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Oregon Geology and Mineral Industries (Volumes I Through 40 Were En­ Titled the Ore Bin) OREGOM GEOLOGY published by the Oregon Department of Geology and Mineral Industries VOLUME 43 , NUMBER 2 FEBRUARY 1981 OREGON CEOLOGY DOGAMI releases new publications (ISSN 0164-3304) on Breitenbush Hot Springs and VOLUME 43, NUMBER 2 FEBRUARY 1981 rotation of the Western Cascades Published monlhly by the State of Oregon Department of of Oregon Geology and Mineral Industries (Volumes I through 40 were en­ titled The Ore Bin). The Oregon Department of Geology and Mineral Indus­ tries (DOGAMI) announces the release of two new publica­ tions: Special Paper 9, Oeology 0/ the Breitenbush Hot Governing BNrd John L. Schwabe, Chairman . .. .. .. .. .. Portland Springs Quadrangle, Oregon, by Craig White of Boise State C. Stanley Rasmussen .. .. .. ... .. .. ... ..... ... Baker University, and Special Paper 10, Tectonic Rotation 0/ the Allen P. Stinchfield . .. ... .......... ... .. North Bend Oregon Western Cascades, by James Magill and Allan Cox of Stanford University. Stale Geologist .• . .••..•• . ... .. .. ... .. .. Donald A. Hull The Breitenbush Hot Springs area, the subject of Special Paper 9, is a region of recognized high geothenpal potential Deputy Stal. Geologist . .. .. ... .. .. .. .•..•• John D. Beaulieu that is currently undergoing cooperative investigation by DOGAMI, private utilities, and industry. The geologic map Editor . ... ... .... .. ...... .. ... Beverly F. Vogl and 26-page explanatory text of Special Paper 9 will assist in Main OffiCI: lOOS Statt Office Building. Portland 97201, phone the overall assessment of the resource. (503) 229-5580. The 67-page Special Paper 10 summarizes current paleo­ magnetic research in the Western Cascades. Geologist's believe Biker field Otlie.: 2033 First Street, Baker 97814, phone (S03) that large blocks of the earth's crust have moved in relation to 523-3133. each other. The boundaries between these blocks-or plates­ Howard C. Brooks, Resident Geologist may be regions of significant mineralization and high geo­ thermal potential. The authors of Special Paper 10 postulate Grants Pus field OHicl: 312 S.E. ~HH Street. Grants Pass 97526, that western Oregon and Washington from the Klamath phone (503) 476-2496. Len Ramp, Resident Geologist Mountains nonhward have been affected by plate tectonic mo­ tion during the last SO million years. The movement occurred Mined land ".clamalion Program: 1129 S.E. Santiam Road, in two stages, with net clockwise rotation in both stages. Albany 97321, phone (503)967-2039. Owing to the opening of the Basin and Range, movement in Paul F. Lawson, Supervisor the last 20 million years has produced a net eastward displace­ ment of the Coast Range and Western Cascades block. The Subscription rates: I year, S4.00; 3 years, SIn.OO. Single issues, eastern boundary of this block may lie beneath the High $.40 at counter, $.50 mailed. Cascades, a region of intense volcanism. Available back issues of The Ore Bin: $.25 at counter, $.50 The price of Special Paper 9 is $4.00, that of Special mailed. Paper IO is 53.00. Address orders to the Oregon Department Address subscription orders. renewals, and changes of address of Geology and Mineral Industries, 1005 State Office Building, to Oregon Geology, 1005 State Office Building, Pordand, OR Portland, Oregon 97201. Payment must accompany orders of 97201. less than 520.00. 0 Send news, notices, meeting announcements, articles for publi­ cation. and editorial corres pondence to the editor, Portland of· fice. The Department encou rages author-initiated peer review for technical articles prior to submission. Any review should be noted in the acknowledgments. Permission is granted to reprint information contained herein. -- --- - --- -- -- - - Credit given to the Oregon Department of Geology and Mineral Industries for compiling this information will be appreciated. CONTENTS Second class poStage paid at Portland, Oregon. A major Cretaceous discontinuity in north-central Postmaster: Send address changes to Oregon Geology, 1005 State Office Building, Pordand. OR 97201. Oregon................................... 15 Geology and mineral deposits of the Quartzville mining district. Linn County. Oregon ......... 18 New USGS open-file reports released. 19 Oregon's southernmost glacier named for COVER PHOTO hypothermia expert. .. 20 Oblique aerial photograph. looking to the nonhwest.of the Oil and gas exploration spreads to other parts of area around Mitchell, nonh-<:entral Oregon. Cretaceous rocks state. 21 found bere and further to the south and east are discussed in Correction. 21 the article beginning on the next page. (Copyrighted photo­ grapb courtesy Delano Photographics, Inc.) Ewart M. Baldwin retires. 22 14 OREGON GEOLOGY, VOL. 43, NO.1, FEBRUARY 1911 A major Cretaceous discontinuity in north-central Oregon by Greg Wheeler, Geology Department, California State University, Sacramento, California 95819 ABSTRACT 3). The Gable Creek Formation is described by Oles and Enlows (1971, p. 11) as containing clasts that are "rounded to The Cretaceous rocks of north-central Oregon are textur­ subrounded, ranging in size from small pebbles to boulders," ally and compositionally diverse. The Cretaceous rocks found most commonly including "chert, quartzite, and granitic farther to the east are less mature and do not contain the rocks," and minor amounts of "vein quartz, phyllite, granite and greenstone clasts found in Cretaceous conglomer­ greenstone, mafic volcanics, and sandstone." The cementing ates near Mitchell, Oregon. The Cretaceous rocks are divided agent is calcite. by a major unconformity between the Upper Cretaceous Cretaceous beds at Antone, Dayville, and north of Suplee (Turonian) rocks exposed in the eastern outcrop area and the in the Dayville quadrangle; north of Deer Creek in the Izee Lower Cretaceous rocks at Mitchell. quadrangle; and along Dixie and Windlass Creeks in the Bates quadrangle are lithologically distinct from those further west DESCRIPTION OF ROCKS at Mitchell. The most abundant rock type is sharpstone con­ glomerate with clasts 1 to 4 cm in size and a fine-grained Numerous outcrops of Cretaceous rocks in north-central groundmass. Medium- to fine-grained sandstone makes up 30 Oregon have been described by Packard, 1928; Popenoe and percent of the unit and shale and breccia less than 5 percent others, 1960; Wilkinson and Oles, 1%8; Oles and Enlows, each. A typical hand specimen of sharpstone conglomerate 1971; Dickinson and others, 1976; Wheeler, 1976; Mullen, contains 50 percent chert. The abundance of chert produces a 1978. Exposures of these rocks generally encompass only 2 to rough, knobby surface, with clasts 2 to 4 cm in diameter pro­ 10 km2; however, Cretaceous rocks covering 125 km2 crop out truding from a surface of less resistant groundmass and shale in the Mitchell quadrangle near Mitchell, Oregon (Figure 1). clasts. Red chert is the most angular type but is less common The Cretaceous rocks in the Mitchell quadrangle are ex­ than grey, brown, and buff chert clasts, which are more posed in the core of the Mitchell anticline. The rocks are rounded and usually larger. divided into two main map units on the basis of lithology. The Quartz, mostly as clear, rounded individual grains, makes shale lithology is named the Hudspeth Formation (Figure 2), up 25 percent of the rock. Some quartz grains are 0.5 mm in and the intertonguing conglomerate unit is named the Gable diameter, but most are somewhat smaller. The clarity and size Creek Formation (Wilkinson and Oles, 1968, p. 133) (Figure of these quartz grains indicate a coarse-grained plutonic or Figure 1. Index map oj north-central Oregon showing location oj Cretaceous outcrops. Lined pattern represents Lower Cretaceous (Albian-Cenomanian) rock outcrops. Arrows point to solid black areas that represent Upper Cretaceous (Turonian) rock outcrops. WHEELER I I I -------,Antone; .;I I .. I _.J.----- .,~ John Day River I I I GRANT I I ¢.; I .... ~. I -- .", .... Seneca , 10 miles OREGON GEOLOGY, VOL. 43, NO.2, FEBRUARY 1981 15 Figure 2. Fault offset in bedded shale and sandstone of Hudspeth Formation jusr east of Ochoco Summit on U.S. Highway 26. vein source. A few quartz crystals have resorbed margins and deep regolith. Freshly broken surfa«s are yellow-brown. remnant bipyramidal shape indicative of volcanic quartz. In contrast to the Cretaceous rocks of the Mitchell area, Quartzite clasts present in some thin s«tions indicate that a rocks in the areas farther to the east contain no granitic and sedimentary sour« also donated quartz to the depositional only a few greenstone clasts. Much less chert is found in the basin. The remaining 20 to 25 per«nt of the sharpstone con­ Gable Creek Formation than in conglomerates to the east. The glomerate is made up of fine-grained sand and siltstone clasts. presen« of shale clasts, angularity of all clasts, and poor sort­ The siltstone clasts, which have indistinct boundaries with the ing indicate that the Cretaceous rocks in the Dayville, izee, sandy matrix, appear to be "rip-up" clasts from the finer­ and Bates quadrangles are texturally less mature than the grained beds. Greenstone clasts are present but are quite rare western rocks. The compositional and textural differences of in mOSt outcrops. the eastern Cretaceous rocks may be partly due to their prox­ The finer grains have essentially the same composition as imity to pre-Tertiary rocks in the Blue Mountain uplift that the coarser material, except that the quartz content increases may be the common sour« of north-central Oregon relative to chert as grain size decreases.
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