Phonolite is a fine-grained equivalent of nepheline syenite.They are products of partial melting, are silica-undersaturated, and have feldspathoids in their normative mineralogy.. Mineral assemblages in phonolite occurrences are usually abundant feldspathoids (nepheline, sodalite, hauyne, leucite and analcite) and alkali feldspar (sanidine, anorthoclase or orthoclase), and rare sodic plagioclase.
· Precambrian Research, 45 (1989) 83-95 83 Elsevier Science Publishers B.V., Amsterdam -- Printed in The Netherlands Hybridisation in Middle Proterozoic High-Level Ring Complexes, Aland, SW Finland N.P. BRANIGAN* Department of Geology, The University, Dundee DD1 4HN (Gt. Britain) (Received February 22, 1988; revision accepted November 20, 1988) Abstract Branigan, N.P., …
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This study evaluates the concept of metallogenic epochs as it applies to porphyry mineral deposits of the Canadian Cordillera, extends the study of the age of porphyry mineral deposits into northern British Columbia and the Yukon Territory, evaluates the usefulness of the fission-track dating method in determining the age and history of porphyry mineral deposits, and demonstrates the ...
· Gold is one of the most economically important metals produced. As of 1991, more than 83% of gold consumption went into jewelry, 6% was used for medals and official coins, 6% was used in electronic equipment, 2.2% was used for dental materials, and 2.8% was consumed in a variety of industrial applications.
Mount Hualalai is a basaltic cone of the Mauna Kea type, rising 8,o000o feet above the sea, consisting mainly of lava flows, but dotted with numerous small cinder cones and punctured by perhaps as many remarkable "pit craters." The cinder cones are most numerous near the summit of the mountain, and, so far as the writer is aware,
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The simple pollen cones were not more than a few centimeters in length. The root system is believed to have been shallow and extending laterally for several meters ... Late stage aplite and porphyry dykes, as well as lampro-phyre dykes cut the granite phases of the complex. Syn-plutonic mafic dykes and mafic to
· A field term for such a rock, of evident intermediate composition, could be diorite porphyry or andesite porphyry, derived from a minor intrusion or porphyritic lava flow. In thin section the rock was classified as a calc-alkaline lamprophyre with a fine-grained matrix rich in carbonate, quartz, biotite, chlorite and Fe-Ti oxides.
History Of Porphyry Stone. Porphyry has been known and used since ancient times. Important relics and monuments in porphyry have been discovered at Assyrian-Babylonian, Egyptian and Roman sites. In Roman times the red porphyry, so called for its purple-red colour (in Latin "porphyra") was a symbol of great prestige and majesty.
Older porphyry with magnetite and quartz-magnetite veins and associated biotite and. K-feldspar (potassic) alteration (1) truncated by an intermineral porphyry dyke with a. chilled margin (2); both the older porphyry and the intermineral porphyry are cut by a. bornite- …
The Red Cone complex displays characteristics of a large porphyry-type metal - system. The Climax and Henderson deposits are two of the richest molybdenum deposits in the world, and they provide clues to understanding the emplacement and zoning of the rocks at Red Cone Peak, clues that will help to understand the porphyry mineralization
Indonesia''s Wakatobi National Park protects one of the most diverse underwater environments in the world. Around 400 species of coral are found in these pristine waters, and they''re home to a staggering variety of marine life, including dolphins, whales, turtles, and hundreds of species of fish.
· Composite dykes consisting of leucominette and dacite as well as discrete dykes and flows of minette and lamproite composition, occur in the Veliki Majdan area, western Serbia. This area is part of the Serbian Tertiary magmatic province, which consists of numerous small occurrences of ultrapotassic igneous rocks. The composite dykes have leucominette margins (up to 150 cm thick) …
Dark mica-rich lampro ... 43. Plant fossils : leaves, cones, and nuts. *Photographs from U.S . Geol. Survey Prof. Paper 189-1_____ 44. Tubes made by unknown plant or animal. *Pho ... 48. Dacite porphyry. A, Photo-graph by M. E. McCal ...
28 70Illou/strioi, peri/bleptoi, lampro/tatoi were the official equivalents in Greek. Between A.D. 460 and 550 all illustres seem to have also a right to be addressed by the title of magnificus, megalopreph/j. See Koch, Die byzantinischen Beamtentitel, 51 (a book which must be used with caution). 29 Also the Comites domesticorum. 30 Also ...
Well it is certainly conical, but conical shape does not a cinder cone make. I copied the description for that area from our 1:1,000,000 scale map and pasted it below. I don''t believe this hill is or was a cinder cone. The rock debris certainly looks like basaltic rubble, but more likely to …
Cinders from cinder cones are a source of aggregate and decorative rocks. (The City of Flagstaff spreads cinders on the roads in the aftermath of snow or ice storms.) The San Francisco, Uinkaret, and Pinacate basaltic volcanic fields have hosted multiple eruption events in the past 10,000 years, and all have a high likelihood of future eruptions.
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· However, porphyry radii of similar and larger sizes have been reported by several authors, e.g. Lowell and Guilbert (1970), Tosdal and Richards (2001), Seedorff et al. (2005) and Perelló et al. (2008). The delineated porphyry mineral deposit locations mainly concentrate in the northwest of the study areas within the Rishiwa and Geshere Complexes.
Two Strong Porphyry Targets Identified by Deep Seismic Survey at Thursday''s Gossan ... nominally 3kg) were collected using a cone splitter and placed in a calico bag. The cyclone was cleaned out with compressed air at the end of each hole and periodically during …
From the foregoing brief sunssary it appears that prior to the intrusion of the stain batholith, all during Trias-sis and lever and middle Jurassic times, there mxQ* on the site and for some distance to each side of the present Coast Range batholith, a rather shallow sea which diminished in depth to-wards the north and disappeared altogether ...
Lamproites and other potassium-rich igneous rocks: a review of their occurrence, mineralogy and geochemistry
The cone sheet was later re-activated and injected a second time by porphyry that can be seen to chill against the first. Later veins of quartz and a porphyritic granophyre (a granite with a groundmass where the quartz and feldspar crystals have grown through each other) cut the cone sheet and at least one vein of aplite (a fine-grained granite ...
are developed in porphyry copper systems. The fracture system consists of joint, fault, vein and dike, which are closely related to hydrothermal activities (Heidrick and Titley, 1982). Extensive fractures are formed perpendicular to minimum principal stress. Concentric (cone-sheet) and radial fractures
diorite porphyry and quartz monzonite porphyry are younger than the quartz monzonite. During the Pliocene and Pleistocene, a surface of considerable ... some volcanic cones, intrusive plugs, and basaltic tuff, and the younger is the Sanders basalt that caps the present mesar; to the south the basalt is separated from much of the underlying ...
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Porphyry deposits are the world''s most important source of Cu and Mo, and are major sources of Au, Ag, and Sn; significant byproduct metals include Re, W, In, Pt, Pd, and Se. They account for ...
Many su lphide deposits, e.g. porphyry coppers, are overlain by oxidi zed ores. Such o res ca n be mined, if neces-sa ry, by fra cturing them by blasting and then pumping acid solutions through the rock to d issolve metal s such as copper and uranium .
The Oatman and Katherine districts have produced more than thirty million dollars worth of gold and silver yet no complete report on the geology and ore occurrence of this interesting region is available though numerous short papers on various phases of its geology or the mining operations conducted there have been published from time to time.
HOLE No. Latitiude 2100 Departure 175 Elevation 57-9 Bowring 21D Uip angle 450 Total depth 271'' Footage 0-5 42 48 5^.6 58 70 73,5 85 114 Rock CHK3GO lOHBS LIMITED
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