DRAUT, AMY E., CLIFT, PETER D., CHEW, DAVID M., COOPER, MATTHEW J., TAYLOR, REX N., HANNIGAN, ROBYN E. (2004) Laurentian crustal recycling in the Ordovician Grampian Orogeny: Nd isotopic evidence from western Ireland. Geological Magazine, 141 (2) 195-207 doi:10.1017/s001675680400891x
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Laurentian crustal recycling in the Ordovician Grampian Orogeny: Nd isotopic evidence from western Ireland | ||
| Journal | Geological Magazine | ||
| Authors | DRAUT, AMY E. | Author | |
| CLIFT, PETER D. | Author | ||
| CHEW, DAVID M. | Author | ||
| COOPER, MATTHEW J. | Author | ||
| TAYLOR, REX N. | Author | ||
| HANNIGAN, ROBYN E. | Author | ||
| Year | 2004 (March) | Volume | 141 |
| Issue | 2 | ||
| Publisher | Cambridge University Press (CUP) | ||
| DOI | doi:10.1017/s001675680400891xSearch in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 259388 | Long-form Identifier | mindat:1:5:259388:7 |
| GUID | 0 | ||
| Full Reference | DRAUT, AMY E., CLIFT, PETER D., CHEW, DAVID M., COOPER, MATTHEW J., TAYLOR, REX N., HANNIGAN, ROBYN E. (2004) Laurentian crustal recycling in the Ordovician Grampian Orogeny: Nd isotopic evidence from western Ireland. Geological Magazine, 141 (2) 195-207 doi:10.1017/s001675680400891x | ||
| Plain Text | DRAUT, AMY E., CLIFT, PETER D., CHEW, DAVID M., COOPER, MATTHEW J., TAYLOR, REX N., HANNIGAN, ROBYN E. (2004) Laurentian crustal recycling in the Ordovician Grampian Orogeny: Nd isotopic evidence from western Ireland. Geological Magazine, 141 (2) 195-207 doi:10.1017/s001675680400891x | ||
| In | (2004, March) Geological Magazine Vol. 141 (2) Cambridge University Press (CUP) | ||
| Abstract/Notes | Because magmatism associated with subduction is thought to be the principal source for continental crust generation, assessing the relative contribution of pre-existing (subducted and assimilated) continental material to arc magmatism in accreted arcs is important to understanding the origin of continental crust. We present a detailed Nd isotopic stratigraphy for volcanic and volcaniclastic formations from the South Mayo Trough, an accreted oceanic arc exposed in the western Irish Caledonides. These units span an arcācontinent collision event, the Grampian (Taconic) Orogeny, in which an intra-oceanic island arc was accreted onto the passive continental margin of Laurentia starting at ā¼ 475 Ma (Arenig). The stratigraphy corresponding to pre-, syn- and post-collisional volcanism reveals a progression of ĪµNd(t) from strongly positive values, consistent with melt derivation almost exclusively from oceanic mantle beneath the arc, to strongly negative values, indicating incorporation of continental material into the melt. Using ĪµNd(t) values of meta-sediments that represent the Laurentian passive margin and accretionary prism, we are able to quantify the relative proportions of continent-derived melt at various stages of arc formation and accretion. Mass balance calculations show that mantle-derived magmatism contributes substantially to melt production during all stages of arcācontinent collision, never accounting for less than 21% of the total. This implies that a significant addition of new, rather than recycled, continental crust can accompany arcācontinent collision and continental arc magmatism. | ||
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