Magnesium and Uranium isotope composition of the Sturtian Jacoca Formation cap dolomite, Brazil Article Swipe
Rolando E. Clavijo Arcos
,
Matthew O Clarkson
,
Derek Vance
,
Alcídes N. Sial
,
Marius Müller
,
Netta Shalev
·
YOU?
·
· 2021
· Open Access
·
· DOI: https://doi.org/10.7185/gold2021.4210
YOU?
·
· 2021
· Open Access
·
· DOI: https://doi.org/10.7185/gold2021.4210
The Early Cryogenian period is marked by the Sturtian glaciation episode (ca.720-660 Ma) that triggered a global perturbation to ocean chemistry and to the surface cycles of many elements.However, reconstructing variations in seawater chemistry during the Early Cryogenian remains a challenge.The magnesium and uranium isotope composition of seawater (δ 26 Mg and δ 238 U) have recently been shown to be good tools to reconstruct key Earth-surface processes, such as weathering rates, carbonate precipitation, and seawater anoxia.Dolomite has been suggested as a promising archive for δ 26 Mg and δ 238 U values of past seawater, but the fact that, in many cases, dolomite forms in sediment-buffered conditions complicates the interpretation of its isotopic signature.Here, we study the Sturtian Jacoca Formation cap dolomite member (~ 1.5 m-thickness), underlain by the Jacarecica Formation diamictite.The goals of this study are: (1) to identify the factors determining the δ 26 Mg and δ 238 U values of this cap dolomite; and (2) to assess if these isotope values can be used to reconstruct the δ 26 Mg and δ 238 U of Early Cryogenian seawater.To this end, we measure Mg and U isotope compositions of dolomites sampled from 3 profiles (ca. 1 m apart), as well as different generations of dolomite within single samples.These measurements are supplemented by chemical composition, mineralogical (XRD), and petrographic analyses.The samples exhibit a narrow range of Mg/Ca molar ratios (0.84 -1.04), which along with XRD and petrographic analysis, indicate a dolomite-dominated carbonate mineralogy.The δ 26 Mg values of the cap dolomite samples range between -1.77‰ and -0.91‰.Through the basal 6 cm above the contact with the underlying diamictite, the δ 26 Mg increases from -1.66‰to -0.91‰.This may suggest a local 26 Mg-enrichment within the precipitating solution.Above this, the δ 26 Mg value decreases back to ~ -1.7‰ and remains similar up to the highest sample taken (100 cm).This may suggest that the system was more seawater-buffered for the upper part of the unit relative to the basal part.Such seawater-buffered dolomite δ 26 Mg may be used for reconstructing Early Cryogenian seawater δ 26 Mg.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.7185/gold2021.4210
- https://goldschmidtabstracts.info/2021/4210.pdf
- OA Status
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- OpenAlex ID
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All OpenAlex metadata
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https://doi.org/10.7185/gold2021.4210Digital Object Identifier
- Title
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Magnesium and Uranium isotope composition of the Sturtian Jacoca Formation cap dolomite, BrazilWork title
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articleOpenAlex work type
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enPrimary language
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2021Year of publication
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2021-01-01Full publication date if available
- Authors
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Rolando E. Clavijo Arcos, Matthew O Clarkson, Derek Vance, Alcídes N. Sial, Marius Müller, Netta ShalevList of authors in order
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https://doi.org/10.7185/gold2021.4210Publisher landing page
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YesWhether a free full text is available
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bronzeOpen access status per OpenAlex
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https://goldschmidtabstracts.info/2021/4210.pdfDirect OA link when available
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Dolomite, Magnesium, Isotope, Uranium, Composition (language), Geochemistry, Chemistry, Geology, Physics, Materials science, Metallurgy, Nuclear physics, Philosophy, Linguistics, Organic chemistryTop concepts (fields/topics) attached by OpenAlex
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| abstract_inverted_index.a | 15, 39, 81, 224, 241, 280 |
| abstract_inverted_index.m | 199 |
| abstract_inverted_index.~ | 297 |
| abstract_inverted_index.(~ | 124 |
| abstract_inverted_index.26 | 49, 86, 146, 172, 246, 272, 282, 291, 333, 344 |
| abstract_inverted_index.Mg | 50, 87, 147, 173, 186, 247, 273, 292, 334 |
| abstract_inverted_index.U) | 54 |
| abstract_inverted_index.as | 69, 80, 201, 203 |
| abstract_inverted_index.be | 60, 166, 336 |
| abstract_inverted_index.by | 6, 128, 214 |
| abstract_inverted_index.cm | 262 |
| abstract_inverted_index.if | 161 |
| abstract_inverted_index.in | 31, 100, 105 |
| abstract_inverted_index.is | 4 |
| abstract_inverted_index.of | 26, 46, 93, 111, 134, 153, 178, 191, 206, 227, 249, 322 |
| abstract_inverted_index.to | 18, 22, 59, 63, 139, 159, 168, 296, 303, 326 |
| abstract_inverted_index.up | 302 |
| abstract_inverted_index.we | 115, 184 |
| abstract_inverted_index.δ | 52, 85, 89, 145, 149, 171, 175, 245, 271, 290, 332, 343 |
| abstract_inverted_index.(1) | 138 |
| abstract_inverted_index.(2) | 158 |
| abstract_inverted_index.(δ | 48 |
| abstract_inverted_index.1.5 | 125 |
| abstract_inverted_index.238 | 53, 90, 150, 176 |
| abstract_inverted_index.Ma) | 12 |
| abstract_inverted_index.Mg. | 345 |
| abstract_inverted_index.The | 0 |
| abstract_inverted_index.XRD | 236 |
| abstract_inverted_index.and | 21, 42, 51, 74, 88, 148, 157, 174, 187, 219, 237, 257, 299 |
| abstract_inverted_index.are | 212 |
| abstract_inverted_index.but | 96 |
| abstract_inverted_index.can | 165 |
| abstract_inverted_index.cap | 121, 155, 251 |
| abstract_inverted_index.for | 84, 318, 338 |
| abstract_inverted_index.has | 77 |
| abstract_inverted_index.its | 112 |
| abstract_inverted_index.key | 65 |
| abstract_inverted_index.may | 278, 310, 335 |
| abstract_inverted_index.the | 7, 23, 35, 97, 109, 117, 129, 141, 144, 170, 250, 259, 264, 267, 270, 285, 289, 304, 313, 319, 323, 327 |
| abstract_inverted_index.was | 315 |
| abstract_inverted_index.(100 | 308 |
| abstract_inverted_index.(ca. | 197 |
| abstract_inverted_index.are: | 137 |
| abstract_inverted_index.back | 295 |
| abstract_inverted_index.been | 57, 78 |
| abstract_inverted_index.end, | 183 |
| abstract_inverted_index.fact | 98 |
| abstract_inverted_index.from | 194, 275 |
| abstract_inverted_index.good | 61 |
| abstract_inverted_index.have | 55 |
| abstract_inverted_index.many | 27, 101 |
| abstract_inverted_index.more | 316 |
| abstract_inverted_index.part | 321 |
| abstract_inverted_index.past | 94 |
| abstract_inverted_index.such | 68 |
| abstract_inverted_index.that | 13, 312 |
| abstract_inverted_index.this | 135, 154, 182 |
| abstract_inverted_index.unit | 324 |
| abstract_inverted_index.used | 167, 337 |
| abstract_inverted_index.well | 202 |
| abstract_inverted_index.with | 235, 266 |
| abstract_inverted_index.(0.84 | 231 |
| abstract_inverted_index.Early | 1, 36, 179, 340 |
| abstract_inverted_index.Mg/Ca | 228 |
| abstract_inverted_index.above | 263 |
| abstract_inverted_index.along | 234 |
| abstract_inverted_index.basal | 260, 328 |
| abstract_inverted_index.forms | 104 |
| abstract_inverted_index.goals | 133 |
| abstract_inverted_index.local | 281 |
| abstract_inverted_index.molar | 229 |
| abstract_inverted_index.ocean | 19 |
| abstract_inverted_index.range | 226, 254 |
| abstract_inverted_index.shown | 58 |
| abstract_inverted_index.study | 116, 136 |
| abstract_inverted_index.taken | 307 |
| abstract_inverted_index.that, | 99 |
| abstract_inverted_index.these | 162 |
| abstract_inverted_index.this, | 288 |
| abstract_inverted_index.tools | 62 |
| abstract_inverted_index.upper | 320 |
| abstract_inverted_index.value | 293 |
| abstract_inverted_index.which | 233 |
| abstract_inverted_index.(XRD), | 218 |
| abstract_inverted_index.Jacoca | 119 |
| abstract_inverted_index.assess | 160 |
| abstract_inverted_index.cases, | 102 |
| abstract_inverted_index.cycles | 25 |
| abstract_inverted_index.during | 34 |
| abstract_inverted_index.global | 16 |
| abstract_inverted_index.marked | 5 |
| abstract_inverted_index.member | 123 |
| abstract_inverted_index.narrow | 225 |
| abstract_inverted_index.period | 3 |
| abstract_inverted_index.rates, | 71 |
| abstract_inverted_index.ratios | 230 |
| abstract_inverted_index.sample | 306 |
| abstract_inverted_index.single | 209 |
| abstract_inverted_index.system | 314 |
| abstract_inverted_index.values | 92, 152, 164, 248 |
| abstract_inverted_index.within | 208, 284 |
| abstract_inverted_index.-1.04), | 232 |
| abstract_inverted_index.-1.7‰ | 298 |
| abstract_inverted_index.apart), | 200 |
| abstract_inverted_index.archive | 83 |
| abstract_inverted_index.between | 255 |
| abstract_inverted_index.contact | 265 |
| abstract_inverted_index.episode | 10 |
| abstract_inverted_index.exhibit | 223 |
| abstract_inverted_index.factors | 142 |
| abstract_inverted_index.highest | 305 |
| abstract_inverted_index.isotope | 44, 163, 189 |
| abstract_inverted_index.measure | 185 |
| abstract_inverted_index.remains | 38, 300 |
| abstract_inverted_index.sampled | 193 |
| abstract_inverted_index.samples | 222, 253 |
| abstract_inverted_index.similar | 301 |
| abstract_inverted_index.suggest | 279, 311 |
| abstract_inverted_index.surface | 24 |
| abstract_inverted_index.uranium | 43 |
| abstract_inverted_index.-1.77‰ | 256 |
| abstract_inverted_index.Sturtian | 8, 118 |
| abstract_inverted_index.chemical | 215 |
| abstract_inverted_index.cm).This | 309 |
| abstract_inverted_index.dolomite | 103, 122, 207, 252, 331 |
| abstract_inverted_index.identify | 140 |
| abstract_inverted_index.indicate | 240 |
| abstract_inverted_index.isotopic | 113 |
| abstract_inverted_index.profiles | 196 |
| abstract_inverted_index.recently | 56 |
| abstract_inverted_index.relative | 325 |
| abstract_inverted_index.seawater | 32, 47, 75, 342 |
| abstract_inverted_index.Formation | 120, 131 |
| abstract_inverted_index.analysis, | 239 |
| abstract_inverted_index.carbonate | 72, 243 |
| abstract_inverted_index.chemistry | 20, 33 |
| abstract_inverted_index.decreases | 294 |
| abstract_inverted_index.different | 204 |
| abstract_inverted_index.dolomite; | 156 |
| abstract_inverted_index.dolomites | 192 |
| abstract_inverted_index.increases | 274 |
| abstract_inverted_index.magnesium | 41 |
| abstract_inverted_index.part.Such | 329 |
| abstract_inverted_index.promising | 82 |
| abstract_inverted_index.seawater, | 95 |
| abstract_inverted_index.suggested | 79 |
| abstract_inverted_index.triggered | 14 |
| abstract_inverted_index.underlain | 127 |
| abstract_inverted_index.-1.66‰to | 276 |
| abstract_inverted_index.Cryogenian | 2, 37, 180, 341 |
| abstract_inverted_index.Jacarecica | 130 |
| abstract_inverted_index.conditions | 107 |
| abstract_inverted_index.glaciation | 9 |
| abstract_inverted_index.processes, | 67 |
| abstract_inverted_index.underlying | 268 |
| abstract_inverted_index.variations | 30 |
| abstract_inverted_index.weathering | 70 |
| abstract_inverted_index.(ca.720-660 | 11 |
| abstract_inverted_index.complicates | 108 |
| abstract_inverted_index.composition | 45 |
| abstract_inverted_index.determining | 143 |
| abstract_inverted_index.diamictite, | 269 |
| abstract_inverted_index.generations | 205 |
| abstract_inverted_index.reconstruct | 64, 169 |
| abstract_inverted_index.seawater.To | 181 |
| abstract_inverted_index.analyses.The | 221 |
| abstract_inverted_index.composition, | 216 |
| abstract_inverted_index.compositions | 190 |
| abstract_inverted_index.measurements | 211 |
| abstract_inverted_index.perturbation | 17 |
| abstract_inverted_index.petrographic | 220, 238 |
| abstract_inverted_index.supplemented | 213 |
| abstract_inverted_index.-0.91‰.This | 277 |
| abstract_inverted_index.Earth-surface | 66 |
| abstract_inverted_index.Mg-enrichment | 283 |
| abstract_inverted_index.challenge.The | 40 |
| abstract_inverted_index.m-thickness), | 126 |
| abstract_inverted_index.mineralogical | 217 |
| abstract_inverted_index.precipitating | 286 |
| abstract_inverted_index.samples.These | 210 |
| abstract_inverted_index.diamictite.The | 132 |
| abstract_inverted_index.interpretation | 110 |
| abstract_inverted_index.mineralogy.The | 244 |
| abstract_inverted_index.precipitation, | 73 |
| abstract_inverted_index.reconstructing | 29, 339 |
| abstract_inverted_index.solution.Above | 287 |
| abstract_inverted_index.anoxia.Dolomite | 76 |
| abstract_inverted_index.signature.Here, | 114 |
| abstract_inverted_index.-0.91‰.Through | 258 |
| abstract_inverted_index.elements.However, | 28 |
| abstract_inverted_index.seawater-buffered | 317, 330 |
| abstract_inverted_index.sediment-buffered | 106 |
| abstract_inverted_index.dolomite-dominated | 242 |
| cited_by_percentile_year | |
| countries_distinct_count | 2 |
| institutions_distinct_count | 6 |
| citation_normalized_percentile.value | 0.0448202 |
| citation_normalized_percentile.is_in_top_1_percent | False |
| citation_normalized_percentile.is_in_top_10_percent | False |