Zircon U-Pb age and Hf isotope composition of a quartz vein in ultrahigh-pressure eclogite from the western Dabie orogen

2009 ◽  
Vol 54 (10) ◽  
pp. 1449-1454 ◽  
Author(s):  
HuJun GONG ◽  
SaiHong YANG ◽  
Min PENG ◽  
XiaoChi LIU ◽  
WenFang JIAO ◽  
...  
Keyword(s):  
Quartz Vein ◽  
Isotope Composition ◽  
Hf Isotope ◽  
Ultrahigh Pressure ◽  
Dabie Orogen

A new method to determine both water content and hydrogen isotope composition of two forms of water in nominally anhydrous minerals

2020 ◽  
Author(s):  
Bing Gong ◽  
Ren-Xu Chen ◽  
Yong-Fei Zheng
Keyword(s):  
Water Content ◽  
Mass Spectrometer ◽  
Isotope Composition ◽  
High Vacuum ◽  
Thermal Conversion ◽  
Ultrahigh Pressure ◽  
Molecular Water ◽  
Dabie Orogen ◽  
Nominally Anhydrous Minerals ◽  
Structural Hydroxyl

<p>    A new continuous flow method, by combining high vacuum stepwise-heating (HVST) device with the thermal conversion elemental analyzer and gas isotope mass spectrometer (TC/EA-MS), is presented for determination of water contents and H isotope compositions for both structural hydroxyl and molecular water in garnet. By using the HVST device, molecular water and structural hydroxyl can be liberated step by step from garnet at different heating temperatures. By using the on-line quadrupole mass spectrometer in the HVST device, heating temperatures were determined for releasing the two forms of water from garnet from ultrahigh-pressure metamorphic eclogite in the Dabie orogen. Releasing temperatures of molecular water and structural hydroxyl from the garnet are 400°C and 1400°C, respectively. The garnet gives water of 228±39 ppm and a dD value of -110±10‰ for molecular water at dehydration temperature of 400°C for 1 hour, and water of 301±27 ppm and a dD value of -81±4‰ for structural OH at dehydration temperature of 1400°C for 1 hour. Therefore, the HVST-TC/EA-MS method can be used to analyze both water content and H isotope composition of the two forms of water in nominally anhydrous minerals.</p>

Two-Stage Exhumation of Ultrahigh-Pressure Metamorphic Rocks from the Western Dabie Orogen, Central China

2011 ◽  
Vol 119 (1) ◽  
pp. 15-31 ◽  
Author(s):  
Yuanbao Wu ◽  
Shan Gao ◽  
Xiaochi Liu ◽  
Jing Wang ◽  
Min Peng ◽  
...  
Keyword(s):  
Central China ◽  
Ultrahigh Pressure ◽  
Metamorphic Rocks ◽  
Two Stage ◽  
Dabie Orogen

The Hf isotope composition of global seawater and the evolution of Hf isotopes in the deep Pacific Ocean from Fe–Mn crusts

2001 ◽  
Vol 178 (1-4) ◽  
pp. 23-42 ◽  
Author(s):  
K David ◽  
M Frank ◽  
R.K O'Nions ◽  
N.S Belshaw ◽  
J.W Arden
Keyword(s):  
Pacific Ocean ◽  
Isotope Composition ◽  
Hf Isotope ◽  
Hf Isotopes

scholarly journals Detrital Zircon U-Pb Geochronology and Hf Isotope Geochemistry of the Hayang Group, SE Korea and the Himenoura and Goshoura Groups, SW Japan: Signs of Subduction-Related Magmatism after a Long Resting Period

Minerals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 936
Author(s):  
Tae-Ho Lee ◽  
Kye-Hun Park
Keyword(s):  
Early Cretaceous ◽  
Isotope Geochemistry ◽  
Isotope Composition ◽  
Sediment Supply ◽  
Detrital Zircons ◽  
Hf Isotope ◽  
Ridge Subduction ◽  
The Pacific ◽  
Orogenic Cycle ◽  
T Values

There was a hiatus in magmatism in Korea and Japan, located on the eastern continental margin of Asia, during a period of about 40 Ma from 160 Ma to 120 Ma. The cause of the resumption of magmatism since then is not yet well understood. In this study, we analyzed the Hf isotope composition of detrital zircons in the Cretaceous sediments of Korea (Hayang Group) and Japan (Goshoura and Himenoura groups) to investigate the tectonic evolution of eastern Asia in the Early Cretaceous period. εHf(t) in Cretaceous zircons from Japanese samples values from +8.2 to +0.1, suggesting that magmatism was sourced from the depleted juvenile materials, which is compatible with ridge subduction and subsequent melting of the young oceanic crust. εHf(t) values from Cretaceous zircons in the Hayang Group are negative, except for the Jindong Formation, which had a sediment supply from Japan, indicating that the old continental crust material of the Korean Peninsula was included in the magma generation. The detrital zircons of this study exhibit a depleted isotopic character at the beginning of subduction-related magmatism in Permian and Early Cretaceous, and then gradually change to a more enriched composition. This trend may be a typical example of the Pacific-type orogenic cycle.

Postcollisional flow of aqueous fluid within ultrahigh-pressure eclogite in the Dabie orogen

2006 ◽  
Vol 89 (1-3) ◽  
pp. 115-118 ◽  
Author(s):  
Tian-Shan Gao ◽  
Song-Shan Wang ◽  
Bing Gong ◽  
Yuan-Bao Wu ◽  
Yong-Fei Zheng
Keyword(s):  
Aqueous Fluid ◽  
Ultrahigh Pressure ◽  
Dabie Orogen
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