138La β-decay constant estimated from geochronological studies

Masuda, Akimasa; Shimizu, Hiroshi; Nakai, S.; Makishima, Akio; Lahti, Seppo I.

doi:10.1016/0012-821x(88)90119-7

Cited by 18 publications

(9 citation statements)

References 16 publications

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“…We have also measured the isotopic composition of the Johnson Matthey reference material, JMC-304, frequently used as the Ce isotope reference material in previous studies (Tanaka and Masuda, 1982;Shimizu et al, 1984Shimizu et al, , 1988Shimizu et al, , 1990Shimizu et al, , 1992Shimizu et al, , 1996Masuda et al, 1988;Amakawa et al, 1991;Makishima and Nakamura, 1991;Lee et al, 2001;Tanimizu and Tanaka, 2002;Hayashi et al, 2004;Tanimizu et al, 2004;Tazoe et al, 2007). The values published for this reference material display a large scatter.…”

Section: Ames and Jmc-304 Reference Materialsmentioning

confidence: 98%

“…Our Ce isotope dataset includes two basaltic rock standards (BCR-2 and BHVO-2) and two Ce reference material solutions (AMES and JMC-304) documented in previous publications (Tanaka and Masuda, 1982;Shimizu et al, 1984Shimizu et al, , 1988Shimizu et al, , 1990Shimizu et al, , 1992Shimizu et al, , 1994Masuda et al, 1988;Amakawa et al, 1991;Makishima and Nakamura, 1991;Lee et al, 2001;Tanimizu and Tanaka, 2002;Hayashi et al, 2004;Tanimizu et al, 2004;Tazoe et al, 2007;Willbold, 2007). In a second part, we focus on the Lesser Antilles arc formed by the subduction of the Atlantic ocean lithosphere beneath the Caribbean plate for which a comprehensive set of geochemical data has already been published on both the arc lavas and the sediments present in front of the subduction zone (Carpentier et al, 2008(Carpentier et al, , 2009Labanieh et al, 2010Labanieh et al, , 2012.…”

Section: Introductionmentioning

confidence: 99%

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Ce isotope systematics of island arc lavas from the Lesser Antilles

Bellot

Boyet

Doucelance

et al. 2015

Geochimica et Cosmochimica Acta

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Section: Ames and Jmc-304 Reference Materialsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Ce isotope systematics of island arc lavas from the Lesser Antilles

Bellot

Boyet

Doucelance

et al. 2015

Geochimica et Cosmochimica Acta

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“…The Lovbole pegmatite (Fig. 2) is dated at 1807 i 3 Myr by a Sm-Nd mineral isochron age (Masuda et aL, 1988) and pegmatites in the Skildo area ( Fig. 1) yield RbSr muscovite ages of 1870 Myr (Hopgood ef al., 1983).…”

Section: Tectonic Settingmentioning

confidence: 98%

Late‐orogenic Svecofennian deformation in SW Finland constrained by pegmatite emplacement ages

et al. 1996

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Late stages of the Svecofennian orogeny in SW Finland were related to a tranpressional stress field and dextral movements along crustal scale shear zones under decreasing temperature and pressure conditions. In the Kemiö area, a minimum estimate for the time span of movements along one of these shear zones is obtained from the ages of 1840 to 1830 Myr‐old microcline granite sheets, related to early ductile deformation, and by dating structurally late rare‐mineral granite pegmatites, related to brittle deformation. One pegmatite was emplaced when the rheological conditions in the gabbro changed from ductile to semi‐ductile and brittle. It has U‐Pb ferrotapiolite ages ranging between 1807.0 ± 2.9 Myr (2 s̀) and 1803.1 + 2.9/ ‐2.0 Myr (2 s̀). Another pegmatite emplaced under brittle conditions has an U‐Pb ferrotapiolite age of 1802.9 ± 1.3 Myr (2 s̀). These pegmatites were emplaced preferentially in gabbroic rocks, that showed brittle to semi‐ductile deformation at a time when their more felsic host‐rocks still showed ductile deformation. The age range bracketed by the microcline granite sheets and the structurally late pegmatites indicates that ductile deformation related to the transpressional Late Svecofennian tectonic regime in southwestern Finland, persisted for at least 30–40 Myr.

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“…The Sm-Nd isochron age of allanite, apatite, gadolinite and garnet of one of the pegmatites (Lövböle, Fig. 3) is 1807±3 (Masuda et al, 1988). The pegmatites are spatially related to a large 1.83 Ga (Suominen, 1991) microcline granite intruded into 1.88 Ga (Huhma, 1986) early Svecofennian schists and granitoids.…”

Section: Geological Background and Samplingmentioning

confidence: 97%

Determination of trace element profiles in coarse-grained minerals by external millibeam PIXE - A schorl tourmaline study

Lindroos¹,

Lill²,

Saarela³

et al. 1995

Bull Geol Soc Finland

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The thick-target PIXE technique was applied to direct analysis of trace elements in tourmaline minerals. Analyses of these minerals with conventional wet-chemical methods are difficult and time consuming. The PIXE analyses were carried out in air with a collimated proton beam. As the technique was used in combination with a polarizing microscope it provided excellent control over the spots analyzed. A scanning device was developed for remote-controlled spot analyses across the surface of the samples. Several scans were run across polished sections of multicrystal schorl-tourmaline aggregates. Pellets of crushed and ground tourmaline samples were also analyzed. The method was calibrated against USGS standard reference materials. The precision of the method varied between 1 and 10 % and the detection limits were 1-10 ppm for most of the elements analyzed. Different sets of X-ray absorbers were used to improve the sensitivity and reliability of the method for the elements of interest. The concentrations of fourteen elements were calculated from their X-ray yields and the fluorine content was simultaneously determined using the 109.8 keV gamma line. The tourmaline samples were taken from a complex granite pegmatite on the Kimito island in SW Finland. They were found to contain mainly elements with Z < 33 (lighter than As). Relatively high concentrations of Fe, Zn, Ga and F were observed. Zinc was found to be a geochemically important minor element in schorl with a concentration ranging from 0.10 to 0.28 %. The pellets were found to contain inclusions of other minerals.

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138La β-decay constant estimated from geochronological studies

Cited by 18 publications

References 16 publications

Ce isotope systematics of island arc lavas from the Lesser Antilles

Ce isotope systematics of island arc lavas from the Lesser Antilles

Late‐orogenic Svecofennian deformation in SW Finland constrained by pegmatite emplacement ages

Determination of trace element profiles in coarse-grained minerals by external millibeam PIXE - A schorl tourmaline study

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