Metamorphic chlorite and “vermiculitic” phases in mafic dikes from the Maláguide Complex (Betic Cordillera, Spain)
TLDR
In this article, low-grade metamorphic mineral associations present in mafic dikes from the Malaguide Complex were examined by X-ray diffraction (XRD) analysis, electron microprobe analysis (EMPA) and transmission-analytical electron microscopy (TEM/AEM).Abstract:
Low-grade metamorphic mineral associations present in mafic dikes from the Malaguide Complex were examined by X-ray diffraction (XRD) analysis, electron microprobe analysis (EMPA) and transmission-analytical electron microscopy (TEM/AEM). The low-grade phyllosilicates occur both as pseudomorphs after pyroxene and as matrix phases of the rock. The metamorphic phyllosilicate assemblage is formed either by chlorite + muscovite or by the association chlorite + randomly ordered chlorite/vermiculite mixed-layers + 1:1 regular chlorite/vermiculite mixed-layers + vermiculite (or Na-biotite). Chemical changes observed from chlorite to vermiculitic phases include: 1) increase of the Si/Al ratio; 2) decrease of Mg+Fe; and 3) presence of variable amounts of Ca+alkali. Later alteration of the second assemblage originates Al-smectite, which forms from chlorite-, mixed-layers- and low-charge biotite (vermiculite) packets. Excluding the alteration products, the mineral associations observed in dikes are similar, as studied by XRD, to those observed in metaclastites from this Complex, suggesting a common metamorphic event. Nevertheless, both EMPA and TEM/AEM analyses reveal chemical differences, which are probably related to differences in bulk-chemistry between metaclastites and dikes.read more
Citations
More filters
Journal ArticleDOI
Variscan Tectonics in the Malaguide Complex (Betic Cordillera, Southern Spain): Stratigraphic and Structural Alpine versus Pre‐Alpine Constraints from the Ardales Area (Province of Malaga). I. Stratigraphy
Agustín Martín-Algarra,Stefano Mazzoli,Vincenzo Perrone,Rosario Rodríguez-Cañero,Pilar Navas-Parejo +4 more
TL;DR: In the Betic Cordillera, the pre-Alpine deformation in the Paleozoic basements is rather poorly known as mentioned in this paper, and the conodont color alteration index shows average values around 5.5.
Journal ArticleDOI
Chemical and structural evolution of "metamorphic vermiculite" in metaclastic rocks of the betic cordillera, málaga, spain: a synthesis
TL;DR: In this paper, les mineraux de type vermiculite provenant d'une sequence metamorphique des Cordilleres Betiques pres de Mâlaga, dans le sud-est de l'Espagne, au moyen de diffraction X, d'un microsonde electronique, and par microscopie electronique par transmission avec capacite analytique.
Book ChapterDOI
Alpine Metamorphism in the Betic Internal Zones
María Teresa Gómez-Pugnaire,Fernando Nieto,Isabel Abad,Nicolás Velilla,Carlos J. Garrido,Antonio Acosta-Vigil,Amel Barich,Károly Hidas,Vicente López Sánchez-Vizcaíno +8 more
TL;DR: In this paper, the age of the HP metamorphism, ranging between 17.3 ± 0.4 and 15.6 Ma, is more recent than in the Alpujarride Complex and took place during subduction of the Nevado-Filabride Complex beneath the Alboran Domain terranes.
Journal ArticleDOI
The lower-pressure stability of glaucophane in the presence of paragonite and quartz in the system Na2O-MgO-Al2O3-SiO2-H2O
TL;DR: In this paper, the transition of the blueschist to greenschist facies has been modeled by the reaction glaucophane (Gln) + paragonite (Pg) + water (V) = clinochlore (Chl) + albite (Ab) + quartz (Qtz).
Journal ArticleDOI
Two stages of Metamorphic vermiculite growth in schists from the Maláguide Complex, Betic Cordillera, Spain
TL;DR: In this article, two types of "vermiculite metamorphique", distincts dans leur developpement textural, ont ete identified au Cours d'une etude d'echantillons de schistes paleozoiques provenant des parties profondes du complexe de Malaguide, Cordillere Betique, in Espagne, France.
References
More filters
Journal ArticleDOI
Cation Site occupancy in chlorites and illites as a function of temperature
TL;DR: The relationship between the composition and the crystallization temperature of chlorites and illites has been investigated in different geothermal fields and in particular the Los Azufres system in Mexico, considered to be a natural analogue to experimental laboratories.
Journal ArticleDOI
Systematics of chlorite alteration at the Phelps Dodge massive sulfide deposit, Matagami, Quebec
P. Kranidiotis,W. H. MacLean +1 more
TL;DR: Chlorites in the Si-Al-Mg-Fe system form a rectangular solid solution plane with limited substitution of Al for Si and extensive substitution of Fe for Mg.
Journal ArticleDOI
Chlorite geothermometry; a review
TL;DR: In this article, a comparative analysis of chlorite geothermometers is presented, showing that no single chlorite analysis performs satisfactorily over the whole range of natural conditions (different temperatures, coexisting assemblages, Fe/(Fe + Mg), fO2, etc.).
Journal ArticleDOI
Clay mineral thermometry : a critical perspective
Eric J. Essene,Donald R. Peacor +1 more
TL;DR: In this article, it was shown that the solubility experiments on the stabilities of clay minerals are unlikely to attain equilibrium at low temperatures and that the activity of soluble species may be controlled by surface equilibria, or by absorbed or exchangeable cations.
Journal ArticleDOI
Kinetics of muscovite, phlogopite, and biotite dissolution and alteration at pH 1-4, room temperature
TL;DR: In this article, the reaction kinetics of dioctahedral muscovite and trio-chedral phlogopite and biotite were studied in aqueous solutions at pH 1-4 and room temperature.
Related Papers (5)
Integrated TEM, XRD and electron microprobe investigation of mixed-layer chlorite–smectite from the Point Sal ophiolite, California
The characterization of mafic phyllosilicates in low-grade metabasalts from eastern North Greenland
Transmission electron microscopic study of diagenetic chlorite in Gulf Coast argillaceous sediments
Jung Ho Ahn,Donald R. Peacor +1 more