574 



STRUCTURAL GEOLOGY OF NORTH AMERICA 



Intrusive Bodies of Mineral Districts in Great Basin 



Diorite and 

 Andesite 



Pearce (1) 

 Superior (2) 



Mogollon (29) 

 Steeple Rock (30) 

 Pinos Altos (31) 



Tonopah (39) 

 Aurora (40) 

 Tuscarora (41) 

 Fairview (42) 

 Divide (43) 

 Virginia City (44) 

 Searchlight (45) 

 Eldorado (46) 

 Tenabo (47) 

 Lewis (48) 



Granodiorite Quartz 



Monzonite, Monzonite, 



Latite, Dacite 



Arizona 



San Manuel (3) 

 Christmas (4) 

 Big Bug (5) 

 Johnson (6) 

 Miami (7) 

 Ajo (8) 

 Tombstone (9) 

 Silver Bell (10) 

 Castle Dome (11) 

 Courtland Gleeson (12) 

 Patagonia (13) 

 Helvitia (14) 

 Harshaw (15) 

 Bagdad (16) 

 Twin Buttes (17) 



New Mexico 



Kingston (32) 

 Central (33) 

 Magdalena (34) 

 Tyrone (35) 

 Hillsboro (36) 

 Chloride Flat (37) 



Nevada 



Tybo (49) 



Copper Canyon (50) 

 Candelaria (51) 

 Gold Acres (52) 

 Ely (53) 

 Yerington (54) 

 Goldfield (55) 

 Eureka (56) 

 Copper Basin (57) 

 Austin (58) 

 Mill City (59) 

 Getchell (60) 

 Cherry Creek (61) 



Granite, Rhyolite 



Morenci (18) 

 Bisbee (19) 

 Oatman (20) 

 Kofa (21) 

 Mammoth (22) 

 Jerome (23) 

 Ray (24) 

 Chloride (25) 

 Arivaipa (26) 

 Congress (27) 

 Aqua Fria (28) 



Lordsburg (38) 



Pioche (62) 

 Goodsprings (63) 

 Jarbidge (64) 

 Bristol (65) 

 Silver Peak (66) 

 Wonder (67) 

 Rochester (68) 

 Unionville (69) 

 National (70) 

 Seven Troughs (71) 

 Bullfrog (72) 

 Delamar (73) 

 Hamilton (74) 











Granodiorite Quartz 





Diorite and 



Monzonite, Monzonite, 





Andesite 



Latite, Dacite 



Granite, Rhyolite 





Nevada 



Manhattan (75) 

 Round Mtn. (76) 

 Bullion (77) 





California 





Bodie (78) 



Cerro Gordo (79) 



Calico (82) 





Randsburg (80) 



Blind Spg. Hill (83) 





Mohave (81) 



Ludlow (84) 

 Darwin (85) 





Utah 





Park City (86) 



Stockton (87) 



Ophir (91) 





San Francisco (88) 



Mercur (92) 





Gold Hill (89) 



Bingham (93) 





Lucin (90) 



Marysvale (94) 

 Tintic (95) 









gren et ah, 1910). They are intruded into Precambrian granites and schists 

 and all parts of the Paleozoic and Mesozoic stratigraphic sequence, and 

 take the form of stocks, sills, and dikes. The volcanics are basalts, an- 

 desites and rhyolites, with the order of eruption generally, rhyolite, 

 andesite (or latite), rhyolite again, and finally basalt. 



Possibly the largest Laramide or Tertiary intrusive in Utah, Nevada, 

 Arizona, or New Mexico is that of the Sierra Blanco in Lincoln County, 

 New Mexico. It is probably connected underground with plutons to the 

 north in the Jicarilla Mountains and Gallinas Mountain and to the east in 

 the Capitan Mountains. The Sierra Blanco, Jicarilla, and Gallinas plutons 

 extend a distance north-south of 70 miles, and the Sierra Blanco pluton 

 itself has a maximum width of 15 miles. The Capitan pluton extends 20 

 miles in an east-west direction and about 5 miles in a north-south direc- 

 tion. The major intrusive mass, the Sierra Blanco, and the Jicarilla, have 

 penetrated a basin downwarp containing Cretaceous strata not much 

 larger than the exposed plutons. The Gallinas and Capitan plutons have 



