Results 51 to 60 of about 11,453 (209)

Archean geochemistry

Eos, Transactions American Geophysical Union, 1984
A cross section of the Archean crust provided the focus of the 1983 Archean Geochemistry and Early Crustal Genesis Workshop that convened in Ottawa on August 10, 1983. Forty‐six geoscientists registered: 24 from the United States, 16 from Canada, three from Australia, and one each from West Germany, the Peoples' Republic of China, and Zimbabwe.
openaire   +1 more source

Sedimentology of silica granules and haematite in the 3.47 Ga Antarctic Creek Member, Mount Ada Basalt, Western Australia

Sedimentology, EarlyView.
ABSTRACT The Paleoarchean Antarctic Creek Member of the Mount Ada Basalt, Eastern Pilbara Terrane, Western Australia, includes beds of jasper and white chert composed of sand‐sized silica granules that often contain or are mixed with silt‐sized particles of haematite.
Donald R. Lowe, Gary R. Byerly
wiley   +1 more source

Evolution Model for the Paleoproterozoic Talvivaara Mudstone‐Hosted Ni‐Zn‐Cu‐Co Deposit in Fennoscandia

Terra Nova, EarlyView.
ABSTRACT The Paleoproterozoic Talvivaara mudstone is a very large sulfidic Ni‐Co deposit that records enhanced organic matter accumulation during the global Shunga Event. Here, rock geochemistry and microscale S and Fe isotope composition of in situ pyrrhotites and pyrites are studied in well‐characterised, well‐preserved drill core samples.
Raimo Lahtinen, Jaakko J. Laitala, Joonas J. Virtasalo, Martin J. Whitehouse   +3 more
wiley   +1 more source

Ductile Extrusion Triggered by Continental Collision in NE Brazil

Terra Nova, EarlyView.
ABSTRACT The Borborema Province in northeastern Brazil hosts one of the world's largest strike‐slip shear zone networks, active during the late Neoproterozoic assembly of West Gondwana. Whether these shear zones initiated during active continental collision or as a post‐orogenic response to far‐field stresses remains debated.
L. R. Tesser, C. E. Ganade, C. R. Cioffi, J. B. Forshaw, M. Hueck, E. Celis, M. A. S. Basei   +6 more
wiley   +1 more source

The continental record and the generation of continental crust

, 2012
Continental crust is the archive of Earth history. The spatial and temporal distribution of Earth's record of rock units and events is heterogeneous; for example, ages of igneous crystallization, metamorphism, continental margins, mineralization, and ...
Hawkesworth, Chris, Cawood, Peter Anthony, Hawkesworth, C. J., Dhuime, B., P.A. Cawood, Dhuime, Bruno Philippe Marcel, Cawood, P. A., C.J. Hawkesworth, B. Dhuime   +8 more
core   +1 more source

Numerical modelling of Archean Earth tectonics and crust formation

, 2022
The thesis focused on investigating early (Archean) Earth geodynamics using numerical modelling and benchmarking the results against the preserved rock record.
PRASANNA MAHESH GUNAWARDANA (12113052)
core   +1 more source

Continental growth and the crustal record

, 2013
Funding: Natural Environment Research Council (NERC) (grant NE/J021822/1) and the University of St. Andrews.The continental crust is the archive of Earth history.
Hawkesworth, Chris, Cawood, Peter, Dhuime, Bruno   +2 more
core   +1 more source

Dating the cyanobacterial ancestor of the chloroplast

, 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  

Archean granitoids of the Aravalli Craton, northwest India

, 2020
Table 1: Major (wt%) and trace element (ppm) data of Archean granitoids of the Aravalli Craton, NW India; Table 2: Nd-isotope data of Archean granitoids of the Aravalli Craton, NW ...
Md Sayad Rahaman (8422398), Rajneesh Bhutani (5844521), M. Satyanarayanan (8422401), Iftikhar Ahmad (2793085), M.A.E. Mondal (8422395)   +4 more
core   +1 more source

Images of a lower-crustal oceanic slab: Direct evidence for tectonic accretion in the Archean western Superior province

, 2003
The Archean western Superior province in Canada is the type area for proposed Archean plate tectonics. Seismic images from this region provide direct evidence for assembly of the craton by terrane accretion and for a large slab of remnant oceanic crust ...
Helmstaedt, H. H., Van der Velden, A., Musacchio, G., Thurston, P. C., Rarrab, R. M., White, D. J., Hall, L.   +6 more
core   +1 more source