History_ _ ____________________________________ Fieldwork and maps.___________________________ General geology of the Quadrilatero Ferrifero___________ Topography and physiography ___________________ Stratigraphy_ __________________________________ Structure._____________________________________ Metamorphism and the granitic-gneiss problem_____ Other igneous rocks_____________________________ Geology of the Itabira district__-___-_________________ Stratigraphy. __________________________________ Rio das Velhas series._______________________ Lithology__ _ ___________________________ Schists____________________________ Quartzite and meta-arkose(?)_________ Dolomitic schist ____________________ Other rocks________________________ Thickness and contacts..________________ Minas series ________________________________ Cara §a group __________________________ Lithology_ _________________________ Distribution, thickness, and contacts __ Itabira group Caue itabirite_ ___________ Lithology_ _________________________ Distribution, thickness, and contacts--Origin of itabirite___________________ Original composition________________ Sedimentary environment__________ Relations to volcanism______________ Disaggregated itabirite______________ Piracicaba group______________________ Lithology__ _ _______________________ Distribution, thickness, and contacts__ Talc veinlets_______________________ Tertiary and Quaternary deposits,.___________ Igneous and gneissic rocks _______________________ Altered ultramafic and mafic rocks____________ Soapstone and serpentinite_______________ Amphibolit e_ ___________________________ Other amphibolitic rocks_______________ Granitic gneiss.____________________________ Lithology._____________________________ Distribution_ _ _ _______________________ Contacts and age relations.___--________-Borrachudos granite_______________________ Lithology._____________________________ Age relations.__________________________ Dikes_ ____________________________________ Metamorphosed mafic dikes___-________--Pegmatites_ _ _________________________ Postmetamorphic mafic dikes___________ Quartz veins_______________________________ Structure._____________________________________ Folds in the Minas series.___________________ Linear structure and depth of synclines____--_-Origin of crenulations in iron-formation______
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.