An accurate computer correction program for quantitative electron probe microanalysis

Merlet, Claude

doi:10.1007/bf01244563

Cited by 310 publications

(146 citation statements)

References 15 publications

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“…As an additional test, the geochemical composition was determined on several thin sections using a CAMECA SX-100 electron microprobe at the University de Montpellier II (France). Microprobe analysis correction is based on Merlet (1994). The microprobe analyses were consistent with the ICP-AES data for Ca, Mg, Mn, Fe, Sr and K, whereas the Al content determined by microprobe was slightly higher than that by ICP-AES.…”

Section: Methodssupporting

confidence: 68%

Linking process, dimension, texture, and geochemistry in dolomite geobodies: A case study from Wadi Mistal (northern Oman)

Vandeginste¹,

John²,

Flierdt³

et al. 2013

Bulletin

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Understanding the distribution and geometry of reservoir geobodies is crucial for netto-gross estimates and to model subsurface flow. This paper focuses on the process of dolomitization and resulting geometry of diagenetic geobodies in an outcrop of Jurassic host rocks from northern Oman. Field and petrographic data show that a first phase of stratabound dolomite is crosscut by a second phase of fault-related dolomite. The stratabound dolomite geobodies are laterally continuous for at least several hundreds of meters (~1000 ft) and probably regionally and are half a meter (1.6 ft) thick. Based on petrography and geochemistry, a process of seepage reflux of mesosaline or hypersaline fluids during the early stages of burial diagenesis is proposed for the formation of the stratabound dolomite. In contrast, the fault-related dolomite geobodies are trending along a fault that can be followed for at least 100 Running head:Linking process, dimension, texture and geochemistry in dolomite geobodies

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Section: Methodssupporting

confidence: 68%

Linking process, dimension, texture, and geochemistry in dolomite geobodies: A case study from Wadi Mistal (northern Oman)

Vandeginste¹,

John²,

Flierdt³

et al. 2013

Bulletin

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“…A special program, analyzing the alkalies first, was employed for feldspars. A new accurate computer correction program (Merlet, 1994) was used to calculate the elemental concentrations. The microprobe analyses are available on the CD-ROM in the back pocket of this volume, but representative analyses are given in Tables 2−7 at the end of this chapter.…”

Section: Methodsmentioning

confidence: 99%

Mineral chemistry of volcanic sequences from Hole 917A, southeast Greenland Margin

Demant¹

1998

Proceedings of the Ocean Drilling Program

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During Ocean Drilling Program Leg 152, a 779-m-thick volcanic sequence was drilled at Hole 917A, on the feather edge of the seaward-dipping reflector sequence. The volcanic succession, which erupted under subaerial conditions, was subdivided into three series (Upper, Middle, and Lower) and 92 flow units. The Upper Series comprises picrites and olivine-phyric basalts. The Middle Series basalts are more evolved, and dacitic lavas and tuffs were erupted at the base of this series. Lavas from the Lower Series show a wider compositional range. A detailed mineralogical study of the different petrographical types shows that olivine is the principal phenocryst phase in the basalts, whereas clinopyroxene and plagioclase are the main components of the groundmass. High-Mg olivines (up to Fo 92.4 ) with chrome-spinel inclusions are abundant in the picrites and olivine-phyric basalts. Fo-content of the olivine decreases as a function of the composition of the whole rock except in some aphyric basalts with ophitic textures where the olivine underwent further re-equilibration during cooling. Plagioclase exhibits a large compositional range from bytownite (An 91 ) in the more primitive basalts to oligoclase (An 21 ) for the late crystallizing feldspar in the ophitic textures. Plagioclases from the Upper Series lavas are very poor in K 2 O. The presence of bytownite phenocrysts (An 86− 66 ) associated with sodic sieve-textured plagioclase (An 36−26 ) in the dacite (Unit 54) clearly demonstrates that this lava is a mixed lava. Pyroxenes are mainly clinopyroxene, but pigeonite and orthopyroxene were found in the matrix of some differentiated basalts with ophitic textures. The low Ti contents of the pyroxenes and the evolution trends are typical of tholeiitic lavas. The development of sector zoning in pyroxene microphenocrysts of the more differentiated basalts has a scattering effect on the distribution of the points on the pyroxene quadrilateral. Opaque oxides crystallize late and are mainly titanomagnetite. Ilmenite is also present in some lavas.The volcanic succession drilled at Hole 917A presents many petrographical and mineralogical similarities to the flood basalts of the Scoresby Sund region in East Greenland. These thick basaltic sequences, which characterize the North Atlantic volcanic rifted margins, were emplaced during a short time interval during the phase of continental breakup. The Lower and Middle Series have evolved in crustal magma chambers. The frequency of picrites in the Upper Series emphasizes an easier access of more primitive magmas to the surface during the final phase of rifting.

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“…Major element concentrations (Table 1) of individual grains picked from the mineral separates (cpx-Fe, cpx-Mg, plagioclase and ilmenite) of LAP 02205 were determined by wavelength-dispersive electron microprobe (EMP) using a focused beam with an acceleration voltage of 15 kV, 20 nA beam current, 20 sec peak count times, 2x10 sec count times for a two-sided background determination, a φ(ρΖ) data reduction (Merlet, 1994), and calibrated against natural mineral standards. The melt veins were analyzed under the same conditions but using a 20 µm diameter defocused beam.…”

Section: Major and Trace Element Analyses Of Mineral Separatesmentioning

confidence: 99%

A Rb–Sr and Sm–Nd isotope geochronology and trace element study of lunar meteorite LaPaz Icefield 02205

Rankenburg

Brandon

Norman

2007

Geochimica et Cosmochimica Acta

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An accurate computer correction program for quantitative electron probe microanalysis

Cited by 310 publications

References 15 publications

Linking process, dimension, texture, and geochemistry in dolomite geobodies: A case study from Wadi Mistal (northern Oman)

Linking process, dimension, texture, and geochemistry in dolomite geobodies: A case study from Wadi Mistal (northern Oman)

Mineral chemistry of volcanic sequences from Hole 917A, southeast Greenland Margin

A Rb–Sr and Sm–Nd isotope geochronology and trace element study of lunar meteorite LaPaz Icefield 02205

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