Log in

Relevant bibliographies by topics / Archaean / Journal articles

To see the other types of publications on this topic, follow the link: Archaean.

Journal articles on the topic 'Archaean'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Archaean.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Sleep, Norman H. "Archaean palaeosols and Archaean air." Nature 432, no. 7016 (2004): 1. http://dx.doi.org/10.1038/nature03167.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Sandaa, Ruth-Anne, Øivind Enger, and Vigdis Torsvik. "Abundance and Diversity of Archaea in Heavy-Metal-Contaminated Soils." Applied and Environmental Microbiology 65, no. 8 (1999): 3293–97. http://dx.doi.org/10.1128/aem.65.8.3293-3297.1999.

Full text

Abstract:

ABSTRACT The impact of heavy-metal contamination on archaean communities was studied in soils amended with sewage sludge contaminated with heavy metals to varying extents. Fluorescent in situ hybridization showed a decrease in the percentage of Archaea from 1.3% ± 0.3% of 4′,6-diamidino-2-phenylindole-stained cells in untreated soil to below the detection limit in soils amended with heavy metals. A comparison of the archaean communities of the different plots by denaturing gradient gel electrophoresis revealed differences in the structure of the archaean communities in soils with increasing he

APA, Harvard, Vancouver, ISO, and other styles

3

Ohmoto, Hiroshi, and Yumiko Watanabe. "Archaean palaeosols and Archaean air (reply)." Nature 432, no. 7016 (2004): 1–2. http://dx.doi.org/10.1038/nature03168.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Herzberg, Claude. "Archaean drips." Nature Geoscience 7, no. 1 (2013): 7–8. http://dx.doi.org/10.1038/ngeo2033.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

WINDLEY, B. "Archaean Geochemistry." Earth-Science Reviews 24, no. 1 (1987): 67. http://dx.doi.org/10.1016/0012-8252(87)90051-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Mathlouthi, Nour El Houda, Imen Belguith, Mariem Yengui, et al. "The Archaeome’s Role in Colorectal Cancer: Unveiling the DPANN Group and Investigating Archaeal Functional Signatures." Microorganisms 11, no. 11 (2023): 2742. http://dx.doi.org/10.3390/microorganisms11112742.

Full text

Abstract:

Background and Aims: Gut microbial imbalances are linked to colorectal cancer (CRC), but archaea’s role remains underexplored. Here, using previously published metagenomic data from different populations including Austria, Germany, Italy, Japan, China, and India, we performed bioinformatic and statistical analysis to identify archaeal taxonomic and functional signatures related to CRC. Methods: We analyzed published fecal metagenomic data from 390 subjects, comparing the archaeomes of CRC and healthy individuals. We conducted a biostatistical analysis to investigate the relationship between Ca

APA, Harvard, Vancouver, ISO, and other styles

7

Imachi, Hiroyuki, Masaru K. Nobu, Nozomi Nakahara, et al. "Isolation of an archaeon at the prokaryote–eukaryote interface." Nature 577, no. 7791 (2020): 519–25. http://dx.doi.org/10.1038/s41586-019-1916-6.

Full text

Abstract:

Abstract The origin of eukaryotes remains unclear1–4. Current data suggest that eukaryotes may have emerged from an archaeal lineage known as ‘Asgard’ archaea5,6. Despite the eukaryote-like genomic features that are found in these archaea, the evolutionary transition from archaea to eukaryotes remains unclear, owing to the lack of cultured representatives and corresponding physiological insights. Here we report the decade-long isolation of an Asgard archaeon related to Lokiarchaeota from deep marine sediment. The archaeon—‘Candidatus Prometheoarchaeum syntrophicum’ strain MK-D1—is an anaerobic

APA, Harvard, Vancouver, ISO, and other styles

8

Cockell, Charles S. "Photobiological uncertainties in the Archaean and post-Archaean world." International Journal of Astrobiology 1, no. 1 (2002): 31–38. http://dx.doi.org/10.1017/s1473550402001003.

Full text

Abstract:

The notion that ultraviolet (UV) fluxes, and thus biologically weighted irradiances, were higher on Archaean Earth than on present-day Earth has been a pervasive influence on thinking concerning the nature of early Earth. It directly influences calculations concerning protection strategies that may or may not have been required by early life. Our knowledge of the Earth's changing UV radiation climate over time depends upon our knowledge of a diversity of factors, the magnitudes of which are uncertain. Here these uncertainties are explored. During the Archaean Era, calculations of the surface p

APA, Harvard, Vancouver, ISO, and other styles

9

Hattori, Keiko, and Eion M. Cameron. "Archaean magmatic sulphate." Nature 319, no. 6048 (1986): 45–47. http://dx.doi.org/10.1038/319045a0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Rollinson, Hugh, and Martin Whitehouse. "Archaean crustal evolution." Precambrian Research 112, no. 1-2 (2001): 1–3. http://dx.doi.org/10.1016/s0301-9268(01)00167-x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Chin, G. J. "MICROBIOLOGY: Archaean Viruses." Science 294, no. 5544 (2001): 959e—961. http://dx.doi.org/10.1126/science.294.5544.959e.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Singh, V. P., O. P. Singh, and C. L. Singh. "Structural Appraisal of Parts of Archaeans, Satpuras and Chhattisgarh Basins Around Mandala - Raipur Districts, M.P., India, Using Total Magnetic Field Data." Journal Geological Society of India 50, no. 6 (1997): 709–16. http://dx.doi.org/10.17491/jgsi/1997/500606.

Full text

Abstract:

Abstract Detailed ground magnetic surveys over parts of Archaeans. Satpuras and Chhattisgarh basins belonging to different ages around Mandala-Raipur has been carried out. Detailed investigations provide depth of magnetic sources, basement structural trend. nature of intrusive bodies and thickness of sediments in the basins. The basement structural trend along the five profiles in Archaeans (AA'and BB'), Satpuras (CC') and Chhattisgarh (DD' and EE') have been derived which ranges from 1.5 to 3.5 km. The Archaean and Chattisgarh basins show two dyke like features at depth of 0.28 and 1.26 km. I

APA, Harvard, Vancouver, ISO, and other styles

13

Roberts, D. E. "Archaean Geochemistry: the Origin and Evolution of the Archaean Continental Crust." Precambrian Research 34, no. 3-4 (1987): 376–78. http://dx.doi.org/10.1016/0301-9268(87)90011-8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Kramers, J. D. "Archaean geochemistry: The origin and evolution of the archaean continental crust." Chemical Geology 56, no. 3-4 (1986): 336–37. http://dx.doi.org/10.1016/0009-2541(86)90015-x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Bridgwater, David. "Archaean Geochemistry. The Origin and Evolution of the Archaean Continental Crust." Geochimica et Cosmochimica Acta 50, no. 9 (1986): 2119. http://dx.doi.org/10.1016/0016-7037(86)90265-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Bridgwater, D., and L. Schiøtte. "The Archaean gneiss complex of northern Labrador A review of current results, ideas and problems." Bulletin of the Geological Society of Denmark 39 (December 20, 1991): 153–66. http://dx.doi.org/10.37570/bgsd-1991-39-06.

Full text

Abstract:

1. The early Archaean rocks in northern Labrador can be subdivided into the ea. 3.78 Ga Nulliak supracrustal association, the migmatitic Uivak I gneisses, the dominant phase of which was emplaced at ea. 3.73 Ga, and the Uivak II augen gneiss. Inherited low-U rounded inclusions within igneous zircons in the Uivak I gneisses have ages between 3.73 and 3.86 Ga and are more likely to have been derived from a pre-existing high-grade metamorphic gneiss complex than from the Nulliak association. In the early Archaean there were probably several rapid cycles of sedimentary deposition and volcanism fo

APA, Harvard, Vancouver, ISO, and other styles

17

Long, Xi, Hong Xue, and J. Tze-Fei Wong. "Descent of Bacteria and Eukarya From an Archaeal Root of Life." Evolutionary Bioinformatics 16 (January 2020): 117693432090826. http://dx.doi.org/10.1177/1176934320908267.

Full text

Abstract:

The 3 biological domains delineated based on small subunit ribosomal RNAs (SSU rRNAs) are confronted by uncertainties regarding the relationship between Archaea and Bacteria, and the origin of Eukarya. The similarities between the paralogous valyl-tRNA and isoleucyl-tRNA synthetases in 5398 species estimated by BLASTP, which decreased from Archaea to Bacteria and further to Eukarya, were consistent with vertical gene transmission from an archaeal root of life close to Methanopyrus kandleri through a Primitive Archaea Cluster to an Ancestral Bacteria Cluster, and to Eukarya. The predominant sim

APA, Harvard, Vancouver, ISO, and other styles

18

BOGATYREVA, NATALYA S., ALEXEI V. FINKELSTEIN, and OXANA V. GALZITSKAYA. "TREND OF AMINO ACID COMPOSITION OF PROTEINS OF DIFFERENT TAXA." Journal of Bioinformatics and Computational Biology 04, no. 02 (2006): 597–608. http://dx.doi.org/10.1142/s0219720006002016.

Full text

Abstract:

Archaea, bacteria and eukaryotes represent the main kingdoms of life. Is there any trend for amino acid compositions of proteins found in full genomes of species of different kingdoms? What is the percentage of totally unstructured proteins in various proteomes? We obtained amino acid frequencies for different taxa using 195 known proteomes and all annotated sequences from the Swiss–Prot data base. Investigation of the two data bases (proteomes and Swiss–Prot) shows that the amino acid compositions of proteins differ substantially for different kingdoms of life, and this difference is larger b

APA, Harvard, Vancouver, ISO, and other styles

19

Halla, Jaana. "Highlights on Geochemical Changes in Archaean Granitoids and Their Implications for Early Earth Geodynamics." Geosciences 8, no. 9 (2018): 353. http://dx.doi.org/10.3390/geosciences8090353.

Full text

Abstract:

The Archaean (4.0–2.5 Ga) continental crust is mainly composed of granitoids, whose geochemical characteristics are a function of their formation mechanisms and components, as well as physical conditions of their source. Therefore, revealing changes in Archaean geodynamic processes requires understanding of geochemical changes in Archaean granitoids. This paper compares key geochemical signatures in granitoid occurrences from the Eoarchaean to Neoarchaean Eras and aims to highlight changes or variations in their geochemical signatures. The study is performed by exploring and comparing geochemi

APA, Harvard, Vancouver, ISO, and other styles

20

Sleep, N. H. "The Hadean-Archaean Environment." Cold Spring Harbor Perspectives in Biology 2, no. 6 (2010): a002527. http://dx.doi.org/10.1101/cshperspect.a002527.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Kasting, James F. "Archaean atmosphere and climate." Nature 432, no. 7016 (2004): 1. http://dx.doi.org/10.1038/nature03166.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Ebinger, Cindy. "Archaean atmosphere and lithosphere." Astronomy and Geophysics 41, no. 3 (2000): 3.27–3.28. http://dx.doi.org/10.1046/j.1468-4004.2000.00327.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Nisbetand, E. G., and T. K. Kyser. "Archaean carbon and gold." Nature 331, no. 6153 (1988): 210–11. http://dx.doi.org/10.1038/331210b0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

VAN SCHMUS, W. R. "Crustal Geochemistry: Archaean Geochemistry." Science 231, no. 4739 (1986): 751–52. http://dx.doi.org/10.1126/science.231.4739.751.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Gomes, Maya L. "An Archaean oxygen oasis." Nature Geoscience 11, no. 2 (2018): 84–85. http://dx.doi.org/10.1038/s41561-018-0058-z.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Parman, Stephen. "An Archaean mushy mantle." Nature Geoscience 11, no. 2 (2018): 85–86. http://dx.doi.org/10.1038/s41561-018-0060-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Johnson, Benjamin W., and Boswell A. Wing. "Limited Archaean continental emergence reflected in an early Archaean 18O-enriched ocean." Nature Geoscience 13, no. 3 (2020): 243–48. http://dx.doi.org/10.1038/s41561-020-0538-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Pearson, D. G., G. A. Snyder, S. B. Shirey, L. A. Taylor, R. W. Carlson, and N. V. Sobolev. "Archaean Re–Os age for Siberian eclogites and constraints on Archaean tectonics." Nature 374, no. 6524 (1995): 711–13. http://dx.doi.org/10.1038/374711a0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Shestakov, Sergey V. "The role of archaea in the origin of eukaryotes." Ecological genetics 15, no. 4 (2017): 52–59. http://dx.doi.org/10.17816/ecogen15452-59.

Full text

Abstract:

A key role of particular evolutionary branch of archaea in the emergence of eukaryotic cell is considered on the basis of phylogenomics. Genomes of recently discovered uncultivated proteoarchaea belonging to Lokiarchaea and Asgard-group contain a large sets of eukaryotic-like genes. This allows to suggest that ancient forms of such archaean could participate in symbiotic fusion with bacteria serving as a mitochondrial progenitor. The open questions concerning properties of LECA (so-called last eukaryotic common ancestor) are discussed in the frame of endosymbiotic hypothesis of eukaryogenesis.

APA, Harvard, Vancouver, ISO, and other styles

30

Andersson, U. B., L. A. Neymark, and K. Billström. "Petrogenesis of Mesoproterozoic (Subjotnian) rapakivi complexes of central Sweden: implications from U–Pb zircon ages, Nd, Sr and Pb isotopes." Transactions of the Royal Society of Edinburgh: Earth Sciences 92, no. 3 (2001): 201–28. http://dx.doi.org/10.1017/s0263593300000237.

Full text

Abstract:

ABSTRACTU-Pb zircon geochronology of Mesoproterozoic (Subjotnian) rapakivi complexes in central Sweden yields: 1526 ± 3 Ma (Mullnäset), 1524 ± 3 Ma (Mårdsjö), 1520 ± 3 Ma (Nordsjö) and 1497 ± 6 Ma (Rödön). Together with complexes further S in Sweden, they constitute the westernmost, youngest (1·53−1·47 Ga) belt of rapakivi magmatism in the Fennoscandian shield.The low initial εNd values (−8·9 to −4·8) of all studied Subjotnian basic, intermediate and silicic rocks, require an input from an old (Archaean) low-radiogenic source component, as evidence for Palaeoproterozoic protoliths in the age r

APA, Harvard, Vancouver, ISO, and other styles

31

Nutman, Allen P. "Tectonostratigraphic terranes within Archaean gneiss complexes: examples from Western Australia and southern West Greenland." Bulletin of the Geological Society of Denmark 39 (December 20, 1991): 199–211. http://dx.doi.org/10.37570/bgsd-1991-39-09.

Full text

Abstract:

New field work and isotopic data show that the Godthabsfjord region of West Greenland consists of a collage of tectonostratigraphic terranes, which evolved separately prior to tectonic juxtaposition in the late Archaean. In Western Australia the Narryer Gneiss Complex, which lies on the northwestern margin of the Yilgarn Craton, is, unlike the Godthabsfjord region, very poorly exposed (less than 1 % ). In consequence it is impossible to follow geological boundaries in this complex, and instead the complex has been studied by a very extensive use of within-grain zircon U-Pb geochronology on the

APA, Harvard, Vancouver, ISO, and other styles

32

Kalsbeek, F. "The tectonic framework of the Precambrian shield of Greenland A review of new isotopic evidence." Rapport Grønlands Geologiske Undersøgelse 128 (December 31, 1986): 55–64. http://dx.doi.org/10.34194/rapggu.v128.7924.

Full text

Abstract:

There is now reliable isotopic evidence that most of the crystalline basement of Greenland consists of Archaean (>2500 Ma) rocks: only in the Ketilidian mobile belt of southemmost Greenland no Archaean rocks have yet been found. Proterozoic orogenic activity was widespread in the Nagssugtoqidian and Rinkian mobile belts of central and northem West Greenland, and peaked at c. 1850 Ma. There is some evidence that the Nagssugtoqidian mobile belt may define the boundary between two once separate Archaean continental plates and it is possibie that comparable plate boundaries also exist elsewhere

APA, Harvard, Vancouver, ISO, and other styles

33

Radhakrishna, B. P., and M. Ramakrishnan. "Archaean-Proterozoic Boundary in India." Journal Geological Society of India 32, no. 4 (1988): 263–78. http://dx.doi.org/10.17491/jgsi/1988/320401.

Full text

Abstract:

Abstract Greenstone belts in India are predominantly Archaean with minor development in Proterozoic. The important greenstone belts of India, like the Dharwar of South India, Iron-Ore Group of Eastern India and Bailadilla Group of Central India, are of Late Archaean age and show characteristics transitional to Proterozoic. The end of the Archaean is marked by a burst of granitic activity. Two independent continental blocks-a southern Peninsular Block and a northern Foreland Block are recognised. The Early Proterozoic successions in India are formed in rifted basins fringing these two Archaean

APA, Harvard, Vancouver, ISO, and other styles

34

Wang, Yinzhao, Ruize Xie, Jialin Hou, et al. "The late Archaean to early Proterozoic origin and evolution of anaerobic methane‐oxidizing archaea." mLife 1, no. 1 (2022): 96–100. http://dx.doi.org/10.1002/mlf2.12013.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Jansson, B. P. Mattias, Laurence Malandrin, and Hans E. Johansson. "Cell Cycle Arrest in Archaea by the Hypusination Inhibitor N1-Guanyl-1,7-Diaminoheptane." Journal of Bacteriology 182, no. 4 (2000): 1158–61. http://dx.doi.org/10.1128/jb.182.4.1158-1161.2000.

Full text

Abstract:

ABSTRACT Hypusination is an essential posttranslational modification unique to archaeal and eukaryotic protein synthesis initiation factor 5A (aIF5A and eIF5A, respectively). We have investigated the effect of the efficient hypusination inhibitorN 1-guanyl-1,7-diaminoheptane (GC7) on four archaeal and one bacterial species. We found that (i) archaea are sensitive to GC7, whereas the bacteriumEscherichia coli is not, (ii) GC7 causes rapid and reversible arrest of growth of the archaeon Sulfolobus acidocaldarius, and (iii) the growth arrest is accompanied by a specific reversible arrest of the c

APA, Harvard, Vancouver, ISO, and other styles

36

Baofeng, Shen, Peng Xiaoliang, Luo Hui, and Mao Debao. "Archaean Greenstone Belts in China." Acta Geologica Sinica - English Edition 7, no. 1 (2009): 15–29. http://dx.doi.org/10.1111/j.1755-6724.1994.mp7001002.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Nutman, A. P., and K. Ehlers. "Archaean crust near Broken Hill?" Australian Journal of Earth Sciences 45, no. 5 (1998): 687–94. http://dx.doi.org/10.1080/08120099808728426.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

de Wit, Maarten J., Cornel E. J. de Ronde, Marian Tredoux, et al. "Formation of an Archaean continent." Nature 357, no. 6379 (1992): 553–62. http://dx.doi.org/10.1038/357553a0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Nisbet, E. G. "Igneous petrology: Archaean mantle models." Nature 320, no. 6060 (1986): 306–7. http://dx.doi.org/10.1038/320306a0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Mallikarjuna, C., G. V. Devapriyan, V. Balachandran, and P. Harinadha Babu. "Archaean Stromatolite Near Bhimasamudra, Karnataka." Journal Geological Society of India 30, no. 2 (1987): 159–61. http://dx.doi.org/10.17491/jgsi/1987/300206.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Towe, Kenneth M. "Aerobic respiration in the Archaean?" Nature 348, no. 6296 (1990): 54–56. http://dx.doi.org/10.1038/348054a0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

de Wit, Maarten, and Christien Thiart. "Metallogenic fingerprints of Archaean cratons." Geological Society, London, Special Publications 248, no. 1 (2005): 59–70. http://dx.doi.org/10.1144/gsl.sp.2005.248.01.03.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Nisbet, Euan. "The realms of Archaean life." Nature 405, no. 6787 (2000): 625–26. http://dx.doi.org/10.1038/35015187.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Schopf, J. William. "Fossil evidence of Archaean life." Philosophical Transactions of the Royal Society B: Biological Sciences 361, no. 1470 (2006): 869–85. http://dx.doi.org/10.1098/rstb.2006.1834.

Full text

Abstract:

Evidence for the existence of life during the Archaean segment of Earth history (more than 2500 Myr ago) is summarized. Data are presented for 48 Archaean deposits reported to contain biogenic stromatolites, for 14 such units reported to contain 40 morphotypes of putative microfossils, and for 13 especially ancient, 3200–3500 Myr old geologic units for which available organic geochemical data are also summarized. These compilations support the view that life's existence dates from more than or equal to 3500 Myr ago.

APA, Harvard, Vancouver, ISO, and other styles

45

Smithies, R. Hugh, David C. Champion, and Shen-Su Sun. "The case for Archaean boninites." Contributions to Mineralogy and Petrology 147, no. 6 (2004): 705–21. http://dx.doi.org/10.1007/s00410-004-0579-x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Schiøtte, L., A. P. Nutman, and D. Bridgwater. "U–Pb ages of single zircons within "Upernavik" metasedimentary rocks and regional implications for the tectonic evolution of the Archaean Nain Province, Labrador." Canadian Journal of Earth Sciences 29, no. 2 (1992): 260–76. http://dx.doi.org/10.1139/e92-024.

Full text

Abstract:

Detrital zircons and their postdepositional overgrowths from three units of the "Upernavik" supracrustal association in the northern (Saglek) block of the Archaean Nain Province have been dated with the ion microprobe SHRIMP. In one unit, from the granulite-facies area in inner Saglek Fiord, the zircon population is dominated by early Archaean grains thought to be derived from the Uivak gneisses. Recrystallization and growth of new zircon within this metasediment took place during granulite-facies metamorphism at 2761 ± 12 Ma (2σ), which is also a younger limit on the age of deposition.In a se

APA, Harvard, Vancouver, ISO, and other styles

47

Janardhan, A. S., N. Shadakshara Swamy, and R. Capdevila. "Trace and REE Geochemistry of Pelites from the Sargur High-Grade Terrain, Southern Karnataka." Journal Geological Society of India 36, no. 1 (1990): 27–35. http://dx.doi.org/10.17491/jgsi/1990/360103.

Full text

Abstract:

Abstract Metapelites form one of the important supracrustal lithounits of the quartzite-pelite-carbonate association in the Sargur high-grade terrain of Southern Karnataka. These pelites have low ferromagnesium trace elemental concentrations, common to the pelites of the Archaean high-grade terrains elsewhere. Though concentration of Sc and U are comparable with the Archaean rocks, the Th concentration and majority of the trace and rare earth elemental ratios are more akin to post-Archaean levels. The REE pattern indicates a mixed provenance dominated by acid igneous rocks. Significant variabi

APA, Harvard, Vancouver, ISO, and other styles

48

Zhu, Yu-Sheng, Jin-Hui Yang, Hao Wang, and Fu-Yuan Wu. "A Palaeoproterozoic basement beneath the Rangnim Massif revealed by the in situ U–Pb ages and Hf isotopes of xenocrystic zircons from Triassic kimberlites of North Korea." Geological Magazine 156, no. 10 (2019): 1657–67. http://dx.doi.org/10.1017/s0016756818000900.

Full text

Abstract:

AbstractIn situ U–Pb and Hf analyses were used for crustal zircon xenocrysts from Triassic kimberlites exposed in the Rangnim Massif of North Korea to identify components of the basement hidden in the deep crust of the Rangnim Massif and to clarify the crustal evolution of the massif. The U–Pb age spectrum of the zircons has a prominent population at 1.9–1.8 Ga and a lack of Archaean ages. The data indicate that the deep crust and basement beneath the Rangnim Massif are predominantly of Palaeoproterozoic age, consistent with the ages of widely exposed Palaeoproterozoic granitic rocks. In situ

APA, Harvard, Vancouver, ISO, and other styles

49

Wilks, M. E., and E. G. Nisbet. "Stratigraphy of the Steep Rock Group, northwest Ontario: a major Archaean unconformity and Archaean stromatolites." Canadian Journal of Earth Sciences 25, no. 3 (1988): 370–91. http://dx.doi.org/10.1139/e88-040.

Full text

Abstract:

The Archaean Steep Rock Group of northwest Ontario, situated in the Wabigoon Subprovince of the Superior Province, Canada, comprises five formations: Wagita Formation (clastics), Mosher Carbonate, Jolliffe Ore Zone, Dismal Ashrock, and Witch Bay Formation (metavolcanics). Reinvestigation of the geology of the group has shown that the basal clastics of the Wagita Formation (0–150 m) unconformably overlie the Marmion Complex (a massive tonalite – tonalite gneiss terrane, 3 Ga old). Overlying the basal elastics is the Mosher Carbonate (0–500 m), containing diverse stromatolite morphologies. Exten

APA, Harvard, Vancouver, ISO, and other styles

50

Kalsbeek, Feiko, and Hubert P. Zeck. "Dykes and deformation in the Ikertoq zone of the Nagssugtoqidian at S0ndre Str0mfjord Airport, West Greenland - a discussion." Bulletin of the Geological Society of Denmark 34 (December 20, 1985): 213–17. http://dx.doi.org/10.37570/bgsd-1985-34-17.

Full text

Abstract:

Rb-Sr isotope evidence indicates that deformation in the border zone between the Archaean craton and the Nagssugtoqidian mobile belt in West Greenland took place both during the late Archaean (at ea. 2600 Ma) and during the Proterozoic Nagssugtoqidian orogeny (1850-1600 Ma). The structure (fabric) of the rocks is the combined effect of these two episodes of deformation.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!