scholarly journals Sm-Nd and Lu-Hf Isotope Geochemistry of the Himalayan High- and Ultrahigh-Pressure Eclogites, Kaghan Valley, Pakistan

10.5772/32859 ◽  
2012 ◽  
Author(s):  
Hafiz Ur ◽  
Katsura Kobayashi ◽  
Tatsuki Tsujimori ◽  
Tsutomu Ota ◽  
Eizo Nakamura ◽  
...  
Keyword(s):  
Isotope Geochemistry ◽  
Hf Isotope ◽  
Ultrahigh Pressure

scholarly journals U–Pb Age and Hf Isotope Geochemistry of Detrital Zircons from Cambrian Sandstones of the Severnaya Zemlya Archipelago and Northern Taimyr (Russian High Arctic)

Minerals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 36 ◽  
Author(s):  
Victoria B. Ershova ◽  
Andrei V. Prokopiev ◽  
Andrey K. Khudoley ◽  
Tom Andersen ◽  
Kåre Kullerud ◽  
...  
Keyword(s):  
Detrital Zircon ◽  
Isotope Geochemistry ◽  
High Arctic ◽  
Detrital Zircons ◽  
Hf Isotope ◽  
Magmatic Arc ◽  
Novaya Zemlya ◽  
Late Neoproterozoic ◽  
Severnaya Zemlya ◽  
Severnaya Zemlya Archipelago

U–Pb and Lu–Hf isotope analyses of detrital zircons collected from metasedimentary rocks from the southern part of Kara Terrane (northern Taimyr and Severnaya Zemlya archipelago) provide vital information about the paleogeographic and tectonic evolution of the Russian High Arctic. The detrital zircon signatures of the seven dated samples are very similar, suggesting a common provenance for the clastic detritus. The majority of the dated grains belong to the late Neoproterozoic to Cambrian ages, which suggests the maximum depositional age of the enclosing sedimentary units to be Cambrian. The εHf(t) values indicate that juvenile magma mixed with evolved continental crust and the zircons crystallized within a continental magmatic arc setting. Our data strongly suggest that the main provenance for the studied clastics was located within the Timanian Orogen. A review of the available detrital zircon ages from late Neoproterozoic to Cambrian strata across the wider Arctic strongly suggests that Kara Terrane, Novaya Zemlya, Seward Peninsula (Arctic Alaska), Alexander Terrane, De Long Islands, and Scandinavian Caledonides all formed a single tectonic domain during the Cambrian age, with clastics predominantly sourced from the Timanian Orogen.

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.

Insights into the petrogenesis of an intraplate volcanic province: Sr-Nd-Pb-Hf isotope geochemistry of the Bathymetrists Seamount Province, eastern equatorial Atlantic

2020 ◽  
Vol 544 ◽  
pp. 119599
Author(s):  
Xiaojun Long ◽  
Froukje M. van der Zwan ◽  
Jörg Geldmacher ◽  
Kaj Hoernle ◽  
Folkmar Hauff ◽  
...  
Keyword(s):  
Isotope Geochemistry ◽  
Hf Isotope ◽  
Equatorial Atlantic ◽  
Volcanic Province

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
Sign in / Sign up

Export Citation Format

Share Document