Single Spot Rb-Sr Isochron Dating of Biotite by LA-MC-ICP-MS/MS

被引：13

作者：

Cruz-Uribe, Alicia M. ^{[1
]}

Craig, Grant ^{[2
]}

Garber, Joshua M. ^{[3
]}

Paul, Bence ^{[4
,5
]}

Arkula, Cemil ^{[1
]}

Bouman, Claudia ^{[2
]}

机构：

[1] Univ Maine, Sch Earth & Climate Sci, 5790 Bryand Global Sci Ctr, Orono, ME 04469 USA

[2] Thermo Fisher Sci Bremen GmbH TM, Hanna Kunath Str 11, D-28199 Bremen, Germany

[3] Penn State Univ, Dept Geosci, University Pk, PA 16802 USA

[4] Elemental Sci Lasers, 685 Old Buffalo Trail, Bozeman, MT 59715 USA

[5] Univ Melbourne, Sch Geog Earth & Atmospher Sci, Parkville, Vic 3010, Australia

来源：

GEOSTANDARDS AND GEOANALYTICAL RESEARCH | 2023年 / 47卷 / 04期

基金：

美国国家科学基金会;

关键词：

Rb-Sr; geochronology; tandem mass spectrometry; LA-MC-ICP-MS/MS; PLASMA-MASS-SPECTROMETRY; WESTERN MAINE; REGIONAL METAMORPHISM; GEOLOGICAL-MATERIALS; ISOTOPE MEASUREMENTS; IOLITE FREEWARE; LASER; PRECISION; STRONTIUM; FRACTIONATION;

D O I：

10.1111/ggr.12518

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Laser ablation tandem mass spectrometry is a burgeoning field for in situ Rb-Sr geochronology. Here, we determined simultaneous isotope ratios of Sr-87/Sr-86 and Rb-87/Sr-86 in metamorphic biotite from western Maine, using an ESL (TM) imageGEO (TM) 193 excimer laser ablation system coupled to a Thermo Scientific (TM) Neoma (TM) MC-ICP-MS/MS. Measurements were made on Faraday cups with Rb+ at mass 87; Sr isotopes were reacted with SF6 gas and measured as SrF+ at masses 103-107. Twenty-two laser spots in biotite from a single sample yield a "traditional" Rb-Sr isochron date of 289 +/- 6 Ma. Time-resolved signals reveal significant zoning in Sr-87/Sr-86 and Rb-87/Sr-86 within single spot analyses, which were used to construct single spot isochrons. Individual laser spots contain multiple isochronous subpopulations; some spots contain up to three distinct Rb-Sr isochrons that are decoupled from variations in Rb/Sr. Thirty-five isochron dates were determined using this "sub-spot" approach, with Sr-87/Sr-86 intercepts that systematically vary with Rb-Sr date; two-point isochrons were calculated for individual integrations (n = 780) based on these variable intercepts. Both methods yield age peaks at 303, 270 and 240 Ma. These data suggest that the Rb-Sr system has the potential to record multiple heating, cooling or fluid-alteration events spanning similar to 100 My within small domains in single biotite crystals.

引用

页码：795 / 809

页数：15

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