On the role of contamination and hybridism in formation of the composite Raumid pluton granites (Pamir Mnts.): Results of Sm–Nd Isotope Study
| Autor: | A. Yu. Kramchaninov, K. N. Shatagin, V. N. Volkov |
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| Rok vydání: | 2016 |
| Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences Isotope Pluton Trace element Geochemistry Fold (geology) Massif Contamination 010502 geochemistry & geophysics 01 natural sciences Bulk samples Isotope study Earth and Planetary Sciences (miscellaneous) General Earth and Planetary Sciences Geology 0105 earth and related environmental sciences |
| Zdroj: | Doklady Earth Sciences. 470:981-984 |
| ISSN: | 1531-8354 1028-334X |
| Popis: | This work presents isotope Sm-Nd data obtained for bulk samples of granites of all 8 emplacement phases of the Raumid granite massif, which occurred 35 Ma ago at a hypabyssal depth during the orogenic stage of development of Southern Pamir fold system. The 147Sm/144Nd ratio in studied collection of granite samples ranges between 0.091 and 0.323; the eNd(T) value is–4.0. The Sm-Nd isotope study results suggest that all granite varieties distinguished in the Raumid massif are comagmatic formations and contamination and hybridization processes did not play any role in REE distribution in granites. At this, the source of parental magma did not change during granite generation. We assume that the only process, resulted in the trace element evolution in granites, was differentiation of three batches of magma sequentially uplifted from the source. |
| Databáze: | OpenAIRE |
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