Results 71 to 80 of about 60,881 (232)

THE REFERENCE GAREVKA GRANITE (YENISEI RIDGE, WESTERN MARGIN OF THE SIBERIAN CRATON): THE FINAL ATTEMPT TO VERIFY PALEOPROTEROZOIC Pb/U ISOTOPIC AGE BY M.I. VOLOBUEV

open access: yesГеодинамика и тектонофизика
The article unravels a confusing history of ideas about the age of the Garevka granite pluton, which is considered as a reference object for the Precambrian of the Yenisei ridge.
A. B. Kuzmichev, M. K. Danukalova
doaj   +1 more source

Age of hydrothermal processes in the central iberian zone (Spain) according TO U-Pb dating of cassiterite and apatite

open access: yesЗаписки Горного института, 2017
Results of isotope-geochemical studies by PbLS step-leaching method of cassiterite from greisens located in Logrosán granite massif (Central Iberian Zone, Spain) and apatite from hydrothermal quartz-apatite vein on its exocontact indicate that in both ...
N. G. Rizvanova   +2 more
doaj   +1 more source

Geologic interpretation of a radar mosaic of Yellowstone National Park [PDF]

open access: yes, 1969
Geologic mapping of Yellowstone National Park area by interpretation of radar ...
Prostka, H. J.
core   +2 more sources

Geochemistry of Zircon from Pegmatite-bearing Leucogranites of the Laghman Complex, Nuristan Province, Afghanistan

open access: yesRussian Journal of Earth Sciences
For the first time, a study was carried out on the geochemistry of zircon (SIMS method, 2 samples, 20 points) from leucogranites of the Laghman complex, located in the pegmatite-bearing (LCT-type) province of Nuristan (Afghanistan).
Levashova Ekaterina Valer'evna   +4 more
doaj   +1 more source

Phylogenetic reconciliation provides new insights into the evolutionary diversification of the glutamine synthetase gene family in seed plants. [PDF]

open access: yesFEBS J
Phylogenetic analyses of glutamine synthetase (GS) in seed plants revealed that all three major evolutionary lineages (GS2, GS1a, and GS1b) must have been present in the common ancestor, with GS2 being the first lineage to diverge. Unlike GS1b, GS1a and GS2 are usually single‐copy genes, even though they underwent duplications that resulted in ...
Aledo E   +3 more
europepmc   +2 more sources

Mineralogy and thermobarometry of the Kalevian volcano-plutonic complex of the Kaskama block (Inari Terrane, Kola-Norwegian Region, Fennoscandian Shield)

open access: yesЗаписки Горного института
The petrogenesis and evolution of metamorphic rocks of the volcano-plutonic units of the Kaskama block of the Inari Terrane in northwestern Russia were studied.
Aleksandr B. Vrevsky   +2 more
doaj  

Petrography of El Baúl massifgranitoids, Cojedes state, Venezuela

open access: yesRevista Técnica de la Facultad de Ingeniería, 2015
The granites El Mogote, Mata Oscura and Piñero outcrop in the El Baúl massif, next to metasedimentary, volcanic and   sub volcanic rocks, to the south of Cojedes state, Venezuela.
Patxo Viscarret, Franco Urbani
doaj  

DISTRIBUTION OF TRACE ELEMENTS IN GROWTH ZONES AND SECTORS OF SPODUMENE CRYSTALS (PASHKI DEPOSIT, NURISTAN, AFGHANISTAN) [PDF]

open access: yesМинералогия
Regular distribution of several trace elements in spodumene crystals of the Pashki pegmatite Li deposits in Afghanistan (Nuristan province) is analyzed using secondary ion mass spectrometry (SIMS).
M.A. Ivanov   +3 more
doaj   +1 more source

Welsh Basin [PDF]

open access: yes, 2011
The Cambrian rocks of Wales mostly lie within the Avalon composite terrane, apart from a small area of Cambrian rocks of the Monian composite terrane that is discussed in Chapter 9.
Molyneux, S.G., Rushton, A.W.A.
core  

From source to sink in central Gondwana: Exhumation of the Precambrian basement rocks of Tanzania and sediment accumulation in the adjacent Congo basin [PDF]

open access: yes, 2016
Apatite fission track (AFT) and (U-Th)/He (AHe) thermochronometry data are reported and used to unravel the exhumation history of crystalline basement rocks from the elevated (>1000 m above sea level) but low-relief Tanzanian Craton.
Brown, Roderick   +5 more
core   +1 more source

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