About this book
Petrologists regard enclaves (mafic inclusions, xenoliths,...) as essential for understanding the genesis and evolution of igneous rocks, in particular, the petrology of granitoids. This volume is a collection of forty papers which represent an up to date inventory and an open discussion of the main concepts proposed for the origin and evolution of enclaves in igneous rocks. The contributors are from Australia, China, Japan, USA, USSR and Europe. In the first part of the volume, various types of enclaves are investigated in granitoids of different natures and ages, emplaced in contrasted tectonic environments. Some of these granitoids are from reference areas such as the Lachlan Fold Belt, Australia, the Massif Central, France, and the Sierra Nevada, California. Enclaves from volcanic rocks of Japan and France are also included. The second part begins with a discussion of the macroscopic and microscopic features, textures, mineralogy and chemistry (major, trace elements and isotopes) of enclaves and the host granitoids. Various and often contrasting models including the restite model are then proposed for the genesis and evolution of enclaves and the host granitoids. The favored magma mixing model is detailed through the full set of petrologic tools including laboratory experiments. The extensive bibliography included refers to most papers published on enclaves in the last twenty years.
Contents
Introduction Granites in the Main Plutonic Series (J. Lameyre, B. Bonin). The Different Types of Enclaves in Granites - Nomenclature (J. Didier, B. Barbarin). The Outstanding Contribution of Alfred Lacroix to the Study of Enclaves in Magmatic Rocks (J. Didier, R.C. Maury). Case Studies of Enclaves in Magmatic Rocks Throughout the World. Enclaves of the Miocene Himalayan Leucogranites (P. Le Fort). The Various Types of Enclaves in the Hercynian Granitoids of the Massif Central - France (J. Didier). Vaugnerites - Special Lamprophyre-Derived Mafic Enclaves in Some Hercynian Granites from Western and Central Europe (H. Sabatier). Enclaves in the Hercynian Granitoids of the Urals Mountains - U.S.S.R. (G.B. Fershtater, N.S. Borodina). A Two-Stage Crust-Mantle Interaction Model for Mafic Microgranular Enclaves in the Daning Granodiorite Pluton - Guangxi, China (Sha Liankun, Yuan Kuirong). Mafic Enclaves of Some I-type Granites of the Palaeozoic Lachlan Fold Belt, Southeastern Australia (Y. Chen, B.W. Chappell, A.J.R. White). Microdioritic Enclaves Within the Scottish Caledonian Granitoids and Their Significance for Crustal Magmatism (W.S. Stephens, P. Holden, P.J. Henney). Enclaves of the Mesozoic Calc-Alkaline Granitoids of the Sierra Nevada Batholith - California (B. Barbarin). Enclaves in the Mesozoic and Cenozoic Granitoids of the Peruvian Coastal Batholith (M.A. Bussell). Enclaves of the Late Miocene Monte Capanne Granite, Elba Island, Italy (F. Bussy).The Enclaves of the Alkaline Anorogenic Granites: An Overview (B. Bonin). Enclaves and Mafic-Felsic Associations in the Permian Alkaline Province of Corsica, France: Physical and Chemical Interactions Between Coeval Magmas (B. Platevoet, B. Bonin). Enclaves in Plagiogranites of the Guevgueli Ophiolitic Complex, Macedonia, Greece (J. Bebien). Comagmatic Enclaves in Lavas from the Mont-Dore Composite Volcano, Massif Central, France (A. Gourgaud). Enclaves in Volcanic Rocks from Japan (T. Koyaguchi). Main Features of Mafic Microgranular Enclaves. Macroscopic Features of Mafic Microgranular Enclaves (B. Barbarin, J. Didier). Relative Rheology of Coeval Mafic and Felsic Magmas: Nature of Resulting Interaction Processes. Shape and Mineral Fabrics of Mafic Microgranular Enclaves (A.N. Fernandez, B. Barbarin). Interpretation of Microstructures of Microgranitoid Enclaves (R.H. Vernon). Comparative Major Element Chemistry in Various Microgranular Enclave - Plutonic Host Pairs (F. Debon). Trace Element Behaviour in Microgranular Enclaves from Granitic Rocks (A.G. Tindle). Sr-Nd Isotopic Study of Igneous and Metasedimentary Enclaves in Some Hercynian Granitoids from the Massif Central, France (C. Pin). Sr-Nd-O Isotopic Features of Mafic Microgranular Enclaves and Host Granitoids from the Pyrenees, France: Evidence for their Hybrid Nature and Inference on their Origin (S. Fourcade, M. Javoy). Genesis and Evolution of Mafic Microgranular Enclaves.
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