The Neoarchean is a geologic era within the Archaean. It spans the period of time from 2,800 to 2,500 million years ago—the period being defined chronometrically and not referenced to a specific level in a rock section on Earth. Oxygenic photosynthesis first evolved in this era and was a...
The Sm–Nd ages obtained from the present study, along with geochronological information from Singhbhum Craton, suggest a magmatic linkage between SGT (including southern Dharwar Craton) and Singhbhum Craton during the Neoarchean period. The older ages obtained from the mafic dykes of the present ...
However, recent 2D petrological-thermomechanical modelling indicates that a “prototype” of modern style plate tectonics may have existed in the Meso-Neoarchean (Sizova et al., 2010) and the subduction-collision regime may already have emerged in the (pre-)Neoarchean period (Brown, 2006, Brown,...
The coexistence of divergent (spreading ridge) and convergent (subduction zone) plate boundaries at which lithosphere is respectively generated and destroyed is the hallmark of plate tectonics. Here, we document temporally- and spatially-associated Neoar
2.7 Ga is a major period of crustal growth in the NCC. Geochemical signatures of the ca. 2.7 Ga tonalitic gneiss reflect that their protoliths formed by partial melting of hydrated mafic rocks with variable proportions of the amphibole and garnet residues to be left behind in the residuum ...
mantle temperature on the basis of the thermomechanical numerical modeling results and is often referred to as “hot subduction”44,45. Therefore, the Mesoarchean–Neoarchean transition (~2.8 Ga) is considered as a critical period for the transformation of the crust–mantle dynamics, in which ...
第44卷 第1期 2014年01月 吉林大学学报(地球科学版) JournalofJilinUniversity(EarthScienceEdition) Vol.44 No.1 Jan.2014 李承东,许雅雯,张庆红,等.吉南新太古代高镁安山岩及其地质意义.吉林大学学报:地球科学版,2014,44(1):186197. doi:10.13278/j.cnki.jjuese.201401115. LiChengdong,XuYawen,ZhangQingho...
The Mesoarchean to Neoarchean period (ca. 3.0–2.5 Ga) is the most important stage during the emergence and evolution of plate tectonics. However, plate subduction at this time may have been less stable and perhaps more susceptible to the lubrication effect of sediments than the modern ...
The second case belonging to Meso-proterozoic period is related to the collision of the Bundelkhand craton and the Bhandara-Bastar craton (BBC) and the Dharwar craton (DC) in Central India along the Satpura Mobile Belt (SMB) and the BBC and the DC along the Godavari Proterozoic Belt due ...
Combined with early studies, conclusions are: 1) Intrusive rocks with the involvement of mantle-derived materials have a narrow range of magmatic zircon ages from 2525 to 2546Ma, and supracrustal rocks were formed during the same period. 2) Ancient crustal remnants (>2600Ma) are present, ...