Continent formation through time

Kranendonk, Martin J. Van; Parman, S. W.; Clift, Peter D.

doi:10.1144/sp389.13

Cited by 30 publications

(13 citation statements)

References 136 publications

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“…The tectonic environments and geodynamic processes responsible for the stabilization of Earth's first continental nuclei have long been—and remain—a topic of heated debate (e.g. Bédard, ; Brown & Johnson, ; Foley, Buhre, & Jacob, ; Hamilton, ; Hawkesworth et al., ; Johnson et al., ; Palin, White, & Green, ; Roberts, Van Kranendonk, Parman, & Clift, ).…”

Section: Discussionmentioning

confidence: 99%

New constraints on granulite facies metamorphism and melt production in the Lewisian Complex, northwest Scotland

Feisel

White

Palin

et al. 2018

Journal Metamorphic Geology

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In this study, we investigate the metamorphic history of the Assynt and Gruinard blocks of the Archean Lewisian Complex, northwest Scotland, which are considered by some to represent discrete crustal terranes. For samples of mafic and intermediate rocks, phase diagrams were constructed in the Na2O–CaO–K2O–FeO–MgO–Al2O3–SiO2–H2O–TiO2–O2 (NCKFMASHTO) system using whole‐rock compositions. Our results indicate that all samples equilibrated at similar peak metamorphic conditions of ~8–10 kbar and ~900–1,000°C, consistent with field evidence for in situ partial melting and the classic interpretation of the central region of the Lewisian Complex as representing a single crustal block. Melt‐reintegration modelling was employed in order to estimate probable protolith compositions. Phase equilibria calculated for these modelled undepleted precursors match well with those determined for a subsolidus amphibolite from Gairloch in the southern region of the Lewisian Complex. Both subsolidus lithologies exhibit similar phase relations and potential melt fertility, with both expected to produce orthopyroxene‐bearing hornblende granulites, with or without garnet, at the conditions inferred for the Badcallian metamorphic peak. For fully hydrated protoliths, prograde melting is predicted to first occur at ~620°C and ~9.5 kbar, with up to 45% partial melt predicted to form at peak conditions in a closed‐system environment. Partial melts calculated for both compositions between 610 and 1,050°C are mostly trondhjemitic. Although the melt‐reintegrated granulite is predicted to produce more potassic (granitic) melts at ~700–900°C, the modelled melts are consistent with the measured compositions of felsic sheets from the central region Lewisian Complex.

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Section: Discussionmentioning

confidence: 99%

New constraints on granulite facies metamorphism and melt production in the Lewisian Complex, northwest Scotland

Feisel

White

Palin

et al. 2018

Journal Metamorphic Geology

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“…1a, Herzberg et al, 2010), it is now commonly accepted that limitations to this approach will exist. For example, crust-forming processes in the Hadean are generally thought to be quite different to those of today (see Roberts et al, 2015;Kamber, 2015). A question underlying this special issue is therefore how does Mesoproterozoic orogenesis compare to that of the Phanerozoic?…”

Section: Uniformitarianismmentioning

confidence: 99%

The structural, metamorphic and magmatic evolution of Mesoproterozoic orogens

Slagstad

Viola

2015

Precambrian Research

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“…At the local scale, there is geological evidence that extensive volcanism produced land masses resembling Hawaii and Iceland today [4]. When these emerged from the global ocean, precipitation produced the equivalent of distilled water that accumulated on the volcanic land forms as geysers, hot springs and pools.…”

Section: Introductionmentioning

confidence: 99%

The Role of Lipid Membranes in Life’s Origin

Deamer

2017

Life

191

154

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At some point in early evolution, life became cellular. Assuming that this step was required for the origin of life, there would necessarily be a pre-existing source of amphihilic compounds capable of assembling into membranous compartments. It is possible to make informed guesses about the properties of such compounds and the conditions most conducive to their self-assembly into boundary structures. The membranes were likely to incorporate mixtures of hydrocarbon derivatives between 10 and 20 carbons in length with carboxylate or hydroxyl head groups. Such compounds can be synthesized by chemical reactions and small amounts were almost certainly present in the prebiotic environment. Membrane assembly occurs most readily in low ionic strength solutions with minimal content of salt and divalent cations, which suggests that cellular life began in fresh water pools associated with volcanic islands rather than submarine hydrothermal vents.

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Continent formation through time

Cited by 30 publications

References 136 publications

New constraints on granulite facies metamorphism and melt production in the Lewisian Complex, northwest Scotland

New constraints on granulite facies metamorphism and melt production in the Lewisian Complex, northwest Scotland

The structural, metamorphic and magmatic evolution of Mesoproterozoic orogens

The Role of Lipid Membranes in Life’s Origin

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