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, Comparable Study on the Effect of Errors and Uncertainties of Heat Transfer Models on Quantitative Evaluation of Thermal Alteration in Contact Metamorphic Aureoles: Thermophysical Parameters, Intrusion Mechanism, Pore-Water Volatilization and Mathematical Equations, International Journal of Coal Geology, vol.95, pp.12-19, 2012.
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,
,
, , 2012.
, Calcul de la propagation par conduction de la chaleur injecté dans une croûte composée de 6 couches. D'après Taupo.m de Catherine Annen
, M1=(Mod ==, vol.1
, M2=(Mod ==, vol.2
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, M7=(Mod ==, vol.7
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, T1=(T(:,i:i+10)<200 & T(:,i:i+10)>100)
, T2=(T(:,i:i+10)<300 & T(:,i:i+10)>200)
, T3=(T(:,i:i+10)<400 & T(:,i:i+10)>300)
, T4=(T(:,i:i+10)<500 & T(:,i:i+10)>400)
, T5=(T(:,i:i+10)<600 & T(:,i:i+10)>500)
, T6=(T(:,i:i+10)<700 & T(:,i:i+10)>600)
, T7=(T(:,i:i+10)<800 & T(:,i:i+10)>700)
, T8=(T(:,i:i+10)<900 & T(:,i:i+10)>800)
, T9=(T(:,i:i+10)<1000 & T(:,i:i+10)>900)
, T10=(T(:,i:i+10)<1100 & T(:,i:i+10)>1000)
, T11=(T(:,i:i+10)<1200 & T(:,i:i+10)>1100)
, AA=
,
,
, Guillaume d a iSTeP-UMR 7193, Université Pierre et Marie Curie-P6, 4 place Jussieu, F-75252 Paris Cedex 05, France b Géosciences Environnement Toulouse (GET) et UMR 5563, p.14
,
, We characterize a long-lived plutonic activity during all the Paleozoic in this part of the Pyrenean crust. The Bélesta unit (amphibolite facies) is mainly composed of sills of Latest Precambrian-Earliest Cambrian (542 ± 4-540 ± 4 Ma time span) orthogneisses (70% of the series), almost unknown in the Pyrenes until now, and Late Carboniferous, p.15
, AG210E and AG210G granites have been dated at 297.0 ± 3.2 Ma and 306.4 ± 3.0 Ma respectively, i.e. Latest Carboniferous-Earliest Permian. It is noteworthy that both granites AG210E and AG210G also contain zircon cores and grains yielding consistent ages, vol.537
, , 2004.
, this unit, 1,200 to 1,500 m thick, is also mainly composed of Late Proterozoic quartzofeldspathic paragneisses ('Caramany gneisses'), with the exception of two plutonic intrusions, the 'Ansignan charnockite, 1970.
, Vielzeuf, 1996) and the 'Cassagnes granite', both attributed to the Carboniferous. The following data, 1982.
, Some tens of metres of a generally white orthogneiss with abundant lens-shaped K-feldspars (AG211A, AG211B) also constitute the lower part of the unit. The grt ± bt ± opx-bearing quartzofeldspathic fine grained rocks generally strongly foliated and/or mylonitized (AG228), the so-called 'Caramany gneisses' (Fonteilles, 1976; Delay, p.800, 1990.
, AG37) with no or rare solid state deformation represent most of the western part of the unit. Locally, some metres to tens of metres (up to 90 m near Trilla) of a fine-grained, generally concordant, norite (AG02G) are associated with these rocks. The contact between the laccolith and its country-rock, especially the orthogneisses and the calcsilicate-bearing paragneisses, is magmatic. A few km to the east of Ansignan, in the Caramany area, some m-thick sills of charnockite (AG185B, AG185D) and grt-bearing leucogranite (AG185E) may represent the lateral equivalent of the Ansignan laccolith but, m thick laccolith of hypersthene-bearing granodiorite (Ansignan charnockite) (AG36, AG01Ch, AG02Ch) and generally concordant metre-thick sills of a garnet-bearing leucogranite, vol.01
, more or less transformed into orthogneiss and mylonitic, the 'Cassagnes granite', forms a pluri-metre thick sill in the upper part of the Caramany unit. A brief description of the thin-sections corresponding to the samples dated in this study, and some other samples typical of this unit, porphyritic granodiorite without opx (AG230)
, 10) in the peraluminous rocks area, near the peraluminous / metaluminous boundary (A/CNK = 1), and around the I-type / S-type granites boundary (A/CNK = 1.1), like the orthogneisses and granites of the Bélesta unit, orthogneiss (AG211A) plots, on the Shand diagram
, 459) and Touil (1996) have very similar compositions.The grt + opx-bearing quartzofeldspathic fine-grained rock (AG228) does not plot in the same area and displays much higher A/CNK and A/NK ratios, because of a rather high content in Al 2 O 3 (16.28%); it also shows very low K 2 O content (1.72%) and high FeO content (9.23%). The norite AG02G is characterized by a low A/CNK ratio and a high A/NK ratio. The multi-element mantle-normalized spectra (Fig. 11a) are rather similar, however with stronger negative anomalies in Ta, Nb and Ti for the grtleucogranite and a negative anomaly in Th for the norite. The REE patterns (Fig. 11b) show two groups of rocks, one group (the orthogneiss, the grt-bearing leucogranite, the norite and the grt + opx-bearing quartzofeldspathic rock) with moderately fractionated REE ([La/Yb] N ratios of 3.91, 9.24, 6.20 and 5.31 respectively) and flat heavy REE patterns, The magmatic charnockite (AG01Ch, close to AG36, and AG02Ch) and a leucogranite (AG01L) associated with this charnockite, the mylonitized charnockite (AG185B) and the Cassagnes granodiorite (AG230), plot near the same boundaries but with higher A/NK ratios. Other samples of the charnockite analysed by Vielzeuf, 1996.
, SiO 2 diagram (Fig. 6), all the plutonic rocks of the Caramany unit here analysed belong to the calc-alkaline-(subalkaline) domain, like the plutonic rocks of the Bélesta unit
, U/Pb dating of rocks from the Caramany unit The U-Pb diagrams are reported in the Fig. 12. Samples AG36
, AG228 (mylonitized grt+opx-bearing quartzofeldspathic rock), and AG211A (porphyritic orthogneiss) have been dated by U/Pb on separated zircons, AG185B
, Cassagnes granite') has been dated by U/Pb on zircons in petrographic thin-section during the same session (localisation of these samples on Fig 1b), p.230
, The AG211A orthogneiss displays an age of 518.9 ± 5.3 Ma (Early Cambrian)
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