Daily News
Project Acronym: LVEW | State: Completed | Expedition ID: 5024
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Long Valley LVEW: 1998-08-27 ˇ
We have almost 200 on Bit 14 and drilling
We have almost 200' on Bit #14 and drilling proceeds well. The drilling fluid now consists of bentonite, dry polymer, fine walnut shells, and soda ash in an effort to control lost circulation.
Long Valley LVEW: 1998-08-26 ˇ
We continue to drill ahead in pelitic hornfels The
We continue to drill ahead in pelitic hornfels. The formation is very fractured and sheared with high-angle open hydrothermal veins, brecciation, and mylonitic zones.
Long Valley LVEW: 1998-08-25 ˇ
Ran core tube data logger at 8813 bottomhole inclination
Ran core-tube data logger at 8813'; bottomhole inclination is at 13.2 degrees. Cannot determine an accurate bottomhole temperature due to cooling from lost circulation/fresh mud.
Long Valley LVEW: 1998-08-24 ˇ
At 8780 the calcareous bands in the metapelite contain
At ~8780', the calcareous bands in the metapelite contain wollastonite, cordierite, and garnet porphyroblasts; the graphitic and siliceous bands now contain hornblende. The metamorphic grade has increased to a pelitic hornfels.
Long Valley LVEW: 1998-08-23 ˇ
We continue to encounter banded graphitic metapelite showing increasingly ductile deformation.
We continue to encounter banded graphitic metapelite showing increasingly ductile deformation.
Long Valley LVEW: 1998-08-22 ˇ
The drill continues to encounter ductilely deformed metapelite
The drill continues to encounter ductilely deformed metapelite
Long Valley LVEW: 1998-08-21 ˇ
The drill continues to encounter banded graphitic metapelite It
The drill continues to encounter banded, graphitic metapelite. It is brecciated and contains numerous fault gouge zones, resulting in very short core runs
Long Valley LVEW: 1998-08-19 ˇ
Drilling continues slowly but with some improvement in rate of coring, and fewer fractures...
Drilling continues slowly but with some improvement in rate of coring, and fewer fractures encountered
Long Valley LVEW: 1998-08-18 ˇ
Slow going as we continue to encounter open fractures
Slow going as we continue to encounter open fractures (lined with exquisite quartz crystals) in extremely hard quartzite. Rate of penetration is averaging less than 1 ft per hour.
Long Valley LVEW: 1998-08-17 ˇ
We continue to encounter very hard quartzite. Lost circulation at about 8525'
We continue to encounter very hard quartzite. Lost circulation at about 8525'
Long Valley LVEW: 1998-08-16 ˇ
Bit 10appears to be worn out after coring only
Bit # 10appears to be worn out after coring only 40', mostly of quartzite. We're tripping out to replace the bit.
Long Valley LVEW: 1998-08-15 ˇ
Most of the day was spent tripping to change bits. The science crew rested.
Most of the day was spent tripping to change bits. The science crew rested.
Long Valley LVEW: 1998-08-14 ˇ
Alternating layers of siliceous metapelite and intrusive material were encountered.
Alternating layers of siliceous metapelite and intrusive material were encountered.
Long Valley LVEW: 1998-08-13 ˇ
Continued coring metapelite with more intrusions than before Today
Continued coring metapelite with more intrusions than before. Today was a record for site tours, with a total of four.
Long Valley LVEW: 1998-08-12 ˇ
Bit # 8 only survived for 115', victim of the hard, silicified metamorphic and intrusive rocks.
Bit # 8 only survived for 115', victim of the hard, silicified metamorphic and intrusive rocks.
Long Valley LVEW: 1998-08-11 ˇ
Tripped into well with a new bit (#8) and ran a temperature log. Bottom Hole Temperature is
Tripped into well with a new bit (#8) and ran a temperature log. Bottom Hole Temperature is
Long Valley LVEW: 1998-08-10 ˇ
Another good day of coring with over 100'.Continued interfingered metapelite and silicic intrusion
Another good day of coring with over 100'.Continued interfingered metapelite and silicic intrusion
Long Valley LVEW: 1998-08-09 ˇ
The drill continues to penetrate interfingering layers of siliceous
The drill continues to penetrate interfingering layers of siliceous metapelite and a felsic intrusive rock containing the alteration minerals actinolite and epidote.
Long Valley LVEW: 1998-08-08 ˇ
We encountered a very light colored fine grained felsic
We encountered a very light-colored, fine-grained felsic intrusion between the depths of 7906 and 7922 ft. More banded siliceous metapelite followed.
Long Valley LVEW: 1998-08-07 ˇ
Began bit trip at 1400 preformed minor repairs to
, , Began bit trip at 1400, preformed minor repairs to the top drive power unit and plan, to be back in the hole by early morning.,