Timing and sources of granite magmatism in the Ribeira Belt, SE Brazil: Insights from zircon in situ U–Pb dating and Hf isotope geochemistry in granites from the São Roque Domain

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.

Download Full-text

Zircon U-Pb geochronology and Sr–Nd–Pb–Hf isotope geochemistry for Permian–Early Triassic arc-related magmatism in Pohang, Jangsari, and Yeongdeok, southeastern Korean Peninsula

Lithos ◽

10.1016/j.lithos.2020.105930 ◽

2021 ◽

Vol 382-383 ◽

pp. 105930

Author(s):

Hyun-Ok Choi ◽

Sung Hi Choi ◽

Seung-Sep Kim

Keyword(s):

Korean Peninsula ◽

Isotope Geochemistry ◽

Hf Isotope ◽

Early Triassic

Download Full-text

The Lu-Hf isotope geochemistry of chondrites and the evolution of the mantle-crust system

Earth and Planetary Science Letters ◽

10.1016/s0012-821x(97)00040-x ◽

1997 ◽

Vol 148 (1-2) ◽

pp. 243-258 ◽

Cited By ~ 2119

Author(s):

Janne Blichert-Toft ◽

Francis Albarède

Keyword(s):

Isotope Geochemistry ◽

Hf Isotope

Download Full-text

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 ◽

10.3390/min10110936 ◽

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.

Download Full-text