与 «PORPHYRITIC»相关的英语书籍
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1
Fractures, Fluid Flow and Mineralization
Our observations suggest that the porphyritic andesite can be further divided into
medium grained porphyritic andesite and megaporphyritic andesite. Medium
grained porphyritic andesite. This rock type is exposed in a few deeply
weathered ...
Ken McCaffrey, Lidia Lonergan, Jamie Wilkinson,
1999
2
Origin and evolution of the Santiaguito volcanic dome ...
Rock Type Texture SiO2 TiO2 Al2O3 wt% wt% wt% SG-09-01 Santiaguito RcM1
2001-02 lavaflow 14.72055 91.57867 andesite porphyritic 61.99 ± 0.09 0.558 ±
0.007 17.45 ± 0.08 SG-09-02 Santiaguito RcM1 2001-02 lavaflow 14.72055 ...
3
Holocene and Late Pleistocene Tephra Stratigraphy of the ...
Site Unit Number Petrographic Lithology Deadman Summit 06500-D Inyo Finely
Porphyritic 06500-E Sparsely Porphyritic 06500-G Porphyritic Orthopyroxene
06500-H Porphyritic Olivine 06500-I Porphyritic Orthopyroxene 06500-J
Porphyritic ...
Charles Robert Meyn,
2007
4
Mineral Deposits at the Beginning of the 21st Century
GEOMIN Erzgebirgische Kalkwerke GmbH, Lengefeld/Erzgebirge, Germany
ABSTRACT: Formerly known as "Altenberg granite porphyry" (GP), the multiple
intrusion of dykes and subvolcanic stocks of the Upper Carboniferous porphyritic
...
5
U.S. Geological Survey Professional Paper
Quartz monzonite is the predominant rock, and is represented by two varieties —
a normally granular quartz monzonite and a porphyritic variety containing large
crystals of orthoclase. These two varieties grade into each other, but the zone of ...
6
Igneous and Metamorphic Petrology
Porphyritic. Texture. Most aphanitic rocks, many glassy rocks, and some
phaneritic rocks contain large, more or less euhedral phenocrysts embedded in a
distinctly finer-grained or glassy matrix, or groundmass. This is porphyritic texture.
7
Geology and gold mineralization of the Gold Basin-Lost Basin ...
The largest exposed body of the porphyritic monzogranite crops out east of
Hualapai Valley, nearly centered on Garnet Mountain itself. Here the porphyritic
monzogranite is the principal rock unit exposed in an area of about 60 km2.
Several ...
Ted G. Theodore, Will N. Blair, John Thomas Nash,
1987
8
Neogene-Quaternary Continental Margin Volcanism: A ...
... Cuastecomate Cuastecomate Cuastecomate Amphibole-bearing dacite lava
with porphyritic texture, aphyric enclave bearing Amphibole-bearing dacite lava
with porphyritic texture, porphyritic enclave bearing Amphibole-bearing dacite
lava ...
Claus Siebe, José Luis Macías, Gerardo J. Aguirre-Díaz,
2006
9
Great Basin and Sierra Nevada
Genesis-Blucstar mines, these dikes are locally hydrothermally- altered and
contain pyrite-arsenopyrite veinlets but are generally not ore-bearing. Porphyritic
dacite contains 20%-25% medium to coarse phenocrysts of plagioclase. biotite,
and ...
David R. Lageson, Stephen George Peters, Mary M. Lahren,
2000
10
The Origin of Chondrules and Chondrites
4.2.5 Gooding-Keil scheme Gooding and Keil (1981) divided the chondrules into
porphyritic and non- porphyritic and then described the mineralogy and texture of
the chondrule. Porphyritic chondrules are porphyritic olivine-pyroxene, ...
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Calibre Drilling Intersects 19.2 Metres Grading 223.4 g/t Silver and …
Low sulphidation epithermal gold-silver mineralization intersected in the Project gold-silver vein systems are hosted within porphyritic andesite and consists of ... «Junior Mining Network, 七月 15»
Curiosity Finds Evidence for Continental Crust on Early Mars
... compositions containing up to 67 percent SiO2 and 14 percent total alkalis (Na2O + K2O) with fine-grained to porphyritic textures on the one ... «Sci-News.com, 七月 15»
Coastal drawing is inspiration for art
... a 59-minute work that travels from the coal seams of Tyneside to the porphyritic rocks north of the River Tweed, layering instrumental sounds, ... «Northumberland Gazette, 七月 15»
AASLD Updates HCV Guidelines
... fatigue; insulin-resistant type 2 diabetes; and porphyria cutanea tarda, a porphyritic disease commonly associated with liver problems. «Gastroenterology & Endoscopy News, 七月 15»
Evrim Formally Acquires the Ball Creek Project in British Columbia
... with propylitic alteration and fracture-controlled and disseminated sulphide mineralization in both volcanic and porphyritic intrusive rocks. «MarketWatch, 六月 15»
Calibre Drilling Intersects 1.39 Metres Grading 98.72 g/t Gold and …
Low sulphidation epithermal gold-silver mineralization intersected in the Project gold-silver vein systems are hosted within porphyritic andesite ... «Stockhouse, 六月 15»
Evrim Resources sees opportunity amid struggling markets
Ardmore consists of porphyritic Proterozoic monzogranite to granite and Laramide porphyritic dykes, with zones of quartz-sericite alteration. «The Northern Miner, 六月 15»
Calibre Mining Hits 2.60m Grading 9.01 g/t Gold at Eastern Borosi …
... intersected at the Eastern Borosi Project gold-silver vein systems are hosted within porphyritic andesite and consists of structurally controlled, ... «Gold Investing News, 五月 15»
Calibre Drilling Expands High Grade Blag Gold-Silver System …
... intersected at the Eastern Borosi Project gold-silver vein systems are hosted within porphyritic andesite and consists of structurally controlled, ... «MarketWatch, 四月 15»
Lundin, Beaty bullish on Ecuador's prospects
Cangrejos' mineralization is associated with a sequence of intercalated porphyritic-dioritic intrusions and hydrothermal breccias. Gold grades ... «The Northern Miner, 四月 15»