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MINERALOGICAL STUDIES OF THE HYDROTHERMAL SYSTEM IN NEWBERRY VOLCANO DRILL HOLE 2, OREGON.

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Abstract

Studies of secondary mineral distribution, whole-rock chemical compositions, isotopes, and fluid inclusions are being conducted on the core from Newberry Volcano drill hole 2. Rocks from the drill core are divided into 3 major intervals on the basis of their alteration pattern, which is controlled by rock permeabilities, primary lithologies, and temperatures. Incomplete alteration of pumice-rich lithic tuff layers in the upper part of the altered section and lack of self-sealing in fractures of most lava flows suggest that the hydrothermal system is young. Most of the secondary minerals could have been formed at temperatures near those present today; maximum measured temperature was 265 degree C at the bottom of the hole. Fluid inclusions indicate that past temperatures in the deeper part of the drill hole may have been as much as 100 degree C hotter than presently measured temperatures.

Additional Publication Details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Title:
MINERALOGICAL STUDIES OF THE HYDROTHERMAL SYSTEM IN NEWBERRY VOLCANO DRILL HOLE 2, OREGON.
ISBN:
0934412588
Volume
8
Year Published:
1984
Language:
English
Publisher:
Geothermal Resources Council
Publisher location:
Davis, CA, USA
Larger Work Title:
Transactions - Geothermal Resources Council
First page:
125
Last page:
128
Conference Title:
Geothermal Energy: Bet on It! Geothermal Resources Council 1984 Annual Meeting.
Conference Location:
Reno, NV, USA