Tell u r i c prof i1es across t h e Darrough Known Geothermal Resource Area, Nevada ci 4 L BY D Harold Kaufniann U.S. Geological Survey . Open-file Report No. 76-286 1976 r ,. I \ \, *\. i - - i -1' .L T h i s r e p o r t is preliminary and h a s n o t b e e n edited o r reviewed f o r conformity w i t h U.S. Geological Survey standards and nomenclature. ,- -. ., , \ .- DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency Thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best available original document. .. TELLURIC PROFILES Darrough, Nevada Three t e l l u r i c p r o f i l e s were completed across the Darrough, Nevada K.G.R.A. One-traverse crossed through t h e c e n t e r of the a r e a from west t o e a s t , a n o t h e r n e a r the south boundary from west t o e a s t , and one traverse n e a r the center from s o u t h t o north. map f o r e x a c t p o s i t i o n s . See d a t a and l o c a t i o n Two five-hundred metre lines were used i n a l i n e a r a r r a y , g i v i n g a s t a t i o n spacing o f one-half km i n t e r v a l . component between three c o l i n e a r e l e c t r o d e s was used. Only one The array was, leap- frogged along a s t r a i g h t p r o f i l e line t o obtain r u n n i n g r a t i o s of e l e c t r i c f i e l d amplitudes, a l l referenced back t o the fir,st d i p o l e l o c a t i o n , -The s i g n a l was bandpassed fi1t.ered t o limit the p e r i o d t o a 10 t o 60 second range. The d a t a were recorded on an x-y p l o t t e r and the s l o p e of the l i n e is proportional t o the r a t i o - o f the e l e c t r i c f i e l d amplitudes observed between the two dipoles. The p r o f i l e s for the west t o e a s t t r a v e r s e s a r e shown a t t h e tob o f the l o c a t i o n map and the sooth t o n o r t h p r o f i l e i s along t h e west edge o f the map. The south t o n o r t h t r a v e r s e p a r a l l e l e d the mountain range'and g i v e s some i n d i c a t i o n of less r e s i t i v e s t r u c t u r e f e a t u r e s a t d e p t h , which may be i n d i c a t i v e of the east dipping f a u l t (Ferguson and C a t h c a r t , 1954). The c e n t r a l p r o f i l e also shows a low value n e a r the west end o f the p r o f i l e which could be related t o the f a u l t i n t h a t a r e a , t h e r e being two high points on either s i d e of t h e h o t s p r i n g s &rea would i n d i c a t e a perched low resist i v i t y zone r e l a t e d t o t h e h o t s p r i n g s a l t e r a t i o n a t depth w i t h t h e l o w e s t t p a r t of the p r o f i l e on t h e east end probably reflecting the deeper b a s i n sediments. The A.M.T. 27 Hz, t e l l u r i c l i n e n-S r e s i s t i v i t y map s u p p o r t s 1 . .. ~ - . . the tel1,uric p r o f i l e very well from t h e Darrough hot springs eastward by i n d i c a t i n g low r e s i s t i v i t y over the hot springs w i t h a higher r e s i s t i v i t y ridge s e p a r a t i n g the basin sediments from the area o f the h o t springs. . The s o u t h p r o f i l e does show a moderate change i n r e s i s t i v i t y just e a s t of highway 84 n e a r Carvers s t a t i o n , which would be i n the proper l o c a t i o n t o intersect the east dipping fault. A f o u r t h t r a v e r s e was attempted near the north boundary, b u t except for t h e f i r s t two west s t a t i o n s , we were unable t o obtain a s i g n a l above the noise level. I . . . .. .. 2 .. . .. . .. . - .. . Tell uri c Profi 1es-Darrough , Nevada September 18-22, 1975 Station 1 E l e c t r i c - f i e l d Ratios -~ ~ Central t r a v e r s e (West-East) ~~~ South -N o r t h trave rs e (South-North) Angle y/x r a t i o Angl e 1 35O 1.36 43.5' 2 45O 1 .oo 3 47' 4 y/x r a t i o South ern t r a v e r s e (West -Eas t ) Angle y/x r a t i o 1.11 56' 0.68 53.0' 0.75 ( 34' ) (1.49) 0.93 40.0' 1.18 76' 0.25 38' 1.28 36.0' 1.38 390 1.24 5 45' 1io0 44.0' 1.03 30' 1.74 6 45' 1 .oo 42.0' 1.11 7 37' 1.33 51 .O' 0.81 8 50' 0.84 46.0' 0.96 9 51 0.81 5p.'5 0.82 10 49' 0.87 38.0' 1.28 11 (54') (0.73) 49.0' 0.87 12 44' 1.03 55.0' -. 0.70 13 45.0' 1 .oo 14 45.0' 1 .oo - ' i I 3 Scale: 1 :62500 Telluric profile with data and location map, Darrough Hot Springs KGRA, Nevada. t 4 4
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