10 LIBRI IN INGLESE ASSOCIATI CON «PORPHYROID»
Scopri l'uso di
porphyroid nella seguente selezione bibliografica. Libri associati con
porphyroid e piccoli estratti per contestualizzare il loro uso nella letteratura.
1
Geothermal Energy in Europe: The Soultz Hot Dry Rock Project
The type 2 cuttings may be considered to represent the biotite porphyroid granite
which has undergone a very prominent hematization of K-feldspar megacryst (
purplish colored cutting samples). We term it hematised, porphyroid biotite
granite.
2
The Continental Permain in Central, West, and South Europe: ...
In some places similar schists are found above the upper layer of "Nair-
porphyroid" as well. But normally, 1O metres of sericite schists, which contain
pebbles of "Nair-porphyroid", follow above the upper "Nair-porphyroid". Their
lower boundary ...
3
The Evolution of the Rheic Ocean: From Avalonian-Cadomian ...
o metatrachyte C14.15 A metatrachyte SWIE4 V metatrachyte LA2 ♢ rhyodacite
N20A • rhyodacite OK9.8 Th Nb Ta La Ce Sr Nd Zr Hf Sm Eu Ti Gd Tb Dy Y Er Tm
Yb + orthogneiss FR25 X orthogneiss FR26 * orthogneiss Fr27 o porphyroid ...
4
Magnetic Fabric: Methods and Applications
Microgranular enclaves are porphyroid or equigranular and medium- to fine-
grained amphibole-biotite mon- zonite, syenites or monzodiorites. Contact
between Units 1 and 2 are almost everywhere sharp, with some discontinuous
fine-grained ...
Fatima Martín-Hernández, Geological Society of London, 2004
5
Economic Geology of Gilpin County and Adjacent Parts of ...
Noteworthy features of this rock are the coarsely porphyroid texture, the presence
of primary hornblende to the complete exclusion of biotite, which is an abundant
constituent of most of the associated rocks, and the large percentage of ...
Edson Sunderland Bastin, James Madison Hill, 1917
6
U.S. Geological Survey Professional Paper
The abundant phenocrysts, originally pyroxene, as shown by their form, are now
an aggregate of chlorite, calcite, and magnetite. Nonporphyritic quartz
monzonites. — Many of the quartz monzonites are porphyroid to massive in fabric
and ...
7
Professional paper - United States Geological Survey
In thin section the gneissoid character is less conspicuous, the rock having a
seriate porphyroid fabric In which the Individual crystals average about 1
millimeter in the longest direction, although the quartz crystals may be as much
as 4 ...
Geological Survey (U.S.), 1917
8
Mine Planning and Equipment Selection 1995
... important hard dimension stone quarrying districts in Italy: Sardinia (granites).
Luserna-Bagnolo (gneisses), Ossola (granites and gneisses), Bergamo (
schistose porphyroid), Trento (Palaeozoic ignirabrite, commercially known as
porphyry).
J. Hadjigeorgiou, A.K. Mehmotra, R. Poulin, 1995
9
The Geology of Belgium and the French Ardennes
The ordinary slate above it passes down to a paler, more ashy-looking rock, the
separation of which from the porphyroid is marked, but I did not see any distinct
signs of an ordinary igneous junction. Below the porphyroid is a grey, schisty rock
, ...
Geologists' Association, Jules Auguste Alexandre Gosselet, 1885
10
Proceedings of the Geologists' Association
1902 Excursion. From this point to Swannymote there extends another
porphyroid described by Prof. Watts as the glassy porphyroid. Adjoining this
porphyroid, two different rocks, not hitherto described on the Association
excursions, were ...
