Monazite and cassiterite Usingle bondPb dating of the Abu Dabbab rare-metal granite, Egypt: Late Cryogenian metalliferous granite magmatism in the Arabian-Nubian Shield
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Abstract
The Abu Dabbab rare-metal granite in the Eastern Desert of Egypt is a highly-evolved alkali-feldspar granite with transitional magmatic-hydrothermal features. Extreme geochemical fractionation and the associated significant Ta
Sn resource make the Abu Dabbab intrusion an important feature in the metallogenic evolution of the Arabian-Nubian Shield. UPb dating by laser ablation sector field (SF)-ICPMS analysis of igneous monazite yields a Concordia age of 644.7 ± 2.3 Ma, identical within uncertainty to a lower intercept Tera-Wasserburg isochron age of 644.2 ± 2.3 Ma obtained from hydrothermal cassiterite. Both ages place tight constraints on the timing of magmatic-hydrothermal processes in the Abu Dabbab granite which represents the oldest highly-evolved granite recognized so far in the Pan-African Arabian-Nubian Shield. Thus, the new ages also date the start of a period of late-orogenic metalliferous granite magmatism, when the basement of the Eastern Desert underwent a geodynamic transition from a compressive subduction-collision regime towards orogenic collapse in the late Cryogenian.
Suggested Citation
Lehmann, B., Zoheir, B., Neymark, L., Zeh, A., Emam, A., Radwan, A., Zhang, R., Moscati, R.J., 2020, Monazite and cassiterite Usingle bondPb dating of the Abu Dabbab rare-metal granite, Egypt: Late Cryogenian metalliferous granite magmatism in the Arabian-Nubian Shield: Gondwana Research, v. 84, p. 71-80, https://doi.org/10.1016/j.gr.2020.03.001.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Monazite and cassiterite Usingle bondPb dating of the Abu Dabbab rare-metal granite, Egypt: Late Cryogenian metalliferous granite magmatism in the Arabian-Nubian Shield |
| Series title | Gondwana Research |
| DOI | 10.1016/j.gr.2020.03.001 |
| Volume | 84 |
| Year Published | 2020 |
| Language | English |
| Publisher | Elsevier |
| Contributing office(s) | Central Mineral and Environmental Resources Science Center, Crustal Geophysics and Geochemistry Science Center, Geology, Geophysics, and Geochemistry Science Center |
| Description | 10 p. |
| First page | 71 |
| Last page | 80 |
| Country | Egypt |