Oncolites from lacustrine sediments in the Cretaceous of north‐eastern Spain

TOM FREEMAN; JUAN ROSELL; ANTONIO OBRADOR

doi:10.1111/j.1365-3091.1982.tb01806.x

Oncolites from lacustrine sediments in the Cretaceous of north‐eastern Spain

TOM FREEMAN, JUAN ROSELL, ANTONIO OBRADOR

Department of Geology

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

6 Citations (Scopus)

Abstract

Compact micritic oncolites up to 8 cm in maximum diameter occur within Maestrichtian (Upper Cretaceous) Garumniense continental marls of Sierra del Montsec (Lerida Province) of north‐eastern Spain. Synsedimentary development is documented by patches of terrigenous quartz that occur among oncolitic protuberances. Soluble nuclei (limestone fragments and bivalves) further suggest an origin through accretion, rather than that of soil pisolite. Similarities between the petrography and isotopic compositions of the oncolites and those of interbedded Garumniense limestones suggest similar sedimentary origins. However, these lacustrine oncolites, like modern counterparts described by others, probably developed through in situ metabolic precipitation of calcium carbonate. Evidence of this origin is their high degree of concentricity, which is unlikely to have developed through sedimentary accretion, inasmuch as the oncolites ‘float’ in quiet‐water marls. Copyright © 1982, Wiley Blackwell. All rights reserved

Original language	English
Pages (from-to)	433-436
Journal	Sedimentology
Volume	29
Issue number	3
DOIs	https://doi.org/10.1111/j.1365-3091.1982.tb01806.x
Publication status	Published - 1 Jan 1982

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@article{903359171c4c4ab6aa6f7087bc9ff3e2,

title = "Oncolites from lacustrine sediments in the Cretaceous of north‐eastern Spain",

abstract = "Compact micritic oncolites up to 8 cm in maximum diameter occur within Maestrichtian (Upper Cretaceous) Garumniense continental marls of Sierra del Montsec (Lerida Province) of north‐eastern Spain. Synsedimentary development is documented by patches of terrigenous quartz that occur among oncolitic protuberances. Soluble nuclei (limestone fragments and bivalves) further suggest an origin through accretion, rather than that of soil pisolite. Similarities between the petrography and isotopic compositions of the oncolites and those of interbedded Garumniense limestones suggest similar sedimentary origins. However, these lacustrine oncolites, like modern counterparts described by others, probably developed through in situ metabolic precipitation of calcium carbonate. Evidence of this origin is their high degree of concentricity, which is unlikely to have developed through sedimentary accretion, inasmuch as the oncolites {\textquoteleft}float{\textquoteright} in quiet‐water marls. Copyright {\textcopyright} 1982, Wiley Blackwell. All rights reserved",

author = "TOM FREEMAN and JUAN ROSELL and ANTONIO OBRADOR",

year = "1982",

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doi = "10.1111/j.1365-3091.1982.tb01806.x",

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T1 - Oncolites from lacustrine sediments in the Cretaceous of north‐eastern Spain

AU - FREEMAN, TOM

AU - ROSELL, JUAN

AU - OBRADOR, ANTONIO

PY - 1982/1/1

Y1 - 1982/1/1

N2 - Compact micritic oncolites up to 8 cm in maximum diameter occur within Maestrichtian (Upper Cretaceous) Garumniense continental marls of Sierra del Montsec (Lerida Province) of north‐eastern Spain. Synsedimentary development is documented by patches of terrigenous quartz that occur among oncolitic protuberances. Soluble nuclei (limestone fragments and bivalves) further suggest an origin through accretion, rather than that of soil pisolite. Similarities between the petrography and isotopic compositions of the oncolites and those of interbedded Garumniense limestones suggest similar sedimentary origins. However, these lacustrine oncolites, like modern counterparts described by others, probably developed through in situ metabolic precipitation of calcium carbonate. Evidence of this origin is their high degree of concentricity, which is unlikely to have developed through sedimentary accretion, inasmuch as the oncolites ‘float’ in quiet‐water marls. Copyright © 1982, Wiley Blackwell. All rights reserved

AB - Compact micritic oncolites up to 8 cm in maximum diameter occur within Maestrichtian (Upper Cretaceous) Garumniense continental marls of Sierra del Montsec (Lerida Province) of north‐eastern Spain. Synsedimentary development is documented by patches of terrigenous quartz that occur among oncolitic protuberances. Soluble nuclei (limestone fragments and bivalves) further suggest an origin through accretion, rather than that of soil pisolite. Similarities between the petrography and isotopic compositions of the oncolites and those of interbedded Garumniense limestones suggest similar sedimentary origins. However, these lacustrine oncolites, like modern counterparts described by others, probably developed through in situ metabolic precipitation of calcium carbonate. Evidence of this origin is their high degree of concentricity, which is unlikely to have developed through sedimentary accretion, inasmuch as the oncolites ‘float’ in quiet‐water marls. Copyright © 1982, Wiley Blackwell. All rights reserved

U2 - 10.1111/j.1365-3091.1982.tb01806.x

DO - 10.1111/j.1365-3091.1982.tb01806.x

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JO - Sedimentology

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