 | | Journal (article/letter/editorial) | | 154 THE GEOLOGY OF NORTH CORNWALL. B y HENRY DEWEY, F .G .S. , of H.~J. Ge ological Sur vey. (Read A...ROCKS J62 16 5 The Pillow-lava or Spilite -Albite-diabase-Al bite-pr ole robase or Minverite-Alteration...by Bodmin Moor, which forms the highe st land in North Cornwall. Between the Moor and the sea the surface...comprises part of the Moor and most of the hind on the north; the middle plateau is 750 ft. above sea level,...confined to its central part. THE GEOLOGY OF NORTH CORNWALL. ISS The 1,000 ft. plateau extends for |  | | Journal (article/letter/editorial) | | occur in Southern Rhenish Schiefergebirge, Western Germany. This volcanism is represented by tuffs and small...The size of these sills varies from north to south, in the north-eastern part they reach about 20 metres...Schiefergebirge between Bendorf/Neuwied on the Rhine and St. Goarhausen in the south-eastern part (Text-fig...highly altered basic rocks which could be termed diabase ". The alteration has been mostly ascribed to the...crystals and have yielded an average composition of albite-oligoclase (anorthite content varying between 8 |  | | Journal (article/letter/editorial) | | rhombohedra have been found in basalt, andesite, and diabase. It is a rare constituent of mica schists but is...specimen, Eva R. Barajas photo. Starting with North America and the United States, I was surprised to...associated quartz (fig. 2). From the Palermo No. 1 mine, North Groton, Grafton County, New Hampshire, come microcrystals...specimens to have come from Maryland (Lininger 1994). North Carolina is noted more for the goethite pseudomorphs...Foote mine), near Kings Mountain, Cleveland County, North Carolina. Siderites from Michigan include wonderful |  | | Journal (issue) | | VII, pp. 334-338 (quartz after interstices from North 1926, Proc. Acad. Nat. Sci. Phil., LXXVIII,'pp....(molds) after glauberite and anhydrite common in the diabase of this region. SCHEERER, TH., 'Ueber Pseudomorphosen...chalcopyrite, siderite and rhodochrosite after calcite, albite after adularia, aragonite after witherite, chalcopyrite...helvite "Aglaite." See albite after spodumene "Albin." See calcite after apophyllite Albite after Spodumene:...jeffersonite Apatite after Wagnerite: II, C 2 Werfen, Germany, 15177 Argentite after Silver: I, C 2 Himmelsfiirst |  | | Journal (article/letter/editorial) | | REPORT OF AN EXCURSION TO CORNWALL. NORTH APRIL 9TH TO 18TH (EASTER), 1914. PART By 1. HENRY DEWEY...splitting and trimming the slate for the market. The quarry itself was then entered, the conspicuous dip of...Tredorn Beds, by 6. The beds seen at Tintagel incline north -westwards in the following order: I, Z, 3, 4, 5...quarried in several huge excavations. At Lanterdan Quarry the chlori toid-spo tted Woolgarden phyllites are...parallel to one another, and all sloping towards the north -west. These axes are not straight lines, but ar |  | | Report (issue) | | Bishopsteignton .. ••• ••• ,, -��_;_R ailway-cutting north of Ashton Station ••• '' Page 10 •• • .... ...Lympston (N. end) ., 5.-· ,,.-. ••• •' 6.-North-west of Hayes Barton ,,,. 7.-Gravel near Langstone...connect it with the maps already described on the north and south, the district, presents in the ·Haldon...the map. . . . . The small granite tract in the north-west corner of the map is for the most pait ·above...the Haldons and to over 600 f�t on·the suinmits north of Barton, DaQcombe, and Coffinswell. East. of the |  | | Journal (article/letter/editorial) | | DIABASE AND GRANOPHYRE OF THE GOWGANDA LAKE DISTRICT, ONTARIO NORMAN L. BOWEN Massachusetts Institute...foregoingseries are intruded sills and dikes of diabase, the sill-like form being generally assumed in...Ontario which have receivedcareful study. The diabase is of remarkably uniform character in widely separated...about 12 degreesto the east. NORMAL SILL DIABASE The normal diabase of the sills is, when unaltered,a dark-gray...slide presents no difference whatever from the diabase of the Cobalt area. Biotite, black iron ores, and |  | | Journal (article/letter/editorial) | | deposits occurinterruptedly from Elk Lake on the north to South Lorraine on the south--a distanceof aroundsixty...as far southwest as the Bruce Mines area on the north shore of Lake Huron. Unlikethoseof manyof the ...near prevailinglysill-like intrusionsof quartz diabase. These sills are localizedmainly at or near the...the intrusionand completesolidificationof the diabase sills, faulting under regionalcompressirestressestook...has come from veins a short distance below the diabase sill but large areas of the upper contacthave |  | | Book | | immensely popular handbook of minerals appeared in Germany I obtained a copy fo! my personal library and was...far from a simple task because the "'Gewstones of North America. 8 artist must know minerals in order...24 feldspar; triclink Pl. 44 microcline, Fig. 8 albite. No of axes - - - --Designations Interaxial...formation of spinel twins, and lamellar twinning in albite, respectively. Twins are formed according to various...A B C D 8 Lamellar twinning illustrated in albite. (A) Triclinic axial cross with interaxial angles |  | | Book | | Carolina Biological Supply Company of Burlington, North Carolina. To those whose efforts made the use of...Aztecs, Bantus, Mayas, Mongols, New Zealand Maoris, North American Indians, Tartars. Although uncommon, some...tribal peoples: bojite (Boii, Celtic tribe in Germany), gondite (Gonds, central India), onkilonite (Onkilones...minerals (mainly quartz) alkali feldspars, including albite Anoo-os A P, pi F P/(A + P) plagioclase Anos-ioo...salts overlying rock salt deposits at Stassfurt, Germany. [G. Abraum, refuse; the salts were originally |  | | Book | | zeolite mineralogy was done, at that time, in Germany, Italy, France, and Great Britain. Because of differences...laumontite is replaced by lawsonite, and analcime by albite or jadeite. Minute zeolite crystals that form at...Lower Miocene columnar basalt in the Narre Warren Quarry, near Melbourne, Australia. The minerals are believed...1600 meters in the Ngatamariki geothermal field, North Island, New Zealand, was capped and let stand for...laumontite-albite-pumpellyite, and at the greatest depth, the greenschist facies composed of albite-prehn | | | Book | | zeolite mineralogy was done, at that time, in Germany, Italy, France, and Great Britain. Because of differences...laumontite is replaced by lawsonite, and analcime by albite or jadeite. Minute zeolite crystals that form at...Lower Miocene columnar basalt in the Narre Warren Quarry, near Melbourne, Australia. The minerals are believed...1600 meters in the Ngatamariki geothermal field, North Island, New Zealand, was capped and let stand for...laumontite-albite-pumpellyite, and at the greatest depth, the greenschist facies composed of albite-prehn |  | | Book | | Martin Meschede Laurence N. Warr The Geology of Germany A Process-Oriented Approach Regional Geology...Reviews Series editors Roland Oberhänsli, Potsdam, Germany Maarten J. de Wit, Nelson Mandela University, Port... Martin Meschede • Laurence N. Warr The Geology of Germany A Process-Oriented Approach 123 Martin Meschede...and Geology University of Greifswald Greifswald, Germany Laurence N. Warr Institute of Geography and Geology...Geology University of Greifswald Greifswald, Germany ISSN 2364-6438 ISSN 2364-6446 (electronic) Regional |  | | Journal (article/letter/editorial) | | The Harry T. Campbell Sons' Co. Gettysburg quarry looking north towards the skarnmagnetite zone. Relic sedimentary...bedding in the hornfels dips westerly. Campbell's Quarry A Complex Mineral Locality in Gettysburg, Pennsylvania...Harry T . Campbell Sons' Company crushed stone quarry, a noted Pennsyl vania mineral locality, is located...to the local ity as Teeter's quarry. Prior to 1974, the Campbell quarry was a noted zeolite suite locality...Penn sylvania Academy of Science. The Campbell quarry is in the south central por tion of a long structural |  | | Journal (article/letter/editorial) | | lies a few miles north of Cambridge on the border of the Boston Basin. A large quarry for road metal has...These include prehnite, epidote, babingtonite, albite, qu.artz,hornblende (a fibrous variely), several...MINERALOGICALSOCIETY OF AMERICA 297 in a quarry opened recently in the diabase at the foot of Mt. Tom, a few hundred...prehnite and calcite in gash veins traversing the diabase. Openings in the vein are coated with masses of...BaerxcroNrrE rRoM lJxnRrocn, Massacuusnrrs. A small quarry was openedin Uxbridge, Mass. many years since,in |  | | Journal (article/letter/editorial) | | microscopical study of the interstitial chlorite in the diabase-minverite series of south-west England. These disprove...comparatively low degree of alteration, the diabase-minverite series of North Cornwall and South Devonshire turned...minerals such as zeolites, calcite, analcite, and albite associated with it cannot be contemporaneous. Indeed...have probably crystallized a little earlier than albite, analcite, etc., and perhaps even overlap the chlorite...of chlorite from the chemical analyses of the diabase and minverite respectively. The results quoted |  | | Journal (article/letter/editorial) | | shales, and limestones of the Central Highlands. Albite-diabases represent the intrusive phase, and there...emitting keratophyres, soda-felsite, variolite, and diabase, and Thomas (34) has found a remarkable suite of...include keratophyre, soda-trachyte and soda-felsite, diabase (not DECADE V.—VOL. VIII.—NO. VI. 16 Downloaded...keratopr anite. i. Qua rtz- diabase. albitized), and basic rocks rich in albite, called skomerite and marloesite...times. They are accompanied by albite-diabase, minverite, quartz diabase, picrite, and quartz-keratophyre |  | | Journal (article/letter/editorial) | | divergent magmatic liquids, now represented by the diabase of the Palisades sill and a pyroxene trondhjemite...a Na/ K weight ratio of 75, a norm dominated by albite and quartz, and contains 0.5 wt. % each total iron...pyroxene trondhjemite contains 32 wt.% normative albite, 18 wt.% normative quartz, and 6-7 wt.% total iron...surrounding diabase, the mafic (67) and felsic (25) indices, and the position of the diabase on the AFM...section of Walker (1969). The mafic index of the diabase indicates a magma temperature of 1160°C which is |  | | Report (issue) | | Loudoun County 143 Prince William County 149 Diabase quarries of northern Virginia 155 CAPTIONS Illustrations...Ilchester, Maryland. Figure 6. Triassic diabase dike forming a ridge north of Route 7 near Dranesville, Virginia...« Serpentine variety picrolite from the Delight quarry, Delight, Maryland. Specimen is about 12 cm by...Maryland. Figure 17. Location of the Marriottsville quarry, Hernwood, Maryland. Figure 18. Marble (white)...Marriottsville quarry, Hernwood, Maryland. lii Figure 19. Location of the Greenspring quarry, Towson, Maryland |  | | Journal (article/letter/editorial) | | 1860 CONTACT-METAMORPHIC EFFECTS OF TRIASSIC DIABASE AT SAFE HARBOR, PENNSYLVANIA BY RANDOLPH W. CHAPMAN...and apophyses 194 ic t aureole 196 -pay of the diabase dike and apophyses. 197 uiphy and contact metamorphism...Safe Harbor y. Pennsylvania 192 'P^yseal dike of diabase intruding •Rs;ft dolomite 196 . vein in altered...vertical, north- zoisite. Heat was the paramount factor in the meta, trending dike of Triassic diabase transects...played a role. In the outer zone, • 'icep quarry in the diabase affords a splendid hydrothermal solutions |  | | Report (issue) | | PLATE 10. A, Polished surface of recumbent fold in albite-chlorite-muscovite-quartz schist, 7 miles northwest...northwest of Tucquan anticline; B, Fold in albite-chlorite-muscovite-quartz schist; C, Muscovite-chlorite-quartzs...Muscovite-chlorite-quartzs chist, from Muddy Creek Forks; D, Albite-muscovite-chlorite schist, from Fenmore _________...schist with quartzose lenses; B, Coarse-grained albite-chlorite-muscovite schist; C, Graphitic quartzite-... three-quarters of a mile north of Craley; B, Marburg schist, 1 mile north of Windsor; C, Marburg schist |  | | Journal (article/letter/editorial) | | Hydrotitanite from Arkansas and xanthitane from North Carolina were also analyzed.. These analyses served...shear zones in the Precambrian granitic terrane north of Lake Athabaska are more radioactive than others...and with repetitions, clear subhedtalquartz and albite, specularite, and penninite containing radioactive...about 400oC. Some of the stability relationships of albite and analcite in the system NazO-SiOz -AI2OB-HgO...The wider dikes contain tabular phenocrysts of albite, while the narrower dikes contain small feldspathic |  | | Journal (article/letter/editorial) | | Hydrotitanite from Arkansas and xanthitane from North Carolina were also analyzed.. These analyses served...shear zones in the Precambrian granitic terrane north of Lake Athabaska are more radioactive than others...and with repetitions, clear subhedtalquartz and albite, specularite, and penninite containing radioactive...about 400oC. Some of the stability relationships of albite and analcite in the system NazO-SiOz -AI2OB-HgO...The wider dikes contain tabular phenocrysts of albite, while the narrower dikes contain small feldspathic |  | | Journal (article/letter/editorial) | | observed isotopic uniformity of sulfides in normal diabase from intrusives suggests little contsminrttion...investigation for sulfides from normal Palisades sill diabase. Specimens 21 to 34 were collected from mineral...isotopic composition of sulfides in the associated diabase. It is perhaps unwise to consider that specimens...HRS 6 22.05 22.06 13. Bornite and covellite: diabase, Virginia. 22.21 22.22 14. Pyrite, pyrrhotite...araenopyrite, massive, from shear zone in Logan diabase sill, Minu. 22.20 4 22.15 +0,7 Sulfides from mineral |  | | Report (issue) | | crystals), Felton's farm (Chester), and Ward's quarry; Montgomery County: Sumneytown, and Perkiomenville...Philadelphia: Fairmount Park, Frankford, and Rit- enhouse quarry. SCOLECITE CaAl 2 Si3 Oi .3H 2 O MONOCLINIC ...white radiating tufts; Delaware County: Ward's quarry, mealy white radiations. DESCRIPTIVE MINERALOGY...mines, the corundum mines at Unionville, Brinton's quarry south of West Chester, and the French Creek iron...illustration selected is the symbol of Brinton's quarry, three miles south of West Chester. REFERENCES |
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