Conditions of rhodochrosite-nodule formation in Neogene-Pleistocene deep-sea sediments: Evidence from O, C and Sr isotopes

S. Morad; I. S. Al-Aasm

doi:10.1016/S0037-0738(97)00066-3

Conditions of rhodochrosite-nodule formation in Neogene-Pleistocene deep-sea sediments: Evidence from O, C and Sr isotopes

S. Morad
, I. S. Al-Aasm

Earth Science

University of Windsor

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

Calcic rhodochrosite occurs as nodules around burrows in late Neogene - early Pleistocene pelagic sediments of the Galapagos Ridge in the Guatemala Basin, eastern equatorial Pacific (DSDP Leg 68; Site 503). Growth was accomplished in the suboxic zone (δ¹³C = -4.3‰ to -1.3‰) at an estimated depth between ≈30 and 70 cm beneath the seafloor. The rhodochrosites have ⁸⁷Sr/⁸⁶Sr ratios (0.708945-0.709073) that largely record the small-scale changes in seawater Sr-isotopic composition. The anomalous enrichment of the rhodochrosite in ¹⁸O isotopes (δ¹⁸O_PDB up to +6.4‰) is attributed to the dissociation of gas hydrates.

Original language	British English
Pages (from-to)	295-304
Number of pages	10
Journal	Sedimentary Geology
Volume	114
Issue number	1-4
DOIs	https://doi.org/10.1016/S0037-0738(97)00066-3
State	Published - Dec 1997

Keywords

Diagenesis
Gas hydrates
Isotopes
Rhodocrosite

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@article{6c3cf01265a24ef0ab7a5d986548dfa4,

title = "Conditions of rhodochrosite-nodule formation in Neogene-Pleistocene deep-sea sediments: Evidence from O, C and Sr isotopes",

abstract = "Calcic rhodochrosite occurs as nodules around burrows in late Neogene - early Pleistocene pelagic sediments of the Galapagos Ridge in the Guatemala Basin, eastern equatorial Pacific (DSDP Leg 68; Site 503). Growth was accomplished in the suboxic zone (δ13C = -4.3‰ to -1.3‰) at an estimated depth between ≈30 and 70 cm beneath the seafloor. The rhodochrosites have 87Sr/86Sr ratios (0.708945-0.709073) that largely record the small-scale changes in seawater Sr-isotopic composition. The anomalous enrichment of the rhodochrosite in 18O isotopes (δ18OPDB up to +6.4‰) is attributed to the dissociation of gas hydrates.",

keywords = "Diagenesis, Gas hydrates, Isotopes, Rhodocrosite",

author = "S. Morad and Al-Aasm, \{I. S.\}",

note = "Funding Information: We thank the Swedish Natural Science Research Council (NFR) and the Natural Sciencesa nd Engineering ResearchC ouncil of Canada (NSERC) for financial support. We thank M.R. Arthur, M. Coleman, P.K. Egeberg,H . Friis, R. MatsumotoJ,. Veiser and P. Vrolijk for useful discussionsH. owever,the authors are fully responsiblefo r the interpretations presented.",

year = "1997",

month = dec,

doi = "10.1016/S0037-0738(97)00066-3",

language = "British English",

volume = "114",

pages = "295--304",

journal = "Sedimentary Geology",

issn = "0037-0738",

publisher = "Elsevier B.V.",

number = "1-4",

}

TY - JOUR

T1 - Conditions of rhodochrosite-nodule formation in Neogene-Pleistocene deep-sea sediments

T2 - Evidence from O, C and Sr isotopes

AU - Morad, S.

AU - Al-Aasm, I. S.

N1 - Funding Information: We thank the Swedish Natural Science Research Council (NFR) and the Natural Sciencesa nd Engineering ResearchC ouncil of Canada (NSERC) for financial support. We thank M.R. Arthur, M. Coleman, P.K. Egeberg,H . Friis, R. MatsumotoJ,. Veiser and P. Vrolijk for useful discussionsH. owever,the authors are fully responsiblefo r the interpretations presented.

PY - 1997/12

Y1 - 1997/12

N2 - Calcic rhodochrosite occurs as nodules around burrows in late Neogene - early Pleistocene pelagic sediments of the Galapagos Ridge in the Guatemala Basin, eastern equatorial Pacific (DSDP Leg 68; Site 503). Growth was accomplished in the suboxic zone (δ13C = -4.3‰ to -1.3‰) at an estimated depth between ≈30 and 70 cm beneath the seafloor. The rhodochrosites have 87Sr/86Sr ratios (0.708945-0.709073) that largely record the small-scale changes in seawater Sr-isotopic composition. The anomalous enrichment of the rhodochrosite in 18O isotopes (δ18OPDB up to +6.4‰) is attributed to the dissociation of gas hydrates.

AB - Calcic rhodochrosite occurs as nodules around burrows in late Neogene - early Pleistocene pelagic sediments of the Galapagos Ridge in the Guatemala Basin, eastern equatorial Pacific (DSDP Leg 68; Site 503). Growth was accomplished in the suboxic zone (δ13C = -4.3‰ to -1.3‰) at an estimated depth between ≈30 and 70 cm beneath the seafloor. The rhodochrosites have 87Sr/86Sr ratios (0.708945-0.709073) that largely record the small-scale changes in seawater Sr-isotopic composition. The anomalous enrichment of the rhodochrosite in 18O isotopes (δ18OPDB up to +6.4‰) is attributed to the dissociation of gas hydrates.

KW - Diagenesis

KW - Gas hydrates

KW - Isotopes

KW - Rhodocrosite

UR - https://www.scopus.com/pages/publications/0031425949

U2 - 10.1016/S0037-0738(97)00066-3

DO - 10.1016/S0037-0738(97)00066-3

M3 - Article

AN - SCOPUS:0031425949

SN - 0037-0738

VL - 114

SP - 295

EP - 304

JO - Sedimentary Geology

JF - Sedimentary Geology

IS - 1-4

ER -

Conditions of rhodochrosite-nodule formation in Neogene-Pleistocene deep-sea sediments: Evidence from O, C and Sr isotopes

Abstract

Keywords

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