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On the enigmatic mi...
On the enigmatic mid-Proterozoic: Single-lid versus plate tectonics
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- Roberts, Nick M.W. (author)
- British Geological Survey
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- Salminen, Johanna (author)
- University of Helsinki and Geological Survey of Finland
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- Johansson, Åke (author)
- Naturhistoriska riksmuseet,Enheten för geovetenskap
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- Mitchell, Ross N. (author)
- Institute of Geology and Geophysics, Chinese Academy of Sciences
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- Palin, Richard M. (author)
- University of Oxford
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- Condie, Kent C. (author)
- New Mexico Institute of Mining and Technology
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- Spencer, Christopher J. (author)
- Queen's University, Ontario
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(creator_code:org_t)
- Elsevier, 2022
- 2022
- English.
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In: Earth and Planetary Science Letters. - : Elsevier. - 0012-821X .- 1385-013X. ; 594, s. 1-12
- Related links:
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https://doi.org/10.1...
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Abstract
Subject headings
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- The mid-Proterozoic (ca. 1850–850 Ma) is a peculiar period of Earth history in many respects: ophiolites and passive margins of this age are rare, whereas anorthosite and A-type granite suites are abundant; metamorphic rocks typically record high thermobaric (temperature/pressure) ratios, whereas ultrahigh pressure (UHP) rocks are rare; and the abundance of economic mineral deposits features rare porphyry Cu-Au and abundant Ni-Cu and Fe-oxide Cu-Ag (IOCG) deposit types. These collective observations have been used to propose that a stagnant-lid, or single-lid, tectonic regime operated at this time, between periods of plate tectonics in the Paleoproterozoic and Neoproterozoic. In our reappraisal of the mid-Proterozoic geological record, we not only assess the viability of the single-lid hypothesis for each line of evidence, but also that of the plate tectonic alternative. We find that evidence for the single-lid hypothesis is equivocal in all cases, whereas for plate tectonics the evidence is equivocal or supporting.We therefore find no reason to abandon a plate tectonic model for the mid-Proterozoic time period. Instead, we propose that the peculiarities of this enigmatic interval can be reconciled through the combination of two processes working in tandem: secular mantle cooling and the exceptionally long tenure and incomplete breakup of Earth’s first supercontinent, where both of these phenomena had a dramatic effect on lithospheric behaviour and its resulting imprint in the geological record
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Keyword
- Mid-Proterozoic
- Plate tectonics
- Single-lid tectonics
- Secular mantle cooling
- Earth evolution
- Metamorphic record
- The changing Earth
- Den föränderliga jorden
Publication and Content Type
- ref (subject category)
- art (subject category)
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