Results 61 to 70 of about 39,183 (233)

Proterozoic Geology

Eos, Transactions American Geophysical Union, 1984
This book and its companion, Early Proterozoic Geology of the Great Lakes Region (Mem. 160 Geological Society of America, 1984), edited by L.G. Medaris, Jr., are the products of an International Proterozoic symposium held at the University of Wisconsin, Madison, May 18–21, 1981.
openaire   +1 more source

Photosynthetic primary production in the Mesoproterozoic

New Phytologist, EarlyView.
Summary The Mesoproterozoic atmosphere had more CO2 and less O2 than at present. While the upper ocean was oxygenated, the deeper ocean was euxinic or ferruginous. Primary production was performed by Chlorobia, Cyanobacteria, Proteobacteria, and Archaeplastida.
Patricia Sánchez‐Baracaldo, John A. Raven   +1 more
wiley   +1 more source

Microbially generated ferruginous crusts: A potential biosignature of continental input in coastal settings

Sedimentology, EarlyView.
ABSTRACT Thin ferruginous sandy crusts are common on top of sandstone beds in the Early Permian post‐glacial deposits of the Paraná Basin in southern Brazil. These crusts usually preserve wrinkle structures, suggesting that they might be a product of microbial mediation.
Patrícia Weschenfelder, Renata Guimarães Netto, Alisson Klayton Martins   +2 more
wiley   +1 more source

MISS diversity from saline lakes of Brazilian Pantanal: Origin, potential of preservation and comparison with examples of the Ediacaran‐Cambrian shallow depositional settings

Sedimentology, EarlyView.
ABSTRACT One of the largest wetlands on Earth, the Brazilian Pantanal contains roughly 10 000 natural lakes, about 1000 of which are hypersaline. In these environmentally stressful settings, animal life struggles to survive, while cyanobacteria form extensive mats.
Lucas V. Warren, Filipe G. Varejão, Lucas Inglez, Maria Julia Arrouy, Beatriz Christofoletti, Mario L. Assine   +5 more
wiley   +1 more source

Old subcontinental mantle zircon below Oahu

Communications Earth & Environment, 2021
Oceanic mantle-derived zircon grains recovered from pyroxenite xenoliths in Hawaii have 14-million-year-old rims, Cretaceous cores and Proterozoic lutetium-hafnium model-ages, according to mass spectrometry and electron microprobe analyses.
John D. Greenough, Sandra L. Kamo, Donald W. Davis, Kyle Larson, Zhen Zhang, Daniel Layton-Matthews, Joan De Vera, Bridget A. Bergquist   +7 more
doaj   +1 more source

Dating the cyanobacterial ancestor of the chloroplast [PDF]

, 2009
Cyanobacteria have played a pivotal role in the history of life on Earth being the first organism to carry out oxygenic photosynthesis, which changed atmospheric chemistry and allowed the evolution of Eukarya.
Amanda Castillo, Luisa Falcon, Susana Magallon   +2 more
core   +1 more source

Deconvolving the pre-Himalayan Indian margin – tales of crustal growth and destruction [PDF]

, 2018
The metamorphic core of the Himalaya is composed of Indian cratonic rocks with two distinct crustal affinities that are defined by radiogenic isotopic geochemistry and detrital zircon age spectra.
Ahmad, Ali, Ali, Ali, Ali, Ali, Ali, Amato, Aoki, Be’eri-Shlevin, Be’eri-Shlevin, Blades, Botev, Cawood, Cawood, Cawood, Chen, Chen, Clift, Collins, Collins, Cui, DeCelles, DeCelles, Ding, Dyck, Gansser, Ge, Gehrels, Gehrels, Griffin, Guynn, Gürsu, Han, Hassanzadeh, Hawkesworth, Hopkinson, Horstwood, Hu, Hu, Huang, Iizuka, Iizuka, Isozaki, Kaur, Kay, Keppie, Kohn, Le Fort, Le Fort, Lee, Li, Li, Li, Li, Li, Li, Long, Long, Martin, Martin, McQuarrie, McQuarrie, Merdith, Morag, Morag, Mottram, Myrow, Myrow, Myrow, Nowell, Pan, Parrish, Richards, Roberts, Roberts, Robinson, Robinson, Scholl, Searle, Shen, Shu, Singh, Sláma, Song, Spakman, Spencer, Spencer, Spencer, Spencer, Spencer, Stern, Stern, Su, Tate, Thimm, Thomas, Veevers, von Huene, Wang, Wang, Wang, Wang, Wang, Wang, Wang, Wang, Wang, Wang, Wang, Webb, Webb, Woodhead, Woodhead, Yakymchuk, Yan, Yao, Yao, Yao, Yao, Yao, Yin, Yu, Yu, Yu, Yu, Zhang, Zhang, Zhou, Zhou, Zhu, Zhu, Zou   +132 more
core   +4 more sources

Disentangling palaeoecological and outcrop controls on MISS occurrence in c. 1 Ga fluvio‐lacustrine facies of the Diabaig Formation, Scotland

Sedimentology, EarlyView.
ABSTRACT The c. 1 Ga Diabaig Formation of north‐west Scotland preserves diverse lacustrine and fluvial facies and abundant microbial and non‐microbial surficial sedimentary features. 172.6 m of section was logged across seven localities to assess the distribution of microbially induced sedimentary structures (MISS) relative to lithofacies, substrate ...
Seán T. Herron, Neil S. Davies, William J. McMahon   +2 more
wiley   +1 more source

The structure of the Western and Central parts of the Ukrainian schield. Controversial issues

Геофизический журнал, 2018
Some controversial issues of composing the Scheme of the fault megablock tectonics of the western half of the Ukrainian shield in connection with the decision of the Interdepartmental Tectonic Committee of Ukraine on drawing up the Tectonic map of the ...
О. B. Gintov, M. I. Orlyuk, V. A. Entin, I.K. Pashkevich, S. V. Mychak, M. I. Bakarzhieva, L. M. Shimkiv, A. V. Marchenko   +7 more
doaj   +1 more source

The faint young Sun problem [PDF]

, 2012
For more than four decades, scientists have been trying to find an answer to one of the most fundamental questions in paleoclimatology, the `faint young Sun problem'.
Abbot, Abelson, Altermann, Bada, Bada, Bahcall, Barghoorn, Barron, Beerling, Bekker, Belousova, Berner, Berner, Berner, Blake, Boothroyd, Budyko, Buick, Caldeira, Cameron, Canfield, Canup, Carr, Catling, Catling, Cess, Chambers, Chyba, Chyba, Chyba, Claussen, Cogley, Crowley, Crowley, Danielson, Davies, den Boorn, Denman, Deubner, DeWitt, Dhuime, Domagal-Goldman, Domagal-Goldman, Donn, Dorren, Driese, Emden, Emmanuel, Endal, Enderton, Evans, Farquhar, Ferreira, Feulner, Forget, Forster, Fröhlich, Fu, Georg Feulner, Goldblatt, Goldblatt, Goldblatt, Goldblatt, Goldblatt, Goodman, Goodwin, Gough, Graedel, Gray, Guzik, Guzik, Gérard, Güdel, Halevy, Haqq-Misra, Harrison, Hartmann, Hartmann, Hartmann, Hasenkopf, Haxton, Hay, Held, Henderson-Sellers, Henderson-Sellers, Hessler, Hoffman, Holland, Holland, Holland, Hoyle, Hren, Hunten, Hyde, Ikeda, Ingersoll, Intergovernmental Panel on Climate Change, Jaffrés, Jenkins, Jenkins, Jenkins, Jenkins, Jenkins, Jenkins, Jenkins, Kah, Karhu, Kasting, Kasting, Kasting, Kasting, Kasting, Kasting, Kasting, Kasting, Kasting, Kasting, Kasting, Kasting, Kasting, Kasting, Kasting, Kasting, Kasting, Kaufman, Kerrick, Kharecha, Kiehl, Kippenhahn, Kirschvink, Kirschvink, Knauth, Knauth, Knauth, Kopp, Kopp, Kral, Kress, Kring, Kristjánsson, Kröner, Kuhlbrodt, Kuhn, Kuhn, Kuhn, Laskar, Lean, Levine, Lin, Lindzen, Lindzen, Lissauer, Longdoz, Lowe, Lowe, Marshall, Marshall, Martin, McKay, McKay, McKay, Mel'nik, Miller, Miller, Milne, Minton, Mischna, Mitchell, Mohapatra, Mojzsis, Molnar, Munk, Munk, Munk, Navarra, Newman, Nisbet, Nisbet, Ohmoto, Orgel, Owen, Pace, Papaloizou, Paris, Pavlov, Pavlov, Pavlov, Pinto, Pollack, Pollack, Pollack, Pollack, Pollard, Pollard, Poulsen, Rages, Rages, Rampino, Rasool, Ringwood, Roberson, Robert, Rondanelli, Ronde, Rosing, Rossow, Rye, Sackmann, Sagan, Sagan, Sagan, Schatten, Schneider, Schopf, Schwarzschild, Sellers, Sessions, Shaviv, Shaw, Sheldon, Sleep, Sleep, Som, Stephens, Sterenborg, Stern, Stibbs, Stone, Stuart, Tarduno, Taylor, Tera, Thauer, Tian, Tian, Tomaschitz, Trainer, Trainer, Ueno, Ulrich, Valley, Walker, Walker, Walker, Walker, Walker, Walker, Wang, Warren, Warren, Watson, Weiss, Wetherill, Wetherill, Whitmire, Wigley, Wilde, Wildt, Williams, Williams, Williams, Woese, Wolf, Wood, Wood, Wordsworth, Young, Zahnle, Zahnle, Zahnle, Zahnle   +270 more
core   +1 more source