resolution using the Ultra‐Violet Laser Ablation Micro‐Probe, to discriminate between a history of prolonged magma flow, a history of conductive cooling following laminar flow, and instantaneous emplacement of the intrusions. The 40 Ar/ 39 Ar mica data and thermal modeling suggest that a prolonged period of magma flow of 3–5 months resulted in extensive argon loss from the micas, country rock melting, and mineral breakdown adjacent to a 6‐m sill. These features were absent from the wall rocks of a smaller 2.7‐m‐thick sill, which exhibited even less argon loss than might have been predicted for an instantaneous intrusion. If the heat loss from the 6‐m sill observed in one locality had been repeated along its length, it would have formed an important magma conduit to the Mull volcano, but dolerite is not a common flow composition on Mull. If on the other hand, the heat loss from the sill varies along strike, it constitutes strong evidence for channelling and heterogeneous flow within the sill." @default.
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- W2008693644 date "2001-03-10" @default.
- W2008693644 modified "2023-10-14" @default.
- W2008693644 title "Magma flow regimes in sills deduced from Ar isotope systematics of host rocks" @default.
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- W2008693644 doi "https://doi.org/10.1029/2000jb900327" @default.
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