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Geologic Quadrangle Map QM-10, Geologic Reconnaissance of the Central Portion on the Wallowa Mountains, Oregon

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Geologic Quadrangle Map QM-10, Geologic Reconnaissance of the Central Portion on the Wallowa Mountains, Oregon QM-10 PLATE 1 Key to M;...,..liutloft : STAT£ Of OREGON Conruto Dl GToM!old R.ocko1 DEI'All'Oj[!'ff OF GEOLOGY AND lollNERAI,. IMOUSTIIlllS E.IMI,.. Minooo ond PToopocb> Mincn.li.o.od Zona> Proop«ti... AnNI ... GEOLOGIC RECONNAISSANCE o/ rht CENTRAL PORTION o/ rM WALLOW A MOUNTAINS OREGON 1938 LEGEND Q•l AllUVIUM AND GLACIAL METAMORPHIC LIM(S10N£ "NO Sf.DIMENT'S MARBU Mo"l' fiu ra•....l ...d•• 14'h"•· ~·"~• bluri, und m<nU; ..... r... "'''Ui"'' '""'"'''"'' ""'"'· ..........,. 1•-f•n< rruo....,.IJ,.,...., 0 .......... '""' .11.11<.1, """'' l<n•<o G/ ""''"""'· In '" ......... •'"""'"' "'"'1.1' rW< .. ,.,..;r,,....... In J>l•><<•fo.,ilof.,.••• BASALT /lu>uh ~o<o'J, ~"«I<>J>O< onl<>l>«io-• .. mil~r lo CoiM"'bio< R!<Yr & ...It cg , -' GR£ENSTONE o......,, "'"'"..h r.. ., ... ~•xM 1 "''""""'p~.,,.,J .nJ f«q"""'l' DIMES '"ntwnlnJ ~"R' ph<n<n'f~IU. >-mo<tom" !<'"""~"' Undofl"""'""d """''l<ir dih> ,.,,J J,,.l.,·o/ot<d Oump•n.• t•h>f<<!J .w.... FAULTS .-.NnCUNES % sYNCLINES % GRAN i tOID ROCKS CONTA(15 /' U..>holl<h.c ''"'"'-' "/ '"..,J;~,. ~·~ln.,!, liJhl·~ulor<d ''""""'"' '""~'' nooorlv ~r~n<>db.,irr, h~r "'irh n~m<ro"' .,.,.;.,,;....., in DIP AI'ID STRIKE _.~... ... <<>lo• rond "'"''~'"""" --JEll-- SCALE G...,k.Jy bv o. Smoth; by 8,,., l..'nuN Stot .. Fomr S.tnC< w.,..,. ·""''"«< Ro\ C. Tr<oohoo John Elm< Allcn fotto< "'lao, \Vol!,,.,..•• nJ \hn.o11o f~l'" Sh«n. u .... J Rull W .,.,., Lo~·•ll S~t•<\"al 191!·1917 It is possible t hat economic minerals may be found in recovered at a sr.telter but it is doubtful i f &old or the dikes and alo of the Central Portion of the ng such contacts although none were silver will be n ined, as such. Greenst ones underli e t he metamorphic sediments and found by t his s urvey . ma rbles and are the oldest rocks ma?ped. Northeast of Point Joseph a sedimentary interbed at least 400 feet thick and several hundred feet. below the top of the greenstone sequence, contains fossils that suggest a Copper sulfides, silicates, and carbonates are The basalts are usually dense, dark grey to blaok, found associated Triassic age determination. The northern series around with dikes within the ~ranodiorite r~ rl aphanitic lava•. Vesicular, scoriaceous, and porphyri­ at or INTRODUCTION Wallo.va Lake must be at least 3000 feet thiok as measur­ near limestone contacts. l;'any prospects haye beer, tic textures are not uncommon, The individual flows are opened at such occurrences, attention being attracted t o ed in two separate places. No section could be measured usually about 20 feet thick, and columnar jointing is in the southern area on main Eagle Creek. them by copper stains. Results have not been encourag­ well developed although platy and blocky phases were ing, but the widespread occurrence of the copper nino r­ observed. A highly magnetic, dense, black basalt was als indicate that at some A geologic reconnaissance of the central portion of The greenstone of the northern area is a very hard, point, a sizeable deposit noted on Lookout Mountain, and elsewhere. might be found, capable of the Wallowa Mountains was carried out by the State De­ dense, tough, dark-green rock, A porphyritic phase con­ being worked when the price partment of Geology and Mineral Industries in order of copper rises, and favorable transportation is devel­ to tains lath-shaped feldspars that attain a length of five These basalt flows cap the ridges determine the areas or zones most suitable for prospect­ along the north­ oped in the area. centimeters and occur in rosette-like groups in a dark, ern edge of the Wallowa Range. They underlie the Vlallowa­ ing; to definitely oe~tain eliminate localities as being fine-grained matrix. The phenocrysts are thought to be Grande Ronde valley unfavorable prospecting at an elevation of about 4500 ,·oat Lead and Zinc ground; to prepare a reconnais­ secondary and the greenstones to be of extrusive rather and have sance geologic map illustrating a very flat dip. They next appear high o - the the conclusions; and to than intrusive origin. §( Another common phase of the crest of the ridges to t he south carry northward the data published at elevations of about Lead and zinc minerals were not noted in the course by this Department as rock is a breccia of greenstone fragments imbedded in a 6000 feet and r i se to 8500 feet before Bulletin no. 3, "The Geology of a they disappear. of this survey although unconfirmed reports of lead and Part of the Wallowa matrix of green, fine-grained tuff or lava. Farther south and toward the vrest and Lountains, Oregon", by Clyde Ross. east, the lava is zinc from the B. C. Basin, east of Hurricane Creek, we!"e several thousand feet thick and overlies all other form­ received, Some further prospecting might The greenstone of the southern area appears mega­ be done in the ations at the lower elevations. On the south side of B. C. Basin to determine the value of these deposits; Extent o.f the Survey scopioally to be a dark-green, granular, gabbroi d rook, the range, only Bennetts Peak is capped with basalt otherwise it is su~ g ested that a search for lead and c~posod mainly of pyroxene. It may represent a contact (elev. 6000 ft.) but a few miles west and south, Five geologists and four student assistants basalt zinc minerals be directed to more favorable localities. spent metamorphic phase of the sediments correlative with the becomes the predominant rook type. five weeks in July and August, 1938, plus an additional Hummingbird Peak metamorphics. South of Bennetts Peak a ·.•eek by two .geologists and two student assistants. t!olybdenum Geo­ large area of grey to greenish-altered rocks, apparently The basalt is assumed to correlate with Columbia logic contacts and belts of mineralization were studi ed of volcanic origin, was included with the metamorphic River Basalt and i s therefore of middle Miocene age. Molybdenite, the molybdenum sulfide, and molybdi t in some detail. Rooks and formations were classified by sediments. e , field methods. The map and data must be regarded as the molybdenum oxide, oocur at many looalities . Tlo<Jy are found in the t~otite which is a metamorphic assemb­ strictly preliminary, and conclusions may be modified by Ross §( considers the greenstone to be Permian in further work. la~e of minerals formed at the contact of t he granodio­ the area to the southeast. Fossils from an interbed on Alluvium, or unconsolidated deposits, within the rite with limestone. This taotite is usually composed Point Joseph may be Triassic. Therefore, the greenstone central Wallowa Uountains is glacial or derived directly of grossularite garnet in large crystals, with lesser Personnel is provisionally considered to be Triassic, or older. from glacial deposits. The boulders are predominately amounts of epidote, quartz, calcite, wollastonite, ~ n d . granitoid, wi t h minor amounts of greenstones and marbles. The survey parties were directed by Earl K. Nixon, sometimes minor amounts of pyrite and copper minerals. Metamorphic Sediments Size vari es from r ock flour to boulders 10 f eet in dia­ Direct or of the State Department of Geology and Mineral Molybdenite is less frequently finely disseminated wi ,. meter. in the taotite zone and may be associated with minute Industries, who kept in close touch with the progress of The metamorphic sediments throughout the region map­ t he work by correspondence and field amounts of scheelite. Molybdenite and copper minerals inspection. Warren ped, conformably overlie the greenstones. Several hori­ The great lateral and terminal mora i ne that impounds D. Smith was geologist seem to have some assooiation, as flakes of molybdenit e in charge of field parties, zons of marble and limestone are interbedded with these Wallovra Lake is undoubtedly one of the best preserved of assisted by Ray C. Treasher were noted at most of the oopper prospects. and John Eliot Allen of the sediments. They tend to be highly calcareous near the its kind in the United States. The lateral moraine is State Department of Geology and Mineral Industries, and marble contacts, and contain Triassic fauna. The argil­ 800 f eet high at the upper end and its smoothly sloping The general ooourrenoe o~ molybden Lloyd Ruff and Wayne Lowell, geologists. Fred Hoffstaed, i te in the tact­ litic portions of the group range from dark, fossilifer­ si des strongly suggest an artificial embankment. The ita should encourage further prospecting \Yilbur Greenup, James Weber, and Herbert Harper for thi s miner­ were ous shale to dense, hard argillites or hornfels that are moraines at the mouths of Lostine River and Hurricane al. The contact zones and areas of student assistants, with Forrest Landeen as cook. mineralization shovm Almost "basaltic" in appearance, and "clink" like a Creek are di stinct physiographic features. They are on the small map may be considered as a guide to such phonolite. Fine- g rai~ed disseminated pyrite appears in well developed on the east side of Eagle Creek, and a localities, Acknowledgements While the law price of copper does not per­ many of these. Bending is apparent even in the more al­ small terminal moraine with two lobes impounds Two Col or mit the economic development of many of these prospects tered types but slaty cleavage is seldom developed. Luke, just south of Hummingbird Mountain. The tops of for copper, the higher The topographic base was supplied from the Forest priced molybdenite may stimula te the lateral moraine ridges on Eagle Creek are 1000 feet the mining of a deposit from which copper could Atlas of the United States Forest Service; sheets 8, 9, be recov­ Where these sediments have been intruded by the above the valley floor.
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