نتایج جستجو برای: petrography
تعداد نتایج: 1284 فیلتر نتایج به سال:
Abstract in English The granite of Abeokuta is part the Older Granite suite basement complex southwestern Nigeria. Field observation has identified as porphyritic texture, with a preferred alignment megacrysts K-feldspar >5 cm that are mostly euhedral to subhedral shape. predominantly yellowish, but whitish and pinkish colouration also been observed. dark grey porphyritic, mafic rock composi...
In Astaneh area (southwest Arak), in the contact with rhyodacitic subvolcanic rocks xenoliths with pyroxene- hornfels mineralogical composition have formed. These rocks have mineral paragenesis including corundum + spinel + andalusite + K-feldspar + plagioclase+ muscovite + biotite and chlorite with granoblastic, lpydoporphyroblastic, porphyrolpydoblastic, symplectite and poikiloblastic texture...
CHONDRITE PARENT BODY. A. Wittmann, J. R. Weirich, T. D. Swindle, D. Rumble III, and D. A. Kring Lunar & Planetary Institute, Houston, TX. 77058, [email protected], [email protected], Lunar & Planetary Laboratory, University of Arizona, Tucson, AZ 85721, [email protected], [email protected]. Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, drumb...
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