Results 41 to 50 of about 9,317 (244)
Frontiers in Earth Science, 2020 Archean-Proterozoic boundary represents a significant transitional phase in the Earth's history. Bastar Craton is one of the major Archean cratons in the Indian subcontinent with voluminous granites, supracrustal rocks, and tectonic belts.
Ajay Dev Asokan +4 more
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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.
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Overcoming Polyatomic Interferences in Sulfur Isotope Measurement Using MC‐ICP‐MS
Geostandards and Geoanalytical Research, EarlyView.Key Points Optimising plasma conditions via the normalised argon index (NAI) reduces polyatomic interferences, allowing accurate sulfur isotope measurement in low‐resolution mode on MC‐ICP‐MS. Low‐resolution mode enhances sensitivity by approximately threefold compared with conventional high‐resolution analysis.
Yang Yu +4 more
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The Effects of High-Grade Metamorphism on Cr-Spinel from the Archean Sittampundi Complex, South India [PDF]
, 2021 Davide Lenaz +3 more
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Journal of Petroleum Geology, EarlyView.ABSTRACT In the Recôncavo Basin, Northeast of Brazil, mud diapirs have been reported for decades, but their role within the basin's petroleum system remains poorly constrained. Here, we combine 2D seismic interpretation, field observations, and organic geochemical analyses of rocks and oil seeps to investigate the relationship between diapirism and ...
Cora Mattos +3 more
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Meteoritics &Planetary Science, EarlyView.Abstract Libyan Desert Glass (LDG) is an ~29 million years old, silica‐rich glass found in Western Egypt. Whether this glass formed in an impact cratering context associated with the hypervelocity collision of a cometary/asteroidal body or radiative heating during an airburst is debated. Determination of the formation temperatures and pressures of rare
Niccolò Magnani +6 more
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Komatiites From Mantle Transition Zone Plumes
Frontiers in Earth Science, 2020 During the Archean, episodic volcanism commonly included both plume- and arc-type magmatism, raising the issue of a possible link between “bottom up” and “top down” geodynamic processes.
Derek Wyman
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Examining Archean methanotrophy [PDF]
Earth and Planetary Science Letters, 2016 The carbon isotope ratios preserved in sedimentary rocks can be used to fingerprint ancient metabolisms. Organic carbon in Late Archean samples stands out from that of other intervals with unusually low δ^(13)C values (∼−45 to −60‰). It was hypothesized that these light compositions record ecosystem-wide methane cycling and methanotrophy, either of the
Slotznick, Sarah P. +1 more
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Meteoritics &Planetary Science, EarlyView.Abstract Fossil micrometeorites (MMs) recovered from lithified sedimentary rocks, particularly iron‐rich (I‐type) cosmic spherules (CSs) provide valuable insights into past dust‐forming events. Their abundances, when combined with estimates of local sedimentation rates can be used to reconstruct the flux of extraterrestrial dust.
Isabelle S. Mattia +2 more
wiley +1 more source
The Medicine Hat Block and the Early Paleoproterozoic Assembly of Western Laurentia
Geosciences, 2020 The accretion of the Wyoming, Hearne, and Superior Provinces to form the Archean core of western Laurentia occurred rapidly in the Paleoproterozoic. Missing from Hoffman’s (1988) original rapid aggregation model was the Medicine Hat block (MHB).
Jennifer N. Gifford +2 more
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