Results 91 to 100 of about 297,462 (204)

Geology and geochronology of the Magdalena-Madera metamorphic core complex lower plate in the sierras Las Jarillas-El Potrero, northern Sonora

Revista Mexicana de Ciencias Geológicas
The area of sierras Las Jarillas-El Potrero in northern Sonora is interpreted as a portion of the lower plate of the Magdalena metamorphic core complex. Rock units that characterize this locality range in age from Jurassic to Eocene.
Teresita Sánchez Navarro, Michelle Vázquez Salazar, Carlos M. González-León, Luigi A. Solari, Anne E. Egger, Teresa Orozco-Esquivel, Margarita López-Martínez, Jonathan A. Nourse, Ofelia Pérez Arvizu, Rufino Lozano-Santacruz   +9 more
doaj   +1 more source

Geochronology, Nd isotopes and reconnaissance geochemistry of volcanic and metavolcanic rocks of the Sao Luis Craton, northern Brazil: Implications for tectonic setting and crustal evolution

, 2009
New field work, in addition to zircon geochronology, Nd isotopes and reconnaissance geochemical data allow the recognition of Paleoproterozoic volcanic and metavolcanic sequences in the São Luís Craton of northern Brazil.
BRITO, Reinaldo S. C., MOURA, Candido A. V., ARMSTRONG, Richard, LOBATO, Denise C., KLEIN, Evandro L., LUZARDO, Rene   +5 more
core  

The structure, stratigraphy and strain history of the Seine Group and related rocks near Mine Centre, Northwestern Ontario [PDF]

, 1982
One or possibly two overlapping periods of deformation are responsible for the structures observed in the rocks in the Seine River area. This deformation has resulted in the formation of tight to isoclinal, non-plane approximately cylindrical major F1
Jackson, Paul Anthony
core  

Petrogenetic and Tectonic Evolution of the Cariris Velhos Event in the Afogados da Ingazeira Region (PE), Alto Pajeú Terrane, Borborema Province [PDF]

Geologia USP. Série Científica, 2011
The Tonian Cariris Velhos event was studied in the area around Afogados da Ingazeira town, Pernambuco State,Northeast Brazil, which is situated within the Alto Pajeú terrane, a Tonian-Ediacaran composite domain of the BorboremaProvince. The exposed rocks
Alberto de Oliveira Sales, Edilton José dos Santos, Edmilson Santos de Lima, Lauro Cézar Montefalco de Lira Santos, Benjamim Bley de Brito Neves   +4 more
doaj  

Age and tectonic setting of Mesozoic metavolcanic and metasedimentary rocks, northern White Mountains, California

, 1987
Mesozoic metavolcanic and metasedimentary rocks in the northern White Mountains, eastern California and western Nevada, are separated from lower Paleozoic and Precambrian rocks by Jurassic and Cretaceous plutons. The large stratigraphic hiatus across the
Saleeby, Jason, Hanson, R. Brooks, Fates, D. Gilbert   +2 more
core  

Geological significance of deformed metavolcanic, metasedimentary, and plutonic rocks in the Composite Arc Belt, southwest Grenville Province, near Actinolite, Ontario

, 2004
Detailed lithological and structural mapping was carried out in an area north of Tweed, Ontario, Canada, along the domain boundary between the Mazinaw and Grimsthorpe (Elzevir) domains of the Composite Are Belt, Grenville Province. The area, known as the
Alexander, Sharyn Anne
core   +1 more source

Tectonic significance of mafic volcanic rocks in a Mesozoic sequence of the Menderes Massif, West Turkey

, 2002
The Mesozoic platform sequence of the Menderes Massif consists of thick succession of detrital and carbonate rocks. In this sequence there are mafic metavolcanic rocks at two different levels.
Erdogan, B, GÜNGÖR, TALİP
core   +1 more source

Sr–Nd isotopic compositions of Paleoproterozoic metavolcanic rocks from the southern Ashanti volcanic belt, Ghana

Neodymium (Nd) and strontium (Sr) isotopic data are presented for Paleoproterozoic metavolcanic rocks in the southern part of the Ashanti volcanic belt of Ghana. The metavolcanic rocks are predominantly basalts/basaltic andesites and andesites with minor
Dampare, Samuel, Manu, Johnson, Okano, Osamu, Asiedu, Daniel, Shibata, Tsugio, Sakyi, Patrick   +5 more
core  

Geology of a Sulfide Deposit in Lower Precambrian Metavolcanic-Metasedimentary Rocks near Birchdale, Koochiching County, Minnesota

, 1974
A Thesis submitted to the faculty of the Graduate School of the University of Minnesota by William Harold Listerud in partial fulfillment of the requirements for the degree of Master of Science, February 1974.
Listerud, William Harold
core  

Geochemistry of the felsic metavolcanic rocks of the Wakeham Group: a metamorphosed peralkaline suite from the eastern Grenville Province, Quebec, Canada

, 1986
The Wakeham Group is a suite of low-grade (greenschist facies) rocks located in the eastern Grenville Province. In order of volumetric importance, it consists of sandstones, acid volcanics, and gabbro dykes and sills.
James H. Bourne
core   +1 more source