Results 11 to 20 of about 51,712 (271)

AGE AND GEODYNAMIC SETTINGS OF MIASKITE-PEGMATITES, CARBONATITES, AND Nb-Zr MINERALIZATION OF THE ILMENO-VISHNEVOGORSKY ALKALINE COMPLEX, SOUTH URAL (U-Pb AND Rb-Sr ISOTOPE DATA)

open access: yesГеодинамика и тектонофизика, 2022
The Ilmeno-Vishnevogorsky miaskite-phenite-carbonatite complex (IVС), located in the Urals folded region, is a representative of "linear type" carbonatite complexes, with which Nb-Zr deposits are associated.
I. L. Nedosekova   +3 more
doaj   +1 more source

GEOCHEMISTRY OF TRACE ELEMENTS IN ROCK-FORMING MINERALS OF GNEISSES AND GRANITES OF THE MURZINKA GRANITE AREA, CENTRAL URALS [PDF]

open access: yesМинералогия, 2020
The Murzinka granite area (Central Urals), which combines Murzinka granite pluton and underlying rocks of the Murzinka-Adui metamorphic complex, exhibits an evident WE-trending geochemical zonation of magmatism with increasing of Rb, Li, Nb and Ta ...
S.V. Pribavkin   +2 more
doaj   +1 more source

Spatial and temporal variations of Rb/Sr ratios of the bulk surface sediments in Lake Qinghai

open access: yesGeochemical Transactions, 2010
The Rb/Sr ratios of lake sediments have been suggested as indicators of weathering intensity by increasing work. However, the geochemistry of Rb/Sr ratios of lake sediments is variable between different lakes.
Liu Bin, Xu Hai, Wu Feng
doaj   +1 more source

On the age of pyrochlore carbonatites from the Ilmeno-Vishnevogorsky Alkaline Complex, the Southern Urals (insights from Rb-Sr and Sm-Nd isotopic data)

open access: yesЛитосфера, 2020
Research subject. In this research, we carried out Sm-Nd- и Rb-Sr-dating of pyrochlore carbonatite from the Vishnevogorsky niobium deposit, Ilmeno-Vishnevogorsky Alkaline Complex, Southern Urals.
I. L. Nedosekova   +5 more
doaj   +1 more source

Sr-Nd isotope geochemistry of the early Precambrian sub-alkaline mafic igneous rocks from the southern Bastar craton, Central India [PDF]

open access: yes, 2009
Sr–Nd isotope data are reported for the early Precambrian sub-alkaline mafic igneous rocks of the southern Bastar craton, central India. These mafic rocks are mostly dykes but there are a few volcanic exposures.
BL Weaver   +39 more
core   +1 more source

The Osmium Isotope Signature of Phanerozoic Large Igneous Provinces

open access: yesGeophysical Monograph Series, Page 229-246., 2021

Exploring the links between Large Igneous Provinces and dramatic environmental impact

An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Alexander J. Dickson   +2 more
wiley  

+7 more sources

Factors conditioning the content of chemical elements in soil and mosses in Armenia

open access: yesJournal of Trace Elements and Minerals, 2022
In this research, chemical element contents were determined using the Epithermal neutron activation analysis (Cr, V, Ti, Sr, Rb, As, Zn, Co, Fe, Mn and Ba) and atomic-absorption spectrometry (Cu and Pb) for mosses and X-ray fluorescence spectroscopy (Cr,
Gevorg Tepanosyan   +3 more
doaj   +1 more source

Direct Rubidium-Strontium Dating of Hydrocarbon Charge Using Small Authigenic Illitic Clay Aliquots from the Silurian Bituminous Sandstone in the Tarim Basin, NW China

open access: yesScientific Reports, 2019
Illitic clay is ubiquitous in clastic hydrocarbon reservoirs, and the host for several radiometric isotopes such as the potassium-argon (K-Ar) and rubidium-strontium (Rb-Sr) systems.
Shaojie Li   +7 more
doaj   +1 more source

Forbidden M1 and E2 transitions in monovalent atoms and ions [PDF]

open access: yes, 2017
We carried out a systematic high-precision relativistic study of the forbidden magnetic-dipole and electric-quadrupole transitions in Ca+, Rb, Sr+, Cs, Ba+, Fr, Ra+, Ac2+, and Th3+.
Johnson, W. R.   +2 more
core   +3 more sources

Rb–Sr muscovite age of a pegmatite near Sivakkavaara, Finland [PDF]

open access: yesBulletin of the Geological Society of Finland, 1977
Isotopic analysis of five large books of muscovite from a pegmatite emplaced between the third and fourth deformational phases of the Svecokarelian orogenic episode indicate crystallization before 1880 m.y.
O. van Breemen, D.R. Bowes
doaj   +1 more source

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