Page 12 - Geologic Investigations in the Lake Valley Area, Sierra County, New Mexico

108° 107°30' 33°30'
C
NOGAL CANYON CAULDRON
PALOMAS BASIN
EMORY CAULDRON
Eastern
ring fracture zone of Emory cauldron
Laramide Cu-porphyry stock
H
K
Approximate structural margin of Emory cauldron
Buried
Love Ranch basin
Buried fault zone of Laramide Rio Grande uplift
LV
Eastern
ring fracture zone of Emory cauldron
0 5
10 KILOMETERS
Area of plate 1
33°00'
Figure 2. Major volcanic and tectonic features of Lake Valley and adjacent area (simplified from Callender and others, 1983). C, Chloride; H, Hillsboro; K, Kingston; LV, Lake Valley; LVF, Lake Valley fault; BF, Berrenda fault. Bar and ball on fault show downthrown side where known; sawteeth are on upthrown block of Laramide Rio Grande uplift.
numerous basalt flows in the Hillsboro area north of Lake Valley (Hedlund, 1977a). The Animas half-graben north of the Lake Valley study area (fig. 2) is the southern part of the 80 km long Winston graben, the westernmost extensional basin of the Rio Grande rift at this latitude.
The map area of plate 1 is near the southeast edge of the Emory cauldron and includes the Rio Grande rift-related Ani­ mas half-graben (Animas basin) (Seager and others, 1982; Harrison, 1990). Rocks exposed in the map area include Paleozoic carbonate and clastic rocks, scattered thin outcrops
Geology of the Lake Valley Area 3
BLACK RANGE
WINSTON GRABEN
LVF
BF
ANIMAS HALF-GRABEN