نتایج جستجو برای: hornblende gabbro
تعداد نتایج: 1000 فیلتر نتایج به سال:
The Mishu garnitoidic complex is cropped out in NW of Mishu mountains, in southwest of Marand, northwest Iran (East Azarbaidjan) which is intruded into Kahar Formation. Based on petrographic studies, this pluton is composed of intermediate rocks including granodiorite, quartzmonzodiorite and diorite. Plutonic rocks are mainly composed of quartz, plagioclase, orthoclase, biotite, amphibole and p...
The conventional K-Ar dating method was applied to the 1986 dacite flow from the new lava dome at Mount St. Helens, Washington. Porphyritic dacite which solidified on the surface of the lava dome in 1986 gives a whole rock K-Ar “age” of 0.35±0.05 million years (Ma). Mineral concentrates from the dacite which formed ins 1986 give K-Ar “ages” from 0.34±0.06 Ma (feldspar-glass concentrate) to 2.8±...
The amphibolitic xenoliths are the most aboundant xenoliths in the Markouh dacitic dome northeast of Birjand. The Markouh dacite is composed of plagioclase, quartz, green hornblende, biotite, magnetite and amphibolitic xenoliths that are contaning brown- green hornblende, plagioclase ± biotite ± quartz ± pyroxene. Determination of temperature and pressure of these rocks, based on Al content in ...
The Kızıldağ (Hatay) ophiolite in southern Turkey represents a complete, although fault-dissected, remnant of oceanic lithosphere that formed within the South Tethyan ocean during late Cretaceous. forms part Upper Cretaceous belt which includes Troodos (Cyprus), Baer-Bassit (Syria), Amanos (S Tukey), S Iran and Semail (Oman) ophiolites. Ion-probe (SIMS) dating seven samples crustal rocks (cumul...
Melt inclusions with large, positive Sr anomalies have been described in multiple tectonic settings, and the origins of this unusual geochemical feature are debated. Three proposed, all involving plagioclase as source elevated Sr: (i) direct assimilation plagioclase-rich lithologies, (ii) recycled lower oceanic gabbro mantle source, (iii) shallow-level diffusive interaction between present day ...
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