Results 111 to 120 of about 27,145 (212)

A hydrothermal karst-hosted U-P deposit related to Pangea break-up: Itataia deposit, Borborema Province, Northeastern Brazil - a review

Journal of the Geological Survey of Brazil, 2018
The Itataia U-P deposit holds the second largest uranium reserve in Brazil. All of the uranium is contained within the microcrystalline structure of fluorapatite, which is the ore mineral of the collophanite bodies.
José Adilson D. Cavalcanti, Maria Dulcinea M.R. Bessa, Roberto Ventura Santos, Cesar U.V. Veríssimo, Clovis Vaz Parente   +4 more
doaj   +1 more source

State‐Dependence of Polar Amplification in an Idealized GCM

Geophysical Research Letters, Volume 53, Issue 1, 16 January 2026.
Abstract Polar amplification (PA) is a robust feature of contemporary climate change, but its state‐dependence across different climate conditions is poorly understood despite potential relevance to paleoclimate records and future projections. Here we examine the state‐dependence of PA across a wide range of climate states in an idealized moist general
Andrew I. L. Williams, Timothy M. Merlis
wiley   +1 more source

The first animals: ca. 760-million-year-old sponge-like fossils from Namibia

South African Journal of Science, 2012
One of the most profound events in biospheric evolution was the emergence of animals, which is thought to have occurred some 600-650 Ma. Here we report on the discovery of phosphatised body fossils that we interpret as ancient sponge-like fossils and ...
C. Brain, Anthony Prave, Karl-Heinz Hoffmann, Anthony Fallick, Andre Botha, Donald Herd, Craig Sturrock, Iain Young, Daniel Condon, Stuart Allison   +9 more
doaj  

A case for biotic morphogenesis of coniform stromatolites

, 2004
Mathematical models have recently been used to cast doubt on the biotic origin of stromatolites. Here by contrast we propose a biotic model for stromatolite morphogenesis which considers the relationship between upward growth of a phototropic or ...
Arp, B.I. Henry, Barabási, Batchelor, Bauld, Bertrand-Sarfati, Brasier, Buick, Burne, Cohen, Garcia-Ruiz, Grotzinger, Grotzinger, Hofmann, Horodyski, Kaandorp, Kardar, Knoll, Lobkovsky, Lowe, M.J. Jackson, M.T. Batchelor, Maslov, R.V. Burne, Schopf, Verrecchia, Wainwright, Walter, Witten   +28 more
core   +1 more source

Detrital zircon from a late Paleozoic accretionary complex of SW Iberia (Variscan Belt): History of crustal growth and recycling at the Rheic convergent margin [PDF]

, 2012
In this study we present new U-Pb ages of detrital zircons from greywackes and quartzites of the Pulo do Lobo Anticline (PLA) that have been interpreted to represent a Late Paleozoic accretionary complex in SW Iberia.
Chichorro, M., Drost, K., Pereira, M.F., Silva, J.B., Sola, R.   +4 more
core  

Reappraisal of the lithological units of the Wuguan Complex: implication for the Paleozoic evolution of the Qinling orogenic belt

Frontiers in Earth Science
The Wuguan Complex, located along the southern margin of the Shangdan suture zone, plays a critical role in investigating the tectonic evolution of the Qinling orogenic belt and constraining the collision timing between the North and South China Blocks ...
Ge Wang, Xiaoying Liao, Liang Liu, Yawei Wang, Wenqiang Yang   +4 more
doaj   +1 more source

Geochronology and geochemistry of the Neoproterozoic–Mesozoic intrusive rocks in the Xinlin area, northeastern China: new constraints on the tectonic evolution of the Erguna block

Frontiers in Earth Science
The occurrence of intrusive rocks within the Xinlin area, northeastern China, provides insights into the Neoproterozoic–Mesozoic geodynamic setting of the Erguna block.
Sheng Lu, Sheng Lu, Sheng Lu, Sheng Lu, Chenglu Li, Masroor Alam, Zhichao Song, Xiannan Zhu, Anzong Fu, Wenpeng Yang   +9 more
doaj   +1 more source

Petrogenesis of Late Permian Mafic Rocks in the Western Guangxi Area, SW China: Implications for the Emeishan Mantle Plume Magmatism. [PDF]

ACS Omega
Zhang Y, Zhang Z, Yuan Y.
europepmc   +1 more source

Independent origins of spicules reconcile paleontological and molecular evidence of sponge evolutionary history. [PDF]

Sci Adv
Rossi ME, Keating JN, Kenny NJ, Giacomelli M, Álvarez-Carretero S, Schuster A, Cárdenas P, Taboada S, Koutsouveli V, Donoghue PCJ, Riesgo A, Pisani D.   +11 more
europepmc   +1 more source

Integrated optical and radar remote sensing for litho-structural mapping of the Kerdous and Ait Abdellah inliers, western Anti-Atlas, Morocco. [PDF]

Sci Rep
Aadaj J, Tabit A, Algouti A, Aydda A, Moujane S, Agli S, Farah A, Errami M, Shebl A.   +8 more
europepmc   +1 more source