Challenges and Future Trends in K–Ar (40Ar/39Ar) Geochronology, 2nd Edition
A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Mineral Geochemistry and Geochronology".
Deadline for manuscript submissions: 30 August 2024 | Viewed by 1129
Special Issue Editors
Interests: K–Ar (40Ar/39Ar) geochronology; field geology; petrology; mineralogy; opaque mineralogy; graphitization
Special Issues, Collections and Topics in MDPI journals
Interests: orogenic belts; HP-UHP metamorphism; blueschist; serpentinite; jadeitite
Special Issues, Collections and Topics in MDPI journals
Special Issue Information
Dear Colleagues,
Radiogenic 40Ar was discovered from natural minerals in 1948, and the K–Ar dating method has been developed since the 1950s. Subsequently, in the 1960s, the 40Ar/39Ar dating method was established, and further developments in its applications led to improvements in the in situ dating technique. Thus far, this K–Ar (40Ar/39Ar) method has been applied to many varieties of geological materials as the most approachable radiometric dating method. However, the method often yields certain geological inconsistencies and/or anomalously old ages, especially for high- and ultrahigh-pressure (HP–UHP) metamorphic rocks in collisional orogenic belts. For example, some micas in UHP-metamorphosed granite give unusual K–Ar (40Ar/39Ar) ages which are significantly older than the host granite. Such an observation infers the presence of extremely high excess argon. This problem has been discussed by many geochronologists over the last 40 years. Although the reconnaissance of radiogenic argon loss or gain is difficult, multidisciplinary approaches have the potential to uncover the physicochemical behavior of argon in nature and to improve the reliability of the K–Ar (40Ar/39Ar) dating of metamorphic processes.
Understanding the behavior of argon also enables more accurate K–Ar (40Ar/39Ar) dating for young volcanic rocks which have experienced Ar isotope mass fractionation and for fluid-induced gold mineralization with excess argon. Moreover, it would further improve authigenic illite and smectite K–Ar (40Ar/39Ar) dating for fault-gouge rocks, which has been applied to determine fault movements. Recently, the possibility of the in situ 40Ar/39Ar dating of planetary surfaces using cosmogenic 39Ar was proposed; this may be also possible by in situ K-Ar dating.
This Special Issue invites submissions on K–Ar (40Ar/39Ar) geochronology and geochemistry with a multidisciplinary scope, including field observations, petrology, mineralogy, structural geology, and numerical modeling. Studies that help to better understand argon’s behavior in nature are particularly encouraged. Challenging studies on the in situ dating of planetary surfaces will be also welcome.
Dr. Tetsumaru Itaya
Prof. Dr. Tatsuki Tsujimori
Guest Editors
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Keywords
- K–Ar (40Ar/39Ar) geochronology
- excess argon and wave
- argon release by deformation
- exhumation of metamorphic units
- argon behavior in nature
- accurate and reliable dating
- in situ dating of planetary surfaces
Related Special Issue
- Frontier of the K–Ar (40Ar/39Ar) Geochronology in Minerals (5 articles)
Planned Papers
The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.
1. Title: K-Ar and 40Ar/39Ar Analyses of Biotite and Hornblende from Acasta Gneisses in Slave Province
Authors: Tetsumaru Itaya et al.
2. Title: Cooling of Southern Granulite Terrane, India: Evidence from K-Ar Biotite Ages
Authors: Sajeev Krishnan et al.
3. Title: Excess 40Ar in Biotite Revealed by Conventional K-Ar Method Example of the Matsumae Plutonic Complex
Authors: Nobutaka Tsuchiya et al.
4. Title: Exploration Implications of Gajah Tidur, An Older Cu-Mo-(Au) Deposit below the Main Grasberg Porphyry Cu-Au Deposit
Authors: Reza Al Furqan et al.
5. Title: K-Ar Age Mapping of Cordilleran Orogenic Belt including the Cretaceous High-Pressure Metamorphic Franciscan Belt
Authors: Yukio Isozaki et al.