Results 81 to 90 of about 32,561 (204)

Isotope geochemistry and petrogenesis of peralkaline Middle Miocene ignimbrites from central Sonora: relationship with continental break-up and the birth of the Gulf of California [PDF]

, 2008
Middle Miocene peralkaline ignimbrites constitute a specific geodynamic marker of the early stage of opening of the Gulf of California, preserved either in central Sonora or the Puertecitos area, in Baja California.
Amortegui, Andrea, Bosch, Delphine, Brunet, Pierre, Demant, Alain, Lapierre, Henriette, Paz Moreno, Francisco A., Stock, Joann M., Vidal Solano, Jesús R.   +7 more
core   +3 more sources

The Mato Perso Conduit System: evidence of silicic magma transport in the southern portion of the Paraná-Etendeka LIP, Brazil

Brazilian Journal of Geology, 2018
: The Mato Perso Conduit System is described from a ~ 120 km2 area in south Brazil exposing silicic volcanics of the Paraná-Etendeka LIP. A volcanic succession is defined by basaltic flows covered by flat-lying oxidized vitrophyres, banded vitrophyres ...
Matheus Silva Simões, Evandro Fernandes de Lima, Carlos Augusto Sommer, Lucas de Magalhães May Rossetti   +3 more
doaj   +1 more source

An archean suture zone in the Tobacco Root Mountains? (1984) Evolution of Archean Continental Crust, SW Montana (1985) [PDF]

The Lake Plateau area of the Beartooth Mountains, Montana were mapped and geochemically sampled. The allochthonous nature of the Stillwater Complex was interpreted as a Cordilleran-style continental margin.
Kain, L., Mogk, D. W.
core   +1 more source

TWO PULSES OF MAGMATIC ACTIVITY DURING THE EARLY RIPHEAN KUONAMKA IGNEOUS PROVINCE FORMATION: PALEOMAGNETIC SUBSTANTIATION OF THE HYPOTHESIS

Геодинамика и тектонофизика
By the beginning of the 20th century, at least ten different generations of intrusive mafic bodies 1800–900 Ma were distinguished on the territory of the Anabar massif.
A. M. Pasenko, I. V. Fedyukin, V. E. Pavlov   +2 more
doaj   +1 more source

Density structure of the crust in the Emeishan large igneous province revealed by the Lijiang- Guiyang gravity profile

Earth and Planetary Physics, 2018
The Emeishan large igneous province (hereafter named by its acronym ELIP) is the first accepted large igneous region in China. The current study tries to reconstruct the density structure of the crust in this region.
Xi Zhang, Peng Wang, Tao Xu, Yun Chen, José Badal, JiWen Teng   +5 more
doaj   +1 more source

A sample dredged from the Alpha Ridge records evidence of an emergent volcanic setting at 90 Ma

Communications Earth & Environment
Recovering geological samples from the deep basins and ridges of the central Arctic Ocean presents significant challenges because of remote access and thick ice cover.
Marie-Claude Williamson, Grace E. Shephard, Kai Boggild, Rebecca Carey, Paul B. Hamilton, Dawn Kellett, Daniel Miggins, Anthony A. P. Koppers, Derek H. C. Wilton, Daniel J. MacDonald, Dominique Weis, Shuangquan Zhang, Brian L. Cousens, Simon E. Jackson, Duane C. Petts, Christopher M. Lawley, Erica Massey, Lotte M. Larsen, Wilfried Jokat, Jeff Harris   +19 more
doaj   +1 more source

Circum-Arctic lithosphere-basin evolution : An overview [PDF]

, 2016
Acknowledgements The Special Issue editors thank the contributors for their hard work and dedication in the preparation of the papers presented here, and also Victoria Pease for her active support throughout the process and in particular in co-convening ...
Lane, Larry S., Stephenson, Randell A.
core   +1 more source

Identifying crustal contributions in the Patagonian Chon Aike Silicic Large Igneous Province. [PDF]

Contrib Mineral Petrol, 2023
Foley ML, Putlitz B, Baumgartner LP, Renda EM, Ulianov A, Siron G, Chiaradia M.   +6 more
europepmc   +1 more source

Early Cambrian U-Pb zircon age and Hf-isotope data from the Guasayán pluton, Sierras Pampeanas, Argentina: implications for the northwestern boundary of the Pampean arc [PDF]

, 2016
An Early Cambrian pluton, known as the Guasayán pluton, has been identified in the central area of Sierra de Guasayán, northwestern Argentina. A U?Pb zircon Concordia age of 533 ± 4 Ma was obtained by LA-MC-ICP-MS and represents the first report of ...
Alasino, Pablo Horacio, Baldo, Edgardo Gaspar Agustín, Basei, Miguel A. S., da Costa Campos Neto, Mario, Dahlquist, Juan Andrés, Rapela, Carlos Washington, Uran, Gimena Mariel, Verdecchia, Sebastián Osvaldo, Zandomeni, Priscila Soledad   +8 more
core   +2 more sources

Emplacement of the Franklin large igneous province and initiation of the Sturtian Snowball Earth. [PDF]

Sci Adv, 2022
Pu JP, Macdonald FA, Schmitz MD, Rainbird RH, Bleeker W, Peak BA, Flowers RM, Hoffman PF, Rioux M, Hamilton MA.   +9 more
europepmc   +1 more source