CHE SIGNIFICA PHENOCRYST IN INGLESE
phenocryst
Una fenocristina è un cristallo relativamente grande e di solito cospicua, distintamente più grande dei granelli della massa rocciosa di una roccia ignea. Tali rocce che hanno una differenza distinta nella dimensione dei cristalli sono detti porfidi, e l'aggettivo porfirico viene usato per descriverli. I fenocristi hanno spesso forme eurodiche, sia a causa della crescita precoce all'interno di un magma, sia mediante la ricristallizzazione post-emplacement. Normalmente il termine fenocryst non viene utilizzato a meno che i cristalli siano direttamente osservabili, a volte indicati come diametri superiori a 5 millimetri. I fenocristi al di sotto di questo livello, ma ancora più grandi dei cristalli del terreno, sono chiamati microfenocristalli. I fenocristi molto grandi sono chiamati megaphenocrysts. Alcune rocce contengono sia microfenocristalli che megaphenocrysts. Nelle rocce metamorfiche, i cristalli simili a fenocristi sono chiamati porfiroblasti. I fenocristi si trovano più spesso nelle rocce ignee più leggere come i felini e gli andesiti, anche se si verificano in tutto lo spettro igneo, compresi gli ultramafics. I più grandi cristalli trovati in alcune pegmatite sono spesso fenocristalli essendo significativamente più grandi degli altri minerali.
definizione di phenocryst nel dizionario inglese
La definizione di fenocristo nel dizionario è uno dei numerosi cristalli di grandi dimensioni che sono incorporati in una massa di cristalli più piccoli in rocce ignee come il porfido.
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10 LIBRI IN INGLESE ASSOCIATI CON «PHENOCRYST»
Scopri l'uso di
phenocryst nella seguente selezione bibliografica. Libri associati con
phenocryst e piccoli estratti per contestualizzare il loro uso nella letteratura.
1
Phenocryst and Glass Microprobe Analyses for the 29.5 Ma Wah ...
Robert L. Nusbaum. UNIVERSITY OF NEVADA RENO INTRODUCTION This
manscript contains microprobe data for Wah Wah Springs. Nevada Bureau of
Mines and Geology University of Nevada Reno Reno. Nevada 89557-0088 (702)
...
2
Arc Volcano of Japan: Generation of Continental Crust from ...
Generation of Continental Crust from the Mantle Takeru Yanagi. The grain size of
a phenocryst was expressed by a harmonic mean of lengths of its long side and
short side. The maximum size of phenocrysts of a mineral was expressed by the ...
3
Mesozoic to Cenozoic alkaline magmatism in the brazilian ...
Piero Comin-Chiaramonti. to Wo Augite to Wo t Augite to Wo Augite to Wo t A Hd
Aimite to Wo Augite to Wo ATM Di A Augite Hd ,40 to Wo Augite • Katungite -
Amorinopolis Mafurite - Aguas Emendadas (phenocryst rim/groundmass) D
Mafurite ...
Piero Comin-Chiaramonti,
2005
4
Geological Survey Professional Paper
Resorbed oval phenocryst on far left (PI) contains coarse, devitrified melt
inclusions. Most inclusions are parallel to or bounded by polysynthetic twin
planes. Euhedral grain at upper center (Pz) has a zone of fine interconnected
devitrified melt ...
Geological Survey (U.S.),
1986
5
Sixth Hutton Symposium on the Origin of Granites and Related ...
of phenocrysts structures of dominant phenocryst populations (oscillatory zoning
is not shown) Eastern Erzgebirge Eastern Erzgebirge granodiorite, volcano-
plutonic monzogranite, complex rhyodacite, rhyolite Western Erzgebirge
Eibenstock ...
6
United States Geological Survey Professional Paper
As a phenocryst plagioclase occurs usually in stout crystals with sharply
developed faces and rather numerous crystal forms, such as have been
repeatedly described as characteristic of andesites in general. The most
prominently developed ...
7
Igneous Petrogenesis A Global Tectonic Approach
pig AF fspth Figure 6.24 Major phenocryst mineralogy of the low-K or island-arc
tholeiite series. Figure 6.25 Major phenocryst mineralogy of the island-arc calc-
alkaline series. lesser extent, amphibole and biotite) tend to be relatively Mg-rich
...
8
Plates, Plumes, and Planetary Processes
Establishment of the composition of the most-magnesian olivine phenocryst or
microphenocryst for the suite, as a target for the olivine addition calculations. In
any magma suite, there will be found a range in olivine phenocryst compositions,
...
Gillian R. Foulger, Donna M. Jurdy,
2007
Ewart's (1976) recent compilation of modal data for about 780 basalt and
andesite lavas from the calcic and calc-alkalic arc systems shows phenocryst
contents of as much as 60% by volume, but only about 8% of the samples contain
more ...
Charles Edward Chapin, Wolfgang E. Elston,
1979
10
Intra-oceanic Subduction Systems: Tectonic and Magmatic ...
First, smooth major and trace element composition trends, which typify the
tholeiitic series, are successfully modelled by simple fractional crystallization of
phenocryst phases (Fig. 6). Secondly, composition of the phenocryst phases
change ...
Robert D. Larter, Philip T. Leat, Geological Society of London,
2003
7 NOTIZIE DOVE SI INCLUDE IL TERMINE «PHENOCRYST»
Vedi di che si parla nei media nazionali e internazionali e come viene utilizzato il termine ino
phenocryst nel contesto delle seguenti notizie.
Journal Highlight: Towards a protocol for the trace element analysis …
Additionally, larger ablation craters (50 µm diameter) potentially incorporate even small volumes of phenocryst material, whereas smaller ... «spectroscopyNOW.com, ott 14»
Tanzanian Royalty Announces Grade Control Drilling Results for …
The dykes are typically pink in colour and posses both quartz and feldspar phenocryst phases in a fine-grained ground mass. The target area ... «Marketwired, set 14»
GSA Bulletin: Rock avalanches, ancient weather, astronomical …
... rock geochemistry, 40Ar/39Ar geochronology, and oxygen isotope data indicate that at least 500 cubic kilometers of primarily phenocryst-rich ... «Science Codex, apr 14»
Photo Release -- Santo Mining Signs Definitive Agreement to …
There are areas of highly silicified breccias, quartz fragments and spilite phenocryst. In the Rio Cazones you can observe outcrops of course ... «GlobeNewswire, apr 13»
Unravelling a Volcano Using Crystals Under a Microscope
You might notice a scale bar below the crystal – that is 200 micrometers, so some of the microlites are pretty small while the phenocryst is pretty ... «Wired News, dic 11»
The Ladies Fashion Of Fallout 3
Fashion based on Fallout 3? May sound a little dirty – and it is – but some people like it dirty. Etsy craftster phenocryst has a range of jewellery ... «Kotaku Australia, lug 10»
Nuka-Cola Accessories: Post-Apocalyptic Fashion
All of these items – and more, including baby Metroids in a jar – are available at Phenocryst Miniatures' Etsy shop. Remember, even if your ... «Technabob, lug 10»