Geological Survey Professional Paper, Volume 1141

Front Cover
U.S. Government Printing Office, 1981 - Geology
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Contents


Diagram showing hypothetical open fractures in structural highs produced by horizontal extension and by horizontal compression
20
Geologic map and cross section of diapiric structure associated with unproductive exploratory wells in the Geysers steam field
21
Map showing age and distribution of volcanic rocks central Coast Ranges
26
Geologic map and outline of present magma chamber
28
Fault map showing Clear Lake Volcanics
30
Maps showing distribution of young volcanic rocks Clear Lake area
32
SiO2 variation diagrams for Clear Lake Volcanics and other rocks
38
Graph showing patterns of rareearth elements
39
Location map of samples for potassiumargon dating
49
KAr dates and analytical data Clear Lake Volcanics
51
Generalized correlation chart showing Clear Lake Volcanics
52
Map showing composite of figure 56 114
56
Graph showing volumes of lava erupted during each period of activity
57
Map showing sample localities in the Clear Lake Volcanics
62
Rubidium and strontium concentrations and 87Sr86Sr ratios Clear Lake Volcanics
63
25 87Sr86Sr ratios versus KAr ages
64
Map of Clear Lake area showing prominent topographic features and sample localities
68
Paleomagnetic results and KAr ages
69
30 Stratigraphic relations KAr ages and magnetic polarity of units related to Jaramillo normalpolarity event
70
Average remanent magnetization directions for older lavas of Mount Hannah area
71
Average remanent magnetization directions showing sequence of eruption for andesite of SplitTop Ridge andesite of Poison Smith Spring and dacite ...
72
Average remanent magnetization directions for localities sampled in rhyolite of Alder Creek
75
Four types of strongfield thermomagnetic curves
76
Magnetic properties of Clear Lake volcanic rocks
77
Histograms showing NRM intensity susceptibility and Koenigsberger ratio for rock types of Clear Lake Volcanics
78
Chart showing polarity and KAr ages of Clear Lake Volcanics
79
Map showing VGP positions for transitional lavas from Clear Lake and MatuyamaBrunhes polarity transition from LakeTecopa Calif
80
39 Residual gravity
84
Upwardcontinued magnetic field
85
Pseudogravity derived from filtered aeromagnetic data
87
Generalized geology and apparent resistivity
89
Generalized horizontal ground movement 197277
92
Gravity changes between July 1974 and February 1977
93
Diagram of proposed evolution of Clear Lake Volcanics from severed limb of subducting Farallon plate
94
Generalized geologic map of the GeysersClear Lake geothermal area
98
Tectonic setting and magma sources by B Carter Hearn Jr Julie M DonnellyNolan and Fraser E Goff
99
Geographic information on and periods of operation of the seismic stations located south of Clear Lake
100
Seismogram showing two typical teleseisms recorded by telemetered network in the GeysersClear Lake region
101
Illustrations showing computer manipulation of seismograms
102
List of teleseisms
104
Graphs showing variation of relative residuals as a function of distance and azimuth
107
Relative residual contour maps
108
Profile of northwest and southeast residual values and gravity along line AA HO 56 Map showing calculated depth to bottom of anomalous body
112
Regional geology and structure of the GeysersCastle Rock Springs geothermal area
118
Regional geology and structure of study area
119
Strontium isotopes in the Clear Lake Volcanics by Kiyoto Futa Carl E Hedge B Carter Hearn Jr and Julie M DonnellyNolan U
120
Stacked seismic section along line two showing reflection profile and twoway traveltime
121
Geologic section along reflection line two
124
Stacked seismic section along line one showing reflection profile and twoway traveltime
125
Geologic section along reflection line one
128
Seismicity of the GeysersClear Lake region by C G Bufe S M Marks F W Lester R S Ludwin and M C Stickney U S Geologi
129
Preliminary epicenters of earthquakes north of San Francisco Bay 196978
131
Earthquake events in the Geysers geothermal area
132
Two main clusters of microearthquakes recognized at The Geysers
134
Graph of generalized horizontal ground movement in the GeysersClear Lake area 197277
146
Graph of changing rates of ground movement on lines spanning the geothermal production area
147
Generalized geologic and structural map of the GeysersClear Lake area showing location of seismic array
150
Attenuation of teleseismic P waves in the GeysersClear Lake region by Chi Yuh Young and Ronald W Ward University of Texas
151
Diagram showing sample Pwave seismograms recorded by the GeysersClear Lake array for three events
152
Diagram of teleseismicP wave incident beneath a model geothermal system
153
Graphs showing power density spectra and spectral ratios from the GeysersClear Lake array for a typical event
154
Graph showing dominant frequencies of P phases along northwestsoutheast line
155
Maps showing twodimensional contoured surface fitted to averaged it
156
Graph showing simplified Q model for the GeysersClear Lake area
158
Bouguer gravity map of the GeysersClear Lake area over area of seismicattenuation study
159
A detailed gravity survey of the Wilbur Springs area California by John M Harrington and Kenneth L Verosub University
161
Map showing location of Wilbur Springs study area and Clear Lake volcanic field
162
Map showing generalized geology of Wilbur Springs quadrangle
163
Residual Bouguer gravity map of Wilbur Springs area
164
Seismicrefraction measurements of crustal structure near Santa Rosa and Ukiah California by David H Warren U S Geological
167
Map showing locations of seismic recording stations shotpoints and faults Santa RosaUkiah area
168
Traveltime data
169
Traveltime plots and velocity profile for southwesterly shots
171
Traveltime plots and velocity profile for northeasterly shots
172
Equations of traveltime curves
173
Traveltime plot for northeasterly profile through The Geysers
174
Record sections for Roblar shotpoint
175
Record sections for Geysers shotpoint
178
Plots of time squared versus distance squared for Roblar and Skaggs Springs shotpoints
180
Chemical analyses of waters from springs and wells in the Clear Lake volcanic area by J M Thompson F E Goff and J M
183
Chemical analyses of thermal water samples from Clear Lake volcanic field
184
Variability and sources of hydrogen sulfide and other gases in steam at The Geysers by Charles A Brook U S Geological Survey
193
Map showing generalized geologic setting of the Geysers steam field
194
Diagram of conceptual model of fluid movement in a vapordominated geothermal system
195
Initial gas concentrations in steam entries encountered during drilling of wells in the southern part of the Geysers steam field
197
Average incoming H2S concentrations at full steam flow for generating units at the Geysers powerplant
198
Gases from springs and wells in the GeysersClear Lake area by Nancy L Nehring U S Geological Survey
205
Majorgas analyses of the GeysersClear Lake area
206
Residualgas analyses of the GeysersClear Lake area
207
Chromatograms of hydrocarbon gas analyses
208
Carbon13 isotope values for carbon dioxide gas and dissolved carbon species in springs and wells in the GeysersClear Lake region
211
Graph showing carbon isotope composition of samples from the GeysersClear Lake region compared with isotopic compositions of possible sources
212
Generalized map of Clear Lake and vicinity showing location of sample sites
215
Chemical analyses of spring water along the shore of Clear Lake
217
Map showing generalized regional geology of northern Coast Ranges of California and location of the Geysers steam
218
Map showing location of Clear Lake and core sites
219
Descriptions of cores from Clear Lake
221
Diagram showing ashbed correlations in eight cores from Clear Lake
222
Radiocarbon dates from Clear Lake cores 4 and 7
223
Chart showing agedepth relation in cores 4 and 7 Clear Lake and in Lake Biwa Japan
224
Diagrams showing oak pine and TCT pollen frequencies for cores 4 and 7
225
Diagram showing oakpollen frequency curve from Clear Lake and 18O curve from Pacific Ocean
228
Map showing fossilfish localities in the Cache Lower Lake and Kelseyville Formations Lake County Calif
231
Location specific distribution and listing of fossil fish parts recovered in the Cache Lower Lake and Kelseyville Formations
232
Specific distribution of fossil fish in the Cache Lower Lake and Kelseyville Formations and in cores from Clear Lake and presentday Clear Lake
234
Mercury analyses for cores 6 and 10 Clear Lake
240
Sample locations
253
Statistical size data for zircon samples Clear Lake
254

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