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Rapakivi Granites and Related Rocks

  • Book

  • October 2023
  • Elsevier Science and Technology
  • ID: 5755509

Rapakivi Granites and Related Rocks tells the story of Rapakivi granites, a group of granitic rocks characterized by specific texture (presence of plagioclase-mantled ovoidal to subhedral alkali feldspar megacrysts, two generations of quartz and feldspars) and A-type geochemical composition. The book includes research and abundant geochemical and isotopic data combined with an understanding of geotectonic processes that allow more detailed tectonic and petrological modeling of rapakivi granite magmatism and associated ore mineralization. Well-known examples are found as anorogenic or post-orogenic batholith- to stock-sized intrusive complexes in the Precambrian cratons of Ukraine, Fennoscandia, South Greenland, Canada, United States, Brazil, Venezuela and Siberia.

The current knowledge of the rapakivi granites is largely based on the achievements of three International Geological Correlation Programme projects: IGCP-315 (Rapakivi Granites and Related Rocks) in in 1991-1996, IGCP-426 (Granite Systems and Proterozoic Lithospheric Processes) in 1998-2002, and IGCP-510 (A-type Granites and Related Rocks Through Time) in 2005-2009. After these projects, the research has continued actively utilizing enhanced geochemical methods, in situ geochemistry in particular.

Table of Contents

1. Historical Background and Definitions
2. Rapakivi Texture and Rapakivi Granite
3. State of the Art: Discussion on Various Aspects of Rapakivi Granite and Related Rocks
4. Intensive Parameters
5. Origin of Rapakivi Granite Magmas
6. Origin of Mantled Alkali Feldspar Megacrysts
7. Metallogeny
8. Granitoids Approaching Rapakivi Granites

Authors

Ilmari J Haapala Professor Emeritus, University of Helsinki, Finland. Ilmari Haapala received an MSc in geology and mineralogy in 1963, and PhD in 1966 at the University of Helsinki. He has worked as geologist, state geologist and acting head of the Exploration Department at the Geological Survey of Finland in 1966 -2001, and as professor of geology and mineralogy at University of Helsinki in 1982 -2002. Dr. Haapala has lead many Finnish and international research projects, including rapakivi granite projects in Finland, China, USA (New Mexico and Nevada) and Namibia. Organized eight international symposia. Edited several Finnish and English books on economic geology and granite petrology. Chairman of the Geological Society and Mineralogical Society of Finland. Member of the Finnish National Academy of Science and Letters since 1985.Fellow member of the Geological Society of America, the Mineralogical Society of Great Britain and Ireland, and the Geological Society of London. O.Tapani R�m� Professor, University of Helsinki, Finland. Tapani R�m� studied geology and mineralogy in the University of Helsinki. He worked as researcher, teaching assistant and acting lecturer and professor at the Department of Geology from 1985-2002 an was appointed to the post of professor of geology and mineralogy in 2003. R�m� has specialized in granite petrology and isotope geochemistry and has participated actively in several IGCP projects: secretary of Project 315 (Rapakivi Granites and Related Rocks) in 1991-96, co-leader of Project 426 (Granite Systems and Proterozoic Lithospheric Processes) in 1998-03, and co-leader of Project 510 (A-type Granites and Related Rocks through Time) in 2005-10. R�m� has led several Finnish and international research projects, organized numerous international symposia on granitic rocks, and edited several books and special issues dealing with granitic rocks. Roberto Dall'Agnol Professor, Institute of Federal University of Par�, Brazil. Roberto Dall'Agnol worked as geologist in the RADAM project during 1973-77 and completed his Doctor thesis at the Paul Sabatier University in Toulouse, France. He acted as professor of igneous petrology at the Geosciences Institute of Federal University of Par�, Brazil from 1980-2014. At present, he participates in the Graduate Program of Geology and Geochemistry of that institution and leads a research group in the Vale Institute of Technology in Bel�m, Par�, Brazil. Co-leader of the IGCP Project 510 (A-type Granites and Related Rocks trough Time) in 2005-10, IGCP Project 599 (Changing Early Earth) in 2011-14. Leader of the Project "Magmatism, crustal evolution and metallogenesis of the Caraj�s and adjacent provinces of the Amazonian craton� in 2000-06, and of other national geoscientific projects in Brazil until present. Guest editor of special volumes in Lithos, Journal of South American Earth Sciences, and Canadian Mineralogist