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,{"id":14073,"text":"ofr68126 - 1968 - Application of ultraviolet reflectance and stimulated luminescence to the remote detection of natural materials","interactions":[],"lastModifiedDate":"2025-06-17T16:07:26.409085","indexId":"ofr68126","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1968","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"68-126","title":"Application of ultraviolet reflectance and stimulated luminescence to the remote detection of natural materials","docAbstract":"<p>Carbonate rocks and evaporite deposits commonly exhibit relatively high reflectance in the ultraviolet (&lt;3600A), and some outcrops of these materials are selectively shown on ultraviolet imagery. Other materials which are commonly strongly imaged on ultraviolet imagery and photography include water, snow, concrete, and metallic objects, particularly aluminum.</p><p>Outdoor tests of an active ultraviolet imaging system have demonstrated the feasibility of imaging ultraviolet stimulated luminescence of such minerals as talc, dolomite, and deweylite along quarry faces from distances of several hundred feet. The system features a cathode ray tube transmitter, an image dissector receiver, and a video monitor on which the distribution of luminescent material is imaged as the outcrop is scanned.</p><p>A pulsed ultraviolet laser emitting at 3371A has been used successfully in the laboratory to stimulate phosphorescence of selected rock and mineral specimens and to discriminate between them on the basis of decay time which ranges from less than three to more than 10 microseconds. Initial results suggest that sodic feldspars have longer decay periods than calcic feldspars. Some granites also appear to have decay periods significantly different from other types of granite in the same locality.</p><p>Outdoor tests with a high-resolution grating spectrometer were successful in detecting luminescent materials by means of the so-called \"Fraunhofer line-depth method\". This method is advantageous because it uses the sun so an ultraviolet source and therefore ifs independent of low-powered artificial sources such as cathode ray tubes, lasers, and mercury vapor lamps„ A Fraunhofer line- discriminator suitable for aircraft operation has been constructed, and initial on-the- ground tests are being performed on Rhodamine WT, a luminescent dye used by hydrologists and oceanographers in studies of current dynamics in streams and estuaries.</p>","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/ofr68126","usgsCitation":"Hemphill, W.R., 1968, Application of ultraviolet reflectance and stimulated luminescence to the remote detection of natural materials: U.S. Geological Survey Open-File Report 68-126, 36 p., https://doi.org/10.3133/ofr68126.","productDescription":"36 p.","costCenters":[{"id":222,"text":"Earth Resources Observation and Science (EROS) Center","active":true,"usgs":true}],"links":[{"id":490857,"rank":3,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1968/0126/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":397882,"rank":2,"type":{"id":15,"text":"Index Page"},"url":"https://ntrs.nasa.gov/api/citations/19690018949/downloads/19690018949.pdf","size":"6,304 KB","linkFileType":{"id":1,"text":"pdf"}},{"id":146665,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1968/0126/report-thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ac6e4b07f02db67a5af","contributors":{"authors":[{"text":"Hemphill, William R.","contributorId":21970,"corporation":false,"usgs":true,"family":"Hemphill","given":"William","email":"","middleInitial":"R.","affiliations":[{"id":595,"text":"U.S. Geological Survey","active":false,"usgs":true}],"preferred":false,"id":168885,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":3921,"text":"cir560 - 1968 - U.S. Geological Survey heavy metals program progress report, 1966 and 1967","interactions":[],"lastModifiedDate":"2012-02-02T00:05:26","indexId":"cir560","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1968","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":307,"text":"Circular","code":"CIR","onlineIssn":"2330-5703","printIssn":"1067-084X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"560","title":"U.S. Geological Survey heavy metals program progress report, 1966 and 1967","language":"ENGLISH","publisher":"The Survey,","doi":"10.3133/cir560","usgsCitation":"Water Resources Division, U.S. Geological Survey, 1968, U.S. Geological Survey heavy metals program progress report, 1966 and 1967: U.S. Geological Survey Circular 560, iii, 24 p. ;27 cm., https://doi.org/10.3133/cir560.","productDescription":"iii, 24 p. ;27 cm.","costCenters":[],"links":[{"id":117187,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/circ/1968/0560/report-thumb.jpg"},{"id":31007,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/circ/1968/0560/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a2ae4b07f02db612554","contributors":{"authors":[{"text":"Water Resources Division, U.S. Geological Survey","contributorId":128075,"corporation":true,"usgs":false,"organization":"Water Resources Division, U.S. Geological Survey","id":528166,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":3973,"text":"cir460C - 1968 - The Vigil Network: Preservation and access of data","interactions":[],"lastModifiedDate":"2012-02-02T00:05:28","indexId":"cir460C","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1968","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":307,"text":"Circular","code":"CIR","onlineIssn":"2330-5703","printIssn":"1067-084X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"460","chapter":"C","title":"The Vigil Network: Preservation and access of data","language":"ENGLISH","publisher":"U.S. Geological Survey,","doi":"10.3133/cir460C","usgsCitation":"Emmett, W.W., and Hadley, R.F., 1968, The Vigil Network: Preservation and access of data: U.S. Geological Survey Circular 460, iii, 21 p. :maps ;26 cm., https://doi.org/10.3133/cir460C.","productDescription":"iii, 21 p. :maps ;26 cm.","costCenters":[],"links":[{"id":120761,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/circ/1968/0460c/report-thumb.jpg"},{"id":31058,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/circ/1968/0460c/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ab0e4b07f02db66d5c6","contributors":{"authors":[{"text":"Emmett, William W.","contributorId":68715,"corporation":false,"usgs":true,"family":"Emmett","given":"William","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":147932,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hadley, R. F.","contributorId":27028,"corporation":false,"usgs":true,"family":"Hadley","given":"R.","middleInitial":"F.","affiliations":[],"preferred":false,"id":147931,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":68473,"text":"ha284 - 1968 - Ground-water resources of the eastern shore of Virginia and the James, York, and Rappahannock river basins of Virginia east of the fall line","interactions":[],"lastModifiedDate":"2012-02-02T00:13:37","indexId":"ha284","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1968","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":318,"text":"Hydrologic Atlas","code":"HA","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"284","title":"Ground-water resources of the eastern shore of Virginia and the James, York, and Rappahannock river basins of Virginia east of the fall line","language":"ENGLISH","doi":"10.3133/ha284","usgsCitation":"DeBuchananne, G.D., 1968, Ground-water resources of the eastern shore of Virginia and the James, York, and Rappahannock river basins of Virginia east of the fall line: U.S. Geological Survey Hydrologic Atlas 284, 2 maps on sheet 112 x 61 cm. fold. in envelope 30 cm., https://doi.org/10.3133/ha284.","productDescription":"2 maps on sheet 112 x 61 cm. fold. in envelope 30 cm.","costCenters":[],"links":[{"id":187934,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"},{"id":90018,"rank":400,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/ha/284/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":90019,"rank":401,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/ha/284/plate-2.pdf","linkFileType":{"id":1,"text":"pdf"}}],"scale":"5000000","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a96e4b07f02db65a661","contributors":{"authors":[{"text":"DeBuchananne, George D.","contributorId":10040,"corporation":false,"usgs":true,"family":"DeBuchananne","given":"George","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":278293,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":3822,"text":"cir597 - 1968 - Distribution of beryllium, tin, and tungsten in the Lake George area, Colorado","interactions":[],"lastModifiedDate":"2013-07-24T15:22:25","indexId":"cir597","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1968","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":307,"text":"Circular","code":"CIR","onlineIssn":"2330-5703","printIssn":"1067-084X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"597","title":"Distribution of beryllium, tin, and tungsten in the Lake George area, Colorado","docAbstract":"Complex ore deposits are spatially associated with granitic bodies of Precambrian age in the Lake George area, Colorado. They include greisens that contain high\nconcentrations of beryllium and subordinate amounts of tin, tungsten, and other metals associated with the Redskin Granite. Scheelite deposits in calc-silicate\nrocks and greisen deposits near Tappan Mountain that contain tin and tungsten minerals are associated with the Silver Plume (?) Granite. Samples of stream sediments and soils locally show anomalous concentrations of beryllium, tin, copper, lead, and molybdenum. Some of the areas of anomalous concentrations correlate with known deposits; others do not, and this fact suggests that further prospecting is warranted.","language":"ENGLISH","publisher":"U.S. Geological Survey","doi":"10.3133/cir597","usgsCitation":"Hawley, C.C., and Griffitts, W.R., 1968, Distribution of beryllium, tin, and tungsten in the Lake George area, Colorado: U.S. Geological Survey Circular 597, iii, 18 p., https://doi.org/10.3133/cir597.","productDescription":"iii, 18 p.","numberOfPages":"22","costCenters":[],"links":[{"id":139670,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/circ/0597/report-thumb.jpg"},{"id":271076,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/circ/0597/report.pdf"}],"country":"United States","state":"Colorado","county":"Park County","otherGeospatial":"Lake George","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -106.2102,38.6931 ], [ -106.2102,39.5682 ], [ -105.3282,39.5682 ], [ -105.3282,38.6931 ], [ -106.2102,38.6931 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a7fe4b07f02db648700","contributors":{"authors":[{"text":"Hawley, C. C.","contributorId":102070,"corporation":false,"usgs":true,"family":"Hawley","given":"C.","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":147674,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Griffitts, Wallace R.","contributorId":103260,"corporation":false,"usgs":true,"family":"Griffitts","given":"Wallace","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":147675,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":61643,"text":"gq733 - 1968 - Geologic map of the Leadore quadrangle, Lemhi County, Idaho","interactions":[],"lastModifiedDate":"2021-11-24T22:30:21.324733","indexId":"gq733","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1968","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":316,"text":"Geologic Quadrangle","code":"GQ","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"733","title":"Geologic map of the Leadore quadrangle, Lemhi County, Idaho","docAbstract":"<p>No abstract available.</p>","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/gq733","usgsCitation":"Ruppel, E.T., 1968, Geologic map of the Leadore quadrangle, Lemhi County, Idaho: U.S. Geological Survey Geologic Quadrangle 733, Report: 6 p.; Plate, https://doi.org/10.3133/gq733.","productDescription":"Report: 6 p.; Plate","costCenters":[],"links":[{"id":252523,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/gq/0733/report-thumb.jpg"},{"id":247946,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/gq/0733/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":103454,"rank":700,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_2040.htm","linkFileType":{"id":5,"text":"html"},"description":"2040"}],"scale":"62500","country":"United States","state":"Idaho","county":"Lemhi County","otherGeospatial":"Leadore quadrangle","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -113.5,\n              44.5\n            ],\n            [\n              -113.25,\n              44.5\n            ],\n            [\n              -113.25,\n              44.75\n            ],\n            [\n              -113.5,\n              44.75\n            ],\n            [\n              -113.5,\n              44.5\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a52e4b07f02db62a484","contributors":{"authors":[{"text":"Ruppel, Edward Thompson","contributorId":67066,"corporation":false,"usgs":true,"family":"Ruppel","given":"Edward","email":"","middleInitial":"Thompson","affiliations":[],"preferred":false,"id":266182,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":3981,"text":"cir558 - 1968 - Generalized hydrology of prairie potholes on the Coteau du Missouri, North Dakota","interactions":[],"lastModifiedDate":"2018-02-16T16:18:03","indexId":"cir558","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1968","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":307,"text":"Circular","code":"CIR","onlineIssn":"2330-5703","printIssn":"1067-084X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"558","title":"Generalized hydrology of prairie potholes on the Coteau du Missouri, North Dakota","docAbstract":"This report presents all the information, obtained during the investigation, that lends itself to generalization. It describes conditions on that part of the Coteau du Missouri where there is little integration of drainage systems. The surface of the glacial drift in this region is dotted with shallow depressions known as prairie potholes that hold water for varying lengths of time. Precipitation directly on a pothole is the basic source of its water supply, but it is only about half the potential evaporation; therefore, potholes tend to go dry. Basin inflow from melting snow or rain occurs only when the soil is frozen or saturated, a condition so erratic in occurrence that seasonal or annual precipitation is of little value as an indication of basin inflow. Net seepage outflow occurs from potholes on the higher parts of the Coteau at very low rates, but it can amount to 20 to 30 percent of the total water loss from a pothole. Net seepage inflow occurs at the potholes on the lower parts of the Coteau. \r\n\r\nThe phreatic surface (water table) tends to be a subdued image of the topography and is generally very near the land surface. The water surfaces of the potholes are part of the phreatic surface, and therefore they can be used to prepare a contour map of the phreatic surface; wells usually act as piezometers and thus are useless for such a purpose. \r\n\r\nGenerally, potholes with water relatively low in dissolved solids have net seepage outflow, and those with water containing high concentration of dissolved solids have net seepage inflow. The direction of ground-water movement can therefore be inferred from the quality of water in potholes. The total salinity of water in a pothole is largely a function of the rate of ground-water flow and the relationship of seepage inflow to outflow. \r\n\r\nThe species of emergent aquatic vegetation that grow in a pothole are directly related to the permanence and salinity of the water at the particular site of each species. The report contains a table of the common species that can be used as indicators of these conditions.","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/cir558","usgsCitation":"Eisenlohr, W.S., and Sloan, C.E., 1968, Generalized hydrology of prairie potholes on the Coteau du Missouri, North Dakota: U.S. Geological Survey Circular 558, v, 12 p., https://doi.org/10.3133/cir558.","productDescription":"v, 12 p.","costCenters":[{"id":478,"text":"North Dakota Water Science Center","active":true,"usgs":true},{"id":34685,"text":"Dakota Water Science Center","active":true,"usgs":true}],"links":[{"id":31066,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/circ/1968/0558/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":124470,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/circ/1968/0558/report-thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b25e4b07f02db6aed63","contributors":{"authors":[{"text":"Eisenlohr, William Stewart","contributorId":36533,"corporation":false,"usgs":true,"family":"Eisenlohr","given":"William","email":"","middleInitial":"Stewart","affiliations":[],"preferred":false,"id":147945,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Sloan, Charles E.","contributorId":74364,"corporation":false,"usgs":true,"family":"Sloan","given":"Charles","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":147946,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":61695,"text":"gq710 - 1968 - Geologic map of the Cobb quadrangle, Trigg and Caldwell Counties, Kentucky","interactions":[{"subject":{"id":47113,"text":"ofr75377 - 1975 - Geologic map of the Cobhill 7 1/2-minute Quadrangle, east-central Kentucky","indexId":"ofr75377","publicationYear":"1975","noYear":false,"title":"Geologic map of the Cobhill 7 1/2-minute Quadrangle, east-central Kentucky"},"predicate":"SUPERSEDED_BY","object":{"id":61695,"text":"gq710 - 1968 - Geologic map of the Cobb quadrangle, Trigg and Caldwell Counties, Kentucky","indexId":"gq710","publicationYear":"1968","noYear":false,"title":"Geologic map of the Cobb quadrangle, Trigg and Caldwell Counties, Kentucky"},"id":1}],"lastModifiedDate":"2012-02-10T00:10:32","indexId":"gq710","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1968","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":316,"text":"Geologic Quadrangle","code":"GQ","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"710","title":"Geologic map of the Cobb quadrangle, Trigg and Caldwell Counties, Kentucky","language":"ENGLISH","doi":"10.3133/gq710","usgsCitation":"Seeland, D.A., 1968, Geologic map of the Cobb quadrangle, Trigg and Caldwell Counties, Kentucky: U.S. Geological Survey Geologic Quadrangle 710, 1 map :col. ;79 x 84 cm., https://doi.org/10.3133/gq710.","productDescription":"1 map :col. ;79 x 84 cm.","costCenters":[],"links":[{"id":103432,"rank":700,"type":{"id":15,"text":"Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_2018.htm","linkFileType":{"id":5,"text":"html"},"description":"2018"},{"id":247996,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/gq/0710/report.pdf","size":"38","linkFileType":{"id":1,"text":"pdf"}},{"id":252573,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/gq/0710/report-thumb.jpg"}],"scale":"24000","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -87.86749999999999,36.8675 ], [ -87.86749999999999,37 ], [ -87.75,37 ], [ -87.75,36.8675 ], [ -87.86749999999999,36.8675 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b0ae4b07f02db69c9fd","contributors":{"authors":[{"text":"Seeland, David A.","contributorId":85208,"corporation":false,"usgs":true,"family":"Seeland","given":"David","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":266247,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":3848,"text":"cir591 - 1968 - Direct-current arc and alternating-current spark emission spectrographic field methods for the semiquantitative analysis of geologic materials","interactions":[],"lastModifiedDate":"2017-06-25T15:32:26","indexId":"cir591","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1968","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":307,"text":"Circular","code":"CIR","onlineIssn":"2330-5703","printIssn":"1067-084X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"591","title":"Direct-current arc and alternating-current spark emission spectrographic field methods for the semiquantitative analysis of geologic materials","docAbstract":"Two spectrographic methods are used in mobile field laboratories of the U. S. Geological Survey. In the direct-current arc method, the ground sample is mixed with graphite powder, packed into an electrode crater, and burned to completion. Thirty elements are determined. In the spark method, the sample, ground to pass a 150-mesh screen, is digested in hydrofluoric acid followed by evaporation to dryness and dissolution in aqua regia. The solution is fed into the spark gap by means of a rotating-disk electrode arrangement and is excited with an alternating-current spark discharge. Fourteen elements are determined. In both techniques, light is recorded on Spectrum Analysis No. 1, 35-millimeter film, and the spectra are compared visually with those of standard films.","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/cir591","usgsCitation":"Grimes, D.J., and Marranzino, A., 1968, Direct-current arc and alternating-current spark emission spectrographic field methods for the semiquantitative analysis of geologic materials: U.S. Geological Survey Circular 591, iii, 6 p. :illus. ;26 cm., https://doi.org/10.3133/cir591.","productDescription":"iii, 6 p. :illus. ;26 cm.","costCenters":[],"links":[{"id":30922,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/circ/1968/0591/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":121291,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/circ/1968/0591/report-thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a82e4b07f02db64abea","contributors":{"authors":[{"text":"Grimes, D. J.","contributorId":73575,"corporation":false,"usgs":true,"family":"Grimes","given":"D.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":147717,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Marranzino, A. P.","contributorId":61798,"corporation":false,"usgs":true,"family":"Marranzino","given":"A. P.","affiliations":[],"preferred":false,"id":147716,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
]}