Preservation of Mesoproterozoic age deep burial fluid signatures, NW Scotland

Parnell, John; Blamey, Nigel; Costanzo, Alessandra; Feely, Martin; Boyce, Adrian J.

doi:10.1016/j.marpetgeo.2013.11.018

Cited by 9 publications

(7 citation statements)

References 40 publications

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“…Vein oxygen is commonly isotopically lighter than that of the host material ( Figure 3). A notable exception is cone-in-cone calcite hosted inside Proterozoic, organic-rich shale (Parnell et al, 2013). Apart from this example, oxygen is depleted within veins, relative to the host rock, and the absence of any general correlation likely reflects the control of the local temperature on oxygen fractionation.…”

Section: Stable Isotopesmentioning

confidence: 94%

Fractures in mudrocks: Advances in constraining timing and understanding mechanisms

Hooker

Abu-Mahfouz

Meng

et al. 2019

Journal of Structural Geology

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Section: Stable Isotopesmentioning

confidence: 94%

Fractures in mudrocks: Advances in constraining timing and understanding mechanisms

Hooker

Abu-Mahfouz

Meng

et al. 2019

Journal of Structural Geology

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“…CIC structures have been found worldwide in Phanerozoic sedimentary rocks; however, they are rare in the Precambrian rock record (Cobbold et al, 2013). From the Precambrian, so far CIC calcite has been described from the Palaeoproterozoic of North America (Turner and Kamber, 2012), the Mesoproterozoic of Scotland (Parnell et al, 2014), the lower Ediacaran of the southern Canadian Cordillera (Smith, 2009), and the upper Ediacaran of Ukraine and Moldavia (Văscăutanu, 1931;Kopeliovich, 1965;Ivantsov et al, 2015;Nesterovsky et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

First record of carbonates with spherulites and cone-in-cone structures from the Precambrian of Arctic Norway, and their palaeoenvironmental significance

Meinhold

Jensen

Høyberget³

et al. 2019

Precambrian Research

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We report for the first time carbonates from the upper Ediacaran sedimentary succession of Finnmark, Arctic Norway. Carbonates occur as calcareous siliciclastic beds, lenses, and concretions, some with calcite spherulites and cone-in-cone (CIC) calcite, in a mudrock to fine-grained sandstone succession from approximately 3 m to 26 m above the base of the 2 nd cycle of the Manndrapselva Member of the Stáhpogieddi Formation (Vestertana Group). They occur c. 40 m below the Ediacaran-Cambrian boundary, which is well defined by trace fossils. Thin-section petrography and scanning micro X-ray fluorescence elemental mapping reveal a layered composition of the calcareous sedimentary rocks. In some of those, welldeveloped nested cones of CIC calcite form the outer layer. Thin clay coatings outline individual cones. The inner layers are composed of (1) carbonate with calcite spherulites (grainstone) and (2) thinly laminated fine-grained calcareous siliciclastics (mudstone and wackestone) indicated by elevated concentrations of Al, Si, Fe, and Ti. The inner siliciclastic layers contain framboidal pyrite and probably organic matter. Formation of calcite spherulites took place probably at the sediment-water interface either in a coastal littoral environment or in situ in the sublittoral zone under high alkaline conditions whereas CIC calcite formed during burial diagenesis and clearly in pre-Caledonian time before metamorphism and cleavage formation. This new record of carbonates with calcite spherulites and CIC structures from the Ediacaran of Arctic Norway adds to their rare occurrences in the geological record.

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“…The Stoer Group is dominantly siliciclastic with few carbonate rock horizons (see Stewart, 2002;Parnell et al, 2014;Stueeken et al, 2017;Brasier et al, 2017). Notably there are layered carbonate units in the Stoer Group that have been interpreted as stromatolitic (Upfold, 1984;Krabbendam, 2011;Brasier et al, 2017), and these are the only potential macrofossils visible in the field, but their biogenicity has never been convincingly proven (Stewart, 2002).…”

Section: Introductionmentioning

confidence: 99%

Detecting ancient life: Investigating the nature and origin of possible stromatolites and associated calcite from a one billion year old lake

Brasier

Dennis

Still

et al. 2019

Precambrian Research

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Putative stromatolites and associated carbonate minerals in 1.1 Ga Stoer Group lacustrine sedimentary rocks were analysed to deduce their likely origins. Potential stromatolite examples included finely laminated and sometimes wrinkled carbonate-siliciclastic rocks of the Clachtoll Formation at Clachtoll and Bay of Stoer, and laminated limestone domes of the Poll a'Mhuilt Member (Bay of Stoer Formation) from Enard Bay. Highlights • Putative stromatolites of the Mesoproterozoic Stoer Group show no evidence for biogenicity • Some are laminated clastic sediment draped over an ancient land surface • Clastic carbonate is calcite, probably derived from weathering of older rocks • Other possible stromatolites result from soft-sediment deformation • Crystalline calcite in these is a result of syn-depositional to burial diagenesis

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Preservation of Mesoproterozoic age deep burial fluid signatures, NW Scotland

Cited by 9 publications

References 40 publications

Fractures in mudrocks: Advances in constraining timing and understanding mechanisms

Fractures in mudrocks: Advances in constraining timing and understanding mechanisms

First record of carbonates with spherulites and cone-in-cone structures from the Precambrian of Arctic Norway, and their palaeoenvironmental significance

Detecting ancient life: Investigating the nature and origin of possible stromatolites and associated calcite from a one billion year old lake

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