Results 71 to 80 of about 15,774 (268)

Determination of trace element profiles in coarse-grained minerals by external millibeam PIXE - A schorl tourmaline study [PDF]

Bulletin of the Geological Society of Finland, 1995
The thick-target PIXE technique was applied to direct analysis of trace elements in tourmaline minerals. Analyses of these minerals with conventional wet-chemical methods are difficult and time consuming.
A. Lindroos, J.-O. Lill, K.-E. Saarela, L. Harju, S.-J. Heselius   +4 more
doaj   +1 more source

Zircons from a Pegmatite Cutting Eclogite (Gridino, Belomorian Mobile Belt): U-Pb-O and Trace Element Constraints on Eclogite Metamorphism and Fluid Activity

Géosciences, 2020
This report presents new data on U-Pb geochronology, oxygen isotopes, and trace element composition of zircon from a pegmatite vein crosscutting an eclogite boudin on Stolbikha Island, Gridino area, Belomorian mobile belt (BMB).
S. Skublov, A. Berezin, Xian‐Hua Li, Qiu-li Li, L. Salimgaraeva, V. Travin, D. Rezvukhin   +6 more
semanticscholar   +1 more source

Three Spodumene Reference Materials for Oxygen Isotope Measurement by Ion Microprobe

Geostandards and Geoanalytical Research, Volume 49, Issue 4, Page 857-869, December 2025.
Key Points Three spodumene reference materials were developed for SIMS oxygen isotope measurement. All three materials are homogeneous in oxygen isotopes. Crystal orientation has no effect on instrumental mass fractionation. This study reports on the development of three spodumene reference materials referred to as Curtin University (CU) Tri‐1, Kun‐A‐1
Andreas T. Hertwig, Johannes Chischi, Axel K. Schmitt, Hans C. Oskierski, Kai Rankenburg, Martin Wells, Benita Putlitz, Zakaria Quadir   +7 more
wiley   +1 more source

Mineralogical Characteristics and TIMS U-Pb Dating of Tantalite-(Mn) from the Bieyesamas Rare Metal Deposit, Xinjiang

Yankuang ceshi, 2020
BACKGROUND Tantalum is a scarce resource in China. A new breakthrough in ore prospecting was obtained on the tantalum ore in the Bieyesamasi area, Xinjiang, including new occurrences as well as the exploration of pegmatite-type rare metal resources ...
HE Han-han, ARKIN Tulson, WANG Deng-hong, WANG Rui-jiang, CHEN Zhen-yu   +4 more
doaj   +1 more source

The Effect of Crystal Orientation on In Situ Rb‐Sr Mica Geochronology

Geostandards and Geoanalytical Research, Volume 49, Issue 4, Page 705-713, December 2025.
Key Points No significant effect of mica grain orientation on Rb‐Sr date. Rb‐Sr laser signal stability is generally better perpendicular to mica c‐axis. No significant matrix effect noted between different mica group members. Mica crystals have a highly asymmetric structure, arranged in sheets of two tetrahedral layers bonded to a single octahedral ...
Kyle P. Larson, Sudip Shrestha, Mark Button, John M. Cottle, Christopher J. Barnes   +4 more
wiley   +1 more source

Pegmatites and alkali feldspar granites as sources of industrial K-feldspar: A study from Borucu, Aksaray, Central Türkiye

Bulletin of the Mineral Research and Exploration
The Borucu (Aksaray) region, within the Central Anatolian Crystalline Complex, comprises a variety of rocks, including granite, alkali feldspar granite (AFG), pegmatite, and aplite dikes.
Gökhan Demirela, Mustafa Haydar Terzi, Ahmet Fatih Oskay   +2 more
doaj   +1 more source

Grey Hill Zircon – A Natural High 176Yb/177Hf Zircon Reference Material for LA‐MC‐ICP‐MS Hf Isotope Measurement

Geostandards and Geoanalytical Research, Volume 49, Issue 4, Page 799-819, December 2025.
Key Points New natural high REE/Hf zircon reference material for in situ Hf isotopic measurement. Hf isotope ratio is independent of zircon textural domains. Stable Hf isotope ratio despite Pb and REE variability. Accurate measurements of Hf isotope ratios in zircon rely on adequate correction for isobaric interferences, which increase in complexity as
Piero A.B. de Sampaio, Hugo K.H. Olierook, Denis Fougerouse, Bradley J. McDonald, Ninna K. Jensen, James N. Connelly, William D.A. Rickard, David W. Saxey, Noreen J. Evans, Martin Bizzarro, Nicholas J. Gardiner, Joshua M. Garber, Luc S. Doucet, Zheng‐Xiang Li   +13 more
wiley   +1 more source

Kunzite from the Haapaluoma pegmatite quarry, western Finland [PDF]

Bulletin of the Geological Society of Finland, 1986
A purple transparent crystal of spodumene, or kunzite, was encountered in the Haapaluoma feldspar quarry, western Finland. The crystal, which is about seven centimetres long, is embedded in purple, fine-scaled lepidolite.
S.I. Lahti, R. Saikkonen
doaj   +1 more source

The Tectonic, Thermal, and Temporal Controls on the Production of Lithium‐Enriched Melts

Geophysical Research Letters, Volume 52, Issue 21, 16 November 2025.
Abstract We present a new tectonically‐based method for understanding the mountain‐belt‐scale controls on the distribution of critical metals, applied to lithium ores. Lithium‐rich melts in collisional zones are produced by biotite‐breakdown reactions, so we analyze the tectonic “filters” that control whether underthrusting (meta‐)sediments reach ...
Alex Copley, Owen Weller
wiley   +1 more source

Electrical characteristics and metallogenic prediction of Baishawo rare metal deposit in northeast Hunan Province

Dizhi lixue xuebao
Objective  The aim of this study is to characterize the deep electrical structure of the Baishawo pegmatite-type deposits, explore the spatial distribution of rare metal mineralization models and ore-conferring carriers, and elucidate the relationship ...
LIU Jianxin, CAO Li, GUO Zhenwei, CAO Chuanghua, CHEN Xu   +4 more
doaj   +1 more source