Petrology of the alkaline magmatism from the Cretaceous North-Pyrenean Rift Zone (France and Spain)

Azambre, Bernard; Rossy, Michel; Albarède, Francis

doi:10.1127/ejm/4/4/0813

Cited by 40 publications

(37 citation statements)

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“…However, similarly high concentrations and extensive variations of LIL elements were also described from several lamprophyres (e.g. Azambré et al, 1992;Dostal and Owen, 1998;Rock, 1991;Szabó et al, 1993). K 2 O, Rb, Ba and Sr show wide scatter with mg#, without obvious evolution with the differentiation, which can be explained by their mobility (Fig.…”

Section: Major and Trace Element Geochemistrysupporting

confidence: 67%

“…%; Al 2 O 3 <13.6 wt. %), similar to the amphiboles of the Monteregian (Bédard, 1988), Tamazert (Bouabdli et al, 1988), Pyrenean (Azambré et al, 1992), Moravian-Silesian, Mecsek-Alföld (Harangi et al, 2003) and Catalonian (Ubide et al, 2012) lamprophyres. Compositional trends for kaersutites are consistent with early crystallisation from Si-undersaturated magma (Bédard, 1988;Giret et al, 1980 (Adam and Green, 1994).…”

Section: Amphibolementioning

confidence: 56%

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Petrogenetic significance of ocellar camptonite dykes in the Ditrău Alkaline Massif, Romania

Batki

Pál-Molnár

Dobosi

et al. 2014

Lithos

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Camptonite dykes intrude the rift-related Mesozoic igneous body of the Ditrău Alkaline Massif, Eastern Carpathians, Romania. We present and discuss mineral chemical data, major and trace elements, and the Nd isotopic compositions of the dykes in order to define their nature and origin. The dykes are classified as the clinopyroxene-bearing (camptonite-I) and clinopyroxene-free (camptonite-II) varieties. Camptonite-I consists of aluminian-ferroan diopside phenocrysts accompanied by kaersutite, subordinate Ti-rich annite, albite to oligoclase and abundant calcite-albite ocelli. Camptonite-II comprises K-rich hastingsite to magnesiohastingsite, Ti-rich annite, albite to andesine, abundant accessory titanite and apatite, and silicate ocelli filled mainly with plagioclase (An 4-34 ). A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT

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Section: Major and Trace Element Geochemistrysupporting

confidence: 67%

Section: Amphibolementioning

confidence: 56%

Petrogenetic significance of ocellar camptonite dykes in the Ditrău Alkaline Massif, Romania

Batki

Pál-Molnár

Dobosi

et al. 2014

Lithos

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“…The age of about 100 Ma reported for a single muscovite grain from this area suggests that the thermal anomaly started to develop earlier, which is in accordance with the 40 Ar-39 Ar data reported further east in the Arignac and Trimouns places (100-109 Ma) as well as with the 40 K-40 Ar age of Les Plagneaux gabbros (107-109 Ma; Montigny et al, 1986) and the U-Pb age of several metasomatic albitite bodies in the eastern Pyrenees drothermal activity is restricted to a shorter period as indicated by 40 Ar-39 Ar and U-Pb ages close to 100 Ma. Alteration and recrystallization of some of the NPZ Cretaceous alkaline magmatic rocks by the HT-LP metamorphism indicate that magmatism cannot account for the regional thermal anomaly (Azambre, 1967;Azambre et al, 1971Azambre et al, , 1992Azambre and Rossy, 1976;Ternet et al, 1997;Azambre and Monchoux, 1998). Consistently, the present-day distribution of the Cretaceous magmatic rocks is clearly not correlated to the distribution of the isograds.…”

Section: Timing and Relationship Between Metamorphism And Magmatismsupporting

confidence: 49%

“…The North Pyrenean realm is affected by moderate but welldistributed magmatic activity during the Mesozoic, responsible for the emplacement of two main groups of rocks: (i) tholeitic dolerites of Triassic age, generally referred to as "ophites" (Montigny et al, 1982;Azambre et al, 1987), and (ii) a wide variety of small intrusive and effusive Cretaceous alkaline magmatic rocks (Montigny et al, 1986;Azambre et al, 1992;Rossy et al, 1992). The age of the Cretaceous magmatism is often constrained by stratigraphic correlations with the sedimentary formations in which volcanic or intrusive rocks are observed (Fig.…”

Section: Magmatismmentioning

confidence: 99%

High-temperature metamorphism during extreme thinning of the continental crust: a reappraisal of the North Pyrenean passive paleomargin

et al. 2015

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Abstract. An increasing number of field examples in mountain belts show that the formation of passive margins during extreme continent thinning may occur under conditions of high to very high thermal gradient beneath a thin cover of syn-rift sediments. Orogenic belts resulting from the tectonic inversion of distal margins and regions of exhumed continental mantle may exhibit high-temperature, low-pressure (HT-LP) metamorphism and coeval syn-extensional, ductile deformation. Recent studies have shown that the northern flank of the Pyrenean belt, especially the North Pyrenean Zone, is one of the best examples of such inverted hot, passive margin. In this study, we provide a map of HT-LP metamorphism based on a data set of more than 100 peak-temperature estimates obtained using Raman spectroscopy of the carbonaceous material (RSCM). This data set is completed by previous PT (pressure and temperature) estimates based on mineral assemblages, and new 40 Ar-39 Ar (amphibole, micas) and U-Pb (titanite) ages from metamorphic and magmatic rocks of the North Pyrenean Zone. The implications on the geological evolution of the Cretaceous Pyrenean paleomargins are discussed. Ages range mainly from 110 to 90 Ma, and no westward or eastward propagation of the metamorphism and magmatism can be clearly identified. In contrast, the new data reveal a progressive propagation of the thermal anomaly from the base to the surface of the continental crust. Focusing on the key localities of the Mauléon basin, Arguenos-Moncaup, Lherz, Boucheville and the Bas-Agly, we analyze the thermal conditions prevailing during the Cretaceous crustal thinning. The results are synthetized into a series of three regional thematic maps and into two detailed maps of the Arguenos-Moncaup and Lherz areas. The results indicate a first-order control of the thermal gradient by the intensity of crustal thinning. The highest grades of metamorphism are intimately associated with the areas where subcontinental mantle rocks have been unroofed or exhumed.

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“…Filled symbols represent data from : Smulikowski 1929;Mahmood 1973;Kudlásková 1987;Dostal & Owen 1998;Włodyka 2010 (Harangi & Árva-Sós 1993). Mesozoic teschenites are rare elsewhere although occurences have been documented in Georgia (Lebedev et al 2009), the French Pyrenees (Azambre et al 1992;Storetvedt et al 1999) and Russia (Transbaikalia - Metelkin et al 2004;Stupak et al 2004) where volcanic activity associated with teschenite emplacement occured during the Late Cretaceous (from 86 to 110 Ma).…”

Section: Figmentioning

confidence: 99%

LA-ICP-MS U-Pb apatite dating of Lower Cretaceous rocks from teschenite-picrite association in the Silesian Unit (southern Poland)

Szopa¹,

Włodyka²,

Chew³

2014

Geologica Carpathica

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Abstract:The main products of volcanic activity in the teschenite-picrite association (TPA) are shallow, sub-volcanic intrusions, which predominate over extrusive volcanic rocks. They comprise a wide range of intrusive rocks which fall into two main groups: alkaline (teschenite, picrite, syenite, lamprophyre) and subalkaline (dolerite). Previous 40 Ar/ 39 Ar and 40 K/ 40 Ar dating of these rocks in the Polish Outer Western Carpathians, performed on kaersutite, sub-silicic diopside, phlogopite/biotite as well as on whole rock samples has yielded Early Cretaceous ages. Fluorapatite crystals were dated by the U-Pb LA-ICP-MS method to obtain the age of selected magmatic rocks (teschenite, lamprophyre) from the Cieszyn igneous province. Apatite-bearing samples from Boguszowice, Puńców and Lipowa yield U-Pb ages of 103± 20 Ma, 119.6 ± 3.2 Ma and 126.5 ± 8.8 Ma, respectively. The weighted average age for all three samples is 117.8 ± 7.3 Ma (MSWD =2.7). The considerably smaller dispersion in the apatite ages compared to the published amphibole and biotite ages is probably caused by the U-Pb system in apatite being less susceptible to the effects of hydrothermal alternation than the 40 Ar/ 39 Ar or 40 K/ 40 Ar system in amphibole and/or biotite. Available data suggest that volcanic activity in the Silesian Basin took place from 128 to 103 Ma with the the main magmatic phase constrained to 128-120 Ma.

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Petrology of the alkaline magmatism from the Cretaceous North-Pyrenean Rift Zone (France and Spain)

Cited by 40 publications

References 0 publications

Petrogenetic significance of ocellar camptonite dykes in the Ditrău Alkaline Massif, Romania

Petrogenetic significance of ocellar camptonite dykes in the Ditrău Alkaline Massif, Romania

High-temperature metamorphism during extreme thinning of the continental crust: a reappraisal of the North Pyrenean passive paleomargin

LA-ICP-MS U-Pb apatite dating of Lower Cretaceous rocks from teschenite-picrite association in the Silesian Unit (southern Poland)

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