Some New Variation Diagrams for Groups of Igneous Rocks

Larsen, Esper S.

doi:10.1086/624645

Cited by 39 publications

(19 citation statements)

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“…Neutron-activation analyses for tantalum on eight selected rocks ranging in composition from olivine norite to a highly siliceous quartz monzonite are listed in table 1. Figure 1 shows the relation of the tantalum content of the rocks to their chemical composition, on a variation diagram of the type proposed by Larsen (1938). These data clearly show that tantalum is indeed an extremely rare element, inasmuch as none of these rocks contains more than half a part per million tantalum.…”

Section: Tantalum In Rocksmentioning

confidence: 74%

Geological Survey research 1965, Chapter B

1965

Professional Paper

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Section: Tantalum In Rocksmentioning

confidence: 74%

Geological Survey research 1965, Chapter B

1965

Professional Paper

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“…In a Larsen diagram the abscissa parameters reflect the variation of major oxide constituents with differentiation, and it may be concluded that, where smooth curves result from plots of a group of rock analyses, these rocks are co-magmatic (Larsen 1938). The trend of the curves also indicates the trend of magmatic evolution.…”

Section: Larsen Variation Diagrammentioning

confidence: 99%

Timiskaming volcanism in the Kirkland Lake area, Ontario, Canada

Cooke¹,

Moorhouse²

1969

Can. J. Earth Sci.

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The petrography and chemistry of the Timiskaming volcanics of the Kirkland Lake area reveal three distinct yet intimately associated suites within a composite volcanic-sedimentary sequence. The initial phase of Timiskaming volcanism was characterized by calc-alkaline lavas; which are transitional between the later alkaline volcanics of the Timiskaming and the underlying calcic Keewatin greenstones. Flows of alkalic mafic trachytes and a variety of leucitic lavas and pyroclastic rocks are the latest differentiates represented. This occurrence of leucitic volcanics is the first reported anywhere in the Precambrian. Deposition of sedimentary rocks and intrusions of syenite and mafic syenites were contemporaneous with the period of volcanism, but intrusions of feldspar porphyry were post-Timiskaming.The major mineral constituents are augite, biotite, plagioclase, leucite, and their alteration products. Potash feldspar and hornblende occur in subsidiary amounts, and magnetite and apatite are the common accessory minerals. The chemical composition of this volcanic sequence is marked by high alkalies, A1203, and low SiOZ, P20,, and TiOz. The calc-alkaline and alkaline lavas are rich in Na20 and poor in K 2 0 and BaO, whereas the leucite lavas are high in K,O and BaO, and comparatively low in Na20.The Kirkland Lake sequence is compared with similar exotic, but less altered, lavas of more recent age in order to clarify further the nature of Timiskaming volcanism. The alkalic association of the Kirkland Lake area is similar to those occurring at a late stage in the volcanic cycle of modern volcanic arcs and along orogenic belts marginal to major continental masses.'Present address : Cominco, Exploration, 800-1 199

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“…The few picrite instrusives consist mainly of olivine, pyroxene and biotite. Larsen (1938). Figure 27.3 shows the relation between the Th/U ratios of the rocks and their chemical composition.…”

Section: B-70mentioning

confidence: 99%

“…These data. show a clear trend toward increasing Figure 27.1 shows a plot of the thorium and uranium data on a variation diagram of the type proposed by Larsen (1938). Figure 27.3 shows the relation between the Th/U ratios of the rocks and their chemical composition.…”

mentioning

confidence: 94%

Short papers in geology, hydrology, and topography; Articles 1-59: Geological Survey Research 1962

1962

Professional Paper

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FOREWORDThis collection of 59 short papers on subjects in the fields of geology, hydrology, topography, and related sciences is one of a, series to be relea~ed during the year as chapters of Professional Paper 450. The papers in this chapter report on the scientific and economic· results of current work by members of the Geologic, Topographic, and 'Vater Resources Division of the United States Geological Survey. Some of the pa.pers annom1ce new discoveries or present observations on problems of limited scope; other papers draw conclusions from more extensive or continuing investigations that in large part will be discussed in greater detail in reports to be published in the future.Chapter A of this series, to be published later in the year, will present a synopsis of results from a wide range of work done during the present fiscal year. · THOl\rAs B. NoLAN, Director. rn CONTENTSP~i:ge Foreword---------------------------------------~----------------------------------------------------------- JU GEOLOGIC STUDIES Economic geologyl. Stratigraphic and structural controls of mineralization in the Taylor mining district near Ely, Nevada, by Harald Drewes----~-----~--------------------------------------------------------------------------------B-1 .; 2. Suggestions for prospecting in the Humboldt Range and adjacent areas, Nevada, by Robert E. Wallace and Donald B. Tatlock- --------~-----------------------------------------------------------------------3 I'Structural geology 3. Possible detachment faults in the Teepee Creek quadrangle, Gallatin County, Montana, by Irving J. Witkind __ _ 6 4. Hydrogeologic evidence of the extension of the E~;tst Range fault, Humboldt and Pershing Counties, Nevada,by Philip Cohen--------------------------------------~----------------------------~---------------9......,., --------------------------------------------------------- T. Haugen----------------------------------------------------------------------------------------53Paleontology 21. Marginal sea of middle Eocene age in New Jersey, by Stephen M. Herrick __ ------. --------------------------56 22. Recent discoveries of the Cretaceous ammonite Haresiceras and their stratigraphic significance, by William A. Cobban------------------------------------------------------------------------------------------- . Brown---------------------~------------------------------------------------------~------ E. Ward---------------------------------------------------------------------------------------- McKenzie_------------------------------------------------------------------------------------------ INDEXES Subject------------------------------------------~--------------------------------------------------------143 Author------------------------------------------------------------------------------------~--------------145..~· .... GEOLOGICAL SURVEY RESEARCH 1962SHORT PAPERS IN GEOLOGY, HYDROLOGY, AND TOPOGRAPHY, ARTICLES 1-59 GEOLOGIC STUDIESECONOMIC GEOLOGY STRATIGRAPHIC AND STRUCTURAL CONTROLS OF MINERALIZATION IN THE TAYLOR MINING ,DISTRICT...

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Some New Variation Diagrams for Groups of Igneous Rocks

Cited by 39 publications

References 0 publications

Geological Survey research 1965, Chapter B

Geological Survey research 1965, Chapter B

Timiskaming volcanism in the Kirkland Lake area, Ontario, Canada

Short papers in geology, hydrology, and topography; Articles 1-59: Geological Survey Research 1962

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