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Frontiers in Geology and Ore Deposits of Arizona and the Southwest

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Frontiers in Geology and Ore Deposits of Arizona and the Southwest FRONTIERS IN GEOLOGY AND ORE DEPOSITS OF ARIZONA AND THE SOUTHWEST Arizona Geological Society and the University of Arizona 1986 Symposium FIELD TRIP GUIDEBOOK #8 Mesozoic Through Miocene Low-angle Tectonics and Related Mineralization. Harguahala-Granite Wash­ Buckskin Mountains. West Central Arizona March 21-23, 1986 Leaders: J. Spencer and S. Reynolds (Az.BGMT) and N. Lehman (Consul­ tant) Coordinator: J. Welty (AzBGMT) ARIZONA GEOLOGICAL SOCIETY TUCSON, ARIZONA Cover preparation by Beverly Morgan, modified from J. Mehulka and P. Mirocha, AGS Digest Volume XVI ARIZONA GEOLOGICAL SOCIETY P.O. BOX 40952, UNIVERSITY STATION TUCSON, ARIZONA 85719 To: Field Trip Participants Welcome to Arizona and the 1986 Arizona Geological Society Symposium "Frontiers in Geology and Ore Deposits of Arizona and the Southwest. 11 As field trip chairman I would like to wish you an enjoyable and informative con­ ference and a worthwhile field trip experience. The field trip committee set out many months ago to provide field expo­ sure to a broad spectrum of geological disciplines. The results include trips to recent precious-metal discoveries, areas of new and developing stratigraph­ ic and structure concepts, industrial mineral resources, lithologic features significant to the petroleum potential in the Southwest, geologic hazards in the community, and an opportunity to attend trips from previous Arizona Geo­ logical Society meetings. We hope you find your chosen field trip as exciting as we intended. At this time of very limited support from industry, it is especially im­ portant to acknowledge the personal efforts of so many. I include in those the planning and follow through of the field trip committee, the many hours of preparation by the trip leaders, and the commitment of the trip coordina­ tors to a smooth-running trip. A special thanks goes to Maggie Morris of the University of Arizona Conference Department for the transportation, lodging, and meal arrangements. Please enjoy the Southwest and remember this week of field trips and meetings as a step toward the frontiers of the future. Best regards, Parry D. Willard Field Trip Chairman Field Trip Committee Annan Cook Norm Lehman Beverly Morgan Jon Spencer Erick Weiland Joe Wilkins Jr. Jan Wilt ITINERARY FIELD TRIP 8 MESOZOIC THROUGH MIOCENE LOW-ANGLE TECTONICS AND RELATED MINERALIZATION, HARQUAHALA-GRANITE WASH-BUCKSKIN tvlOUNTAINS, WEST-CENTRAL ARIZONA Leaders: Jon C. Spencer and Steven J. Reynolds (AzBGMT) Norman E. Lehman (Consultant) Coordinator: John Welty (AzBGMT) Friday, March 21, 1986 6:00 pm Depart from University of Arizona, front of Student Union 6:00 pm Travel to Wickenburg, Ariz. 9:30 pm Arrive and check in at Rancho Grande Motel, Wickenburg, Ariz. ( 602-684-5445) Saturday, March 22, 1986 8:00 am Check out and depart from Wickenburg 9:00 am "S" Mountain stop, western Harquahala Mountains 10:45 am Calcite mine stop 12:00 noon Lunch* at Calcite mine 1:30 pm Northern Granite Wash Mountains stop 5:30 pm Arrive at Kasbah Motel,* Parker, Ariz., (602-669-2123) 6:30 pm Dinner at Los Argos Restaurant* Sunday, March 23, 1986 8:00 am Check out and depart from Parker 8:30 am Mineral Hill and vicinity stop (western Buckskin Mountains) 10:30 am BCC mine stop 12:00 noon Lunch* at BCC mine 12:30 pm Clara Peak stop 2:30 pm Lincoln Ranch Basin stop 4:30 pm Return trip to Tucson 9:00 pm Arrive in Tucson, with stops at Holiday Inn (Broadway) and University of Arizona *Included in fees. Drivers: John Welty Peter McGaw David Richards Ann Bykerk-Kauffman Raul Diaz Arlene Anderson 8. Harquahala~Granite Wash-Buckskin Mountains Western Arizona (March 21, 22 & 23) March 11, 1986 Reel: Name: H Hash 8. $115: 37 Joe Bartolino 1 100 Edward Bloomstein 1 172 Bruce Bryant 1 87 Richard Chamberlin 1 225 Jeff Chambers 1 143 John F. Childs 1 89 Edward Chipp 1 25 Robert L. Clayton 1 80 Dr. Hugh W. Dresser 1 120 Locke Goldsmith 1 106 Jack C. Hamm 1 21 Anthony H. Hauck,III 1 174 Robert Hill 1 51 Penny Hobbie 1 198 Brenda Houser 1 221 Laurel Jensen 1 147 David P. Jones 1 118 Paul Kallock 1 234 Richard A. Kirkham 1 220 Susan Kohler 1 119 James Logan 1 160 M. Myo Min 1 190 Marlon A. Nance 1 96 Richard Nickelsen 1 168 John Proffett 1 124 Steve Rivera 1 31 Dan Strachan 1 Page 1 FRONTIERS IN GEOLOGY 8. Harquahala~Granite Wash~Buckskin Mountains Western Arizona (March 21, 22 & 23) Marc·h 11, 1986 Rec#: Name: H \~ash 8. $115: 6 William H. Wilkinson 1 Norm Lehman Grand Tota 1 28 Steve Reynolds ---------------- Jon Spencer John ~'Jel ty David Richards Raul Diaz Peter McGaw Ann Byke~k-Kauffman Arlene P._nderson Page 2 FIELD TRIP 8 MESOZOIC THROUGH MIOCENE LOW-ANGLE TECTONICS AND RELATED MINERALIZATION, HARQUAHALA-GRANITE WASH-BUCKSKIN MOUNTAINS, WEST-CENTRAL ARIZONA March 21-23, 1986 Leaders: Jon C. Spencer (Arizona Bureau of Geology and ~.Hneral Technology Steven J. Reynolds (Arizona Bureau of Geology and Mineral Technology) Norman E. Lehman (Consultant) Coordinator: John Welty (Arizona Bureau of Geology and Mineral Technology) THIS PAGE INTENTIONALLY BLANK Arizona Geological Society Digest Volume XVI, 1986 FIELD TRIP GUIDE TO SELECTED PARTS OF THE HARQUAHALA, GRANITE WASH, AND BUCKSKIN MOUNTAINS, WEST-cENTRAL ARIZONA Jon E. Spencer and Stephen J. Reynolds Arizona Bureau of Geology and Mineral Technology 845 N. Park Ave., Tucson, AZ 85719 Introduction DAY .!_:_ Harquahala and Granite Wash Mountains This two-day field-trip guide is intended to provide the reader with a guide to selected areas of MILE the Harquahala, Granite Wash, and Buckskin Mountains POST COMMENTS that are illustrative of regional geologic relation­ ships and styles of mineralization. All field-trip stops, with the possible exception of stop 3 (Fig. 1), Intersection of U.S. highways 60, 89, and 93 are accessible by 2-wheel-drive vehicle with good in downtown Wickenburg. Proceed west under clearance. Some of the field-trip stops are at;· bridge on highway 60 to Los Angeles. patented or unpatented claims, and it is advisable to obtain permission to enter these areas. · 107.6 Intersection with Vulture Mine road near The first day is focused on the geology of Meso­ (3 . 4) major shopping center. Continue straight. zoic thrust faults in the Harquahala, Little Harqua­ hala, and Granite Wash Mountains. These ranges 105.0 Vulture Peak, highest point in Vulture Moun­ contain the most extensive exposures of stacked Meso­ (2.6) tains, is visible in distance to south of zoic thrust faults known in Arizona (Reynolds et al., road. Vulture Mountains are composed of 1980, this volume; Richard, 1982, in prep.; Spencer et northeast-dipping middle Tertiary volcanic al., 1985). With minor exceptions, the thrusts are and sedimentary rocks and underlying Proter­ southwest, south, and southeast directed. The struc­ ozoic crystalline rocks and Upper Cretaceous turally lowest Hercules thrust, which is exposed in Wickenburg Granodiorite (Rehrig et al., the western Harquahala, Little Harquahala, and Granite 1980) . Wash Mountains, places Precambrian and Jurassic crystalline rocks over moderately to steeply dipping, 103.0 Black Mesa, located to north side of road, southeast-facing sections of Paleozoic and Mesozoic (2 . 0) is capped by a gently dipping basalt that metasedimentary and metavolcanic rocks. All of the unconformably overlies the til ted Vulture field-trip stops on the first day are at outcrops volcanics and has been dated at 13.5 Ma along the Hercules thrust or related, subsidiary (Rehrig et al., 1980) thrusts. Mineralization along the Hercules thrust zone is either pre- to syn-thrusting (Calcite mine) or 102 . 1 Excellent exposures of low- angle normal is younger and was localized along the thrust zone (0 .9) fault that places tilted volcanics over (Yuma mine). Proterozoic crystalline rocks. The second day will be focused on the geology and mineralization of the Buckskin-Rawhide detachment 93 . 0 View straight ahead of Harcuvar Mountains , fault i n the Buckskin Mountains. The Buckskin-Rawhide ( 9 .l) the main mass of which is composed of mylon­ detachment fault is correlative with the Bullard itic and metamorphic rocks with a gently detachment fault at the east end of the Harcuvar and dipping fabric that defines the broad north­ Harquahala Mountains, and with the Wh i pple detachment east- trending Harcuvar Mountains antiform. fault in the Whipple Mountains of California. Top-to­ Agu i la Ridge, in the middle distance, is the-northeast displacement on the regional detachment composed of southwes&;dipping, ledge-forming fault has denuded one of the largest Tertiary mylonite middle Tertiary volcanics and sedimentary complexes in the North American Cordillera (Davis et rocks that depositionally overlie Proter­ al., 1980; Rehrig and Reynolds, 1980; Reynolds and ozoic crystalline rocks (Fig. 1; Reynolds Spencer, 1985 ; Spencer and Reynolds, this volume). and Spencer, 198't ). The regional Bullard Mineralization along and near the regional detachment detachment fault separates these upper-plate fault is _better developed and more extensive than in rocks from lower-plate mylonitic and meta­ any 0 iher Cordilleran met~mor~hic core complex morphic rocks of the Harcuvar Mountains, and (Wilkins -and ,HeidricR, 1982; Spencer and Welty, 1985, has accommodated approximately 40 to SO km 1986). Field-trip st;ps will be at areas · of minerali­ of relative northeastward transport of the zation along and below the detachment fault, at an upper-plate rocks (Reynolds and Spencer, exceptional exposure of the fault , and at a high-angle 1985 ). Smith Peak, the highest point in the fault that offsets the detachment fault. range, is marked by communication towers. 382 383 L() >-"' ;:: :I: ~ ., ;> Miles 0 5 10 15 ~--r-~r---~--~~ Kilometers 0 5 10 15 20 [I] UPPER-TERTIARY BASIN- FILL ~ UPPER - TERTIARY BASALT, GENERALLY FLAT LYING MIDDLE-TERTIARY VOLCANIC AND SEDIMENTARY ROCKS TERTIARY-CRETACEOUS (?) MYLONITIC GNEISS CENOZOIC-MESOZOIC INTRUSIVE ROCKS SYMBOLS P\hl MESOZOIC VOLCANIC AND SEDIMENTARY ROCKS .....__.._ .
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