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Geologic Map of the Slate Creek Quadrangle, Idaho County, Idaho

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Geologic Map of the Slate Creek Quadrangle, Idaho County, Idaho IDAHO GEOLOGICAL SURVEY DIGITAL WEB MAP 110 MOSCOW-BOISE-POCATELLO WWW.IDAHOGEOLOGY.ORG SCHMIDT AND OTHERS CORRELATION OF MAP UNITS Pmt Metatonalite (Permian)—Light gray to medium gray rocks that occur as an zone and has mostly obscured that structure. South of Russell Bar, displace- intrusive package with variable composition and texture. Compositions ment is accommodated by a single fault that has reactivated an older range from hornblende-biotite tonalite with as much as 15 percent mafic mylonite zone. Thus, the two major Mesozoic contractional structural GEOLOGIC MAP OF THE SLATE CREEK QUADRANGLE, IDAHO COUNTY, IDAHO Artificial Sedimentary and Volcanic Rocks Island-Arc Island-Arc Sedimentary and Eastern Assembage minerals to leucocratic tonalite with less than 3 percent altered mafic zones, the Klopton Creek-Hammer Creek thrust and the older mylonite Deposits Mass Movement Deposits Intrusive Rocks Volcanic Rocks Rocks minerals. At many outcrops, the metatonalite is intimately intermixed with zone, have strongly controlled the geometry of Neogene extensional Alluvial Eolian Mass Movement greenstone (unit TRPgs described below), and mutually cross-cutting faulting. This conclusion is corroborated by studies to the south, along the relationships are apparent. Quartz composes 20 to 50 percent of the rock Salmon River suture zone near McCall, where Giorgis and others (2006) Disclaimer: This Digital Web Map is an informal report and may be Deposits Deposits Deposits and occurs as either light gray to bluish phenocrysts that are locally observed that Neogene normal faulting has reactivated Cretaceous ductile Keegan L. Schmidt, John D. Kauffman, David E. Stewart, Reed S. Lewis, Kurt L. Othberg, and Dean L. Garwood revised and formally published at a later time. Its content and format m Qam Qlsa may not conform to agency standards. Qas Qaf Qed Holocene resorbed and embayed or as a constituent of the groundmass. Altered structures. Qamo plagioclase as much as 6 mm long composes from 40 to 80 percent of the Qtg Qc 2 Qafo rock and also occurs in the groundmass. Biotite and locally hornblende are We were able to discern only some of the considerable structural 2009 Qtg3 Qls QUATERNARY present. Texture is generally medium grained and porphyritic, with locally complexity above the Deer Creek detachment because the primary control Qtg4 Pleistocene for determining displacement in the basalt is the easily recognizable Qtg Qms occurring coarse-grained and fine-grained leucocratic varieties. The rocks 5 Imnaha-Grande Ronde basalt contact; this contact is only exposed in some Qtg QTc are pervasively metamorphosed, with chlorite and epidote replacing most Qamo Tli 6 of the faulted blocks. Although the R -N Grande Ronde Basalt contact is JTR vs Qafo m mafic minerals and plagioclase largely replaced by sericite. The 1 1 Tli Tgr1 Pliocene exposed in many structural blocks in this small area, that contact is less Qam Tim metatonalite is locally foliated, and in places forms well-developed Tim Tgn1 07JK026 Tgr1 unconformity mylonites. Two zircon fractions from a sample of mylonitic tonalite, useful in determining displacement because field magnetometer readings 40 JTR vs Tgn1 are commonly inconclusive near the contact. The presence of thick Latah Qtg Columbia River Basalt Group collected less than one mile south of the mouth of Slate Creek, yielded a Qls 2 m Tli Tgn concordant U-Pb age of 258 Ma (Walker, 1986). Two zircon fractions from Formation sediments and restriction of Grangeville basalt to the Deer Creek 8 1 Saddle Mountains Tgv Basalt area indicate that a north-south-trending trough was developing above the Qtg3 Tim CENOZOIC a second sample described as trondhjemite from along the Salmon River Deer Creek detachment system at least by the time Grande Ronde Basalt Qaf Qam Tgn 1? Tcg just south of the map yielded a concordant 260 Ma age. These Permian dates indicate that the metatonalite forms part of the basement beneath the extrusion had ceased. The faults bounding the zone may also have begun to Qafo Tcrb Tgv Tgv d Seven Devils Group. form prior to deposition of the sediments, although the timing of movement JTR vs 10 Tgv Grande Ronde is poorly constrained, in part because most of the sediments are now Tim Miocene Tim Basalt TERTIARY Although not shown on the map, a small intrusive body of coarse-grained slumped and their original relation to the faults and the underlying Grande Qam Tim Qas 4 Qaf Tgr2 muscovite tonalite less than 0.3 miles across and surrounded by metato- Ronde Basalt is difficult to reconstruct. At several locations, the sediments 2 nalite was identified on the ridge southeast of Joe Creek at an elevation of and overlying Grangeville basalt are tilted and may be faulted, indicating 12 Tgn1 2,500 feet (latitude 45.65558 N., longitude 116.30393 W.). Contact postbasalt movement. Faulting likely continued into the Pliocene and Qamo 5 Tli Tgr relationships between this intrusive and the surrounding metatonalite are possibly the Pleistocene. Qafo Tgv 1 m Tgn obscured. The muscovite tonalite is strongly foliated and consists of 5 1 Imnaha Basalt Tgr1 Tim Qaf Qam approximately 35 percent quartz as large as 5 mm, 50 percent plagioclase Tgv 60 Qafo Tim Tgr 53 30 as large as 1.5 mm, and 10 percent distinctive euhedral muscovite that 1 Qamo SYMBOLS 70 Qtg forms books as large as 1 cm. Biotite is accessory. Although the age is JTR vs 3 Tgn unconformity Qam 1 Tgv poorly constrained, we interpret the muscovite tonalite as younger than the Tgr1 Qaf Tgn 1? metatonalite and assume it is Permian to Cretaceous because it is less 30 Qtg4 CRETACEOUS Contact: dashed where approximate. 6 2 metamorphosed than the metatonalite. Tgr QTc 1 Qam 08JK153 Qtg2 Fault: bar and ball on downthrown side; dashed where inferred; dotted Tgn JURASSIC TRPgs Fine-grained greenstone (Triassic to Permian)—Mapped where greenstone Tim 1 Qlsa KPdl MESOZOIC where concealed. QTc Qtg4 INTRODUCTION KPdm KPdg JTRsv JTRvs KPt JTRl KPgc Qls Tli 44 Qc dominates over intermixed metatonalite (unit Pmt) with mutually cross-s- Qamo Tgn1 QTc Qtg5 cutting relationships. Consists of light to dark gray-green, generally Thrust fault: teeth on upper plate; dashed where inferred; dotted where Tim Tim JTR sv TRIASSIC 07KS017B Tcg fine-grained rocks of mafic protolith, which locally display medium-m- concealed. QTc Qls QTc TRPms 25 Tgr Tgv Tgv Qtg4 The geologic map of the Slate Creek quadrangle shows rock units exposed KPdg 1 Tli TRPgs grained and relict porphyritic textures. Pervasively metamorphosed to 40 45 59 Qas at the surface or underlying thin surficial cover of soil and colluvium. Reactivated thrust fault: teeth on upper plate; bar and ball on downthrown Qaf Qafo 24 06JK250 Qtg6 greenschist grade, with the groundmass and many crystals altered to Qafo Qaf Qamo Thicker surficial alluvial, colluvial, and landslide deposits are also shown Pmt Tgn PERMIAN PALEOZOIC chlorite, sericite, and epidote. Most of this unit appears to have been side on reactivated fault segments; dashed where inferred; dotted Qafo Qaf 1 Qam Qas where they mask or modify the underlying rock units or form significant B Qls intrusive; however, some relict volcanosedimentary features, such as where concealed. Tli Qtg3 Qls mappable units. The map is the result of our field work in 2007 and 2008, Qafo QTc Qaf Tgn1 Tgn1 breccias and conglomerates, are locally present and represent wallrock Qlsa Qtg2 KPdg? Qtg2 as well as compilation of previous research, including that of Bond (1963), Fold axis; arrow indicates direction of plunge. m screens and pendants to the Cougar Creek intrusive complex. In outcrops Qls Qas Coffin (1967), Lund and others (1993), and reconnaissance mapping from Qafo Qls Qamo above Blackhawk Bar south of Slate Creek, lithologies include strongly Qls 15 Qas 1978 to 1980 by V.E. Camp (Camp, 1981; Swanson and others, 1981). Anticline. Tgr1 Imnaha Basalt recrystallized metavolcanic and metasedimentary rocks containing relict Tim KPdg Tgn 4 1 vesicles in mafic to intermediate lava flow rocks, relict embayed quartz Syncline. Qls The oldest rocks in the quadrangle are metamorphosed Permian to Jurassic QTc Tgn1 Tim Imnaha Basalt (Miocene)—Fine- to coarse-grained, sparsely to abundantly phenocrysts in felsic to intermediate volcanic rocks, and relict rounded volcanic, volcaniclastic, sedimentary, and associated intrusive rocks of the 14 Qamo VC79-525 plagioclase-phyric basalt; olivine common; plagioclase phenocrysts gener- Strike and dip of bedding or volcanic flows. Tgr accreted Wallowa terrane. These folded and faulted basement rocks are quartz clasts with quartz overgrowths preserved in clastic sedimentary 1 KLOPTON Tgr2 ' ally 0.5-2 cm long, but some are as large as 3 cm. Normal magnetic polar- Tgr A rocks. Portions of this unit could be equivalent to the Permian Hunsaker 10 CREEK 1 capped by Columbia River Basalt Group lava flows, which are also faulted Estimated strike and dip of bedding or volcanic flows. 08JK147 Qam Qas ity. Weathers to sooty brown granular detritus. Commonly has well-l- Creek Formation of Vallier (1977), which is composed primarily of mafic THRUST 54 Tgr1 Qls and tilted in a zone several miles wide paralleling the Salmon River. Qtg4 Qas Tli developed fanning or irregular columns 1-2 feet in diameter. Maximum Tgn Structural offset in the basalt is more than 2000 feet between the Salmon volcanic sands and silts. It is also possible that at least some of the porphy- Strike of vertical bedding or volcanic flows. 1 Tgn exposed thickness is about 1,200 feet; the number of flows was not deter- Tgn 1 ritic metatonalite associated with the greenstone could be a deeper-level 56 Qas 10 1 River and the west edge of the map. Latah Formation sediments associated 81 Tim Tgr Tgn mined. A dike about 6 feet wide crosscuts Imnaha flows on the southwest 87 83 1 1 with the basalt probably were deposited in a developing trough west of and equivalent to the quartz keratophyre rocks Vallier (1977) describes from the Strike and dip of foliation.
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