Results 111 to 120 of about 202 (128)

Mineralogy and Geochemistry of Alkali Beryl from the Rare Metal Bearing Pegmatites of Marlagalla-Allapatna, Mandya District, Karnataka

Journal Geological Society of India, 1999
Abstract White coloured alkali beryl from the pegmatites of Mariagalla-Allapatna in Mandya district, Karnataka contains distinctly higher alkali elements (Na, Li, Rb, Ca) and relatively low beryllium oxide (c. 11 % BeO) compared to normal beryl. Beryl occurs mostly between graphic intermediate zone and quartz core in the complexly zoned,
Chanchal Sarbajna, R. P. Sinha, P. Krishnamurthy, K. V. G. Krishna, R. Viswanathan, D. C. Banerjee   +5 more
openaire   +2 more sources

Postorogenic alkali feldspar granite and associated pegmatites in West Avalonia: the petrology of the Neoproterozoic Georgeville Pluton, Antigonish Highlands, Nova Scotia

Canadian Journal of Earth Sciences, 1998
The 579.8 ± 2.2 Ma (40Ar-39Ar, muscovite) Georgeville Pluton in mainland Nova Scotia is an epizonal body consisting of alkali feldspar granite and related pegmatite. The pluton intrudes the ca. 619-608 Ma arc-related rocks of the Georgeville Group, which comprises part of West Avalonia, the largest terrane in the Canadian Appalachians.
J. Brendan Murphy, Alan J. Anderson, Doug A. Archibald   +2 more
  +4 more sources

Phosphorus in alkali feldspars as an indicator for prospecting for pegmatite-type rare-metal ore deposits in Altay, NW China

Geochemistry: Exploration, Environment, Analysis, 2013
The phosphorus contents of alkali feldspars of 80 pegmatite veins from the Chinese Altay, NW China, were determined by electron microprobe in this study. The alkali feldspars of the barren pegmatites are poor in phosphorus and range from <0.01–0.05 wt% P 2 O 5 .
Tang Yong, Zhang Hui, Su Guizhen
openaire   +2 more sources

The evolution of alkali elements and the division of geochemical process for pegmatite Vein No. 3, Altai, Xinjiang, China

Geochemistry, 1982
According to the evolution of alkali elements (e.g. K, Na, Li) and the relationship among them in the melt-solution of pegmatitic magma, the author divides the pegmatitic process for Vein No. 3 into three main geochemical stages associated with mineralization, i.e., K-Na, Na-Li and K stages.
Xianjue Wang
openaire   +2 more sources

On the mineralogy and geochemistry of niobium and tantalum in some granite pegmatites and alkali granites of Africa

Bulletin de Minéralogie, 1981
On étudie la minéralisation niobium˗tantale associée aux pegmatites de granite et aux roches granitiques alcalines d'Afrique et on présente une sélection de 124 analyses chimiques de divers minéraux de niobium et de tantale rencontrés au cours de cette étude.
von Knorring, Oleg, Fadipe, Akinola
openaire   +3 more sources

The potential of lithium in alkali feldspars, quartz, and muscovite as a geochemical indicator in the exploration for lithium-rich granitic pegmatites: A case study from the spodumene-rich Moblan pegmatite, Quebec, Canada

Journal of Geochemical Exploration, 2019
Abstract The Li concentration of alkali feldspars, quartz, and muscovite from the spodumene-rich Main Sill of the Moblan pegmatite in Quebec, Canada, was used to evaluate the potential of the most common minerals in granitic pegmatites as indicators for the presence of Li-aluminosilicate mineralization. In Moblan, alkali feldspar crystals incorporate
Victoria Maneta, Don R. Baker
openaire   +2 more sources

Synthetic Alkali Aluminosilicate-Hydroxide Systems as an Analogue to Optimize Lithium Recovery from LCT Pegmatites

Nail R. Zagrtdenov, Yves Thibault, Joanne Gamage McEvoy, Dominique Duguay   +3 more
openaire   +2 more sources

MINERAL PARAGENESES AND ANALYSIS OF MINERAL EQUILIBRIA IN RARE ALKALI-METAL METASOMATIC ROCKS OF PEGMATITE FIELDS

International Geology Review, 1988
В. Г. Кривовичев
openaire   +2 more sources

Report on RMRE Workshop on ‘ Rare Metal and Rare Earth Element Resources from Carbonatites, Per-alkali Syenites, Granites and Pegmatites of India: Theory and Practice’, 19-24 November, 2018 conducted at the Department of Geology, Jai Narayan Vyas (JNV) University, Jodhpur, Rajasthan, India

Journal of the Geological Society of India, 2019
P. Krishnamurthy, Suresh Chandra Mathur
openaire   +2 more sources

Microtexture and micro FT-IR spectra of alkali feldspar from a pegmatite, the Tanakami pluton, Shiga, Japan

, 2003
Satoshi Nakano, Makoto Ohkuma, Kuniaki Makino   +2 more
openalex   +1 more source