In Situ Rb-Sr Dating of Fine-grained Vein Mineralizations Using LA-ICP-MS

Tillberg, Mikael; Drake, Henrik; Zack, Thomas; Högmalm, Johan; Åström, Mats E.

doi:10.1016/j.proeps.2016.12.117

Cited by 16 publications

(21 citation statements)

References 7 publications

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“…13 Such an approach has been successful in laser ablation Rb-Sr dating using single collector inductively coupled plasma mass spectrometers equipped with collision cells and pre-cell quadrupole mass-lters (CC-ICPMS/MS). 6,11,14,15 Analytical precision is an important limit in such work and, as a result, many of the previous studies have focused on samples containing minerals with very high Rb/Sr (e.g. 87 Rb/ 86 Sr ratios >500) or samples that are particularly old (>1 Ga).…”

Section: Introductionmentioning

confidence: 99%

In situ Rb–Sr dating by collision cell, multicollection inductively-coupled plasma mass-spectrometry with pre-cell mass-filter, (CC-MC-ICPMS/MS)

Bevan

Coath

Lewis

et al. 2021

J. Anal. At. Spectrom.

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show abstract

Section: Introductionmentioning

confidence: 99%

In situ Rb–Sr dating by collision cell, multicollection inductively-coupled plasma mass-spectrometry with pre-cell mass-filter, (CC-MC-ICPMS/MS)

Bevan

Coath

Lewis

et al. 2021

J. Anal. At. Spectrom.

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show abstract

“…Following the work of Zack and Hogmalm (2016) and Hogmalm et al (2017) for assessing the most suitable reaction cell gases, several publications have attempted to solve geological problems using the in situ Rb-Sr technique (Şengün et al, 2019;Tillberg et al, 2017;Tillberg et al, 2020). All these studies, except the one from Tillberg et al (2020), identified only a single age population within individual samples, which could have been resolved (at higher precision) with solution Rb-Sr or 40 Ar/ 39 Ar.…”

Section: Introductionmentioning

confidence: 99%

Resolving multiple geological events using in situ Rb-Sr geochronology: implications for metallogenesis at Tropicana, Western Australia

Olierook¹,

Rankenburg²,

Ulrich³

et al. 2020

Preprint

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Abstract. Dating multiple geological events in single samples using thermochronology and geochronology is relatively common but it is only with the recent advent of triple quadrupole LA-ICP-MS that in situ Rb-Sr dating has become a more commonly applied and powerful tool to date K- and Rb-bearing minerals. Here, we date, for the first time, two generations of mineral assemblages in individual thin sections using the in situ Rb-Sr method. Two distinct mineral assemblages, both probably associated with Au mineralization, are identified in samples from the Tropicana gold mine in the Albany–Fraser Orogen, Western Australia. For Rb-Sr purposes, the key dateable minerals are two generations of biotite, and additional phengite associated with the second assemblage. Our results reveal that the first, coarse-grained generation of biotite grains records a minimum age of 2535 ± 18 Ma, coeval with previous 40Ar/39Ar biotite, Re-Os pyrite and U-Pb rutile results. The second, fine-grained and recrystallized generation of biotite grains record an age of 1207 ± 12 Ma across all samples. Phengite and muscovite yielded broadly similar results at ca. 1.2 Ga but data is overdispersed for a single coeval population of phengite and shows elevated age uncertainties for muscovite. We propose that the ca. 2530 Ma age recorded by various geochronometers represents cooling and exhumation, and that the age of ca. 1210 Ma is related to major shearing associated with the regional deformation associated with Stage II of the Albany–Fraser Orogeny. This is the first time that an age of ca. 1210 Ma has been identified in the Tropicana Zone, which may have ramifications for constraining the timing of mineralization in the region. The in situ Rb-Sr technique is currently the only tool capable of resolving both geological events in these rocks.

show abstract

“…Following the work of Zack and Hogmalm (2016) and Hogmalm et al (2017) for assessing the most suitable reaction cell gases, several publications have attempted to solve geological problems using the in situ Rb-Sr technique (Şengün et al, 2019;Tillberg et al, 2017Tillberg et al, , 2020. All of these studies, except the one from Tillberg et al (2020), identified only a single age population within individual samples, which could have been resolved (at higher precision) with solution Rb-Sr or 40 Ar/ 39 Ar. Tillberg et al (2020) observed multiple age populations in their samples, but these were from mineral separates and the textural context was not pre-served.…”

Section: Introductionmentioning

confidence: 99%

“…All of these studies, except the one from Tillberg et al (2020), identified only a single age population within individual samples, which could have been resolved (at higher precision) with solution Rb-Sr or 40 Ar/ 39 Ar. Tillberg et al (2020) observed multiple age populations in their samples, but these were from mineral separates and the textural context was not pre-served. To date, no published study has taken full advantage of the spatial resolving power of the in situ Rb-Sr technique whilst retaining textural context.…”

Section: Introductionmentioning

confidence: 99%

Resolving multiple geological events using in situ Rb–Sr geochronology: implications for metallogenesis at Tropicana, Western Australia

Olierook

Rankenburg

Ulrich³

et al. 2020

Geochronology

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Abstract. Dating multiple geological events in single samples using thermochronology and geochronology is relatively common, but it is only with the recent advent of triple quadrupole laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) that in situ rubidium–strontium (Rb–Sr) dating has become a more commonly applied and powerful tool to date K-rich or Rb-bearing minerals. Here, we date two generations of mineral assemblages in individual thin sections using the in situ Rb–Sr method. Two distinct mineral assemblages, both probably associated with Au mineralization, are identified in samples from the Tropicana gold mine in the Albany–Fraser Orogen, Western Australia. For Rb–Sr purposes, the key dateable minerals are two generations of biotite as well as additional phengite associated with the younger assemblage. Our results reveal that the first, coarse-grained generation of biotite grains records a minimum age of 2535±18 Ma, coeval with previous 40Ar∕39Ar biotite, rhenium–osmium (Re–Os) pyrite and uranium–lead (U–Pb) rutile results. The second, fine-grained and recrystallized generation of biotite grains record an age of 1207±12 Ma across all samples. Phengite and muscovite yielded broadly similar results at ca. 1.2 Ga, but data are overdispersed for a single coeval population of phengite and show elevated age uncertainties for muscovite. We propose that the ca. 2530 Ma age recorded by various geochronometers represents cooling and exhumation and that the age of ca. 1210 Ma is related to major shearing associated with the regional deformation as part of Stage II of the Albany–Fraser Orogeny. This is the first time that an age of ca. 1210 Ma has been identified in the Tropicana Zone, which may have ramifications for constraining the timing of mineralization in the region. The in situ Rb–Sr technique is currently the only tool capable of resolving both geological events in these rocks.

show abstract

In Situ Rb-Sr Dating of Fine-grained Vein Mineralizations Using LA-ICP-MS

Cited by 16 publications

References 7 publications

In situ Rb–Sr dating by collision cell, multicollection inductively-coupled plasma mass-spectrometry with pre-cell mass-filter, (CC-MC-ICPMS/MS)

In situ Rb–Sr dating by collision cell, multicollection inductively-coupled plasma mass-spectrometry with pre-cell mass-filter, (CC-MC-ICPMS/MS)

Resolving multiple geological events using in situ Rb-Sr geochronology: implications for metallogenesis at Tropicana, Western Australia

Resolving multiple geological events using in situ Rb–Sr geochronology: implications for metallogenesis at Tropicana, Western Australia

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