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In situ Rb-Sr dating of fine-grained vein mineralizations using LAICP-MS

Paper i proceeding
Författare M. Tillberg
H. Drake
T. Zack
J. Hogmalm
M. Astrom
Publicerad i Procedia Earth and Planetary Science
ISSN 1878-5220
Publiceringsår 2017
Publicerad vid Institutionen för geovetenskaper
Språk English
Länkar https://doi.org/10.1016/j.proeps.20...
Ämnesord geochronology, in situ Rb-Sr dating, greisen, hydrothermal veins, LA-ICP-MS, crystalline rock, stable-isotopes, trace-elements, se sweden, area, calcite, events
Ämneskategorier Geologi

Sammanfattning

Direct mineral dating is critical for thorough understanding of the genesis of hydrothermal mineralizations, ore forming processes and events of fracturing and related fluid-rock interaction. Since minerals of suitable type and sample volume for conventional techniques can be rare, development of high-precision in situ Rb-Sr dating of common rock-forming minerals such as micas, feldspars and calcite offers possibilities to gain temporal constraints of a wide variety of geological features with detailed spatial and depth resolution. This technique separates Sr-87 from Rb-87 by introducing a reaction gas between two quadropoles in a LAICP- MS system. In this study, in situ Rb-Sr geochronology distinguishes the timing of several different fracture-controlled hydrothermal events: 1 and 2) greisen mineralizations and associated far-field hydrothermal veins adjacent to a granite intrusion, 3) reactivation events within a mylonite shear zone and 4) low-temperature precipitation from saline organic-rich brines in thin veinlets. We demonstrate that in situ Rb-Sr dating is feasible for a broad range of mineral assemblages, textures, temperatures and ages, emphasizing the impending use of this new method in ore deposit exploration and many other research fields.

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