A New 190Pt-4He method of native platinum age determination

«AIRES» SHARED RESEARCH FACILITIES (IPGG RAS, St. PETERSBURG): SCIENTIFIC EQUIPMENT, MAIN RESEARCH DIRECTIONS AND RESULTS

“…Сочетание этих дисциплин дало синергетический эффект, который позволил учреждению стать колыбелью отечественной геохронологии [Gerling, Polkanov, 1958]. Так, из 16 методов изотопной геохронологии, используемых в мире, четыре было разработано в ИГГД -это калий-аргоновый [Gerling, Titov, 1949;Gerling, 1961], гелиевый [Tolstikhin, Kamensky, 1969], ксеноновый [Shukolyukov et al, 1974b] и платино-гелиевый [Shukolyukov et al, 2011]. С 80-х гг.…”

Constant 4He Concentration and 190Pt‐4He age of Detrital Pt‐Alloy Grains from the Santiago River, Ecuador: Potential as a 4He Mineral Reference Material

“…Natural Pt‐alloy grains have potential as 4 He reference material because (i) the alpha particle‐producing isotope ( 190 Pt) is homogeneously distributed within the mineral, which implies homogeneous distribution of the daughter 4 He (Shukolyukov et al . 2011); (ii) 4 He is not lost by diffusion from Pt‐alloys at temperatures below 900 °C (Shukolyukov et al . 2012a, b); (iii) abrasive removal of grain rims during transport means recoil loss of He from the detrital grains is negligible, and (iv) the range of He concentrations in the native Pt‐alloys (10 ‐4 –10 ‐7 cm 3 STP g ‐1 ; Shukolyukov et al .…”

“…Geological reference materials, such as the Columbia River basalt, USGS BCR-2 (Ferreira et al 1975) and the Knyahinya meteorite (Shultz and Franke 2004), have been developed as 4 He reference material but were never widely used. Natural Pt-alloy grains have potential as 4 He reference material because (i) the alpha particle-producing isotope ( 190 Pt) is homogeneously distributed within the mineral, which implies homogeneous distribution of the daughter 4 He (Shukolyukov et al 2011)…”