Thickening and partial melting of the Northern Qinling Orogen, China: insights from zircon U–Pb geochronology and Hf isotopic composition of migmatites

2019 ◽  
Vol 176 (6) ◽  
pp. 1218-1231 ◽  
Author(s):  
Shengsi Sun ◽  
Yunpeng Dong ◽  
Dengfeng He ◽  
Chao Cheng ◽  
Xiaoming Liu
Keyword(s):  
Isotopic Composition ◽  
Partial Melting ◽  
Qinling Orogen ◽  
Hf Isotopic Composition

Tectonic affinity and evolution of the A lxa B lock during the N eoproterozoic: C onstraints from zircon U‐Pb dating, trace elements, and Hf isotopic composition

2018 ◽  
Vol 54 (6) ◽  
pp. 3700-3719
Author(s):  
Wenzhou Xiao ◽  
Jianqing Lai ◽  
Jeffrey M. Dick ◽  
Xiancheng Mao ◽  
Yan Chen ◽  
...  
Keyword(s):  
Trace Elements ◽  
Isotopic Composition ◽  
Hf Isotopic Composition

New Discovery and Zircon Hf Isotopic Composition of the Early Yanshannian Monzogranite in the Yingyangguan Group of Eastern Guangxi, China

2018 ◽  
Vol 92 (4) ◽  
pp. 1653-1655
Author(s):  
Xiang LI ◽  
Bing TU ◽  
Lingzhan WANG ◽  
Yang TIAN ◽  
Guogang XIE ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Hf Isotopic Composition ◽  
New Discovery

Control of redox state and Sr isotopic composition of granitic magmas: a critical evaluation of the role of source rocks

1996 ◽  
Vol 87 (1-2) ◽  
pp. 321-329 ◽  
Author(s):  
Michel Pichavant ◽  
Tahar Hammouda ◽  
Bruno Scaillet
Keyword(s):  
Isotopic Composition ◽  
Partial Melting ◽  
Source Rock ◽  
Critical Evaluation ◽  
Experimental Studies ◽  
Source Rocks ◽  
Granitic Rocks ◽  
Recent Experimental Data ◽  
Underlying Assumption ◽  
Rock Model

ABSTRACT:The current underlying assumption in most geochemical studies of granitic rocks is that granitic magmas reflect their source regions. However, the mechanisms by which source rocks control the intensive and compositional parameters of the magmas remain poorly known. Recent experimental data are used to evaluate the ‘source rock model’ and to discuss controls of (1) redox states and (2) the Sr isotopic compositions of granitic magmas.Experimental studies have been performed in parallel on biotite-muscovite and tourmaline-muscovite leucogranites from the High Himalayas. Results under reducing conditions ( = FMQ – 0·5) at 4 kbar and variable suggest that the tourmaline-muscovite granite evolved under progressively more oxidising conditions during crystallisation, up to values more than four log units above the FMQ buffer. Leucogranite magmas thus provide an example of the control of redox conditions by post-segregation rather than by partial melting processes.Other experiments designed to test the mechanisms of isotopic equilibration of Sr during partial melting of a model crustal assemblage show that kinetic factors can dominate the isotopic signature in the case of source rocks not previously homogenised during an earlier metamorphic event. The possibility is therefore raised that partial melts may not necessarily reflect the Sr isotopic composition of their sources, weakening in a fundamental way the source rock model.

Geochemistry and zircon U–Pb ages and Hf isotopic composition of Permian alkali granitoids of the Phan Si Pan zone in northwestern Vietnam

2013 ◽  
Vol 69 ◽  
pp. 106-121 ◽  
Author(s):  
Phạm Trung Hiếu ◽  
Fu-kun Chen ◽  
Nguyễn Thị Bích Thủy ◽  
Nguyễn Quốc Cu’ò’ng ◽  
Shuang-quing Li
Keyword(s):  
Isotopic Composition ◽  
Hf Isotopic Composition
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