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Hafnium isotope characteristics of late Palaeoproterozoic magmatic rocks from Blekinge, southeast Sweden: possible correlation of small-scale Hf and Nd isotope variations in zircon and whole-rocks.
Naturhistoriska riksmuseet, Enheten för geovetenskap.ORCID-id: 0000-0002-1598-5231
Universitetet i Oslo.
Universitetet i Oslo.
2015 (Engelska)Ingår i: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 137, nr 1, s. 74-82Artikel i tidskrift (Refereegranskat) Published
Ort, förlag, år, upplaga, sidor
2015. Vol. 137, nr 1, s. 74-82
Nyckelord [en]
lutetium–hafnium; hafnium isotopes; granitoids; mildly depleted mantle; Palaeoproterozoic;
Nationell ämneskategori
Geologi
Identifikatorer
URN: urn:nbn:se:nrm:diva-1171DOI: 10.1080/11035897.2014.992469OAI: oai:DiVA.org:nrm-1171DiVA, id: diva2:791680
Anmärkning

The isotopic composition of hafnium has been measured in zircons from seven magmatic rocks from the Blekinge region, southeast Sweden, previously dated by the U–Pb zircon method to 1.74–1.76 Ga, with one rock at 1.81 Ga. The results from all samples show limited variation, with a totalrange in initial Eps-Hf between -1.5 and +3.2, only slightly more than analytical uncertainty (+/-1.5 epsilon units). However, taken together with previously published initial Eps-Nd whole-rock values of -0.3 to +1.0 from the same rock samples, a trend with a positive correlation between average initial Eps-Hf (zr) for each sample and initial Eps-Nd (WR) can be discerned. This trend could be taken to indicate mixing between a “mildly depleted” component derived from the lithospheric mantle or lower crust, and a slightly more enriched crustal component, either by mixing of separate magmas or by contamination of a mantlederived magma with crustal material. Such mixing may have occurred both on a regional scale, as indicated by the overall trend, and locally within each intrusion and each rock sample with small-scale variations in isotope composition of the magma during crystallization, indicated by the variation in initial Epsilon Hf between the zircons in each sample. The overall results support the presence of a “mildly depleted” lithospheric mantle reservoir, both in terms of Nd and Hf isotopes, also beneath southern Fennoscandia in Proterozoic time.

Tillgänglig från: 2015-03-02 Skapad: 2015-03-02 Senast uppdaterad: 2017-12-04Bibliografiskt granskad

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