R. Halama, , Wenzel, T., Upton, B. G. J., Siebel, W., Markl, G. (2003) A geochemical and Sr-Nd-O isotopic study of the Proterozoic Eriksfjord Basalts, Gardar Province, South Greenland: Reconstruction of an OIB signature in crustally contaminated rift-related basalts. Mineralogical Magazine, 67 (5) 831-853 doi:10.1180/0026461036750147
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | A geochemical and Sr-Nd-O isotopic study of the Proterozoic Eriksfjord Basalts, Gardar Province, South Greenland: Reconstruction of an OIB signature in crustally contaminated rift-related basalts | ||
| Journal | Mineralogical Magazine | ||
| Authors | R. Halama, | Author | |
| Wenzel, T. | Author | ||
| Upton, B. G. J. | Author | ||
| Siebel, W. | Author | ||
| Markl, G. | Author | ||
| Year | 2003 (October) | Volume | 67 |
| Issue | 5 | ||
| Publisher | Mineralogical Society | ||
| DOI | doi:10.1180/0026461036750147Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 243485 | Long-form Identifier | mindat:1:5:243485:2 |
| GUID | 0 | ||
| Full Reference | R. Halama, , Wenzel, T., Upton, B. G. J., Siebel, W., Markl, G. (2003) A geochemical and Sr-Nd-O isotopic study of the Proterozoic Eriksfjord Basalts, Gardar Province, South Greenland: Reconstruction of an OIB signature in crustally contaminated rift-related basalts. Mineralogical Magazine, 67 (5) 831-853 doi:10.1180/0026461036750147 | ||
| Plain Text | R. Halama, , Wenzel, T., Upton, B. G. J., Siebel, W., Markl, G. (2003) A geochemical and Sr-Nd-O isotopic study of the Proterozoic Eriksfjord Basalts, Gardar Province, South Greenland: Reconstruction of an OIB signature in crustally contaminated rift-related basalts. Mineralogical Magazine, 67 (5) 831-853 doi:10.1180/0026461036750147 | ||
| Abstract/Notes | AbstractBasalts from the volcano-sedimentary Eriksfjord Formation (Gardar Province, South Greenland) were erupted at around 1.2 Ga into rift-related graben structures. The basalts have compositions transitional between tholeiite and alkaline basalt with MgO contents <7 wt.% and they display LREE-enrichment relative to a chondritic source. Most of the trace element and REE characteristics are similar to those of basalts derived from OIB-like mantle sources. Initial 87Sr/86Sr ratios of clinopyroxene separates range from 0.70278 to 0.70383 and initial ϵNd values vary from –3.2 to +2.1. The most unradiogenic samples overlap with the field defined by carbonatites of similar age and can be explained by mixing of isotopically depleted and enriched mantle components. Using AFC modelling equations, the Sr-Nd isotope data of the more radiogenic basalts can successfully be modelled by addition of <5% lower crustal granulite-facies gneisses as contaminants. δ18Ov-smow values of separated clinopyroxene range from +5.2 to +6.0% and fall within the range of typical mantle-derived rocks. However, up to 10% mixing with an average lower crustal component are permitted by the data. | ||
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