Results 101 to 110 of about 50,106 (261)

Occurrence of Prehnite, Pumpellyite and Garnet in Biotite from Granitic Rocks of the Canadian Appalachians: A Mineral Chemistry Study Using Electron Microprobe [PDF]

Journal of Sciences, Islamic Republic of Iran, 2011
A particular feature of biotite grains from some of the Canadian Appalachian granitic rocks is the presence of lenses of Ca-Al silicates developed along cleavage planes. These from the more to less common are prehnite, pumpellyite and grandite garnet, an
A.A. T. Shabani
doaj  

Biotites in granites, biotites in gneisses, and the status of biotite as a one-mineral environment indicator

Bulletin of the Geological Society of Finland, 1970
Some aspects of one-mineral geological environment indicators are discussed. Factors controlling the composition of biotite in different P, T, and chemical environments are reviewed. On the basis of theoretical considerations and empirical observation it is concluded that biotites in igneous granites may tend to be somewhat richer in iron than biotites
openaire   +2 more sources

Extensional faulting on Tinos island, Aegean sea, Greece: How many detachments? [PDF]

, 2007
Zircon and apatite fission track (ZFT and AFT) and (U-Th)/He, 40Ar/39Ar hornblende, and U-Pb zircon ages from the granites of Tinos Island in the Aegean Sea, Greece, suggest, together with published ZFT data, that there are three extensional detachments ...
Altherr, Andrew Carter, Avigad, Avigad, Ballard, Barbarand, Black, Boven, Brichau, Brichau, Bröcker, Bröcker, Clauer, Coulson, Dahl, Daniel Stockli, Donelick, Dürr, Esser, Farley, Faure, Forster, Foster, Fytikas, Galbraith, Gessner, Godfriaux, Green, Hejl, Hourigan, House, Hurford, Hurford, John, Kelley, Ketcham, Ketcham, Kumerics, Lee, Lister, Maluski, Maurice Brunel, Mehl, Melidonis, Miller, Patriat, Patrick Monié, Patzak, Pearce, Rahn, Regenauer-Lieb, Reiners, Ring, Ring, Ring, Ring, Ring, Ring, Ring, Ring, Robert Bolhar, Robertson, Samson, Schmädicke, Shaked, Stern, Stockli, Stockli, Stéphanie Brichau, Stöckhert, Tagami, Thomson, Tomaschek, Uwe Ring, Villa, Watson, Weidmann, Wijbrans, York, Zeffren   +79 more
core   +3 more sources

Loess Studies in Aotearoa New Zealand

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 2, June 2026.
Loess in Aotearoa New Zealand (ANZ) has been studied since its first documented recognition (on Banks Peninsula) in 1878 by Julius von Haast. A decade later, John Hardcastle revealed that southern ANZ loess was both glacial in origin and contained signals of past climates.
Brent V. Alloway, David J. Lowe, Bradley J. Pillans, Peter C. Almond, Alan S. Palmer   +4 more
wiley   +1 more source

Geophysical assessment of subsurface conditions at proposed building sites: implications for foundation failure and building collapse [PDF]

, 2018
Building collapse has been a recurrent environmental hazard in Nigeria in the last two decades. This is a corollary of inadequate foundation investigation prior to construction, poor government policies, and general lack of awareness on the importance of
Ariyo, Stephen Oluwafemi, Bayewu, Olateju O., Fatoba, Julius Ogunmola, Lawal, Muhideen A., Omosanya, Kamadeen Olawale   +4 more
core  

Rifting and arc-related early Paleozoic volcanism along the North Gondwana margin: geochemical and geological evidence from Sardinia (Italy) [PDF]

, 2012
Three series of volcanic rocks accumulated during the Cambrian to Silurian in the metasediment-dominated Variscan basement of Sardinia. They provide a record of the changing geodynamic setting of the North Gondwana margin between Upper Cambrian and ...
BUZZI L, FUNEDDA A., GAGGERO L, OGGIANO G   +3 more
core   +1 more source

Progressively Fenitised Schist and Carbonatitic Clasts From a Metasomatic Aureole Beneath the Alkalic Dunedin Volcano, Otago, New Zealand

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 2, June 2026.
Clasts of albite‐porphyroblastic quartzofeldspathic schist, derived from the Otago Schist basement, occur within the Port Chalmers Breccia, a diatreme at the centre of the Dunedin stratovolcano, New Zealand. Schists have undergone varying degrees of replacement reactions (at temperatures of 300° to >500°C) producing hornfelses, with Ca‐ and K‐enriched ...
Alan F. Cooper
wiley   +1 more source

The late Mesozoic-Cenozoic tectonic evolution of the South China Sea: A petrologic perspective [PDF]

, 2014
This paper presents a review of available petrological, geochonological and geochemical data for late Mesozoic to Recent igneous rocks in the South China Sea (SCS) and adjacent regions and a discussion of their petrogeneses and tectonic implications. The
Castillo, PR, Shi, X, Yan, Q
core   +2 more sources

Timing of Metamorphism and Deformation in the Neoarchean Quetico Metasedimentary Belt, Superior Craton, Constrained by Garnet Trace‐Element Mapping and Lu–Hf Geochronology

Journal of Metamorphic Geology, Volume 44, Issue 4, Page 265-286, May 2026.
ABSTRACT The Quetico subprovince of the Superior Province is among the largest metasedimentary belts globally and provides evidence of tectonic processes at play during the final stages of Archean cratonization. Although previous studies have shown that deformation and metamorphism of the 2.7‐Ga turbiditic protolith resulted in regional subvertical ...
Adrian G. Rehm, Antoine Godet, Doug Tinkham, Carl Guilmette, Matthijs A. Smit   +4 more
wiley   +1 more source

Iron in Surface and Subsurface Waters, Grizzly Bar, Southeastern Alaska [PDF]

, 1972
Completion Report for Project A-019-ALAS to the Office of Water Resources Research, Department of the Interior, August 1972Atomic absorption spectrophotometric measurements for total iron were made on 69 samples of water from 8 different environments in
Hoskin, Charles M., Slatt, Roger M.
core