Results 1 to 10 of about 42,866 (280)

Meteorite zircon constraints on the bulk Lu-Hf isotope composition and early differentiation of the Earth. [PDF]

Proc Natl Acad Sci U S A, 2015
Significance The radioactive decay of lutetium-176 to hafnium-176 has been used to study Earth’s crust−mantle differentiation that is the primary agent of the chemical and thermal evolution of the silicate Earth. Yet the data interpretation requires a well-defined hafnium isotope growth curve of the bulk Earth, which is notoriously difficult ...
Iizuka T, Yamaguchi T, Hibiya Y, Amelin Y.   +3 more
europepmc   +5 more sources

Multi-scale isotopic heterogeneity reveals a complex magmatic evolution: An example from the wallundry suite granitoids of the lachlan fold belt, Australia

Frontiers in Earth Science, 2023
Open-system magmatic processes are expected to impart various sorts of isotopic heterogeneity upon the igneous rocks they produce. The range of processes under the “open-system” umbrella (e.g., simple two-component mixing, magma mingling, assimilation ...
Kieran A. Iles, Kieran A. Iles, Janet M. Hergt, Jon D. Woodhead   +3 more
doaj   +1 more source

Zircon Hf-Isotopic Mapping Applied to the Metal Exploration of the Sanjiang Tethyan Orogenic Belt, Southwestern China

Applied Sciences, 2022
Zircon Hf-isotopic mapping can be regarded as a useful tool for evaluating the coupling relationship between lithospheric structure and metallic mineralization. Hence, this method shows important significance for mineral prediction.
Bin Du, Zian Yang, Lifei Yang, Qi Chen, Jiaxuan Zhu, Kangxing Shi, Gao Li, Lei Wang, Jia Lu   +8 more
doaj   +1 more source

Hf isotope compositions of U.S. Geological Survey reference materials [PDF]

Geochemistry, Geophysics, Geosystems, 2007
A systematic multi‐isotopic and trace element characterization of U.S. Geological Survey reference materials has been carried out at the Pacific Centre for Isotopic and Geochemical Research, University of British Columbia. Values of 176Hf/177Hf are recommended for the following reference materials (mean ±2 SD): G‐2: 0.282523 ± 6; G‐3: 0.282518 ± 1; GSP‐
Weis, D, Kieffer, B, Hanano, D, Silva, I, Barling, J, Pretorius, W, Maerschalk, C, Mattielli, N   +7 more
openaire   +2 more sources

Hf Isotope Evidence for a Miocene Change in the Kerguelen Mantle Plume Composition [PDF]

Journal of Petrology, 2002
We report high-precision multiple collector inductively coupled plasma INTRODUCTION mass spectrometry (MC-ICP-MS) analyses of Hf isotopic comSpatial and temporal isotope variations in basalts can positions for 39 Kerguelen Archipelago volcanic rocks that add a provide important constraints on the origin of the mantle new perspective to the temporal ...
Mattielli, Nadine, Weis, Dominique, Blichert-Toft, Janne, Albarède, Francis   +3 more
openaire   +3 more sources

Temporal and Hf isotope geochemical evolution of southern Finnish Lapland from 2.77 Ga to 1.76 Ga [PDF]

Bulletin of the Geological Society of Finland, 2012
The southern Finnish Lapland area in the central part of the Fennoscandian shield is a geologically complex zone comprising several Archean blocks and Paleoproterozoic supracrustal belts all of which are intruded by voluminous Paleoproterozoic granites ...
L.S. Lauri, T. Andersen, J. Räsänen, H. Juopperi   +3 more
doaj   +1 more source

Tracing Recycled Crustal Materials in the Subcontinental Lithospheric Mantle Using Thallium Isotopes

Geophysical Research Letters, 2022
Here we report the first set of thallium (Tl) isotope data in alkaline rocks from the North China Craton to constrain the nature of recycled materials in the metasomatized subcontinental lithospheric mantle.
Qing‐Feng Mei, Xinming Chen, Jin‐Hui Yang, Yu‐Sheng Zhu, Jeremy D. Owens   +4 more
doaj   +1 more source

The “zircon effect” as recorded by the chemical and Hf isotopic compositions of Lesser Antilles forearc sediments [PDF]

Earth and Planetary Science Letters, 2009
Oceanic sediments contain the products of erosion of continental crust, biologic activity and chemical precipitation. These processes create a large diversity of their chemical and isotopic compositions. Here we focus on the influence of the distance from a continental platform on the trace element and isotopic compositions of sediments deposited on ...
Carpentier, Marion, Chauvel, Catherine, Maury, René, Mattielli, Nadine   +3 more
openaire   +4 more sources

Hf isotopic compositions of the standard zircons for U-Pb dating

Chinese Science Bulletin, 2004
Using the newly published Yb isotopic abundances and the mass bias relationship between Yb and Hf, we carried out an analysis of Hf isotopes in the standard zircon 91500 by means of 193 nm laser attached to Neptune multi-collector ICP-MS (LA-MC-ICPMS).
Ping Xu, Fuyuan Wu, Liewen Xie, Yueheng Yang   +3 more
openaire   +2 more sources

Evidence for Protracted Intracrustal Reworking of Palaeoarchaean Crust in the Pilbara Craton (Mount Edgar Dome, Western Australia)

Lithosphere, 2022
~3.5-2.8 Ga granitoids from the Pilbara Craton in Western Australia are one of the most ancient and best-preserved records of early processes of continental crust generation. A number of recent studies have focused on the nature of the mantle source from
Anda Buzenchi, Hugo Moreira, Olivier Bruguier, Bruno Dhuime   +3 more
doaj   +1 more source