CONTRIBUTIONS TO THE 6th INTERNATIONAL SYMPOSIUM ON GRANITIC PEGMATITES EDITORS WILLIAM B. SIMMONS KAREN L. WEBBER ALEXANDER U. FALSTER ENCARNACIÓN RODA-ROBLES SARAH L. HANSON MARÍA FLORENCIA MÁRQUEZ-ZAVALÍA MIGUEL ÁNGEL Galliski GUEST EDITORS ANDREW P. BOUDREAUX KIMBERLY T. CLARK MYLES M. FELCH KAREN L. MARCHAL LEAH R. GRASSI JON GUIDRY SUSANNA T. KREINIK C. MARK JOHNSON COVER DESIGN BY RAYMOND A. SPRAGUE PRINTED BY RUBELLITE PRESS, NEW ORLEANS, LA PEG 2013: The 6th International Symposium on Granitic Pegmatites PREFACE Phosphate Theme Session Dedicated to: François Fontan, André-Mathieu Fransolet and Paul Keller, It is a pleasure for the organizing committee to phosphates during the evolution of the pegmatites introduce the special session on phosphates, as an and on their relationship to other mineral phases, important part of the program of the 6th such as silicates. These kinds of studies are getting International Symposium on Granitic Pegmatites. more and more abundant, with some interesting The complexity of phosphate associations, examples in this volume. commonly occurring as a mixture of several fine- We take this opportunity to honor François grained phases, make their study difficult. However Fontan, Paul Keller and André-Mathieu Fransolet. over the last decades, the number of publications on These three exceptional researchers have pegmatite phosphate minerals has increased contributed enormously to the advancement in the exponentially as a result of new techniques. The knowledge on phosphates during the last decades. early investigations focused on description, They worked individually and jointly, always in an composition and paragenesis. Now that most of the enthusiastic, effective and tireless way. They passed phases have been extensively described and their knowledge and interest in phosphates onto replacement sequences of secondary phosphates are many younger researchers. Now we would like to better understood, we are at the beginning of a new thank them sincerely for all their work. frontier of investigations of the petrogenetic role of François Fontan was born in Toulouse (France) in 1942, and he passed away six years ago, in July 2007, at the age of 64. François spent his career in research with the CNRS, at the Université Paul-Sabatier in Toulouse (France). He obtained his Doctorat d’Etat in 1971, under the guidance of François Permingeat, a founder of the International Mineralogical Association. He was particularly involved in investigations of the mineralogy and genesis of phosphate minerals in granitic pegmatites. With other specialists, he worked on the characterization of complex assemblages of phosphates in pegmatites in several European and African countries. Among his list of more than one hundred articles are descriptions of eight new mineral species. Fontanite, (Ca[(UO2)3(CO3)2O2]•6(H2O)) was named in recognition of his accomplishments. PREFACE Page ii PEG 2013: The 6th International Symposium on Granitic Pegmatites André-Mathieu Fransolet was born in Heusy (Belgium) in May of 1947. He finished his studies in Geology at the Université de Liège in October of 1969. In 1975 he defended his PhD Thesis on Geological and Mineralogical Sciences, at the same university, where he also developed most of his fruitful research, until he retired last year. During that time he published more than one hundred papers, most of them on phosphates associated with pegmatites all over the world and he contributed to the discovery of ten new mineral species. There are two mineral phases named after him: Fransoletite (H2Ca3Be2(PO4)4•4(H2O)) and parafransoletite (Ca3Be2(PO4)2(PO3,OH)2•4(H2O)) Paul Keller was born in Sarata, Romania in 1940. He finished his studies in Crystal Chemistry of Phosphates and Arsenates at The University of Stuttgart (Germany), in 1973. He worked for many years at the Institut für Mineralogie und Kristallchemie, at the University of Stuttgart (Germany), where he retired in 2006. His research on phosphates was very broad, with the publication of more than one hundred scientific papers, including the discovery of close to a dozen new mineral species. The phosphate paulkellerite (Bi2Fe(PO4)O2(OH)2) was named after him, in recognition of his productive career. (photograph courtesy of Anthony Kampf). PREFACE Page iii PEG 2013: The 6th International Symposium on Granitic Pegmatites TABLE OF CONTENTS KEYNOTE SPEAKERS Crystal Chemistry and Geothermometric Applications of Primary Pegmatite Phosphates F. HATERT ........................................................................................................................................................................................... 1 Reading Pegmatites: What Minerals Say D. LONDON ........................................................................................................................................................................................... 5 The Late-Stage Mini-Flood of Ca in Granitic Pegmatites: A Working Hypothesis R. MARTIN ............................................................................................................................................................................................ 7 Productive “Zones” in Gem-Bearing Pegmatites of Central Madagascar, Geochemical Evolution and Genetic Inferences F. PEZZOTTA ........................................................................................................................................................................................ 9 CONTRIBUTIONS Pegmatitic Rocks in a Migmatite-Granite Complex (NW Portugal) M. AREIAS, M. RIBEIRO, A. DÓRIA ....................................................................................................................................................... 12 Unraveling the Fluid Evolution of Mineralized Pegmatites in Namibia L. ASHWORTH, J. KINNAIRD, P. NEX .................................................................................................................................................... 14 The Phosphate Minerals Assemblages from Jocão Pegmatite, Minas Gerais, Brazil M. BAIJOT, F. HATERT, S. PHILIPPO ..................................................................................................................................................... 16 Preliminary Crystallography and Spectroscopy Data of Euclase from Northeast of Brazil S. BARRETO, DE B., V. ZEBEC, A ČOBIĆ, R.WEGNER, R BRANDÃO, P. GUZZO, L. SANTOS, V. BEGIĆ, V. BERMANEC ............................. 18 Two Generations of Microcline from Mount Malosa Pegmatite, Zomba District, Malawi V. BERMANEC, M. HORVAT, Ž. ŽIGOVEČKI GOBAC, V. ZEBEC ............................................................................................................... 20 Chrysoberyl in Association with Sillimanite at Roncadeira in the Borborema Pegmatite Province, Northeastern Brazil: Petrogenetic and Gemological Implications H. BEURLEN, D. RHEDE, R. THOMAS, D. SOARES, M. DA SILVA ............................................................................................................ 22 Cartography to Chemistry: Estimating the Bulk Composition of the Mt Mica Pegmatite via Map Analysis, Maine, USA A. BOUDREAUX, L. GRASSI, W. SIMMONS, A. FALSTER, K. WEBBER, G. FREEMAN ................................................................................ 24 Accessory Mineralogy of an Evolved Pegmatite, Dickinson County, Michigan T. BUCHHOLZ, A. FALSTER , W. SIMMONS ............................................................................................................................................ 26 The Ponte Segade Deposit (Galicia, NW Spain): A Recently Discovered Occurrence of Rare-Element Pegmatites F. CANOSA, M. FUERTES-FUENTE, A. MARTIN-IZARD ........................................................................................................................... 28 Contact Zone Mineralogy and Geochemistry of Mount Mica Pegmatite, Oxford Co., Maine, USA K. CLARK, W. SIMMONS, K. WEBBER, A. FALSTER, E. RODA-ROBLES, G. FREEMAN.............................................................................. 30 Preliminary 57Fe Mössbauer Spectroscopy Study of Metamict Allanite-(Ce) from Granitic Pegmatite, Fone, Aust-Agder, Norway A.ČOBIĆ, C.MCCAMMON, N.TOMAŠIĆ, V.BERMANEC ........................................................................................................................... 32 2+ 2+ Crystal Chemistry of M Be2P2O8 (M = Ca, Sr, Pb, Ba) Beryllophosphates: A Comparison with Feldspar Analogues F. DAL BO, F. HATERT, C. RAO ........................................................................................................................................................... 34 Spatial Statistical Analysis Applied to Rare-Elements LCT-Type Pegmatite Fields: An Original Approach to Constrain Faults-Pegmatites-Granites Relationships S. DEVEAUD, C. GUMIAUX , E. GLOAGUEN, Y. BRANQUET .................................................................................................................... 36 Be and Zn Behavior During Anatetic Formation of Early Pegmatoid Melts in Variscan Terrains – An Example from the Arga Pegmatite Field, Northern Portugal P. DIAS, C. LEAL GOMES ..................................................................................................................................................................... 37 Structural and Paragenetic Analysis of Swarms of Bubble Like Pegmatites in a Miarolitic Granite from Assunção South – Viseu – Central Portugal P. A. DIAS, P. ARAÚJO, M. PEREIRA,