Details
| Original language | English |
|---|---|
| Article number | 107384 |
| Journal | Precambrian research |
| Volume | 406 |
| Issue number | 107384 |
| Early online date | 15 Apr 2024 |
| Publication status | Published - 15 Jun 2024 |
Abstract
Basal Ediacaran barite, which has mass-anomalous depleted 17O, supporting Snowball Earth models, likely grew in shallow-marine settings, but sedimentological constraints lack details. Environmental conditions in the Varanger Palaeovalley during the basal Ediacaran are well preserved in the Nyborg Formation, where barite forms < 15 mm high synsyn-sedimentary crystal fans on Archean basement or thin intervening sediments. Sedimentary evidence suggests crystal fans formed in low-energy, very shallow-marine to subaerial facies. Rare earth element and yttrium signatures in associated carbonates suggest non-saline growth environments. Post-depositional fluid-flow replaced crystal fan barite with silica (now quartz) and redeposited barite as: <1 × 0.2 mm “dispersed” grains in sediments below fans; <5 mm grains replacing calcite filling desiccation cracks; <1 mm grains in basement fissures; <3 µm grains replacing matrix calcite; irregular grains in detrital sheet-silicate + calcite grains. Caledonian dissolution-reprecipitation reworked barite into brittle fractures and stylolites. Barite Δ17O values are amongst the most negative (-0.9 – -1.25 ‰) and δ18O values the lowest recorded (9.9 – 16.9 ‰) anywhere, consistent with a high latitude Baltica at ∼ 635 Ma. δ34S values (17.7 – 24.5 ‰) lie within the known range for basal Ediacaran barite.
Keywords
- Marinoan, Scandinavian Caledonides, Sulfate, Sulfur isotopes, Triple-oxygen isotopes
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geology
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
Sustainable Development Goals
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In: Precambrian research, Vol. 406, No. 107384, 107384, 15.06.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Sedimentary environment of basal Ediacaran barite growth on Baltica in E. Finnmark, N. Norway, and subsequent dissolution/reprecipitation
AU - Rice, A. Hugh N.
AU - Viehmann, Sebastian
AU - Peng, Yongbo
AU - Bao, Huiming
N1 - Funding Information: We thank: the National Natural Science Foundation of China (42173001) to YP, the Charles L. Jones professorship fund, Lousiana State University, to HB for financial support; Arild and Jorunn Pettersen for hospitality during fieldwork; Christa Hofmann for field assistance in 2012; Franz Kiraly for assistance with EPMA data acquisition; Ilke W\u00FCnsche for polished thin-sections; Sabine Hruby-Nichtenberger for staining sections; Simon Hohl, Robert Riding, Rudi Pavuza, Dominik Talla, Kate\u0159ina Sch\u00F6pfer, Galen Halverson and Erich Draganits for varied discussions. Finally, we thank the two anonymous reviewers and Luke Beranek (Associate Editor) for their helpful comments on an earlier version of the paper.
PY - 2024/6/15
Y1 - 2024/6/15
N2 - Basal Ediacaran barite, which has mass-anomalous depleted 17O, supporting Snowball Earth models, likely grew in shallow-marine settings, but sedimentological constraints lack details. Environmental conditions in the Varanger Palaeovalley during the basal Ediacaran are well preserved in the Nyborg Formation, where barite forms < 15 mm high synsyn-sedimentary crystal fans on Archean basement or thin intervening sediments. Sedimentary evidence suggests crystal fans formed in low-energy, very shallow-marine to subaerial facies. Rare earth element and yttrium signatures in associated carbonates suggest non-saline growth environments. Post-depositional fluid-flow replaced crystal fan barite with silica (now quartz) and redeposited barite as: <1 × 0.2 mm “dispersed” grains in sediments below fans; <5 mm grains replacing calcite filling desiccation cracks; <1 mm grains in basement fissures; <3 µm grains replacing matrix calcite; irregular grains in detrital sheet-silicate + calcite grains. Caledonian dissolution-reprecipitation reworked barite into brittle fractures and stylolites. Barite Δ17O values are amongst the most negative (-0.9 – -1.25 ‰) and δ18O values the lowest recorded (9.9 – 16.9 ‰) anywhere, consistent with a high latitude Baltica at ∼ 635 Ma. δ34S values (17.7 – 24.5 ‰) lie within the known range for basal Ediacaran barite.
AB - Basal Ediacaran barite, which has mass-anomalous depleted 17O, supporting Snowball Earth models, likely grew in shallow-marine settings, but sedimentological constraints lack details. Environmental conditions in the Varanger Palaeovalley during the basal Ediacaran are well preserved in the Nyborg Formation, where barite forms < 15 mm high synsyn-sedimentary crystal fans on Archean basement or thin intervening sediments. Sedimentary evidence suggests crystal fans formed in low-energy, very shallow-marine to subaerial facies. Rare earth element and yttrium signatures in associated carbonates suggest non-saline growth environments. Post-depositional fluid-flow replaced crystal fan barite with silica (now quartz) and redeposited barite as: <1 × 0.2 mm “dispersed” grains in sediments below fans; <5 mm grains replacing calcite filling desiccation cracks; <1 mm grains in basement fissures; <3 µm grains replacing matrix calcite; irregular grains in detrital sheet-silicate + calcite grains. Caledonian dissolution-reprecipitation reworked barite into brittle fractures and stylolites. Barite Δ17O values are amongst the most negative (-0.9 – -1.25 ‰) and δ18O values the lowest recorded (9.9 – 16.9 ‰) anywhere, consistent with a high latitude Baltica at ∼ 635 Ma. δ34S values (17.7 – 24.5 ‰) lie within the known range for basal Ediacaran barite.
KW - Marinoan
KW - Scandinavian Caledonides
KW - Sulfate
KW - Sulfur isotopes
KW - Triple-oxygen isotopes
UR - http://www.scopus.com/inward/record.url?scp=85190353906&partnerID=8YFLogxK
U2 - 10.1016/j.precamres.2024.107384
DO - 10.1016/j.precamres.2024.107384
M3 - Article
AN - SCOPUS:85190353906
VL - 406
JO - Precambrian research
JF - Precambrian research
SN - 0301-9268
IS - 107384
M1 - 107384
ER -