Geodynamic record of Rodinia breakup to Gondwana formation: Insights from bulk geochemistry, whole-rock Sr-Nd isotopes, and zircon U-Pb-Hf data of Katherina Ring Complex, Sinai Peninsula, Egypt

Abstract

The Arabian-Nubian Shield (ANS) serves as a key geological archive, preserving the tectono-thermal evolution associated with the Rodinia breakup (~900-800 Ma) and Gondwana formation (~800-620 Ma). The Katherina Ring Complex (KRC), located in the Sinai Peninsula, Egypt (northern ANS), exemplifies continental growth through multistage magmatism and orogenesis, spanning the Tonian to Ediacaran periods (~900-530 Ma). Despite its importance, debates persist regarding the nature, age, crustal characteristics, and magma source evolution of its constituent units. Situated in the northwestern part of the KRC, the Wadi Rofaiyed Cu deposit offers an exceptional natural laboratory for investigating continental crust formation during this interval, owing to its superb exposure and preservation. This study integrates detailed fieldwork, petrographic analyses, whole-rock geochemistry, Sr-Nd isotopes, and in situ zircon U-Pb-Lu-Hf isotopic data. It aims to (i) establish a robust chronological framework for the unmetamorphosed plutonic rocks of the KRC, (ii) advance the understanding of associated geodynamic processes, and (iii) elucidate the episodic magmatism events. The findings show that Wadi Rofaiyed juvenile crust developed in four main phases: (i) a subduction-accretionary phase (~755 Ma) characterized by intense calc-alkaline magmatism, originating from the partial melting of mafic lower crust; (ii) a syn-collisional phase (~630 Ma) occurred during the collision between the Saharan metacraton and the younger ANS crust, producing I-type granitoids formed through magma mixing and crustal anatexis; (iii) a post-collisional phase characterized by intermediate I-type (~595 Ma) to felsic A-type alkaline magma (~594 Ma), originated from the partial melting of the overthickened lower crust corresponding to lithospheric delamination; and (iv) an anorogenic phase (~530 Ma) related to the final amalgamation of Greater Gondwana. Isotopic analyses across all four magmatic phases reveal low initial ⁸⁷Sr/⁸⁶Sr (0.702648-0.703311) and positive ε_Hf(t) (+2.84 to +7.78) and ε_Nd(t) (+2.61 to +5.21) values, consistent with lower crustal sources with depleted mantle-like signatures. The model ages (T_DM2) for these magmatic rocks derived from zircon Hf (1.2-1.5 Ga) and whole-rock Nd isotopes (0.96-1.17 Ga) support a predominantly juvenile crustal origin. These findings underscore the multistage tectono-magmatic evolution of the northern ANS, advancing our understanding of obduction-accretion dynamics and crustal development during the Neoproterozoic.

Keywords

Arabian-Nubian Shield / Egyptian Eastern Desert / Katherina Ring Complex / Neoproterozoic crustal evolution / Sr-Nd isotopes / Zircon U-Pb-Hf dating

CRediT authorship contribution statement

Mohamed Faisal: Writing - original draft, Validation, Software, Methodology, Investigation, Conceptualization. Huan Li: Writing -review & editing, Supervision, Project administration, Funding acquisition. Chao Sun: Writing - review & editing, Methodology. Muhammad A. Gul: Writing - review & editing, Software, Method-ology. Abdulgafar K. Amuda: Writing - review & editing. Wenbo Sun: Writing - review & editing, Software, Methodology. Jar Ullah: Writing - review & editing, Visualization, Formal analysis. Ibrahim H. Khalifa: Supervision, Conceptualization. Sara Mustafa: Writing - review & editing, Investigation, Formal analysis.

Declaration of competing interest

The authors declare that they have no known competing finan-cial interests or personal relationships that could have appeared to influence the work reported in this paper.

Acknowledgments

This study was supported by the National Natural Science Foun-dation of China (No. 92162103), the Natural Science Foundation of Hunan Province (No. 2022JJ30699, No. 2023JJ10064), and the Science and Technology Innovation Program of Hunan Province (No. 2021RC4055, No. 2022RC1182). We express gratitude to the Geology Department (Suez Canal University, Egypt) for providing logistical support during the fieldwork. The authors are indebted to Dr. Zhekai Zhou (Central South University, China) for assistance in laboratory analyses. The authors gratefully acknowledge Profes-sor Mathew Domeier for his thorough editorial handling of the manuscript. We also express our sincere appreciation to two reviewers (Prof. Karoly Nemeth and Prof. Mehmet Ali Ertürk) for their constructive comments and suggestions that significantly improved the quality of this paper.

Appendix A. Supplementary data

Supplementary data to this article can be found online at https://doi.org/10.1016/j.gsf.2025.102082.

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