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On the enigmatic mid-Proterozoic: Single-lid versus plate tectonics
British Geological Survey.ORCID iD: 0000-0001-8272-5432
University of Helsinki and Geological Survey of Finland.
Swedish Museum of Natural History, Department of Geology.ORCID iD: 0000-0002-1598-5231
Institute of Geology and Geophysics, Chinese Academy of Sciences.
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2022 (English)In: Earth and Planetary Science Letters, ISSN 0012-821X, E-ISSN 1385-013X, Vol. 594, p. 1-12, article id 117749Article in journal (Refereed) Published
Abstract [en]

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

Place, publisher, year, edition, pages
Elsevier, 2022. Vol. 594, p. 1-12, article id 117749
Keywords [en]
Mid-Proterozoic, Plate tectonics, Single-lid tectonics, Secular mantle cooling, Earth evolution, Metamorphic record
National Category
Geology
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-4781DOI: 10.1016/j.epsl.2022.117749OAI: oai:DiVA.org:nrm-4781DiVA, id: diva2:1686010
Available from: 2022-08-08 Created: 2022-08-08 Last updated: 2022-08-11Bibliographically approved

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Publisher's full texthttps://www.sciencedirect.com/science/article/pii/S0012821X22003855

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