Blastoporphyritic texture
Webblastoporphyritic texture defined by antiperthitic plagioclase phenocrysts set in a well recrystallized fine-grained mosaic of Fe-rich orthopyroxene Fe-rich … Webprefix sometimes appended before a protolith fabric, such as blastoporphyritic. The use of "blasto" as a prefix is discourage. Use this word instead: relict. ... texture in which …
Blastoporphyritic texture
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Web• augen structure: containing eye-shaped strained relict feldspar phenocrysts • relict: any texture or mineral inherited from the protolith (e.g., “relict K-feldspar phenocrysts”, or “relict cross-bedding”) • blastoporphyritic: relict porphyritic texture • migmatite: mixture of igneous and metamorphic rocks due to partial melting Webrelic textures - Recrystallization under hydrostatic conditions yielding a newly imposed granoblastic fabric - Increase in grain size without changes in chemistry or ... Blastoporphyritic. Inherited from porphyritic igneous rock. Blasto-ophitic. Inherited from ophitic gabbro. Blastopsammitic. Inherited from sedimentary rock.
Web(g) Porphyritic texture granite porphyry. The phenocrysts are semiautomorphic or elongated grains, the quartz is corroded, and the matrix is microscopic granular plagioclase–quartz. … WebThe use of blastos as a suffix in “porphyroblast” must be contrasted with its use as a prefix in “blastoporphyritic,” which refers to a relict texture produced by the partial metamorphic modification of a porphyritic texture, the large crystals being relict igneous and not metamorphic. Rarely, and confusingly, pseudophenocryst and ...
WebBased on chemical composition, texture, and other criteria such as isotopic… Glomeroporphyritic texture geology Britannica Other articles where glomeroporphyritic … http://www.npshistory.com/publications/geology/state/ca/cdm-sr-53/sec1.htm
Webmosaic or blastoporphyritic texture. Black pyroxenite veins are popular in Qiaoshan xenoliths, which are difficult to be distinguished from the host basalts in hand specimen. The pyroxenite veins are mainly consisted of black clinopyrox-ene. These clinopyroxenes contain many oxide minerals with magmatic origin, which indicate that the pyroxenite
WebStudy with Quizlet and memorize flashcards containing terms like Where do met texture come from?, Granoblastic texture, hornfelsic texture and more. ... Blastoporphyritic. where the larger grains are relic phenocrysts of an igneous protolith. Sets with similar terms. Geology Mineral Quiz 2. 24 terms. ymcmb100. Igneous rocks (1-30) field training serviceshttp://www.ichacha.net/斜方晶结构.html field tech analystWebJan 10, 2024 · Metamorphic Textures. More info. Download. Save. Metamorphi c textu res: Identifica tion of meta morphic rock s depends on miner al compositi on and te xtures. There for e under sta nding metamor phic te xture is import ant: T extur e: r ef ers t o: 1) The shape and siz e of individual gr ains. fieldclass flowfieldWeb4. Blastoporphyritic texture. In the image, the garnets are clearly much larger than the surrounding grains, which indicates some kind of inequigranular texture. The hornblende around the garnet indicates a reaction taking place, possibly due … field view care home mapplewell barnsleyWebNov 1, 2024 · The blastoporphyritic texture is formed by randomly distributed and randomly oriented mafic porphyroblasts (Fig. 6 A), comprising fine-to medium-grained … field test of bricksWebpink and light greenish-gray, with a blastoporphyritic texture consisting of relict phenocrysts of quartz up to 3.0 mm in diameter in a very fine grained xenoblastic aggregate of quartz, albite and microcline with accessory biotite and white mica. Foliation, weak and defined by faint compositional banding field\\u0026main modern craftingWebThe lack of deformation in contact metamorphism is favorable for the preservation of relict( palimpsest) textures, which are named by using “blasto” as a prefix to the name of the texture preserved: e.g., … field visits it maintenance