if Lu-Hf isotopes εHf(t) values are coming positive ranging from +7.3 to +17.5 , Is This type of values only indicates that material is From Newly formed crust or contamination of both crust and Mantle source?
suggest me any pioneer paper for understanding the environment of such rocks which have these types of Lu-Hf isotopes εHf(t) values positive.
It depends.
If the ancient crust have high positive εHf(t) values, the samples you have may indicate the reworking of the crust. On the other hand, if the ancient crust have εHf(t) values much lower than the samples, high positive εHf(t) values imply crust growth.
Rock or let's say magmas (granitoid) with high values of ƐHf (t) >>0 represent juvenile mantle input, either directly via mantle-derived mafic melts or by by remelting of young mantle-derived mafic lower crust (see Kroner et al., 2013GR: Reassessment of continental growth during the accretionary history of the Central Asian Orogenic Belt. Gondwana Research 25 (2014) 103–125). In contrast, values of ƐHf (t)
Sorry the Kroner et al is not 2013, it's 2014. The reference is correct.
Better also to see
Vervoort, J.D., Patchett, P.J., Blichert-Toft, J., Albarède, F., 1999. Relationships between Lu–Hf and Sm-Nd isotopic systems in the global sedimentary system. Earth and Planetary Science Letters 168, 79–99.
- Badges
- Science method
- Similar topics
- Biological Science
- Ecology