TY - JOUR

T1 - Age of Mirny field kimberlites (Siberia) and application of rutile and titanite for U-Pb dating of kimberlite emplacement by LA-ICP-MS

AU - Agashev, A. M.

AU - Orihashi, Y.

AU - Pokhilenko, N. P.

AU - Serov, I. V.

AU - Tolstov, A. V.

AU - Nakai, S.

PY - 2016

Y1 - 2016

N2 - This paper presents new data related to the emplacement ages of the Amakinskaya and Taezhnaya kimberlites of the Mirny field, Siberia, located in the southern part of the Yakutian diamondiferous province. This study analyzed rutile and titanite grains along with zircons for U-Pb isotope composition by laser ablation (LA)-inductively coupled plasma-mass spectrometry (ICP-MS) and evaluated the applicability of rutile and titanite for the dating of kimberlite emplacements. Both minerals contain substantial admixtures of common Pb in their Pb isotope composition. Therefore, the 207Pb method was applied for common Pb correction during age calculation. The obtained U-Pb ages of the Taezhnaya pipe were 363 ± 12 and 359 ± 12 Ma, respectively, for zircon and titanite. Ages of 366 ± 10 and 361 ± 16 Ma was obtained from Amakinskaya pipe titanite and rutile, respectively. All age estimates correspond to the main epoch of diamondiferous kimberlite activity in the Siberian platform and suggest the formation of the Mirny kimberlite field within a single event or two separate events occurring close together in time. Results obtained from this study indicate that rutile and titanite can be useful for the dating of kimberlite emplacements.

AB - This paper presents new data related to the emplacement ages of the Amakinskaya and Taezhnaya kimberlites of the Mirny field, Siberia, located in the southern part of the Yakutian diamondiferous province. This study analyzed rutile and titanite grains along with zircons for U-Pb isotope composition by laser ablation (LA)-inductively coupled plasma-mass spectrometry (ICP-MS) and evaluated the applicability of rutile and titanite for the dating of kimberlite emplacements. Both minerals contain substantial admixtures of common Pb in their Pb isotope composition. Therefore, the 207Pb method was applied for common Pb correction during age calculation. The obtained U-Pb ages of the Taezhnaya pipe were 363 ± 12 and 359 ± 12 Ma, respectively, for zircon and titanite. Ages of 366 ± 10 and 361 ± 16 Ma was obtained from Amakinskaya pipe titanite and rutile, respectively. All age estimates correspond to the main epoch of diamondiferous kimberlite activity in the Siberian platform and suggest the formation of the Mirny kimberlite field within a single event or two separate events occurring close together in time. Results obtained from this study indicate that rutile and titanite can be useful for the dating of kimberlite emplacements.

KW - Kimberlite

KW - Rutile

KW - Siberia

KW - Titanite

KW - U-Pb dating

UR - http://www.scopus.com/inward/record.url?scp=84992597244&partnerID=8YFLogxK

U2 - 10.2343/geochemj.2.0438

DO - 10.2343/geochemj.2.0438

M3 - Article

AN - SCOPUS:84992597244

VL - 50

SP - 431

EP - 438

JO - Geochemical Journal

JF - Geochemical Journal

SN - 0016-7002

IS - 5

ER -