| Reference Type | Journal (article/letter/editorial) |
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| Title | Gravity and magnetic signatures of the Ackley Granite Suite, southeastern Newfoundland: implications for magma emplacement |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Miller, H. G. | Author |
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| Tuach, J. | Author |
| Year | 1989 (December 1) | Volume | 26 |
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| Issue | 12 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/e89-229Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 480329 | Long-form Identifier | mindat:1:5:480329:8 |
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| GUID | 0 |
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| Full Reference | Miller, H. G., Tuach, J. (1989) Gravity and magnetic signatures of the Ackley Granite Suite, southeastern Newfoundland: implications for magma emplacement. Canadian Journal of Earth Sciences, 26 (12) 2697-2709 doi:10.1139/e89-229 |
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| Plain Text | Miller, H. G., Tuach, J. (1989) Gravity and magnetic signatures of the Ackley Granite Suite, southeastern Newfoundland: implications for magma emplacement. Canadian Journal of Earth Sciences, 26 (12) 2697-2709 doi:10.1139/e89-229 |
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| In | (1989, December) Canadian Journal of Earth Sciences Vol. 26 (12) Canadian Science Publishing |
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| Abstract/Notes | A detailed gravity survey (255 stations over an area of 3000 km2) over the posttectonic, Devonian, Ackley Granite Suite in southeastern Newfoundland suggests that a set of northwest-trending geophysical lineations, interpreted as faults, controlled the bottom morphology of the magma chamber during emplacement.The main negative Bouguer gravity anomaly over the Ackley Granite Suite trends in a north–south direction across the trace of the Dover – Hermitage Bay Fault, the boundary between the Gander and Avalon terranes. Inversion of the gravity and density data indicates that the thickness of the granite suite varies between 2 and 8 km.Magnetic interpretation and modelling suggest that the southeast portion of the suite is underlain by mafic volcanic rocks typical of the Avalon Terrane. The magnetically determined depth to the top of these is consistent with that calculated from the gravity data.The combined geophysical models are indicative of a process of megablock stoping in which large crustal blocks were displaced downwards in midcrustal regions to permit the emplacement of what is now the Ackley Granite Suite and associated plutons. |
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