Results 111 to 120 of about 658,769 (293)

Exploring the Potential of ⁸⁷Sr/⁸⁶Sr Isotope Ratio with Strontium and Rubidium Levels to Assess the Geographic Origin of Saffron. [PDF]

Foods, 2023
Horacek M, Lage M, Vakhlu J.
europepmc   +1 more source

Replacement of Ores Recorded by Textures and Chemical Compositions of Sphalerite: An Example From the Furutobe Kuroko Deposit, Akita, Japan

Geological Journal, EarlyView.
Coupled dissolution‐reprecipitation of early formed Cd‐, Fe‐, Ag‐ and Sb‐poor sphalerite through interaction with high‐temperature and high‐sulphur fugacity Cu‐rich fluids, responsible for the formation of the yellow ores, resulted in the formation of Cd‐, Fe‐, Ag‐ and Sb‐rich, heavily chalcopyrite‐diseased sphalerite and enrichment of critical metals ...
Manuel Nopeia, Ryohei Takahashi, Andrea Agangi, Pearlyn Manalo, Hinako Sato   +4 more
wiley   +1 more source

Sr isotope evidence for new magma inputs and short residence times in the XX century activity of Stomboli Volcano. [PDF]

, 1999
Stromboli is the type locality of continuous and moderately explosive volcanic activity. Monitoring temporal variations in the composition of the material erupted allows constraints to be made on the magma chamber dynamics and volcanic hazard.
Gareth R. Davies, Francalanci, Lorella, Francalanci, L., Davies, G.R.; id_orcid, Tommasini, Simone, Simone Tommasini, Tommasini, S., Conticelli, S., Davies, G.R., Lorella Francalanci, Conticelli, Sandro, Sandro Conticelli   +11 more
core   +1 more source

The Giant Pacific Oyster (Crassostrea gigas) as a modern analog for fossil ostreoids: Isotopic (Ca, O, C) and elemental (Mg/Ca, Sr/Ca, Mn/Ca) proxies

Geochemistry, Geophysics, Geosystems, 2013
Modern analogs are an essential part of palaeoclimate studies, because they provide the basis for the understanding of geochemical signatures of fossils.
Clemens V. Ullmann, Florian Böhm, Rosalind E.M. Rickaby, Uwe Wiechert, Christoph Korte   +4 more
doaj   +1 more source

Geochemistry and Geochronology of Magmatic Rocks in Southwestern and Northeastern Cambodia: Implications for the Tectonic Evolution and Metallogenesis of the Loei Fold Belt

Geological Journal, EarlyView.
The composition of intrusive rocks suggests that the magma was likely generated in a subduction‐related setting. The arc crustal thickness in the Phnom Sro Ngam and Halo Prospects was probably < 40 km during emplacement. Zircon U–Pb age range indicates a correlation with Loei Fold Belt magmatic activity.
Sirisokha Seang, Khin Zaw, Kakda Kret, Ivan Belousov, Kotaro Yonezu, Koichiro Watanabe, Charles Makoundi   +6 more
wiley   +1 more source

Use of 1012 ohm current amplifiers in Sr and Nd isotope analyses by TIMS for application to sub-nanogram samples

, 2013
We have investigated the use of current amplifiers equipped with 10 12 ohm feedback resistors in thermal ionisation mass spectrometry (TIMS) analyses of sub-nanogram sample aliquots for Nd and Sr isotope ratios. The results of analyses using the 1012 ohm
Schwieters, J.B., Davies, G.R.; id_orcid, Bouman, C., Koornneef, J.M., Koornneef, J.M.; id_orcid, Davies, G.R.   +5 more
core   +1 more source

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

, 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.
Ellam, R.M., Ellam, Rob M., Gautam, Gulab C., Srivastava, R.K., Gautam, G.C., Srivastava, Rajesh K.   +5 more
core   +1 more source

Multifaceted orogenic fluid dynamics unraveled by hydrothermal epidote [PDF]

European Journal of Mineralogy
Characterizing fluid circulation in orogens is key to understanding orogenic processes because fluid–rock interaction modifies the physical properties of rocks, hence their response to deformation and, for example, their suitability for radioactive waste
V. Peverelli, A. Berger, M. Wille, T. Pettke, B. Putlitz, A. Mulch, A. Mulch, E. Gnos, M. Herwegh   +8 more
doaj   +1 more source

Late Pleistocene Volcanic Rocks From Tengchong Volcanic Field at SE Tibetan Plateau: Constraints on Petrogenesis and Mantle and Crustal Processes

Geological Journal, EarlyView.
Early zircon saturation and crystallisation occur in mafic (52–54 wt.% SiO2) lavas at Tengchong volcanic field. These early formed zircons with high δ18O (6.6‰–7.9‰) indicates mantle enrichment by subducted supracrustal materials. ABSTRACT Late Pleistocene (< 0.2 Ma) mafic and evolved volcanic rocks occur in northern Tengchong Volcanic Field, SE ...
Lizhu Wang, Haibo Zou
wiley   +1 more source

The Nd and Sr isotopic evolution of Proterozoic seawater

Geophysical Research Letters, 1988
Nd and Sr isotopic measurements from a variety of marine chemical precipitates provide insight into processes controlling the chemistry of seawater during the Proterozoic. Nd isotope measurements on banded iron formations and phosphorites, and Sr isotope measurements on carbonates indicate that during both the Early and Late Proterozoic, hydrothermal ...
Louis A. Derry, Stein B. Jacobsen
openaire   +1 more source