Results 51 to 60 of about 8,820 (215)

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.
Luisa Falcon, Susana Magallon, Amanda Castillo   +2 more
core  

Zircon REE patterns and geochemical characteristics of Paleoproterozoic anatectic granite in the northern Tarim Craton, NW China: implications for the reconstruction of the Columbia supercontinent

, 2012
Because Archean basement rocks are sparsely distributed around the Tarim Basin, little is known of the relationship between the Tarim Craton and the Paleo- to Mesoproterozoic Columbia supercontinent.
Chao Yuan, Kroener, A, Xiaoping Long, Sun, M, Long, X, Hu, A, Alfred Kröner, Min Sun, Yuan, Chao, Hu, Aiqin, Aiqin Hu, Sun, Min, Kroener, Alfred, Long, Xiaoping, Yuan, C   +14 more
core   +1 more source

Geological and isotopic characteristics of granites from the Western Pernambuco-Alagoas Domain: implications for the crustal evolution of the Neoproterozoic Borborema Province

Brazilian Journal of Geology
The Western Pernambuco-Alagoas Domain is a complex tectonic domain of the Southern part of the Neoproterozoic Borborema Province. It borders the Northern margin of São Francisco Craton. U-Pb and Sm-Nd data discussed in this work show that, in the Western
Rodrigo Fabiano da Cruz, Márcio Martins Pimentel, Ana Cláudia de Aguiar Accioly, Joseneusa Brilhante Rodrigues   +3 more
doaj   +1 more source

Rodingite‐Derived Melt as a Recipe for Ultra‐Calcic Magmas

Geophysical Research Letters, Volume 53, Issue 18, 28 September 2026.
Abstract Rodingite is a high‐CaO rock formed by Ca‐rich fluid metasomatism on mafic protoliths. It typically occurs within serpentinite and represents an often‐overlooked constituent of the altered oceanic lithosphere that may be subducted into the mantle.
Mingdi Gao, Yu Wang, Shi‐Dong Guan, Yi‐Xiang Chen, Chao‐Yang Guo, Yi‐Gang Xu   +5 more
wiley   +1 more source

Pyrite paragenesis and multiple sulfur isotope distribution in late Archean and early Paleoproterozoic Hamersley Basin sediments

, 2008
The sulfur isotope record in late Archean and early Paleoproterozoic rocks is of considerable importance because it provides evidence for changes in early Earth atmospheric oxygen levels and potentially constrains the origin and relative impact of ...
Kim A. Baublys, Baublys, Kim A., Elisa Young, Partridge, Michaela A., Suzanne D. Golding, Young, Elisa, Michaela A. Partridge, Golding, Suzanne D.   +7 more
core   +1 more source

Paleoproterozoic post-orogenic magmatism in southern Finland; geochemical, geochronological and Sr-Nd isotopic constraints on origin and magmatic evolution [PDF]

Bulletin of the Geological Society of Finland
Fifteen post-orogenic, basic to acidic High-Barium-Strontium (HiBaSr) intrusions of shoshonitic affinity have been recognized in central and southern Finland.
Oliver Teräs, Kaisa Nikkilä, Perttu Mikkola, Anna Kotilainen, Olav Eklund, O. Tapani Rämö   +5 more
doaj   +1 more source

Provenance of Middle Triassic sediments in the Southern Youjiang Basin: Insights from detrital zircon geochronology and tourmaline geochemistry

The Depositional Record, Volume 12, Issue 4, September 2026.
Middle Triassic turbidites in the Youjiang Basin were chiefly derived from a Late Palaeozoic continental arc along the southeastern South China Block, as revealed by detrital zircon U–Pb geochronology and tourmaline geochemistry, supporting a tectonic model driven by Paleo‐Pacific subduction rather than Paleo‐Tethyan closure.
Yumei Wei, Lanqiu Meng, Yu Zhang
wiley   +1 more source

NEW DATA ON HIGH-CARBONACEOUS SHUNGIT-LIKE ROCKS OF MLYNKOVSKII AREA (KRIVOI ROG-KREMENCHUG ZONE, UKRAINIAN SHIELD)

Геохімія техногенезу, 2019
The paper presents the results of mineralogical, petrographic, electron microscopy, isotopic and X-ray structural studies of Paleoprotero-zoic high-carbon schungite-like rocks of the Mlynkivska area (Pravoberezhnyi district of the Kryvyi Rih-Kremenchuk ...
Yatsenko V., Zaborovskaya L., Pokalyuk V., Lashko S., Zaborovsky V., Lyzhachenko N.   +5 more
doaj   +1 more source

Sediment Characteristics and Architecture of Triangular‐Shaped Murtoos: A Test of Murtoo Formation Hypotheses

Earth Surface Processes and Landforms, Volume 51, Issue 9, September 2026.
Murtoos and murtooized terrains are new types of subglacial landforms found in the Fennoscandian Ice Sheet (FIS) and Cordilleran Ice Sheet (CIS) regions. LiDAR‐based morphometric analyses have revealed substantial morphometric diversity among murtoos and murtoo‐related landforms, while sedimentological excavations have documented a wide range of ...
A. E. K. Ojala, S. Soini, J. Mäkinen, J. Hovikoski, P. Sarala, A. Hepburn, K. Kajuutti, E. Ahokangas, J. Kautto   +8 more
wiley   +1 more source

Petrogenesis and Tectonic Implication of the Newly Identified Rhyacian and Orosirian Orthogneisses in the Northwestern Part of the Gyeonggi Massif (Soyeonpyeongdo and Ganghwado Areas), South Korea: Constrained From Whole‐Rock Geochemistry and Zircon U‐Pb‐Hf Isotopic Compositions

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 9, September 2026.
Abstract The Gyeonggi Massif is one of the major Precambrian basements in the Korean Peninsula where Paleoproterozoic orthogneiss and paragneiss were widely exposed. In this study, newly identified Rhyacian to Orosirian meta‐igneous rocks from the northwestern Gyeonggi Massif (Soyeonpyeongdo and Ganghwado areas) were investigated to elucidate their ...
Seung Hwan Lee, Deung‐Lyong Cho, Jeong‐Yeong Park, Sung Won Kim, Byung Choon Lee, Mingguo Zhai   +5 more
wiley   +1 more source