Drilling the new 5G-5 branch hole at Vostok Station for collecting a replicate core of old meteoric ice

Autor:	Alexey V. Bolshunov, A.N. Dmitriev, Dmitrii A. Vasilev, Vladimir Ya. Lipenkov, Nikolai I. Vasilev, Aleksei V. Turkeev, Alexey A. Ekaykin
Rok vydání:	2021
Předmět:	010504 meteorology & atmospheric sciences Drill Operating procedures Drilling Replicate 010502 geochemistry & geophysics 01 natural sciences Coring Core (optical fiber) Paleontology Paleoclimatology Geology 0105 earth and related environmental sciences Earth-Surface Processes
Zdroj:	Annals of Glaciology. 62:305-310
ISSN:	1727-5644 0260-3055
DOI:	10.1017/aog.2021.4
Popis:	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.
Databáze:	OpenAIRE
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