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Sell-0717 , Rincon Mountains, AGS Field Trip, Nov. 1971 , AZ, Pima Co. ,MILS

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Sell-0717 , Rincon Mountains, AGS Field Trip, Nov. 1971 , AZ, Pima Co. ,MILS CONTACT INFORMATION Mining Records Curator Arizona Geological Survey 416 W. Congress St., Suite 100 Tucson, Arizona 85701 520-770-3500 http://www.azgs.az.gov [email protected] The following file is part of the James Doyle Sell Mining Collection ACCESS STATEMENT These digitized collections are accessible for purposes of education and research. We have indicated what we know about copyright and rights of privacy, publicity, or trademark. Due to the nature of archival collections, we are not always able to identify this information. We are eager to hear from any rights owners, so that we may obtain accurate information. Upon request, we will remove material from public view while we address a rights issue. CONSTRAINTS STATEMENT The Arizona Geological Survey does not claim to control all rights for all materials in its collection. These rights include, but are not limited to: copyright, privacy rights, and cultural protection rights. The User hereby assumes all responsibility for obtaining any rights to use the material in excess of “fair use.” The Survey makes no intellectual property claims to the products created by individual authors in the manuscript collections, except when the author deeded those rights to the Survey or when those authors were employed by the State of Arizona and created intellectual products as a function of their official duties. The Survey does maintain property rights to the physical and digital representations of the works. QUALITY STATEMENT The Arizona Geological Survey is not responsible for the accuracy of the records, information, or opinions that may be contained in the files. The Survey collects, catalogs, and archives data on mineral properties regardless of its views of the veracity or accuracy of those data. UNITED STATES DEPAKTMENT OF THE INTERIOR GEOLOGICAL SURVE~I r Road log for Rincon Mountains field trip by Harald Drawes U.S. Geological Survey Denvar~ Colorado Handout for Arizona Geological Society 1971 i % ~: The Rincon Mountains field ~rip is planned to take place on 2 days, probably the second and third Sundays of November 1971~ Also~ a geologic talk on the Rincons is scheduled to be held at the usual meeting place on the intervening Tuesday. Field trip vehicle needs: We will travel bycar caravan~ which should be kept as short as possible. On the first day of the trip extra cars can be left at our meeting place. Small field vehicles a~ most sult~ble~ but all cars can make it except for the last mileo On the second day of the trip all cars are usable, except for short detours for which any field car will do, Other needs: Bring lunches and water, hiking boots~ copies of the Happy Valley quad (first day) and Rincon Valley and Bellota Ranch quads (second day). Hunting season may be on; although we wil! be in open coun=ry~ take your usual precautions. ~: We will meet in the field at erz~pinuous locatlons~ rather than in Tucson. Please make arrangements for sharln~ rides, a~d allow adequate time to drive to meeting places, On the first day we will meet at the Mescal- J-6 Ranch Road interchange on Interstate Highway 10 (about 8 miles west of Benson). Allow about 1 hour driving time beyond the Tucson City limits. See St,9.p_~Ifor further details. On the second day we will meet a~ the parking lot of Colossal Cave. Allow about 40 minutes driving time from Tucson. See StpD,~7, Meeting time: Let's meet at 8z30 a,m. on both days. O I 1 O Note: All road log mileages are scaled from the topo sheets° I will try to provide better ones later, or you may add them yourselves as we go along. The road log is designed to provide some flexibility° Depending on the size of the group and their particular interest, we can either see additional instructive areas or, with some additional walking, we can see more ideal exposures. First d Mile 0 STOP i (Meeting place, first day) Interstate Highway i0 interchange at the llescal-J-6 Ranch Road, about 8 miles west of Bensono Meet immediately north of overpass. Unneeded cars may be left here. Review of the major topographic and geologic features of the Rincon Mountains. The Rincons lie to the north-northwest and are about 8,500 feet high. The Little Rincon Mountains lie to the north and are only about 5,000 feet high° The San Pedro Valley, at about 3,300 feet, lies to the east and northeast. Today we shall concentrate on the geology of the northern part of the Little Rincons, which probably reflects what the rocks were like on top of the main Rincons in Pllocene-Pleistocene time. The Rincons and Little Rincons are much alike geologically; they are parts of a single large gneiss dome. The rocks of the core of the dome are a gneissic complex of Precambrlan intrusive and sedimentary rocks; those of the carapace are mainly of Paleozoic age but also include Precambrian granitoid rocks and Apache Group and Mesozoic sedimentary rocks. The carapace rocks are everywhere allochthonous; the core rocks are autochthonous or para-autochthonous. The allochthonous rocks consist of three main thrust plates. The lowest plate consists mai61y of metamorphosed Paleozoic rocks, the middle plate is of grano- diorite (Rincon Valley Granite of Acker, 1958), and the upper plate consists mainly of unmetamorphosed Paleozoic rocks. A large north-trending normal fault of Miocene(?) to Pleistocene age separates the Rincon block from the Little Rincon block. Since Miocene (?) time, the allochthonous carapace has been eroded from the uplifted Rincons; however, it is still preserved in the Little Rincons~ where we shall see it today. Immediately east of the San Pedro Valley, most of the rocks are of the carapace, but some of them appear to be autochthonous. Proceed by car northward toward Mescal and Happy Valley. 2 Mile 2.0 Turn west (left) along railroad. 2.5 Cross S.P. RR tracks, turn west (left) and, about i00 yards beyond crossing, turn north (right), following main road. 3.0 Junction. Turn east (right) toward Happy Valley. 4.0 To west (left) is movie set, last used for filming parts of "Dirty Little Willie." Cross extensive area underlain by basin-fill gravel, of Pliocene-Pleistocene age, capped by a well-developed red soil. 7.0 Ash Creek to northeast (right). One mile down the canyon there is an inferred thrust fault within Precambrian rocks of the core of the gneiss C dome; hence the use of the term "para-autochthonous" for these rocks° 8.0 STOP 2 Road cut to west (left). Two components of the gneiss dome complex are exposed here. The oldest component is the Pinal Schist, here with a gently southeastward-dipping foliation. It is cut by numerous small lit- par-lit sheets of aplite, which are probably related to a 2-mica quartz monzonite, to be seen at the next stop. 8.4 Mac Kenzie Ranch° A string of small tectonic slivers lies within the Precambrian rocks about a mile northeast of the ranch° Across the mountains to the east a small plate of Paleozoic rocks also lies faulted wi~lin the gneiss complex° I0 • 5 STOP__~3 Road cut to east (right). The youngest component of this part of the gneiss complex is exposed here. A sample from the gully to the south- west is dated by the K-Ar method as by R.F. Marvin, H.H. Mehnert, and Violet Merritt, U.S. Geological Survey (1971, written comPOund). Along the road for the next mile to the north, the quartz monzonite contains many inclusions of a coarsely crystalline gray porphyritic granodiorite, ~ich are assimilated to various degrees. We shall see this rock again in better preserved condition at the next stop. 12.5 Enter into Happy Valley. Note exposures of basin-fill gravel above road level. Descent into Happy Valley is on a younger tez~ace gravel° The basin- fill gravel is faulted against the Rincon Mountains to the west and in places its clasts include rocks of the carapace° The terrace gravel laps across the fault and consists entirely of rocks derived from the gneiss complex of the core. 3 O Mil_ee 15.5 Turkey Creek to left (north)° Note on passing the gentle westward dip of the basin-fill gravel, which is related to the normal faulting between the two halves of the gneiss dome. 16.5 STOP 4 Watklns Ranch (as shown on Happy Valley quad). Park at gate at end of graded county road, near ford across Palge Canyon. Walk south to tributary ,gully southeast of Palge Canyon, to outcrops of nearly massive, virtually unaltered biotite granodlorite, dated by the K-At method at m.y. by R.F. Marvln~ HoHo Mehnert, and Violet Merritt (1971, written commun.). A few hundred feet north of the tributary canyon, this granodlorlte intrudes the Continental Granodlorlte, here a coarsely porphyritic, strongly follated and lineated, dark-gray metagranodiorlte, It is the third major component of the gneiss complex° From some suitable vantage point we can see that much of the lowland to the west is underlain by basln-fill gravel. An older gravel unit is exposed along the north edge of the lowlands, extending almost to Paige Canyon. It is reddish gray and finer grained than the younger gravel. It contains mainly clasts derived from the allochthonous plates~ and it is correlated with the Pantano Formation of Ollgocene to Miocene age. The low rolling hills i-2 miles north of the ranch are underlain by granodiorlte of Rincon Valley, and the higher hills to the northwest are underlain mainly by rocks ranging from Cambrian (Bolsa Quartzite) to Permian (Concha Limestone) age; the hills also include some Cretaceous rocks (Bisbee Formation).
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