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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 u Proterozoic Geology of the Sierra Ancha-Tonto Basin­ Mazatzal Mountains Area. Central Arizona March 17-19, 1986 Leaders: C. Conway and C. Wrucke (U.S.G.S.) Coordinators: P. Swift 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 THIS PAGE INTENTIONALLY BLANK ITINERARY FIELD TRIP 1 PROTEROZOIC GEOLOGY OF THE SIERRA ANCHA-TONTO BASIN­ MAZATZAL MOUNTAINS AREA, CENTRAL ARIZONA Leaders: Clay M. Conway and Chester T. Wrucke (USGS) Coordinators: Peter Swift (U of A) Monday, March 17, 1986 5:00 pm Meet at University of Arizona, in front of Student Union 5:00 pm Depart for Copper Manor Motel,* Globe, Ariz. (602-425-7124). Check in 7:00 pm Dinner (on your own) 8:00 pm Orientation meeting, Sundowner Room, Copper Manor rvfotel Tuesday, March 18, 1986 8:00 am Check out and depart Copper Manor Motel 8:00-12:00 noon Geology of the Sierra Ancha Mountains 12:30 pm Lunch* at Winter Camp near Diamond Butte 1:00-7:00 pm Geology of Diamond Butte area; travel to Payson 7:00 pm Arrive at Swiss Village Lodge,* Payson, Ariz., (602-474-3241) 7:30 pm Dinner at Swiss Village Inn* Wednesday, March 19, 1986 8:00 am Depart Swiss Village Lodge 8:00-12:00 noon Natural Bridge stop 12:00 noon Lunch* at Sycamore Creek, Mazatzal Mountains 1:00 pm McFarland Canyon stop 3:30 pm Conclusion of trip-Depart Mazatzal Mountains 7:00 pm Arrive in Tucson; stops at Holiday Inn (Broadway) and Uni­ versity of Arizona Campus. *Included in fees. Drivers: Peter Swift Richard Orr FRONTIERS IN GEOLOGY 1. Precambrian~Sierra Ancha Tonto Basin~Mazatzal Mountains (March 17, 18, and 19) March 11, 11 Rec#: Name: Pre· Cam 1. $130: l"'' .......- ., ... ~l't • ... ~-' -...... ~'1"'!-r-~ . ... ·-.- .. "'-· · ~--... .,~~1~-·fr· r _ ., . ...........• -.-~~- 7 1 · -,..;.""'."'---~, ~ , -a . r ·-· , , ..........";l' •t .., ._~, . , . .., .,;--.··, -:,·... ~ - ..........- ~ - ................., ....... ~-~. -,. ..- . , ... ~-~~ , ...-- , ..,.;-.o ... i1 126 Pau 1 E. Damon 1 77 Tom Foster 1 85 Robert C. Greene 1 15 Michael R. Pawlowski 1 32 John Petersen 1 146 G. Todd Ririe 1 251 Gordon W. Weir 1 130 Go-rdon Wieduwi 1t 1 209 Chet Wrucke 1 Clay Conway Grand Total 9 Peter Swift --------------------------------I Richard Orr Page 1 FIELD TRIP 1 PROTEROZOIC GEOLOGY OF THE SIERRA ANCHA-TONTO BASIN- MAZATZAL MOUNTAINS AREA, CENTRAL ARIZONA March 17-18, 1986 Leaders: Clay M. Conway (U.S. Geological Survey) Chester T. Wrucke (U.S . Geological Survey) Coordinators: Peter Swift (University of Arizona) THIS PAGE INTENTIONALLY BLANK Arizona Geological Society Digest Volume XVI, 1986 PROTEROZOIC GEOLOGY OF THE SIERRA ANCHA-TONTO BASIN- MAZATZAL MOUNTAINS AREA. ROAD LOG AND FIELD TRIP GUIDE Clay M. Conway1 and Chester T. Wrucke2 exposures of interesting stratigraphic and structural INTRODUCTION relations between the Proterozoic rocks and Paleozoic and Tertiary strata. A Proterozoic silicic volcano­ The purpose of this trip is, first, to exami~e hypabyssal complex, centered in the Tonto Basin area, some of the major rock units in the Middle Proterozo1c includes volcanic rocks of the Alder and Red Rock Apache Group and geographically and stratigraphically Groups, several hypabyssal rhyolite and granophyre associated rocks that were intruded by Middle Pro­ units and the Payson Granite. Most of the hypabyssal terozoic diabase, and, second, to study the 1 aye red units of this complex will not be visited on this sequences of Early Proterozoic sedimentary and vol­ trip, though one alternate stop is in granophyre. A canic rocks that underlie the Apache Group. Asbestos similar complex which underlies most of the northern and uranium deposits will be visited in the Sierra Mazatzal Mountains will also not be visited. Superb Ancha and altered and mineralized Early Proterozoic exposures of Early Proterozoic Mazatzal Quartzite and strata will be examined in the Mazatzal Mountains. intertonguing relation with the underlying Red Rock Rhyolite will be seen near Tonto Natural Bridge The trip begins at Globe (Fig. 1) and proceeds (travertine) at Pine Creek on the third segment of the northwest along Pinal Creek, past exposures of the trip. Apache Group and Ruin Granite, then over the divide into the southeastern end of the basin of Roosevelt The fourth part of the trip is frcxn Payson across Lake. From there the route turns north and follows the valley of Rye Creek into the central Mazatzal Arizona Highway 288 across ttie Salt River to the Mountains. A major Tertiary fault system bounding the Sierra Ancha, where the Apache Group, the Troy east side of the Mazatzal Mountains and a number of Quartzite, and diabase are found in many magnificent stepped faults below the Mogollon rim define an asym­ exposures from the high desert to pine forest. The metric graben. South of Payson, valley-fill sediments Apache Group, widely exposed in central and southern lie unconformably on the Early Proterozoic Gibson Arizona, is more completely represented and has fe~er Creek batholith, a plutonic suite which is intruded by structural complexities in the Sierra Ancha reg10n Payson Granite and which hosts a small gold-mining than elsewhere in the state. The Sierra Ancha is district. Stops in the central Maz<~tzal Mountains underlain almost wholly by these rocks, which nearly will be to examine voleanic and volcaniclastic strata everywhere are approximate] y fl at-1 aying, reflect i~g of the middle and upper parts of the Alder Formation the location of the Sierra Ancha as structurally 1n and Red Rock Rhyolite. Of interest will be hydro­ the Colorado Plateau province. Paleozoic cover, thermally altered strata, exhalative rocks, and except in the vicinity of Aztec Peak at the crest of spatially associated mineral deposits of several the Sierra Ancha and one locality west of the crest, types. has been eroded back to the Mogollon Rim far to the north. From the forested uplands of the Sierra Ancha, Some isotopic ages reported in this paper are 20 the route descends northward to Young, in Pleasant to 30 m.y. younger than reported in the literature in Valley. order to give a very approximate r.orrection for recent changes in decay constants. Metric units are used The broad Pleasant Valley depression owes its herein except that route road distances are in mi 1 es presence to deep weathering and erosion of the Early and elevations are in feet. Geologic names in this Proterozoic granite of Young. Westward from Young the report are from literature cited and from a revision route leads into the Diamond Butte area of the upper in preparation by the authors. Tonto Creek drainage basin. Exposures here of vol­ canic and volcaniclastc rocks of the Early Proterozoic Alder and Red Rock Groups are among the best in the PART I. GLOBE TO DIAMOND BUTTE Tonto Basin-Mazatzal Mountains region. Mileage Seg. Cum. The second part of the trip loops from Young around the upper Tonto Creek drainage by ascending the 0.0 o.o Intersection of US Highway 60 and Arizona Mogollon Rim then dropping down to the west to Payson Highway 88. Tai 1 i ngs ponds from the In­ and Pine Creek. This portion of the trip affords spiration Consolidated Copper Co. Mine lie to the west. The mountains to the east 1 consist mostly of Middle Proterozoic rocks U.S. Geological Survey, 2255 Gemini Drive, of the Apache Group, Troy Quartzite, and Flagstaff, AZ 86001 2 diabase (Table 1), locally overlain by U.S. Geological Survey, 345 Middlefield Road, Menlo Paleozoic strata. These same rocks are Park, CA 94025 227 228 Figure 1. Topographic map of the region between Globe and the Mogollon Rim showing field trip route and stops. 229 exposed in the mountains to the west as forming diabase sills, which in aggregate are Early Proterozoic granite, early Ter­ at this end of the range exceed the thick­ tiary porphyries, and Miocene ash-flows. ness of the host sedimentary section.
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