Results 61 to 70 of about 1,623 (184)

Opioid use disorder and dementia risk: evidence from observational and genetic analyses in diverse ancestry cohorts

Alzheimer's &Dementia, Volume 22, Issue 5, May 2026.
Abstract INTRODUCTION Opioid use disorder (OUD) may adversely affect brain health, but its role in dementia risk remains poorly understood. METHODS We investigated associations between OUD and dementia using observational data from 222,518 participants (European and African ancestry) in the Million Veteran Program and Mendelian randomization (MR) using
Sara Javidnia, James M. Roe, Ville Karhunen, Dipender Gill, Steven Bell, Joseph D. Deak, Daniel Levey, Rachel L. Kember, Henry R. Kranzler, Héléne Toinét Cronjé, Stephen Burgess, Joel Gelernter, Klaus P. Ebmeier, Anya Topiwala   +13 more
wiley   +1 more source

Provenance and Petrological Evolution of Sand Injection Complexes: Insights From Heavy Mineral Analysis in the Paleogene Forearc Succession of the San Joaquin Basin

Basin Research, Volume 38, Issue 3, May–June 2026.
The study of heavy mineral assemblages with statistical analysis resolves provenance signatures and quantifies syn‐emplacement modification of sand injection complexes. Results demonstrate transformative petrological processes, including density‐dependent hydraulic sorting and mechanical grain degradation.
Gustavo Zvirtes, Andrew Morton, Andrew Hurst, Ruy Paulo Philipp, Wiktor Luzinski, Giuseppe Palladino, Luciano Alessandretti   +6 more
wiley   +1 more source

Association of greisens (zwitters) and tourmalinites in the granites of the Severny pluton (Chukotka, Russia)

Записки Горного института
In the Severny pluton in Chukotka, an association of rare-metal, tin-bearing topaz-zinnwaldite greisens (zwitters) and tourmaline metasomatites has been identified through geological mapping and mineralogical-petrographic studies.
Viktor I. Alekseev, Yurii B. Marin, Ivan A. Baksheev   +2 more
doaj  

The behavior of major and trace elements of the tourmaline from the Mangavai and Ganjnameh pegmatitic rocks (Hamadan area) [PDF]

پترولوژی, 2016
The Mangavai and Ganjnameh pegmatitic rocks are part of the Alvand granitoid pluton in the Sanandaj-Sirjan zone. The composition of tourmaline in Mangavi is Schorl and that of the Ganjnameh lies in the Schorl- foitite fields.
Ahmad Ahmadi khalaji, zahra Tahmasbi, Farhad Zal, Zahra Shabani   +3 more
doaj  

Tourmaline and Rutile as Indicators of a Magmatic-hydrothermal Origin for Tourmalinite Layers in the São José do Barreiro Area, NE Ribeira Belt, Southern Brazil [PDF]

Geologia USP. Série Científica, 2010
Tourmalines from tourmaline-rich layers intercalated with schists of the Rio Una Unit of the Embu Complex and fromcoarse-grained tourmalinite layers associated with quartzite from São José do Barreiro and Formoso (Central Ribeira Belt,São Paulo State ...
Gianna Maria Garda, Paulo Beljavskis, Liz Zanchetta D’Agostino, Michael Wiedenbeck   +3 more
doaj  

Simultaneous Determination of 29 Trace Elements in Tourmaline by Inductively Coupled Plasma-Mass Spectrometry with Sealed Press Acid Decomposition

Yankuang ceshi, 2017
Tourmaline is a boron-containing aluminosilicate mineral, which is an important non-metallic mineral resource, and an indicator for rock-forming and ore-forming processes.
CHENG Xue-hai, XIA Chuan-bo, ZHENG Jian-ye, ZHANG Wen-juan, LIU Jing   +4 more
doaj   +1 more source

The Chemical States of Color-Induced Cations in Tourmaline Characterized by X-Ray Photoelectron Spectroscopy

Journal of Spectroscopy, 2018
In order to better understand the effect of transition metal cations on color of tourmaline, X-ray photoelectron spectroscopy was used to investigate the species, chemical state, site occupancy, and chemical environment of color-induced metal cations in ...
Ming Li, Hanlie Hong, Ke Yin, Chaowen Wang, Feng Cheng, Qian Fang   +5 more
doaj   +1 more source

Mapping the global research landscape of tourmaline: quantitative advances and implications for mineral exploration and petrogenetic studies

Open Geosciences
Tourmaline, a chemically complex borosilicate mineral, serves as a sensitive recorder of geological processes across a wide range of environments. However, the rapid expansion and disciplinary diversification of tourmaline research over the past two ...
Xi Wei, Ping YuanYe, Hu Ruiying, Song Zongyu   +3 more
doaj   +1 more source

Tourmaline 2017 [PDF]

Elements, 2017
Barb Dutrow, Vincent van Hinsberg, Jan Cempírek, Klaus-Dieter Grevel   +3 more
openaire   +1 more source

Chemical Composition of the Tourmaline from Stratiform Tourmalinites of the Passagem de Mariana Gold Mine, Southeastern Quadrilátero Ferrífero (Minas Gerais, Brazil) [PDF]

Geologia USP. Série Científica, 2009
The Passagem de Mariana Mine in the southeastern part of the Quadrilátero Ferrífero, Minas Gerais, Brazil, is one ofthe oldest Brazilian gold mines. Gold is associated with stratiform tourmalinites and tourmaline-bearing quartz and carbonateveins and ...
Gianna Maria Garda, Johann Hans Daniel Schorscher, Paulo Beljavskis, Marcos de Souza Mansueto, Margareth Sugano Navarro, Andrezza Alves Mota   +5 more
doaj