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Project Acronym: HOTSPOT | State: Completed | Expedition ID: 5036

ins.: 2010-11-15 01:00, 15 yrs ago
By: Scientists
Category: SnakeRiver
SnakeRiver

HOTSPOT: 2010-11-15

Drilling went well this past weekend. As of 1800 (11.14.10), ...
Science crew drying and logging core.

Drilling went well this past weekend. As of 1800 (11.14.10), the DOSECC drilling crew has cored to a TD of 1035 m, with a progress of 28.9 m in the past day. Some short core runs on Nov. 13 were overcome by some changes in drilling procedures. The core continues to provide a range of hydrothermally altered minerals and textures. The rock exhibites interspersed sequences of 30 cm to 1 m thick zones of aphanitic dense basalt with vesicle-rich zones that are infilled with white calcite rims, clay fillings, or blue-green opaline filling. Mineralized fractures in places are creamy white to lith tan and connect the mineralized vesicles, and nearly all fractures are mineralized. In places we observe subhorizontal fractures or voids that are mineralized with fine-grained botryoidal fill. Some of the vugs are filled with a fine-grained cubic black mineral? The temperature measured @ midday was 23.9 C at the depth of 1059.1 m. We are fairly confident that we have left the upper aquifer and entered into a deeper thermal zone.