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ins.: 2020-07-17 10:19; ( Age: 4 yrs )
By: Scientists
Category: COSC_

2020-07-16

This borehole is a thriller.
Changed to the 6 m core barrel (double tube)

This borehole is a thriller. Small details often cause long delays. After the change to the 6 m core barrel (double tube), however, overall drilling performance has increased and we get 6 m of very nice drill core every 4 hours. The invention of the day (by the night shift): We now pump out the entire 6 m of core into HQ3 liners without breaking the core barrel in the middle. At ~1925 m, we are still drilling through the volcanic sequence that we assume is equivalent to the Dala Porphyries farther south. It is interrupted only by a 150 m thick dolerite intrusion. Highest priority is to sample the entire sequence and its contact to the Svecofennian age(?) basement. We reached the depth of the first of the lowermost two reflectors. Do they represent another dolerite or are they related to the base of the volcanic sequence?