27 research outputs found
Detrital apatite Lu-Hf and U-Pb geochronology applied to the southwestern Siberian margin
First published: 03 February 2022Apatite is increasingly used in sedimentary provenance studies. However, detrital apatite UâPb geochronology can be challenging due to the presence of non-radiogenic Pb, its intermediate closure temperature (~350â550°C) and/or age-resetting by metamorphic/metasomatic processes. The LuâHf system in apatite has a higher closure temperature (~675â750°C) and is, therefore, more robust to thermal resetting. Here we present the first detrital apatite LuâHf age spectra. We have developed a laserablation LuâHf dating technique, using reaction-cell mass spectrometry, that allows rapid cost-effective analysis, required for detrital apatite studies. The method is best suited to Precambrian detritus, permitting greater radiogenic Hf ingrowth. Using samples from Siberia, we demonstrate: (1) excellent correlations between UâPb and Luâ Hf dates for apatites from igneous protoliths; and (2) that LuâHf dating can detect primary age information in metamorphic grains. Hence, when used in tandem with UâPb zircon and apatite geochronology, LuâHf apatite dating provides a powerful new tool for provenance studies.Stijn Glorie, Jack Gillespie, Alexander Simpson, Sarah Gilbert, Andrei Khudoley, Nadezhda Priyatkina, Martin Hand, Christopher L. Kirklan
Paleogene Foredeep Basin Deposits of North-Central Cuba: A Record of Arc-Continent Collision between the Caribbean and North American Plates
New data on the basement of Franz Josef Land, Arctic region
We have studied pebbles of igneous rocks from the Lower Jurassic sedimentary succession of Hall Island, Franz Josef Land. Pebbles are represented by felsic intrusive and extrusive rocks, often cataclased and greisenized. The UâPb age of crystallization for zircons of the studied samples yielded the Latest DevonianâEarly Carboniferous and EarlyâMiddle Permian ages. In addition, the studied zircons demonstrate a broad scatter of ages, from Middle Paleozoic to Mesozoic, suggesting repeated thermal reworking and metamorphism of granites. It is shown that coeval Late Paleozoic magmatism indicates the similarity of the geological evolution of the northern Barents Sea and the Severnaya Zemlya archipelago.</p
Constraining Age of Deformation Stages in the South-Western Part of Verkhoyansk Fold-and-Thrust Belt by Apatite and Zircon Fission-Track Analysis
New data on the basement of Franz Josef Land, Arctic region
We have studied pebbles of igneous rocks from the Lower Jurassic sedimentary succession of Hall Island, Franz Josef Land. Pebbles are represented by felsic intrusive and extrusive rocks, often cataclased and greisenized. The UâPb age of crystallization for zircons of the studied samples yielded the Latest DevonianâEarly Carboniferous and EarlyâMiddle Permian ages. In addition, the studied zircons demonstrate a broad scatter of ages, from Middle Paleozoic to Mesozoic, suggesting repeated thermal reworking and metamorphism of granites. It is shown that coeval Late Paleozoic magmatism indicates the similarity of the geological evolution of the northern Barents Sea and the Severnaya Zemlya archipelago.</p
New data on the age and protolith of granulites of the Olkhon collisional system (Baikal Region)
Transgenic Expression of Walleye Dermal Sarcoma Virus rv-cyclin Gene in Zebrafish and Its Suppressive Effect on Liver Tumor Development After Carcinogen Treatment
10.1007/s10126-009-9251-9Marine Biotechnology126640-649MABI