http://digicon.athabascau.ca/cdm/ref/collection/RM/id/132 WebIn a general sense, it is the intermediate type between silica -poor basalt and silica-rich rhyolite. It is fine-grained ( aphanitic) to porphyritic in texture, and is composed predominantly of sodium-rich plagioclase plus pyroxene or hornblende. [2] Andesite is the extrusive equivalent of plutonic diorite.
Petrogenetic and geodynamic evolution of plutonic rocks from the ...
Web29 mei 2024 · Is hornblende intrusive or extrusive? Diorite. Diorite is an intrusive igneous rock composed principally of the silicate minerals plagioclase feldspar (typically andesine), biotite, hornblende, and/or pyroxene. The chemical composition of diorite is intermediate between gabbro and granite. What type of rock is hornblende porphyry? Web岩浆岩 纯橄模 Dunite 正长斑岩 Syenite-porphyry(02) 珍珠 Pearlstone(071) 辉石徽楼岩 Pyroxene peridotite 黑曜岩 Obsidian(070 蛋酸岩 Carbonatite157) 茂石正长岩 Nepheline syenite12 松脂岩 Pitchstone(079) 辉长岩 Gabbro(030) 白檳石咱岩 Leucophonolite110 罪细岩 Felsite(073) 斜长岩 Plagioclasite(022 ... fort sam houston cys
Quartz monzonite - Wikipedia
Web2 sep. 2024 · Porphyritic basalt has the same composition and mineralogy except for larger crystals of hornblende, augite, olivine, and plagioclase feldspar (calcium-rich) in a fine-grained groundmass. 5. Pitchstone porphyry. Pitchstone porphyry or vitrophyre is a volcanic glass groundmass rock with large crystals of plagioclase, quartz, or feldspar … Web23 feb. 2024 · Early Porphyry One is followed by an intermineral plagioclase hornblende porphyry with a radiometric age of 15.6Ma (±0.1Ma). This unit represents a cooling of … WebA coarse grained diorite with prominent porphyritic hornblende in a sodic plagioclase-rich matrix, the plutonic equivalent of spessartite (lamprophyre). Classification of Hornblende … dino ranch birthday party supplies