Petrogenesis and tectonic setting of Shakha Rash granitoid, Bulfat intrusive complex, northeastern Iraq

Zrary, Mohammed M.; Aqrawi, Ahmed M.; Elias, Elias M.

doi:10.1007/s12517-022-10439-1

Cited by 1 publication

(2 citation statements)

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“…On the Or-An-Ab diagram (Figure 8b), they fall within the trondhjemite field. The variations observed in the major oxide compositions among the felsic rocks in the studied samples can generally be attributed to different tectonomagmatic processes that underlie the origin of the leucosome and feldspathic granite dikes within the Bulfat group [19,20].…”

Section: Felsic Rocksmentioning

confidence: 92%

“…The Bulfat Igneous Complex has attracted the interest of geologists and the different parts of the complex have been studied extensively [6][7][8][9][10][11][12][13][16][17][18][19][20]. The presence of intraoceanic arcs within the Neotethys Ocean during the Eocene, as indicated by the Walash and Bulfat groups in Iraq, prior to the collision of the Arabian and Iranian continental plates, remains a topic of ongoing discussion.…”

Section: Introductionmentioning

confidence: 99%

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Late Cretaceous-Paleocene Arc and Back-Arc System in the Neotethys Ocean, Zagros Suture Zone

Mohammad,

Abdulla,

Azizi

2023

Minerals

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The Bulfat Igneous Complex comprises the Bulfat and Walash groups and is situated in the Zagros Suture Zone, in the junction of Arabian and Eurasian plates. Zircon U-Pb data indicat an age of 63.7 ± 1.5 Ma for the trondhjemite rocks within the Bulfat group. Walash group is primarily composed of basalt to andesite rocks, interbedded with sedimentary rocks. Zircon U-Pb dating yields an age of 69.7 ± 2.7 Ma for the Walash group. Whole rocks chemistry shows that the Bulfat rocks have affinity to MORB and calc alkaline series but Walsh are mainly plot in the calc alkaline field. Whole rocks Sr-Nd isotope ratios show that the 143Nd/144Nd (i) changes from 0.51243 to 0.52189 and 87Sr/86Sr(i) ratios vary from 0.70345 to 0.7086. The calculated εNd(t) values, based on the CHUR, yield predominantly high positive values ranging from +6 to +8 for most samples. However, a few samples exhibit lower values (+2 to +3). Our data suggest that the interaction between lithospheric (depleted mantle, MORB-Like) and asthenospheric mantle (OIB-like) melts significantly controlled the magmatic evolution of the Bulfat group. The strong positive εNd(t) values (ranging from +6 to +8) align more consistently with a highly depleted lithospheric mantle source for the Walsh group. Therefore, the gradual transition from an arc signature at 70 Ma to a MORB signature around 63 Ma, occurred over a relatively short period of about 10 million years, and indicates the presence of an arc and back-arc system in the Neotethys ocean before the collision of the Arabian and Iran plates during the Cenozoic.

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Section: Felsic Rocksmentioning

confidence: 92%