| Reference Type | Journal (article/letter/editorial) |
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| Title | Geologic transect across the Grenville orogen of Ontario and New York |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Carr, S D | Author |
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| Easton, R M | Author |
| Jamieson, R A | Author |
| Culshaw, N G | Author |
| Year | 2000 (April 2) | Volume | 37 |
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| Issue | 2 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/e99-074Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 483353 | Long-form Identifier | mindat:1:5:483353:0 |
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| GUID | 0 |
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| Full Reference | Carr, S D, Easton, R M, Jamieson, R A, Culshaw, N G (2000) Geologic transect across the Grenville orogen of Ontario and New York. Canadian Journal of Earth Sciences, 37 (2) 193-216 doi:10.1139/e99-074 |
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| Plain Text | Carr, S D, Easton, R M, Jamieson, R A, Culshaw, N G (2000) Geologic transect across the Grenville orogen of Ontario and New York. Canadian Journal of Earth Sciences, 37 (2) 193-216 doi:10.1139/e99-074 |
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| In | (2000, April) Canadian Journal of Earth Sciences Vol. 37 (2) Canadian Science Publishing |
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| Abstract/Notes | Revised cross sections of the western Grenville Province incorporate new geologic results and reprocessed seismic reflection data. The geology is presented in terms of three tectonic elements: (1) "pre-Grenvillian Laurentia and its margin" with ca. 1740 and 1450 Ma continental arc plutons and associated supracrustal rocks; (2) "Composite Arc Belt" of allochthonous ~1300-1250 Ma volcanic arcs and sedimentary rocks; and (3) "Frontenac-Adirondack Belt" characterized by supracrustal and granitoid rocks, and anorthosites, of uncertain affinity, that may represent a distinctive part of the Composite Arc Belt or an offshore (micro)continent. Rocks of the Composite Arc and Frontenac-Adirondack belts were amalgamated with each other by ca. 1160 Ma, were then thrust over Laurentia during ca. 1080-1035 Ma and ca. 1010-980 Ma phases of convergence, and were dissected and exhumed by <1040 Ma normal faults. Penetrative deformation was restricted to that part of the pre-Grenvillian Laurentian margin that lies to the southeast of the Grenville front and parts of the accreted Composite Arc and Frontenac-Adirondack belts. The Laurentian rocks in the Grenville Province are bounded to the northwest and southeast by southeast-dipping ductile thrust and (or) normal shear zones. The Composite Arc and Frontenac-Adirondack belts to the southeast are bounded by ductile and brittle-ductile thrust and (or) normal faults that separate domains with contrasting cooling histories. Despite a long pre-Grenvillian tectonic and plutonic history, the present crustal architecture and much of the seismic reflectivity were acquired during 1080-980 Ma phases of compression and extension. |
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