Sr–Nd–Hf isotopes of the intrusive rocks in the Cretaceous Xigaze ophiolite, southern Tibet: Constraints on its formation setting

Lithos ◽  
2016 ◽  
Vol 258-259 ◽  
pp. 133-148 ◽  
Author(s):  
Liang-Liang Zhang ◽  
Chuan-Zhou Liu ◽  
Fu-Yuan Wu ◽  
Chang Zhang ◽  
Wei-Qiang Ji ◽  
...  
Keyword(s):  
Hf Isotopes ◽  
Southern Tibet ◽  
Intrusive Rocks

The role of clinopyroxene in amphibole fractionation of arc magmas: Evidence from mafic intrusive rocks within the Gangdese arc, southern Tibet

Lithos ◽  
2019 ◽  
Vol 338-339 ◽  
pp. 174-188 ◽  
Author(s):  
Jun Wang ◽  
Qiang Wang ◽  
Wei Dan ◽  
Jin-Hui Yang ◽  
Zong-Yong Yang ◽  
...  
Keyword(s):  
Southern Tibet ◽  
Arc Magmas ◽  
Intrusive Rocks ◽  
Amphibole Fractionation

scholarly journals Zircon U–Pb geochronology, Hf isotopes and geochemistry of intrusive rocks in the Gazu copper deposit, Iran: Petrogenesis and geological implications

2016 ◽  
Vol 72 ◽  
pp. 818-837 ◽  
Author(s):  
Amir Mahdavi ◽  
Mohammad Hassan Karimpour ◽  
Jingwen Mao ◽  
Mohammad Reza Haidarian Shahri ◽  
Azadeh Malekzadeh Shafaroudi ◽  
...  
Keyword(s):  
Copper Deposit ◽  
Hf Isotopes ◽  
Intrusive Rocks ◽  
Geological Implications

Late Cretaceous (ca. 90Ma) adakitic intrusive rocks in the Kelu area, Gangdese Belt (southern Tibet): Slab melting and implications for Cu–Au mineralization

2012 ◽  
Vol 53 ◽  
pp. 67-81 ◽  
Author(s):  
Zi-Qi Jiang ◽  
Qiang Wang ◽  
Zheng-Xiang Li ◽  
Derek A. Wyman ◽  
Gong-Jian Tang ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Slab Melting ◽  
Southern Tibet ◽  
Intrusive Rocks

scholarly journals Isotopes Features of the Intrusive Rocks in the Xigaze Ophiolite, Southern Tibet: Constraints on its Formation Setting

2020 ◽  
Author(s):  
Liangliang Zhang ◽  
Chuanzhou Liu ◽  
Fuyuan Wu ◽  
Chang Zhang ◽  
Weiqiang Ji ◽  
...  
Keyword(s):  
Southern Tibet ◽  
Intrusive Rocks

scholarly journals Identifying crystal accumulation and melt extraction during formation of high-silica granite

Geology ◽  
2021 ◽  
Author(s):  
Tian-Yu Lu ◽  
Zhen-Yu He ◽  
Reiner Klemd
Keyword(s):  
Trace Elements ◽  
Magma Source ◽  
Separation Processes ◽  
Southern Tibet ◽  
Intrusive Rocks ◽  
Melt Separation ◽  
Ca 50 ◽  
High Silica ◽  
Crystal Accumulation ◽  
Zircon Trace Elements

High-silica (<70 wt% SiO2) magmas are usually believed to form via shallow crustal–level fractional crystallization of intermediate magmas. However, the broad applicability of this model is controversial, because the required crystal-melt separation processes have rarely been documented globally up to now. The ca. 50 Ma Nyemo composite pluton of the Gangdese batholith belt in southern Tibet, which comprises intrusive rocks with intermediate- to high-silica compositions (65–78 wt%), offers a unique opportunity for substantiating the coexistence of extracted melts and complementary silicic cumulates in one of Earth’s most complete transcrustal silicic magmatic systems. The Nyemo pluton intrusive rocks exhibit similar zircon Hf isotopic compositional ranges (mean εHf(t) = +5.7 to +8.3), suggesting a common, non-radiogenic magma source with crustal assimilation in the deep crust. Yet, these rocks have distinct geochemical characteristics. High-silica miarolitic and rapakivi granites are strongly depleted in Ba, Sr, and Eu, and their zircon trace elements show extremely low Eu/Eu* and Dy/Yb. In contrast, monzogranite is relatively enriched in Ba and Sr with minor Eu anomalies, and the zircon trace elements are characterized by relatively high Eu/Eu* and Dy/Yb. Therefore, we propose that the high-silica granites represent highly fractionated melt extracted from a mush reservoir at unusually low storage pressure (~99–119 MPa), and that the monzogranite constitutes the complementary residual silicic cumulates.

Zircon U-Pb geochronology, Hf isotopes and geochemistry of intrusive rocks in the Simorgh prospecting area, Lut Block, eastern Iran: petrogenesis and geological implications

2018 ◽  
Vol 22 (5) ◽  
pp. 711-732
Author(s):  
Reza Borabadi ◽  
Seyed Ahmad Mazaheri ◽  
Mohammad Hassan Karimpour ◽  
Sebastien Meffre ◽  
Jay Thompson ◽  
...  
Keyword(s):  
Hf Isotopes ◽  
Lut Block ◽  
Eastern Iran ◽  
Intrusive Rocks ◽  
Geological Implications
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