Geochemistry and Pb-207/Pb-206 zircon ages of granitoids from the southern portion of the Tamboril-Santa Quiteria granitic-migmatitic complex, Ceara Central Domain, Borborema Province (NE Brazil)

The Tamboril-Santa Quiteria Complex is an important Neoproterozoic granitic-migmatitic unit from the Ceara Central Domain that developed from ca. 650 to 610 Ma. In general the granitoids range in composition from diorite to granite with predominance (up to 85%) of granitic to monzogranitic composition with biotite as the main mafic AFM phase. Geochemical and Pb-207/Pb-206 evaporation zircon geochronology studies were applied in a group of these abundant monzogranitic rocks from the region of Novo Oriente in the southern portion of the Ceara Central Domain. In this area the granitoids are weakly peraluminous biotite granitoids and deformed biotite granitoids of high-K calc-alkaline and ferroan composition, which we interpreted as primary magmas (segregated diatexites) derived from the partial melting of crustal material. The close temporal relation of this magmatism with local eclogitic and regional high temperature metamorphism in Ceara Central Domain point out to an orogenic setting, arguably emplaced during the collisional stage. Subordinate coeval juvenile mantle incursions are also present. This crustally derived magmatism is the primary product of the continental thickening that resulted from the collision between the rocks represented by the Amazonian-West African craton (Sao Luiz cratonic fragment) to the northwest and the Paleoproterozoic-Archean basement of the Borborema Province to the southeast along the Transbrasiliano tectonic corridor. (C) 2011 Elsevier Ltd. All rights reserved.

Na 1 Nachlass Max Horkheimer, 2 - Korrespondenzen u.a. an Raymond Aron (p. I 1, 206-333)

16 Briefe zwischen Ruth Nanda Anshen und Max Horkheimer, 1938-1941; 5 Briefe zwischen Peter Appel und Max Horkheimer, 1937; 1 Drucksache der Arbeitsgemeinschaft Sozialistischer Ärzte in Hessen, Juli 1949; 1 Brief der Arbeitsgemeinschaft für Soziale Betriebsgestaltung in Heidelberg an Max Horkheimer, 18.10.1949; 2 Briefe zwischen Lois Archer und Max Horkheimer, 24.07.1947, 04.08.1947; 2 Briefe zwischen Camille Arnaud und Max Horkheimer, 03.03.1946, 22.03.1946; 39 Briefe zwischen Raymond Aron und Max Horkheimer, 1935-1938; 2 Briefe zwischen Ruth Arrau und Max Horkheimer, 28.06.1949, 10.10.1949; 3 Briefe zwischen S. Aufhauser und Max Horkheimer, 1939-1941, 16.04.1941; 8 Briefe zwischen der Zeitschrift 'Aufbau' und Max Horkheimer, 1944-1944; 3 Briefe zwischen der Automobile Club of New York und Max Horkheimer, 1937, 10.08.1937;

Na 50 Nachlass Arthur Schopenhauer - 'Schopenhauer-Archiv', 206 - Danksagung wegen des positiven Urteils über die herausgegebenen Kantschen Werke

u.a.: Studienreise; Bearbeitung des Nachlasses von Immanuel Kant; Bellavesne;

Na 1 Nachlass Max Horkheimer, 446 - Korrespondenzen mit der UNESCO (p. V 168, 145-206)

Drucksachen und Schriftwechsel der UNESCO (Paris, Hamburg, Gauting), 1957-1965; 69 Briefe zwischen Dr. Gilda Mara, UNESCO und Max Horkheimer, 1959-1965; 12 Briefe zwischen Dr. Helga Timm, UNESCO und Max Horkheimer, 1957-1958;

Na 1 Nachlass Max Horkheimer, 539 - Korrespondenzen mit Leo Löwenthal und Friedrich Pollock (p. VI 15, 1 - 206)

113 Briefe zwischen Max Horkheimer und Leo Löwenthal; 1 Brief von Leo Löwenthal an Moritz Horkheimer, 25.08.1942; 1 Brief von Leo Löwenthal an Alfredo Mendizabel, 19.08.1942; 1 Brief von Eileen A. Fry an Max Horkheimer, 19.08.1942; 4 Briefe zwischen Leo Löwenthal und Frederick Pollock, 1942; 1 Brief von Max Horkheimer an Frederick Pollock, 11.12.1942;

Ms.Ff.F.Stoltze 3. 206 - Brief von Karl Gustav Odermann an Friedrich Stoltze

Stoltze: Gedicht in den Berichten des Freien Deutschen Hochstifts (1880, S. 395), Bitte um Abschrift des Stoltze-Gedichts zu Friedrich Schillers 100. Geburtstag

Na 1 Nachlass Max Horkheimer, 553 - Korrespondenzen mit Leo Löwenthal (p. VI 22, 1-206)

126 Briefe zwischen Max Horkheimer und Leo Löwenthal, Januar - August 1948; 1 Brief von J. D. Scott an Max Horkheimer, 28.04.1948; 1 Telegramm von Fred May an Leo Löwenthal, 22.04.1948; 2 Briefe zwischen David Riesmann und Leo Löwenthal, Februar - März 1948; 1 Brief von Max Horkheimer an Herbert Macuse, 1948; 1 Brief von Leo Löwenthal an William Dieterle, 27.02.1948; 2 Briefe zwischen Theodor W. Adorno und Leo Löwenthal, 1948; 1 Brief von Max Horkheimer an Samuel H. Flowerman, 20.02.1948; 1 Brief von Irving Howe an Leo Löwenthal, 02.09.1948; 3 Briefe zwischen Erich Preiser und Leo Löwental, 1948; 1 Brief von Walter Hallstein an Max Horkheimer, 02.07.1948; 1 Brief von Max Horkheimer an M. Fiske Lissance, 05.02.1948; 1 Brief und 1 Memorandum an John Slawson von Max Horkheimer, 10.01.1948;

Ausst. 206 - De vitanda vsvra ex Greco in Latinvm tradvctvs

Vorbesitzer: Heinrich Anton Cornill-d'Orville (Exlibris im Vorderdeckel)

Ms. lat. oct. 206 - Annotata ad Burkhardi Gotthelfi Struvii Bibliothecam iuris selectam

Vorbesitzer: Familie von Holzhausen;

In-situ Iron isotope measurements and mineral compositions from ODP Hole 206-1256D and IODP Hole 335-U1256D

In-situ Fe isotope measurements have been carried out to estimate the impact of the hydrothermal metamorphic overprint on the Fe isotopic composition of Fe-Ti-oxides and Fe-sulfides of the different lithologies of the drilled rocks from IODP Hole 1256D (eastern equatorial Pacific; 15 Ma crust formed at the East Pacific Rise). Most igneous rocks normally have a very restricted range in their 56Fe/54Fe ratio. In contrast, Fe isotope compositions of hot fluids (> 300 °C) from mid-ocean-ridge spreading centers define a narrow range that is shifted to lower delta 56Fe values by 0.2 per mil - 0.5 per mil as compared to igneous rocks. Therefore, it is expected that mineral phases that contain large amounts of Fe are especially affected by the interaction with a fluid that fractionates Fe isotopes during exsolution/precipitation of those minerals. We have used a femtosecond UV-Laser ablation system to determine mineral 56Fe/54Fe ratios of selected samples with a precision of < 0.1 per mil (2 sigma level) at micrometer-scale. We have found significant variations of the delta 56Fe (IRMM-014) values in the minerals between different samples as well as within samples and mineral grains. The overall observed scale of delta 56Fe (magnetite) in 1256D rocks ranges from - 0.12 to + 0.64 per mil, and of delta 56Fe (ilmenite) from - 0.77 to + 0.01 per mil. Pyrite in the lowermost sheeted dike section is clearly distinguishable from the other investigated lithological units, having positive delta 56Fe values between + 0.29 and + 0.56 per mil, whereas pyrite in the other samples has generally negative delta 56Fe values from - 1.10 to - 0.59 permil. One key observation is that the temperature dependent inter-mineral fractionations of Fe isotopes between magnetite and ilmenite are systematically shifted towards higher values when compared to theoretically expected values, while synthesized, well equilibrated magnetite-ilmenite pairs are compatible with the theoretical predictions. Theoretical considerations including beta-factors of different aqueous Fe-chlorides and Rayleigh-type fractionations in the presence of a hydrous, chlorine-bearing fluid can explain this observation. The disagreement between observed and theoretical equilibrium fractionation, the fact that magnetite, in contrast to ilmenite shows a slight downhole trend in the delta 56Fe values, and the observation of small scale heterogeneities within single mineral grains imply that a general re-equilibration of the magnetite-ilmenite pairs is overprinted by kinetic fractionation effects, caused by the interaction of magnetite/ilmenite with hydrothermal fluids penetrating the upper oceanic crust during cooling, or incomplete re-equilibration at low temperatures. Furthermore, the observation of significant small-scale variations in the 56Fe/54Fe ratios of single minerals in this study highlights the importance of high spatial-resolution-analyses of stable isotope ratios for further investigations.