首页|Potassium isotopes trace the formation of juvenile continental crust

Potassium isotopes trace the formation of juvenile continental crust

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Constraining the processes associated with the formation of new(juvenile)continental crust from mantle-derived(basaltic)sources is key to understanding the origin and evolution of Earth's landmasses.Here we present high-precision measurements of stable isotopes of potassium(K)from Earth's most voluminous plagiogranites,exposed near El-Shadli in the Eastern Desert of Egypt.These plagiogranites exhibit a wide range of 641 K values(-0.31‰±0.06‰ to 0.36‰±0.05‰;2 SE,standard error)that are significantly higher(isotopically heavier)than mantle values(-0.42‰±0.08‰).Isotopic(87Sr/86Sr and 143Nd/144Nd)and trace element data indicate that the large variation in δ41K was inherited from the basaltic source rocks of the El-Shadli plagiogranites,consistent with an origin through partial melting of hydrothermally-altered mid-to-lower oceanic crust.These data demonstrate that K isotopes have the potential to better constrain the source of granitoid rocks and thus the secular evolution of the con-tinental crust.

Potassium isotopesPlagiogranitesArabian-Nubian ShieldNeoproterozoicCrustal growth

Hamed Gamaleldien、Kun Wang、Tim E.Johnson、Jian-Feng Ma、Mohamed Abu Anbar、Xinmu J.Zhang、Hugo K.H.Olierook、Christopher L.Kirkland

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Department of Earth Sciences,College of Engineering and Physical Sciences,Khalifa University,Abu Dhabi,United Arab Emirates

School of Earth and Planetary Sciences,Curtin University,GPO Box U1987,Perth,WA 6845,Australia

Department of Earth,Environmental,and Planetary Sciences and McDonnell Center for the Space Sciences,Washington University in St.Louis,MO 63130,USA

Timescales of Mineral Systems Group,School of Earth and Planetary Sciences & John de Laeter Centre,Curtin University,Australia

Key Laboratory of Mineralogy and Metallogeny,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,China

Geology Department,Faculty of Science,Tanta University,31527 Tanta,Egypt

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2024

10.1016/j.gsf.2024.101882

地学前缘(英文版)
中国地质大学（北京） 北京大学

地学前缘(英文版)

CSTPCD
影响因子：0.576
ISSN：1674-9871
年,卷(期)：2024.15(6)