On the Crystallization Conditions of the Neoproterozoic, High-K Calc
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The San Bias Pluton: an Example of Carboniferous Plutonism in the Sierras Pampeanas, Argentina
The San BIas Pluton: An example of Carboniferous plutonism in the Sierras Pampeanas, Argentina l.A. Dahlquist a.*, R.l. Pankhurst b, c.w. Rapela e, C. Casquet d, C.M. Fanning e, P. Alasino f, M. Baez g a UNdeC-CRlLAR-CONICET, Entre Ríos y Mendoza, 5301 Anillaco, La Rioja, Argentina b NERC lsotope Geosciences Laboratory, British Geological Survey, Keyworth, Nottingham, NG12 5GG, UK e Centro de Investigaciones Geológicas, Universidad Nacional de La Plata-CONICET, Calle / No. 644, /900 La Plata, Argentina d Universidad Complutense de Madrid, Facultad de Geología, Dpto. de Petrología y Geoquímica, 28040 Madrid, España e Research School of Earth Sciences, The Australian National University, Mills Road, Canberra, ACT 0200, Australia f CRlLAR-CONICET, Entre Ríos y Mendoza, 5301 Anillaco, La Rioja, Argentina g INSUGEO-UNT, Miguel Litio 205, 4000 S.M. de Tucumán, Argentina Abstraet New geoehronologieal and geoehemieal data are reported for the San BIas Pluton (SBP), in the northwestern Sierra de Velaseo, Sierras Pampeanas, whieh intrudes Ordovieian granitoids developed during the Famatinian orogeny. A precise Carboniferous age of 340 ± 3 Ma is established by U-Pb dating of zireon using a sensitive high-resolution ion mieroprobe (SHRIMP). The SBP illustrates several petrologieal and geoehemieal eharaeteristies of previously reported Carboniferous granitoids in the Sierras Pampeanas. Their generation is eonsistent with a regional reheating of the erust at approximately 342 Ma, whieh resulted in the forn1ation of relatively large amounts of granitie melts that were emplaeed in higher erustallevels along master fractures (older master shear zones ofLower Paleozoie age). The SBP can be ehemieally defined as a typieal A-type granitoid related to posteollisonal or postorogenie magmatism. -
Radiogenic Heat Production in Granitoids from the Sierras De Córdoba, Argentina
Pleitavino et al. Geotherm Energy (2021) 9:16 https://doi.org/10.1186/s40517-021-00198-9 RESEARCH Open Access Radiogenic heat production in granitoids from the Sierras de Córdoba, Argentina M. Pleitavino1,2* , M. E. Carro Pérez1,3,4 , E. García Aráoz1,4 and M. A. Cioccale1 *Correspondence: [email protected] Abstract 1 Facultad de Ciencias One of the most important processes of heat generation from the Earth’s interior is Exactas, Físicas y Naturales, Universidad Nacional de the radioactive decay of isotopes. The main hosts of the major radiogenic elements Córdoba, Av. Vélez Sarsfeld U, Th and K in the crust are granitoids. The Sierras de Córdoba are formed of dissimilar 1611, X5016CGA Córdoba, granitic intrusions emplaced by a series of magmatic events that occurred during Argentina Full list of author information the Paleozoic. The diferent granitoids are classifed as A-type, I-type, and S-type, and is available at the end of the there is also a magmatic expression corresponding to the Famatinian period which article exhibits TTG-type characteristics. In this work, the geochemical concentrations of the radiogenic elements of the granitic intrusions making up the Sierras de Córdoba were compiled in a single database. The radiogenic heat production of the Sierras de Córdoba granitoids was evaluated, making this the frst study of radiogenic heat gen- eration in the area. The radiogenic heat production showed variability for the diferent events, with the highest values found in Achalian magmatism and early Carboniferous magmatism, which are represented by A-type granitoids. The Capilla del Monte pluton has the highest heat production rate, with a value of 4.54 1.38 µW/m3. -
New Studies of Uranium Deposits Related to Granites in Argentina
NEW STUDIES OF URANIUM DEPOSITS RELATED TO GRANITES IN ARGENTINA J. ÁLVAREZ, L. LÓPEZ, F. PARRA, C. BELLO, P. ANZIL, M. SALVATORE, L. SCARLATTA, P. FERREYRA, S. MIYNO, E. FELKAI Comisión Nacional de Energía Atómica (CNEA), Buenos Aires, Argentina R. LIRA CONICET- FCEFyN-UNC, Córdoba, Argentina A. HANLY International Atomic Energy Agency, Vienna, Austria M. CUNEY, J. MERCADIER Université de Lorraine, Nancy, France 1. INTRODUCTION At present, the Comisión Nacional de Energía Atómica, in cooperation with the National University of Córdoba, is carrying out the project entitled Melallogenesis of Granite-Related Uranium Deposits in Argentina within the framework of an IAEA coordinated research project which is Geochemical and Mineralogical Characterization of Uranium and Thorium Deposits. This paper briefly describes the specific objectives and activities in progress as part of this research project, which has been underway since 2015 [1]. This project aims to focus on the characterization of the Devonian–Lower Carboniferous magmatic and hydrothermal systems related to granitoids of the Pampean Ranges and to relate these processes to uranium metallogeny. Therefore, several metallogenetic studies have been carried out in order to improve the geological, structural, geochemical and mineralogical characterization of uranium deposits related to granites. To this end, efforts have been made to define those felsic igneous rocks that have played the most relevant role as uranium sources, including successive fractionation in the different magmatic complexes and characterize the relationship between magmatic uranium enrichment and hydrothermal deposits, and alteration and uranium mobility. 2. DESCRIPTION AND RESULTS The scientific scope of this paper specifically covers four areas of uranium mineralization where granite- related (endogranitic) hosts have been described: Sala Grande, Don Alberto and Los Riojanos are enclosed in the Achala Batholith, and La Estela is located in the Cerro Áspero–Alpa Corral Batholith [2, 3]. -
Record Number
Supplementary material: Geochronological data used in the study NN Pegmatite field or belt Geochronology Used for dating Extrapola Most common References: 1,2 names/geological and (Ma) substances and tion classes of geochronology / pegmatite and regional geology descriptions administrative location source rocks3 number4 mineralized pegmatites in a region of the extrapolation5 1. Mpuluzi / Barberton GB6, 3113 ± 2.4 z, g(+) 2 RM Westraat et al., 2005; Kamo & Davis, 1994 / Maphalala & Kaapvaal craton, RSA & Trumbull, 1998 Swaziland 3105 ± 3 z+tt, g(+) 2. New Consort (Nelspruit) / 3106 +4/-3 z+tt, g (+) 1 RM Kamo & Davis, 1994 / Harris et al., 1995 Barberton GB, Kaapvaal craton, RSA 3. Sinceni / Ancient Gneiss 3074 ± 3 z, g (+); 2 RM Maphalala & Kröner, 1993; Trumbull, 1993 / Trumbull, 1995 Complex, Kaapvaal craton, 2990 ± 43 wr (Rb/Sr), g (+) Swaziland 4. Ivisaartoq / Ivisaartoq GB, 2963 ± 12 z, g (-) 2 RM Friend and Nutman, 2005/ Secher et al., 2008 Geenland craton, Greenland 5. Tabba Tabba, Pilgangoora, 2886 ± 21; c, p 6 RM Kinny, 2000 / Sweetapple & Collins, 2002 Hillside / Pilbara craton, 2879 ± 5; tn, p Australia 2877 ± 20 c, p 6. Wodgina, Strelley, Molyella / 2829 ± 11 tn, p 12 RM Kinny, 2000 / Sweetapple & Collins, 2002 Pilbara craton, Australia 2836 ± 26 c, p 2839 ± 16 c, p 7. Murchison / Murchison GB, 2848±58 z, p 2 RM Poujol & Robb, 1999; Poujol, M., 2001 / Boelema & Hira, 1998 Kaapvaal craton, RSA 2820±38 z, g (+) 8. Pakeagama Lake / North Spirit 2670±5 tn, p 2 RM Smith et al., 2004 / Breaks et al., 1999 1 Minerals used for geochronological -
Dissertation / Doctoral Thesis
DISSERTATION / DOCTORAL THESIS Titel der Dissertation /Title of the Doctoral Thesis „Rare metal granites, Central Eastern Desert, Egypt: geochemistry and economic potentiality“ verfasst von / submitted by Mabrouk Sami Mohamed Hassan, M.Sc. angestrebter akademischer Grad / in partial fulfilment of the requirements for the degree of Doktorin der Naturwissenschaften (Dr.rer.nat.) Wien, 2017 / Vienna, 2017 Studienkennzahl lt. Studienblatt / A 796 605 426 degree programme code as it appears on the student record sheet: Dissertationsgebiet lt. Studienblatt / Erdwissenschaften/ Earth sciences field of study as it appears on the student record sheet: Betreut von / Supervisor: Ao. Univ. Prof. Dr. Theodoros Ntaflos TABLE OF CONTENTS TABLE OF CONTENTS Acknowledgements I Abstract II Zusammenfassung IV CHAPTER I: INTRODUCTION General introduction 1 Literature reviews 2 Geological background 3 Objectives of this study 10 Methods 10 Isotopic systems 11 Synthesis 14 References 17 CHAPTER II 22 Sami, M., Ntaflos, T, Farahat, E. S., Mohamed, H. A., Ahmed, A. F., Hauzenberger, C., 2017. Mineralogical, geochemical and Sr-Nd isotopes characteristics of fluorite-bearing granites in the Northern Arabian-Nubian Shield, Egypt: Constraints on petrogenesis and evolution of their associated rare metal mineralization. Ore Geology Reviews 88, 1–22. CHAPTER III 51 Sami, M., Ntaflos, T, Farahat, E. S., Mohamed, H. A., Hauzenberger, C., Ahmed, A. F., 2017. Petrogenesis of Neoproterozoic highly fractionated garnet bearing muscovite granites in the Central Eastern Desert, Egypt: Evidence from LA-ICP-MS of garnet, whole-rock geochemistry and Sr-Nd isotopic systematics. (In Revision stage) CHAPTER IV 98 Sami, M., Ntaflos, T, Farahat, E. S., Mohamed, H. A., Ahmed, A. F., Hauzenberger, C., 2017. -
Raga 63.3.Qxp
380 Revista de la Asociación Geológica Argentina 63 (3): 380 - 394 (2008) LA SUSCEPTIBILIDAD MAGNÉTICA DEL BATOLITO DE ACHALA (DEVÓNICO, SIERRA GRANDE DE CÓRDOBA) Y SUS DIFERENCIAS CON OTROS GRANITOS ACHALIANOS Silvana E. GEUNA1, Leonardo D. ESCOSTEGUY2, Roberto MIRÓ2, Juan Carlos CANDIANI2 y María Fernanda GAIDO2 1 INGEODAV, Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires - CONI- CET. Email: [email protected] 2 IGRM - SEGEMAR RESUMEN El magmatismo devónico de las Sierras Pampeanas de Córdoba y San Luis está representado por batolitos y plutones de com- posición monzogranítica y forma subelíptica, emplazados en un basamento metamórfico-plutónico eopaleozoico. Se distin- guen dos grupos: el primero, compuesto por granitoides con hornblenda-biotita, metaluminosos a débilmente peraluminosos; y el segundo, formado por granitoides con biotita y muscovita, peraluminosos. Ambos grupos se caracterizan respectivamen- te por tener magnetita e ilmenita como fases accesorias, lo cual genera propiedades magnéticas distintivas. Entre ellos, el bato- lito de Achala, Córdoba, con una extensión de casi 2.500 km2, es un buen exponente de los granitos paramagnéticos (no mag- néticos). Su mineralogía magnética fue caracterizada en cuarenta y un sitios, la mayoría de ellos en el Monzogranito Achala. Se determinó una susceptibilidad magnética promedio muy baja, 15 x 10-5 (SI), controlada por el contenido de biotita e ilme- no-hematita. Veintiún sitios mostraron remanencia magnética estable portada por hematita, que aparece como un mineral accesorio, intercrecida con discos de exsolución de (hemo)ilmenita. La anisotropía de susceptibilidad magnética es débil y pre- dominan las formas obladas, como es usual en fábricas magmáticas de granitos paramagnéticos; casi no se obtuvieron linea- ciones. -
The Achala Batholith (Cordoba, Argentina) a Composite Intrusion Madeof Independant Magmatic Suites
Second ISAG, Oxford (UK),21 -231911 993 509 THE ACHALA BATHOLITH (CORDOBA, ARGENTINA) A COMPOSITE INTRUSION MADEOF INDEPENDANT MAGMATIC SUITES (1) Centre de GBologie GBnBraleet MiniBre, Ecole des Mines, 35 rue Saint-Honore, 77305 Fontainebleau, FRANCE (2) Comisi6n .Nacional de Energia Athica, Avenidad del Libertador, 1871 , Buenos Aires, ARGENTINA ABSTRACT : In the Sierra de Cordoba (Argentina), the Achala batholith consists in four independent peraluminous magmatic suites which shows contrasted major and trace elements spectra and variable metallogenic specialisation. KEY WORDS : Sierras pampeanas, S-type granites, diff erenciation, melallbgenic specialisation INTRODUCTION The Achala batholith which outcrops over a surface of about 2500 is km2, a major element of the Sierra Grande de Cordoba, the most oriental of the Pampean ranges. Several deposits and showings of W, Cu, U, F, Li, Be, Nb and Ta, are spacially associated with the batholith. The recent papers dealing with its petrology and geochemistry consideronly transversal cross-sections or limited sectors. The present study intends to take into account the whole batholith, since it is based on 84 reliable samples, carefuly selected out of the 450 available analyses, in order to to represent the different facies and the different sectorsof the intrusion. The Achala batholith is a post-tectonic intrusion emplaced in high grade rnetarnorphic rocks of the parnpean cycle (Upper Proterozoic).It is composite ; its main facies are synchronically emplaced in an environment of submeridian crustal shearing during alocal extensional stage.An horizontal shortening induces the formationof NW to NNW trending magmatic shear zones which host synkinematic intrusions. After its emplacement, the batholith was affected by large dextral wrench faults associated with mylonites, which are anteriorto the Upper Carboniferous, and by inverse faults related to the Andean cycle. -