Crustal Evolution of Island-Arc Ultramafic Magma: Galmoenan Pyroxenite–Dunite Plutonic Complex, Koryak Highland (Far East Russia)

Abu Hamamid Neoproterozoic Alaskan-type complex, south Eastern Desert, Egypt

“…Concentric zoning, location along deep fracture zone, the common occurrence of clinopyroxene and hornblende-rich lithologies, and the scarcity of orthopyroxene and plagioclase distinguish the AH intrusion from alpine-type and ophiolite bodies in orogenic belts and also from the stratiform layered intrusion in stable cratonic settings. These features make AH intrusion far more similar to Alaskan-type bodies, such as those found in Alaska, the Urals of Russia, and Canada (Irvine, 1974;Snoke et al, 1981;Fershtater et al, 1997;Batanova et al, 2005). Additional characteristics which support a petrologic kinship between AH intrusion and Alaskan-type complexes are: (1) the gradation from dunite to gabbros, (2) Fe +3 -and Ti-rich spinels, (3) extremely calcic composition and low Al 2 O 3 and TiO 2 contents of the clinopyroxene (4) depletion of olivine in CaO, and (5) evidence of crystal accumulation such as scarce graded layers.…”

Clinopyroxene trace element compositions of cumulate mafic rocks and basalts from the Hercynian Moroccan Central Meseta: Petrogenetic implications

“…Batanova et al, 2005;Krause et al, 2007). In particular, they share the negative Nb, Zr and Ti anomalies and the LREE-enrichment relative to the HREE.…”

Devonian magmatism associated with arc-continent collision in the northern North China Craton: Evidence from the Longwangmiao ultramafic intrusion in the Damiao area

“…12 and 13). These features suggest thatthe Longwangmiao intrusion is in some respects similarwithAlaskan-type intrusions (Irvine, 1974;Helmy and El Mahallawi, 2003;Eyuboglu et al, 2010;Ishiwatari and Ichiyama, 2004;Snoke et al, 1981;Himmelberg and Loney, 1995;Batanova et al, 2005;Johan, 2006;Deng et al, 2013).The parental magma for Alaskan-type intrusions is considered to be of picritic composition (Irvine, 1974;Tistl et al, 1994;Helmy and El Mahallawi, 2003).According to our mineralogical studies, themajor minerals (olivine, clinopyroxene and hornblende)exhibit high Mg# values in both rock types.…”