Post-Variscan metamorphism in the Apuseni and Rodna Mountains (Romania): evidence from Sm–Nd garnet and U–Th–Pb monazite dating

2018 ◽  
Vol 112 (1) ◽  
pp. 101-120 ◽  
Author(s):  
Martin Kaspar Reiser ◽  
Gavril Săbău ◽  
Elena Negulescu ◽  
Ralf Schuster ◽  
Peter Tropper ◽  
...  
Keyword(s):  
Monazite Dating ◽  
Variscan Metamorphism

scholarly journals CHIME monazite dating: Pb analysis on an RR = 100 mm spectrometer and correction of interferences between Th, U, and Pb with natural monazite

2017 ◽  
Vol 112 (2) ◽  
pp. 88-96 ◽  
Author(s):  
Mayuko SHIMIZU ◽  
Kenji SHIBATA ◽  
Kazuhiro SUZUKI ◽  
Shigeru SUEOKA ◽  
Masakazu NIWA
Keyword(s):  
Monazite Dating

scholarly journals The Conlara Metamorphic Complex: Lithology, provenance, metamorphic constraints on the metabasic rocks, and chime monazite dating

2020 ◽  
pp. 103065
Author(s):  
Mónica G. López de Luchi ◽  
Carmen I. Martínez Dopico ◽  
Kathryn A. Cutts ◽  
Bernhard Schulz ◽  
Siegfried Siegesmund ◽  
...  
Keyword(s):  
Metamorphic Complex ◽  
Monazite Dating

scholarly journals Variscan Metamorphism

2019 ◽  
pp. 431-495
Author(s):  
M. L. Ribeiro ◽  
J. Reche ◽  
A. López-Carmona ◽  
C. Aguilar ◽  
T. Bento dos Santos ◽  
...  
Keyword(s):  
Variscan Metamorphism

Clay mineral evidence for low-grade Caledonian and Variscan metamorphism in south-western Dyfed, south Wales

1980 ◽  
Vol 43 (331) ◽  
pp. 857-863 ◽  
Author(s):  
D. Robinson ◽  
R. A. Nicholls ◽  
L. J. Thomas
Keyword(s):  
Lower Cambrian ◽  
Volatile Matter ◽  
Low Grade ◽  
X Ray Diffraction ◽  
Illite Crystallinity ◽  
X Ray ◽  
South Wales ◽  
Mineral Assemblages ◽  
Variscan Metamorphism ◽  
Pelitic Rocks

SummaryIllite crystallinity determinations on Palaeozoic pelitic rocks, whose stratigraphic range runs from Lower Cambrian to Westphalian, indicate that anchimetamorphism has affected both the Lower and Upper Palaeozoic sequences. Two metamorphic episodes are in evidence, with the earlier, Caledonian, being of slightly higher grade. The higher anchizone crystallinity values are recorded from the Fishguard area in which mineral assemblages of the prehnite-pumpellyite facies have recently been recognized in basic igneous rocks. The later metamorphic episode has affected rocks to the south of the Variscan front. Here crystallinity values are low anchizone but some straddle the boundary with the diagenetic state. The Pembroke coalfield lies in this southern area and has coals largely of anthracite rank with volatile matter contents of between 10.1 and 5% Grade of metamorphism as indicated by crystallinity and by coal rank data from the Pembroke coalfield shows anomalous results to that described from the main South Wales coalfield. A neo-formed 2M illite from the Variscan spaced cleavage is described with analytical and X-ray diffraction data.

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