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| ...................................... . In amphibolite. ...................... r ............................. 85 35 Corundum (emery) in amphibolite at Chester, Mass...........' . In anorthosite --...-........................... Origin of emery in amphibolite at Chester, Mass.................. * 81 86 92...corundum localities in the United States. ....... II. Outcrop of peridotite at Buck Creek, Clay County, N. C...peridotite area, showing the relation of the amphibolite dikes...........................-.--.......--- |
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| ............... Keewatinmeta-sediments and amphibolite............................ 344 344 346 346...shoot of massivesulfidesplungesat about60ø. Pyrrhotite,pyrite, chalcopyrite, and sphaleriteoccurin...The mineralization is near the contact between amphibolite (derived from lavas) and quartz-richschist (derived...Quartzo-feldspathic hornblendeschist(meta-tuff) Amphibolite(meta-basaltand meta-andesite) Post-Keewatin ...G. F. JOKLIK The schistosemeta-sedimentsthat outcrop in the southern part of the mineralized area are |
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| occurrence of sulphide minerals (chalcopyrite, pyrite, pyrrhotite, sphalerite, galena, arsenopyrite) in till (Garrett...bedrock maps of the investigation areas are based on outcrop mapping and geophysical ground measurements done...bedrock map (Fig. 2) has been drawn on the basis of outcrop observations and magnetic and electric ground measurements...sphalerite, galena, pyrite and chalcopyrite. In the amphibolite, there have been found two compact pyrite mineralizations...which contain pyrrhotite (cf. Saksela, 1923; Aurola & Vahatalo, 1939). In amphibolite, there also occur |
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| form separate bodies closely associated with amphibolite in the Lechana area. They occur as inclusions...inclusions within ~2.65 Ga tonalite gneiss. Amphibolite is massive, has a stratiform occurrence and is folded...hosite intruding along the fold limbs. Rare amphibolite xenoliths occur in gabbro-leucogabbro-anorthosite...Ga (2013 ± 18 Ma) U-Pb zircon overgrowth age. Amphibolite exhibit prominent granoblastic polygonal fabric...serpentinized and host widespread magnetite-rich layers. Amphibolite and associated gabbro have conspicuous sulphide |
 | Janoušek, V., Vrána, S., Erban, V., Vokurka, K., Drábek, M. (2008) Metabasic rocks in the Varied Group of the Moldanubian Zone, southern Bohemia - their petrology, geochemical character and possible petrogenesis. Journal of GEOsciences, 53 (1) 31-64 | Journal (article/letter/editorial) |
| Bohemia). The amphibolites are dominated by amphibolite-facies mineral assemblages of mainly tschermakitic...rocks subjected to a high-grade (up to upper amphibolite-facies) metamorphic overprint (Floyd and Winchester...gneisses and subordinate carbonate rocks, in the amphibolite-facies Varied Group, particularly at the contact...Kaplice area (Kröner et al. 1988). The Variscan amphibolite-facies metamorphism has been dated con18 ventionally...numerous intercalations of marble (± dolomite), amphibolite, calc-silicate gneiss, graphitic gneiss and quartzite |
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| Corundum in amphibolite ................................. ........ 21 Corundum (emery) in amphibolite at Chester... 89 91 91 91 ILLUSTRATIONS. Page. PLATE I. Outcrop of peridotite at Buck Creek, Clay County, N. C...peridotite area, showing the relation of the amphibolite dikes........ ............. ..... .............Ideal vertical cross section of corundum in amphibolite at Hunters, Iredell County, N.C.......: .......some BULLETIN NO. 180 U. S. GEOLOGICAL SURVEY OUTCROP OF PERIDOTITE AT BUCK CREEK, CLAY COUNTY, N. C |
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| of the extensional terrane. Primitive cupreous pyrrhotite deposits are hosted in the initial, marae volcanic-clastic...Ashe the on-strike equivalent (Brown, domains amphibolite dominated Lynchburg Formation in Virginia, Formation...sulphur-rich shale sequences. It is notable that the amphibolite units typically concentrate at lithological breaks...a strong west to east mid-greenschist to mid-amphibolite facies metamorphic gradient. Although a gross...lineament. Paleozoic strata are infolded with amphibolite facies gneisses comprising the Hatcher Complex |
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| Bulletin de la Commission Geologique de Finlande N:o 233 On the geophysical investigation in the Virtasalmi...Geologinen tutkimuslaitos • Otaniemi 1967 Bulletin de la Commission Geologique de Finlande N:o 233 ON THE...drawn by Mrs Sisko Sulkanen. Mrs Gillian Häkli trans la ted the manuscript into English. The author wishes... . Chlorite schist ...................... . Amphibolite ... ..... .. ... .. ... ..... . . Gneiss, depending... ... . .. ... . Chalcopyrite ........... . . Pyrrhotite .............. . Pyrite . ........ . .... .. |
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| occurrences of soapstone in the area include: one outcrop of medium-grained blotchy green and grey soapstone...soapstone on the southeast shore of Mile Lake; another outcrop of a coarse-grained greenish soapstone on the northwest...in a dyke cutting chloritic mica schist and amphibolite at the Lun-Echo Gold Mines property. Black tourmaline...streaked with red occur in an ellipsoidal andesite outcrop on a thinly forested rocky knoll 1 mile north of...of 52 A/SW Y"~~S~l~~~tain I x W hi tefish = La ke ~, / / , _, D . ) °" \ >--<., ) xx-- |
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| Elf amphibole-peridotite. Elf troctolite. Elf amphibolite. Elf gabbro. Shooting Creek dunite. Thumping...olivine-gabbro. Corrosion mantles—troctolite . Buck Creek amphibolite. Corundum Hill area. Corundum Hill dunite. Corundum...dunite. French Broad serpentine. Mica-diorite and amphibolite near Marshall. Peridosteatite at the Madison...igneous rocks . In peridotite . In pyroxenite . In amphibolite . 162 164 168 170 170 171 174 174 175 175 177...peridotite area, Jackson County, N. C.... 46 IX. A, Outcrop of laminated dunite at Webster, Jackson County |
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| resulting in trends ranging between NNW and NNE and amphibolite-facies metamorphism imposed on 1 , 2, 3, 4, and...4 3 Deformation resulting in E-W trends and amphibolite-grade metamorphism imposed on 1 and 2 2 Deposition...has been differentiated. Metamorphism was of amphibolite facies grade and the episode terminated with...axial planar fabric. Metamorphism was in the amphibolite facies. A second deformation phase resulted in...strip up to 40 km in width it conforms with the outcrop of the unconsolidated Bullom Group sediments (Hall |
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| contents versus ionic radius for samples of amphibolite.................. Diagram showing chondrite-normalized...• • • • • • • • • • Photograph showing typical outcrop of Emsian limestone in the eastern Crazy Mountains...Alaska Range........ Photograph showing prominent outcrop of the Jeanie Point complex on Montague Island................. Photograph of intertidal-bluff outcrop, showing planar-bedded sequence truncating an underlying...measured on hornblende 30 from garnet-bearing amphibolite (sample 4) collected near the base of the upper |
 | Carlisle, Donald, Berry, Wade L., Kaplan, Isaac R., Watterson, John R. - Eds. (1986) Mineral Exploration: Biological Systems and Organic ma Tier - Rubey Volume V. Prentice-Hall, Inc., Englewood Cliffs, NJ. | Book |
| can be explained in five different ways: Figure 2-lA shows that the change from a sedge meadow to a spruce...therefore found both off and on the metal-rich outcrop. An abrupt zo nation occurs because of the metal...the intolerance of species B for the 1netal-rich outcrop, but in this instance species A is truly an "indicator..."indicator species": it is found exclusively on the outcrop because of its requirement for large available...rocks Nonessential J metal Metal content of outcrop Species A _l_ _ + -,...j,--- - -----t-... I |
