Blastoporphyritic texture
Webblastoporphyritic texture defined by antiperthitic plagioclase phenocrysts set in a well recrystallized fine-grained mosaic of Fe-rich orthopyroxene Fe-rich clinopyroxene, ilmenite with or without fay-alitic olivine. The proportion of ferromagnesian minerals increases from anorthosite to ferrodiorite through leuconorites ... WebPorphyroclastic: a cataclastic texture characterized by the presence of large relict mineral grains set in a matrix of smaller crushed grains. Blastoporphyritic: a relict texture in a …
Blastoporphyritic texture
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WebBlastoporphyritic texture: The matrix of porphyritic igneous rocks is recrystallized, with the large grains still preserved (Fig. ... View in full-text Context 3 WebBlastoporphyritic texture A relict of porphyritic volcanic texture in metamorphic rocks - Augen texture Porphyroblast of feldspars with eye-shape cross section in fine grained gneissic matrix; 22 E- Textures donating inclusion within or rim on a porphyroblasts - Poikiloblastic or sieve texture porphyroblast
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 Webblastoporphyritic texture defined by antiperthitic plagioclase phenocrysts set in a well recrystallized fine-grained mosaic of Fe-rich orthopyroxene Fe-rich …
Webtexture, the phenocryst components are mainly quartz and K-feldspar. Strong clayization. YK10-19 CPD01 Fluidal structure, amygdaloidal structure. ... Blastoporphyritic texture. Strong clayization. Main minerals quartz and clay minerals. XPD2-1 XPD01 Blastoporphyritic texture. 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 ...
WebThe 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., …
http://www.alexstrekeisen.it/english/meta/porphyroblastic.php biography of shraddha kapoorWebblastoporphyritic. Applied to the textures of metamorphic rocks that are derived from porphyritic rocks; the porphyritic character still remains as a relict feature. Want to thank … daily declarations of faith for womenhttp://www.npshistory.com/publications/geology/state/ca/cdm-sr-53/sec1.htm daily decorWebrelic 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. daily debit card limit wells fargohttp://www.alexstrekeisen.it/english/meta/porphyroblastic.php biography of sigmund freudWebrock textures refer to small scale features in rocks that are penetrative, meaning that texture is relatively constant over the body of the specimen. Structures are large scale features that occur in hand sample, outcrops, or regionally in scale ... blastoporphyritic textre. relict igneous porphyritic texture that hasn't been changed by later ... biography of sigrid undsetWebJan 18, 2007 · North of Amphitheater Point a small amount of metadacite is present. The rock has a blastoporphyritic texture, with plagioclase, quartz, and hornblende phenocrysts. The square cross-section of the quartz phenocrysts is suggestive of a volcanic origin. Associated specimens with elastic quartz grains suggest a tuff or tuffaceous … daily decrees