Rapid decomposition of geological samples by ammonium bifluoride (NH 4 HF 2 ) for combined Hf‐Nd‐Sr isotope analyses

2021 ◽  
Author(s):  
Gábor Újvári ◽  
Urs Klötzli ◽  
Monika Horschinegg ◽  
Wencke Wegner ◽  
Dorothee Hippler ◽  
...  
Keyword(s):  
Geological Samples ◽  
Sr Isotope ◽  
Rapid Decomposition ◽  
Ammonium Bifluoride ◽  
Isotope Analyses

Review of High-Precision Sr Isotope Analyses of Low-Sr Geological Samples

2015 ◽  
Vol 26 (5) ◽  
pp. 763-774 ◽  
Author(s):  
Jie Lin ◽  
Yongsheng Liu ◽  
Haihong Chen ◽  
Lian Zhou ◽  
Zhaochu Hu ◽  
...  
Keyword(s):  
High Precision ◽  
Geological Samples ◽  
Sr Isotope ◽  
Isotope Analyses

An improved separation scheme for Sr through fluoride coprecipitation combined with a cation-exchange resin from geological samples with high Rb/Sr ratios for high-precision determination of Sr isotope ratios

2020 ◽  
Vol 35 (5) ◽  
pp. 953-960
Author(s):  
Wen-Gang Liu ◽  
Shuang Wei ◽  
Jian Zhang ◽  
Cong Ao ◽  
Fu-Tian Liu ◽  
...  
Keyword(s):  
Cation Exchange ◽  
High Precision ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Separation Scheme ◽  
Geological Samples ◽  
Sr Isotope ◽  
Precision Determination ◽  
High Precision Determination

A new separation method for Sr involving HF coprecipitation combined with AG50 resin from samples with high Rb/Sr ratios.

785 nm femtosecond laser ablation for improved precision and reduction of interferences in Sr isotope analyses using MC-ICP-MS

2011 ◽  
Vol 26 (2) ◽  
pp. 341-351 ◽  
Author(s):  
Zhaoping Yang ◽  
Brian J. Fryer ◽  
Henry P. Longerich ◽  
Joel E. Gagnon ◽  
Iain M. Samson
Keyword(s):  
Laser Ablation ◽  
Femtosecond Laser ◽  
Femtosecond Laser Ablation ◽  
Sr Isotope ◽  
Icp Ms ◽  
Isotope Analyses

Celestine discovered in Hawaiian basalts

2020 ◽  
Vol 105 (1) ◽  
pp. 52-57
Author(s):  
Michael O. Garcia ◽  
Eric Hellebrand
Keyword(s):  
Oceanic Islands ◽  
Sr Isotope ◽  
Fine Grained ◽  
Host Basalt ◽  
Mid Ocean Ridge ◽  
The Matrix ◽  
First Occurrence ◽  
Oceanic Basalts ◽  
Ocean Ridge ◽  
Isotope Analyses

Abstract We report here the first occurrence of celestine (SrSO4) in recent oceanic basalts. Celestine was found in moderately altered accidental volcanic blocks from Ka‘ula Island, a rejuvenated tuff cone in the northern Hawaiian Islands. This occurrence is novel not only for the presence of celestine but also for the absence of barite, the sulfate mineral most commonly found in oceanic hydrothermal deposits. Celestine was found lining vesicles and partially fillings voids within the matrix of several high Sr (2200–6400 ppm) Ka‘ula basalts. High-quality wavelength-dispersive microprobe analyses of celestine are reported here for near end-member celestine (>90%). The Ka‘ula celestine deposits are compositionally heterogeneous with large variations in Ba content (0.9–7.5 wt%) within single mineral aggregates. The most likely source of the Sr for celestine in the Ka‘ula basalts was the host basalt, which contains ~1200 ppm. This is about 10 times higher than normally found in mid-ocean ridge basalts and 4 times greater than commonly observed in Hawaiian basalts. Hydrothermal alteration by S-bearing fluids related to the eruption that transported these accidentally fragments probably mobilized Sr in the blocks. These S-rich solutions later precipitated celestine during or following the eruption. We were unable to confirm the origin for the Sr via Sr isotope measures because the Ka‘ula celestine was too fine grained, friable, and widely dispersed to be concentrated for Sr isotope analyses. Future studies of basalts from active volcanoes on oceanic islands, especially for basalts with elevated Sr contents (>1000 ppm), should be aware of the possible presence of celestine in moderately altered lavas.

scholarly journals Rb-Sr age determination of the Kattsund-Koster dyke swarm in the Østfold-Marstrand belt of the Sveconorwegian Province, W Sweden - SE Norway

1988 ◽  
Vol 37 ◽  
pp. 51-61
Author(s):  
B. Hageskov ◽  
S Pedersen
Keyword(s):  
Shear Zone ◽  
Baltic Shield ◽  
Age Determination ◽  
Dyke Swarm ◽  
Sr Isotope ◽  
Se Norway ◽  
The Baltic ◽  
Isotope Analyses

The Kattsund-Koster dyke swarm in the Sveconorwegian Province of the Baltic shield is a dense swarm of evolved tholeiites derived from N-MORB type parental magmas selectively contaminated with K, Rb and Ba. In the Koster archipelago the NNE-SSW trending dyke swarm enters a ductile sinistral shear zone in the margin of which the dolerites are partially recrystallised metadolerites. In the highly deformed interior of the shear zone the dykes are completely recrystallised to amphibolites. Rb-Sr isotope analyses have been carried out on samples of the dolerites and the partially recrystallised metadolerites. A profile through one dolerite yields a whole rock age of 1421 ± 25 Ma with a (87Srl"6S)0 ratio of 0. 7028 ± 0.0002. Samples of the dolerites and partially recrystallised metadolerites lie close to the isochron. The age of 1421 Ma indicates that the dyke swarm is the oldest member of a 1420-1300(?) Ma old bimodal suite of tholeiites and potassic granites, which were injected into the crust under tensional conditions.

New constraints on the source, composition, and post-emplacement modification of kimberlites from in situ C–O–Sr-isotope analyses of carbonates from the Benfontein sills (South Africa)

2020 ◽  
Vol 175 (4) ◽  
Author(s):  
Montgarri Castillo-Oliver ◽  
Andrea Giuliani ◽  
William L. Griffin ◽  
Suzanne Y. O’Reilly ◽  
Russell N. Drysdale ◽  
...  
Keyword(s):  
South Africa ◽  
Sr Isotope ◽  
Isotope Analyses

scholarly journals Decoupling of inorganic and organic carbon during slab mantle devolatilisation

2022 ◽  
Vol 13 (1) ◽  
Author(s):  
P. Bouilhol ◽  
B. Debret ◽  
E. C. Inglis ◽  
M. Warembourg ◽  
T. Grocolas ◽  
...  
Keyword(s):  
High Pressure ◽  
Organic Carbon ◽  
Subduction Zones ◽  
Inorganic Carbon ◽  
Mantle Wedge ◽  
Isotope Composition ◽  
Sr Isotope ◽  
Ultra High Pressure ◽  
Isotope Analyses ◽  
Inorganic And Organic

AbstractSerpentinites are an important sink for both inorganic and organic carbon, and their behavior during subduction is thought to play a fundamental role in the global cycling of carbon. Here we show that fluid-derived veins are preserved within the Zermatt-Saas ultra-high pressure serpentinites providing key evidence for carbonate mobility during serpentinite devolatilisation. We show through the O, C, and Sr isotope analyses of vein minerals and the host serpentinites that about 90% of the meta-serpentinite inorganic carbon is remobilized during slab devolatilisation. In contrast, graphite-like carbonaceous compounds remain trapped within the host rock as inclusions within metamorphic olivine while the bulk elemental and isotope composition of organic carbon remains relatively unchanged during the subduction process. This shows a decoupling behavior of carbon during serpentinite dehydration in subduction zones. This process will therefore facilitate the transfer of inorganic carbon to the mantle wedge and the preferential slab sequestration of organic carbon en route to the deep mantle.

Geomorphological, paleontological and 87Sr/86Sr isotope analyses of early Pleistocene paleoshorelines to define the uplift of Central Apennines (Italy)

2007 ◽  
Vol 67 (3) ◽  
pp. 487-501 ◽  
Author(s):  
Marco Mancini ◽  
Elisabetta D'Anastasio ◽  
Mario Barbieri ◽  
Paolo Marco De Martini
Keyword(s):  
Isotope Ratio ◽  
Early Pleistocene ◽  
Uplift Rate ◽  
Sr Isotope ◽  
Central Apennines ◽  
Western Margin ◽  
Tiber River ◽  
Eastern Border ◽  
Isotope Analyses ◽  
Important Marker

AbstractThe eastern border of the Middle Valley of the Tiber River is characterized by several Plio-Pleistocene paleoshorelines, which extend for about 100 km along the western margin of the Central Apennines (Italy). We studied these paleoshorelines by the means of geological and paleontological analyses and new 87Sr/86Sr isotope analyses. The youngest and uppermost paleoshorelines have been detected and mapped through detailed geologic and stratigraphic surveys, which led to the recognition of nearshore deposits, cliff breccias, alignments of Lithophaga borings, fossil abrasion notches and wave-cut platforms. The altitude of these paleoshorelines decreases almost regularly in the NNW–SSE direction from 480 to 220 m a.s.l. Measurements of the 87Sr/86Sr isotope ratio have been conducted on corals and mollusks collected from sediments outcropping close to the paleoshorelines. The isotopic dating results indicate numerical values that range between 0.70907 and 0.70910 all over the 100-km outcrop. These results, together with biostratigraphic data, constrain the age of the youngest paleoshorelines to 1.65–1.50 Ma. These paleoshorelines are thus considered almost isochronous, giving an estimated uplift rate of 0.34–0.17±0.03 mm/a moving from NNW to SSE. Shape, length and continuity of the 100-km-long observed movements indicate that the studied paleoshorelines are an important marker of the Quaternary uplift of the Central Apennines.

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