SHRIMP U–Pb zircon analyses also reveal that the post-tectonic porphyritic monzogranites and granites in the Jiao-Liao-Ji belt were emplaced at 1875 ± ± 31 Ma, respectively, simultaneously with the emplacement of the alkaline syenites that was dated at 1857 ± ± 23 Ma.
Similar post-tecotnic or anorogenic granites are not only limited to the Jiao-Liao-Ji belt, but are also found in the North and South Korea, suggesting that the ∼1.85 Ga post-tectonic or anorogenic granitic magmatic event may have occurred in both the Korean Peninsula and the Eastern Block of the North China Craton.
The Paleoproterozoic Jiao-Liao-Ji belt lies at the eastern margin of the Eastern Block of the North China Craton and is composed mainly of the Liaohe Group and the Liaoji granitoids.
The Liaoji granitoids are divisible into pre-tectonic magnetite and hornblende/biotite monzogranitic gneisses and post-tectonic or anorogenic porphyritic monzogranites and alkaline syenites.
It occurs as thin banded layers within meta-arkosic sandstone, formed by alternating processes of chemical (hydrothermal) and detrital depositions under a shallow marine environment.
It mainly consists of alternating layers of iron oxides, mostly hematite, and quartz.
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The Palaeoproterozoic U-Pb zircon age may be correlated with the Khida terrane(1800-1650 Ma), in the north-westernmost portion of the ''Arabian Craton'' in Saudi Arabia.The cathodoluminescence (CL) imagesshow no evidence of the zircon growth during Tertiary magmatism.The rims arewide and darker in CL compared to the cores.Here, a thinned Palaeoproterozoic continental basement fragment in Neo-Tethys might have contaminated the upwelling calc-alkaline magma beforeerupting.Keywords: SHRIMP U-P, Zagros, Iraq, Walash, Naopurdan.