نتایج جستجو برای: hornblende gabbro
تعداد نتایج: 1000 فیلتر نتایج به سال:
• The gabbro was originated from metasomatized lithospheric mantle. hornblende formed mixing of asthenosphere and slab breakoff propagated eastward under the Lhasa terrane in Paleocene-Eocene. Past geodynamic events can be reconstructed using spatial temporal patterns geochemical variability igneous rocks. Here we apply this principle to define timing geometry Neo-Tethyan after India-Asia colli...
The studied bodies are located in the west of Urumieyeh Lake and northeast of Oshnavieyeh, in the Sanandaj-Sirjan structural zone. Compositionaly, these bodies are formed from gabbro-diorite (Dourbeh) and granite (Nari). Gabbrodiorite rocks are composed of plagioclase (andesine to bytownite), amphibole (calcic group and magnesio-hornblende-tschermakite-hornblende type) and pyroxene (augite) as ...
The Bazman intrusive rocks are located in northwest of Iranshahr, south of Lut block, and above of Makran subduction zone. The Bazman intrusive rocks are composed of gabbro, diorite, monzodiorite, qurtze monzodiorite, granodiorite and granite. The Composition of clinopyroxenes is in the diopside-augite range and orthopyroxenes are enstatite. The studied amphiboles are classified as calcic (magn...
Early Jurassic plutonic rocks from the Central Lhasa block that range gabbro to granite yield similar 206Pb/238U ages ranging 187.6 Ma 196.0 Ma. Gabbros and diorites are characterized by radiogenic 87Sr/86Sr(t) ratios 0.7053 0.7060, unradiogenic εNd(t) values −4.2 −2.5 εHf(t) −8.8 −2.8. Compared with intermediate mafic rocks, granites have much higher ratios, 0.7102 0.7127, lower values, −8.7 −...
The Alvand complex (Hamedan province) comprises several bodies ranging from acidic to intermediate and basic compositions intruded in the regional metamorphic sequence of the area (the Hamedan phyllites) during various magmatic episodes in Jurassic. In northern part of the complex (the Cheshmeh-ghasaban area) there are some outcrops of hornblende gabbro and olivine gabbronorite. The olivine-gab...
The Wooley Creek batholith and Slinkard pluton are adjacent plutons with identical U-Pb zircon ages of 161 +4/-2 Ma. The plutons dip toward each other, which suggests that they are connected in the subsurface. Geologic and thermochemical evidence shows that the Slinkard pluton is the structurally lowest part of the system and the Wooley Creek batholith the structurally highest, with a total str...
Basic rocks appear as cumulative hornblende gabbros in the Namen pluton, West of Sabzevar. One outcrop of these rocks contains magnetite ore patches. Although magnetite- bearing hornblende gabbro (MHG) and other hornblende gabbros (HG) have similar mineralogy, their trace element compositions are completely different. Trace element analysis of magnetite minerals by laser ablation inductively co...
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