Qi, Yue, Wang, Qiang, Zhu, Ying-Tang, Shi, Lian-Chang, Yang, Ya-Nan (2020) Miocene Olivine Leucitites in the Hoh Xil Basin, Northern Tibet: Implications for Intracontinental Lithosphere Melting and Surface Uplift of the Tibetan Plateau. Journal of Petrology, 61 (1) doi:10.1093/petrology/egaa026
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Miocene Olivine Leucitites in the Hoh Xil Basin, Northern Tibet: Implications for Intracontinental Lithosphere Melting and Surface Uplift of the Tibetan Plateau | ||
| Journal | Journal of Petrology | ||
| Authors | Qi, Yue | Author | |
| Wang, Qiang | Author | ||
| Zhu, Ying-Tang | Author | ||
| Shi, Lian-Chang | Author | ||
| Yang, Ya-Nan | Author | ||
| Year | 2020 (September 18) | Volume | 61 |
| Issue | 1 | ||
| Publisher | Oxford University Press (OUP) | ||
| DOI | doi:10.1093/petrology/egaa026Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 532372 | Long-form Identifier | mindat:1:5:532372:6 |
| GUID | 0 | ||
| Full Reference | Qi, Yue, Wang, Qiang, Zhu, Ying-Tang, Shi, Lian-Chang, Yang, Ya-Nan (2020) Miocene Olivine Leucitites in the Hoh Xil Basin, Northern Tibet: Implications for Intracontinental Lithosphere Melting and Surface Uplift of the Tibetan Plateau. Journal of Petrology, 61 (1) doi:10.1093/petrology/egaa026 | ||
| Plain Text | Qi, Yue, Wang, Qiang, Zhu, Ying-Tang, Shi, Lian-Chang, Yang, Ya-Nan (2020) Miocene Olivine Leucitites in the Hoh Xil Basin, Northern Tibet: Implications for Intracontinental Lithosphere Melting and Surface Uplift of the Tibetan Plateau. Journal of Petrology, 61 (1) doi:10.1093/petrology/egaa026 | ||
| In | (2020, September) Journal of Petrology Vol. 61 (1) Oxford University Press (OUP) | ||
| Abstract/Notes | Abstract The generation of MioceneāPliocene post-collisional magmatic rocks in northern Tibet was coeval with surface uplift, meaning that understanding the petrogenesis of these rocks should provide clues to the mechanism of uplift of the Tibetan Plateau. However, the nature of the source(s) of MioceneāPliocene post-collisional rocks is unresolved, especially for potassicāultrapotassic rocks. This study focuses on 16āMa olivine leucitites in the Hoh Xil Basin of northern Tibet, which display the lowest SiO2 (43Ā·4ā48Ā·8āwt%) contents of all MioceneāPliocene magmatic rocks in northern Tibet and have high MgO (4Ā·85ā8Ā·57āwt%) contents and high K2O/Na2O (>1) ratios. Whole-rock geochemical compositions suggest that the olivine leucitites did not undergo significant fractional crystallization or crustal assimilation. All samples are enriched in large ion lithophile elements relative to high field strength elements, and they exhibit uniform whole-rock SrāNd isotope [(87Sr/86Sr)i = 0Ā·7071ā0Ā·7077 and ĪµNd(t) = ā3Ā·1 to ā3Ā·9] and olivine O isotope (5Ā·8ā6Ā·6āā°, mean of 6Ā·2 Ā± 0Ā·2āā°, n = 21) compositions. We propose that the olivine leucitites were derived by low-degree partial melting of phlogopite-lherzolite in garnet-facies lithospheric mantle. Given the tectonic evolution of the Hoh Xil Basin and adjacent areas, we suggest that southward subduction of Asian (Qaidam block) lithosphere after IndiaāAsia collision transferred potassium and other incompatible elements into the lithospheric mantle, forming the K-enriched mantle source of the MioceneāPliocene potassicāultrapotassic rocks. Removal of lower lithospheric mantle subsequently induced voluminous MioceneāPliocene magmatism and generated >1ākm surface uplift in the Hoh Xil Basin. | ||
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