Spectrophotometric determination of fluorine in silicate rocks

Peck, Lee C.; Smith, Vertie C.

doi:10.1016/0039-9140(64)80192-2

Cited by 25 publications

(4 citation statements)

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“…by Upton et al (I97I, p. 165), except that F and C1 were determined by the spectrophotometric method of Peck and Smith (1964). In GGU 5o177, SiO2 was determined Narsarsukite analysis I 2 gravimetrically, A12Oa by the method of Mercy and Saunders (I966), total iron, CaO, MgO, and MnO by atomic absorption spectrometry, TiO2 and P205 spectrophotometrically, F by the method of Peck and Smith (1964), FeO and H20 as for GGU 50176, and Na~O and K20 by flame-photometry.…”

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confidence: 99%

Narsarsukite: a new occurrence in peralkaline trachyte, south Greenland

et al. 1976

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SUMMARY. A flinty, spherulitic dyke of peralkaiine trachyte in a Precambrian dyke-swarm consists mainly of albite and aegirine. Within this, euhedral crystals of narsarsukite, NadTi,Fe)Si401o(F), occur as short prisms elongate parallel to c. This distinguishes them from all previously described narsarsukites, which have tabular habits. Minor phases present include micas, apatite, quartz, pectolite, nordite, and a thorium silicate. Probe analyses are presented for narsarsukite, aegirine, aibite, biotite, apatite, pectolite, nordite, and the thorium silicate.On mineralogical and geochemical grounds it is unlikely that the narsarsukite-bearing dyke is a differentiate of supposedly mantle-derived basalt-trachyte-comendite magmas in the region. The dyke is colinear with a comendite dyke exposed at lower altitude and it is suggested that the narsarsukite-bearing dyke developed as a rhcomorphic fenite generated by reaction between quartz diorite basement and fugitive alkaline solutions from the subjacent comendite. NARSARSUKITE is a rare titanosilicate known only in close association with highly alkaline igneous intrusions and is generally confined to silica-oversaturated granites, syenites, and fenites. It is a chain silicate with tetragonal symmetry and a composition of approximately Na~(Ti,Fe)Si4On with four formula units per unit cell (Warren and Amberg, I934; Pyatenko and Pudovkina, I96i ). It may, however, contain some hydroxy and/or halide ions and the formula is quoted by Vlasov et al. (I966) as Na2(Ti,Fe)Si4Olo(OH,F) and by Semenov (I969) as NasTisFeSilsO43F.The localities from which it has hitherto been recorded include the type locality at Narssarssuk, South Greenland (Flink, 19Ol ; Boggild, 1953), Ilimaussaq, South Greenland (Semenov, 1969), Montana (Graham, I935; Stewart, I959), Sudan (J6r6mine and Christophe-Michel-L6vy, I96I), Oslofjord (Saebo, 1966), Quebec (Rajasekaran, 1966), Kola Peninsula (Vlasov et al., I966), and East Greenland (Bearth, 1959).This account concerns a previously undescribed locality on the island of Igdlutalik some 45 km west of the type locality and approximately 12 km west of the Ilimaussaq complex, in which the mineral occurs as euhedral crystals within a dyke of peralkaline trachyte.FieM occurrence. The narsarsukite-bearing dyke occurs among a prominent swarm of ENE.-WSW. trending alkaline dykes that extends through the Ilimaussaq peninsula and the Tugtut6q district (Upton, 1974). The swarm involves dykes of alkali olivine basaltic and trachybasaltic composition together with trachytes, phonolites, 9

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confidence: 99%

Narsarsukite: a new occurrence in peralkaline trachyte, south Greenland

et al. 1976

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“…The molecular ratio of alkalis to alumina is 1.8, whereas typical calc-alkalic rhyolites have a ratio of less than 1 and comendites a ratio only slightly greater than 1. The analysis is very similar to those of hyalopantellerites (table 1, columns Peck and Tomasi ( 1959) and Peck and Smith (1964). Aluminum oxide value represents gravimetric determination of 10.50 eorrected for Zr02 and for Be, Nb, Th, and rare-earth oxides, whkh are included under "other".…”

Section: Chemistrymentioning

confidence: 54%

Geological Survey research 1965, Chapter B

1965

Professional Paper

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“…A comparison of the fluorine contents of several U.S. Geological Survey standard rocks and of other rocks and soils, as determined by the known-increment addition method with the amounts as determined by several other methods, is also given in the table. Fluorine was seprated by distillation prior to measurement on all of the values reported by Peck andSmith (1964) andW. D. Goss (oral commun., 1969).…”

Section: Experiments and Resultsmentioning

confidence: 99%

“…Reynolds and Hill (1939) incorporated many of these improvements in a method for determining fluorine in natural phosphates and phosphatic fertilizers. Later, Peck and Smith (1964) offered an improved fluorine measurement based on the stable colored complex formed between fluorine and a zirconium-SPADNS (sodium salt of 2-(4-sulfophenylazo)-l,8-dihydroxynaphthalene-3,6-disulfonic acid) reagent. Their method retained the steam distillation step, especially for silicate rocks in which the fluorine contents are in the range of a few hundred parts per million.…”

Section: Introductionmentioning

confidence: 99%

New and refined methods of trace analysis useful in geochemical exploration

Ward¹

1975

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Antimony in soils and rocks is solubilized by fusing the sample with potassium pyrosulfate and digesting the melt from the fusion with 8 N hydrochloric acid. The antimony is then extracted into MIBK (methyl isobutyl ketone, which is the common name for 4-methyl-2-pentanone) and determined by atomic absorption spectrophotometry. As little as 1 ppm antimony can be detected in the sample, with a precision and accuracy comparable to that of the rhodamine B colorimetric method. APPARATUS Atomic absorption spectrophotometer, Perkin-Elmer model 403 or equivalent. 1 Centrifuge, International, Size 2, model K, or other centrifuge of similar performance capable of 1,200 to 8,500 r/min and centrifugal force of 380 to 4,400 times gravity. Culture tube, screwcap, 16 by 150 mm. Culture tube, screwcap, 25 by 150 mm. Fusion rack (Marranzino and Wood, 1956), consisting of a rotating disk to which as many as 11 tubes can be clipped and their contents fused as they pass over a group of Bunsen burners.

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Spectrophotometric determination of fluorine in silicate rocks

Cited by 25 publications

References 3 publications

Narsarsukite: a new occurrence in peralkaline trachyte, south Greenland

Narsarsukite: a new occurrence in peralkaline trachyte, south Greenland

Geological Survey research 1965, Chapter B

New and refined methods of trace analysis useful in geochemical exploration

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