Results 121 to 130 of about 1,938 (228)

New Magnetite Reference Material for SIMS δ18O Measurements and a Study of Precision and Accuracy Due to Crystal Orientation Effects

Geostandards and Geoanalytical Research, Volume 50, Issue 2, Page 391-406, June 2026.
Key Points A new magnetite reference material (PF21mt) is available for δ18O measurements by SIMS. Reproducibility of measurement results in two laboratories suggest orientation bias of ±2‰ (2s) at 20 keV. Repeatability improves to ±1‰ (2s) when using a 13 keV protocol, suggesting reduced orientation bias. In situ isotope ratio measurements provide the
Michelle Ulrich, Daniela Rubatto, Maria Rosa Scicchitano, Benita Putlitz, Thomas Bovay   +4 more
wiley   +1 more source

Microbially generated ferruginous crusts: A potential biosignature of continental input in coastal settings

Sedimentology, Volume 73, Issue 4, Page 1225-1243, June 2026.
ABSTRACT Thin ferruginous sandy crusts are common on top of sandstone beds in the Early Permian post‐glacial deposits of the Paraná Basin in southern Brazil. These crusts usually preserve wrinkle structures, suggesting that they might be a product of microbial mediation.
Patrícia Weschenfelder, Renata Guimarães Netto, Alisson Klayton Martins   +2 more
wiley   +1 more source

Disentangling palaeoecological and outcrop controls on MISS occurrence in c. 1 Ga fluvio‐lacustrine facies of the Diabaig Formation, Scotland

Sedimentology, Volume 73, Issue 4, Page 883-913, June 2026.
ABSTRACT The c. 1 Ga Diabaig Formation of north‐west Scotland preserves diverse lacustrine and fluvial facies and abundant microbial and non‐microbial surficial sedimentary features. 172.6 m of section was logged across seven localities to assess the distribution of microbially induced sedimentary structures (MISS) relative to lithofacies, substrate ...
Seán T. Herron, Neil S. Davies, William J. McMahon   +2 more
wiley   +1 more source

Mineralogical Evidence for Highly Evolved Th‐Saturated Magma on Mars

Geophysical Research Letters, Volume 53, Issue 10, 28 May 2026.
Abstract Thorium‐rich (Th‐rich) geological units have been detected by remote sensing in the Martian crust. However, there is still a lack of mineralogical evidence to constrain the magmatic processes responsible for these anomalies. In this study, we report the first discovery of thorite (ThSiO4) grains within a zircon fragment from Martian regolith ...
Xiaojia Zeng, Xiongyao Li
wiley   +1 more source

Rare-metal mineralization and crust-derived magmatism in a collisional orogen: the Variscan metallogenic odyssey of the Sioule region (French Massif Central)

BSGF - Earth Sciences Bulletin
The Sioule region in the northern part of the French Massif Central of the Variscan belt hosts the Echassières complex, where a large W(-Sn) quartz vein system was intruded by the Beauvoir rare-metal granite (RMG) hosting disseminated Sn, Nb-Ta and Li ...
Ballouard Christophe, Carr Patrick A., Monnier Loïs, Fidalgo Jean-Charles, Rocher Océane, Esteves Nicolas, Laurent Oscar, Daoulas-Gérardin Marie, Peiffert Chantal, Declercq Lou, Mercadier Julien, Plunder Alexis, Melleton Jérémie   +12 more
doaj   +1 more source

Morphological and geochemical characteristics of zircon crystals from Smreczyński Wierch migmatite (Western Tatra Mts.)

, 2005
In the Polish part of the metamorphic envelope of the granitoid Rohače pluton, migmatites are the predominant component. Migmatisation took place in the amphibolite facies conditions (T = 690–780C ; P =7.5–11 kbar).
Burda, J.
core  

REE, U, Th, and Hf distribution in zircon from Western Carpathian Variscan granitoids: A combined cathodoluminescence and ion microprobe study

, 2001
A cathodoluminescence (CL) investigation on individual zircon crystals from Variscan S-type granites from the Western Carpathians has been combined with ion microprobe rare earth element (REE) and trace element analyses to explore possible connections ...
Huth, J., Williams, I. S., Poller, U., Hoppe, P.   +3 more
core  

Tracing the provenance of inherited zircons from peraluminous granites in the Lhasa Terrane and its paleogeographic implications.

, 2011
Peraluminous granites with abundant zircon inheritance are derived from partial melting of Al-rich rocks (e.g. metapelite). Thus the U-Pb age data of inherited zircons from peraluminous granites provide insights into provenance of clastic sediments in their source region, as do the detrital zircons from sedimentary rocks (and their metamorphosed ...
Zhu, D.C., Zhao, Z.D., Niu, Y.L., Wang, Q., Dilek, Y., Guan, Q., Liu, Y.S., Mo, X.X.   +7 more
openaire   +1 more source

LA-ICP-MS Zircon U-Pb Isotopic Dating: Constraints on the Time of the Daoxiang Formation in North Fujian Province

Yankuang ceshi, 2014
Although there is poor outcrop in the area, the Daoxiang formation exposed in North Fujian has unique rock assemblage and metamorphism, and deformation characteristics show that the Daoxiang group does exist, and belongs to metamorphic rock of the ...
ZHAO Xi-lin, YU Ming-gang, JIANG Yang, LI Ya-nan, JIN Guo-dong, CHEN Zhi-hong, XING Guang-fu   +6 more
doaj  

U-Pb dating of volcaniclastic deposits from the Sinj Basin: implications for provenance and the tectono-sedimentary evolution of the External Dinarides. [PDF]

Int J Earth Sci
Šamarija R, Andrić-Tomašević N, Mandic O, Zeh A, Mužek K, Pavelić D, Schwotzer M.   +6 more
europepmc   +1 more source