|Title||Drilling the new 5G-5 branch hole at Vostok Station for collecting a replicate core of old meteoric ice|
|Author(s)||Aleksei V Turkeev , Nikolai I Vasilev, Vladimir Ya Lipenkov, Alexey V Bolshunov, Alexey A Ekaykin, Andrei N Dmitriev, Dmitrii A Vasilev|
Annals of Glaciology
Recent studies have shown that stratigraphically disturbed meteoric ice bedded at Vostok Station between 3318 and 3539 m dates back to 1.2 Ma BP and possibly beyond. As part of the VOICE (Vostok Oldest Ice Challenge) initiative, a new deviation from parent hole 5G-1 was made at depths of 3270–3291 m in the 2018/19 austral season with the aim of obtaining a replicate core of the old ice. Sidetracking was initiated using the standard KEMS-132 electromechanical drill routinely employed for deep ice coring at Vostok, without significant changes to its initial design. Here we describe the method and operating procedures for replicate coring at a targeted depth in an existing slant hole, involving the use of a cable-suspended electromechanical drill. The design of the milling cutter head used for sidetracking is presented. The performance characteristics and the experience of drilling branch-hole 5G-5 at Vostok are described and discussed.
|Special Collections||International Workshop on Ice Drilling Technology Series, 8th International Ice Drill Symposium|
|Categories||Deep Drilling, Directional/Replicate Drilling|
|Equipment||KEMS / TELGA / TBZS drills|
|Citation||Aleksei V Turkeev , Nikolai I Vasilev, Vladimir Ya Lipenkov, Alexey V Bolshunov, Alexey A Ekaykin, Andrei N Dmitriev, Dmitrii A Vasilev ( 2021 ) Drilling the new 5G-5 branch hole at Vostok Station for collecting a replicate core of old meteoric ice. Annals of Glaciology , 1-6 . doi: 10.1017/aog.2021.4|