Bouncing core barrels; measuring elastic rebound in recovering inner core barrels from 7000+ mBRT

Author(s): Toczko, Sean; Fulton, Patrick M.; Shinmoto, Yuichi; Maeda, Lena; Judge, Simon
Author Affiliation(s): Primary:
Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan
University of California at Santa Cruz, United States
Mantle Quest Japan, Japan
Volume Title: AGU 2015 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2015; American Geophysical Union 2015 fall meeting, San Francisco, CA, Dec. 14-18, 2015. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: Drilling-induced damage to coring samples has been a problem ever since coring sampling began. Often this is from the fragility of certain formations (sands, for example) being sampled. Other times, the act of coring itself affects the core samples (e.g., biscuitting). One new recognized factor affecting core recovery comes from coring at extreme depths in scientific drilling. During IODP Expedition 343, J-FAST, D/V Chikyu drilled and cored to 7760.5 mBRT. An experiment to collect borehole temperature and pressure data was attempted by running an empty inner core barrel holding 3 pressure and temperature data recorders. Although the temperature experiment failed, pressure data indicated that the inner core barrel experienced severe elastic shock when recovered by the core line winch cable. The elastic response delay of the core line winch cable, and subsequent bouncing of the core barrel as it is being recovered to the drill floor are examined; methods of minimizing this damage are offered. This becomes more important as the Center for Deep Earth Exploration and D/V Chikyu prepare for drilling and sampling the Nankai megasplay fault/plate boundary estimated to lie at 7500 mBRT.
Year of Publication: 2015
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 30 Engineering Geology; Expedition 343; Expeditions 343/343T; Integrated Ocean Drilling Program; Japan Trench; Japan Trench Fast Drilling Project; North Pacific; Northwest Pacific; Pacific Ocean; West Pacific
Coordinates: N375619 N375620 E1435449 E1435447
Record ID: 2016080177
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