uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Distribution of diagenetic alterations in fluvial and paralic deposits within sequence stratigraphic framework: Evidence from the Petrohan Terrigenous Group and the Svidol Formation, Lower Triassic, NW Bulgaria
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
Show others and affiliations
2006 (English)In: Sedimentary Geology, ISSN 0037-0738, E-ISSN 1879-0968, Vol. 190, no 1-4, 299-321 p.Article in journal (Refereed) Published
Abstract [en]

Elucidation of diagenetic alterations in the Petrohan Terrigenous Group (fluvial; highstand systems tract HST) sandstones and Svidol Formation (tide-dominated deltaic and tidal flat, transgressive systems tract TST and highstand systems tract HST, respectively) sandstones and calcarenite, Lower Triassic, NW Bulgaria was constrained within a sequence stratigraphic framework. Eogenetic alterations in the fluvial HST sandstones include (i) formation of grain-coating infiltrated clays as a result of percolation of mud-rich surface waters into underlying coarse-grained and permeable channel-fills and crevasse splay sandstones; (ii) formation of pseudomatrix by mechanical compaction of mud intraclasts that were incorporated into the coarse-grained channel sandstones during their lateral avulsion; and (iii) cementation by calcite (delta O-18(VPDB)=-6.5 parts per thousand to -3 parts per thousand; delta C-13(VPDB) =-5.1 parts per thousand to +0.6 parts per thousand) and dolomite (delta O-18(VPDB)=-6.1 parts per thousand to -0.3 parts per thousand 0; 81 3 CVPDB=-7.2 parts per thousand to -5.8 parts per thousand) in the crevasse splay and floodplain sediments. Mesogenetic alterations that are encountered in the fluvial HST sandstones include (i) illitization of grain-coating clays, mud intraclasts, and mica, possibly because of simultaneous albitization of feldspars; (ii) cementation by calcite (delta O-18(VPDB) = - 14.5 parts per thousand to - 8.4 parts per thousand; delta C-13(VPDB)=-7.7 parts per thousand to +0.6 parts per thousand) and dolomite (delta O-18(VPDB)=- 15.8 parts per thousand to -5 parts per thousand; delta C-13(VPDB)= - 7.9 parts per thousand to + 1.5 parts per thousand); and (iii) limited amounts of quartz overgrowths in the channel sandstones owing to occurrence of thick grain-coating clays.

Conversely, the tide-dominated deltaic TST sandstones and the tidal flat HST calcarenite were pervasively cemented by calcite (delta O-18(VPDB)=-6.6 parts per thousand to -3.1 parts per thousand; delta C-13(VPDB)=-5.1 parts per thousand to +0.6 parts per thousand) and siderite (delta O-18(VPDB)=-7.2 parts per thousand to -5.7 parts per thousand; delta C-13(VPDB) =+0.3 parts per thousand to +0.9 parts per thousand) particularly below marine and maximum flooding surfaces, due to the presence of abundant bioclasts and prolonged residence time of the sediments under certain geochemical conditions along these surfaces. The remaining open pores were cemented during mesodiagenesis by calcite (delta O-18(VPDB)=-6.6 parts per thousand to -3.1 parts per thousand and delta C-13(VPDB)=-5.1 parts per thousand to +0.6 parts per thousand) and dolomite (delta O-18(VPDB))13=-6.6 parts per thousand to -3.1 parts per thousand. and delta C-13(VPCB)=-5.1 parts per thousand to +0.6 parts per thousand).

This study shows that constructing a conceptual model for the distribution of diagenetic alterations is possible by integration of diagenesis with sequence stratigraphy. The model shows that tide-dominated deltaic TST sandstones and tidal flat HST calcarenite were pervasively cemented by carbonates during near-surface codiagenesis, owing to the presence of abundant bioclasts. Conversely, fluvial LST sandstones remained poorly cemented during near-surface eodiagenesis due to the lack of bioclasts, but were cemented by mesogenetic calcite, dolomite and quartz overgrowths instead.

Place, publisher, year, edition, pages
2006. Vol. 190, no 1-4, 299-321 p.
Keyword [en]
sequence stratigraphy and depositional facies, sandstone and calcarenite diagenesis, Lower Triassic, NW Bulgaria
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-93826DOI: 10.1016/j.sedgeo.2006.05.021ISI: 000239749900018OAI: oai:DiVA.org:uu-93826DiVA: diva2:167427
Available from: 2005-11-22 Created: 2005-11-22 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Diagenesis and Sequence Stratigraphy: Predictive Models for Reservoir Quality Evolution of Fluvial and Glaciogenic and Non-glaciogenic, Paralic Deposits
Open this publication in new window or tab >>Diagenesis and Sequence Stratigraphy: Predictive Models for Reservoir Quality Evolution of Fluvial and Glaciogenic and Non-glaciogenic, Paralic Deposits
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Development of a predictive model for the distribution of diagenetic alterations and related evolution of reservoir quality of sandstones was achieved by integrating the knowledge of diagenesis to sequence stratigraphy. This approach allows a better elucidation of the distribution of eogenetic alterations within sequence stratigraphy, because changes in the relative sea level induce changes to: (i) pore water chemistry, (ii) residence time of sediments under certain near-surface geochemical conditions, (iii) variations in the detrital composition, and (iv) amounts and type of organic matter.

This thesis revealed that eogenetic alterations, which are linked to sequence stratigraphy and have an impact on reservoir quality evolution, include formation of: (i) pseudomatrix and mechanically infiltrated clays in fluvial sandstones of the lowstand and highstand systems tracts (LST and HST, respectively), (ii) kaolinite in tide-dominated deltaic and foreshore-shoreface sandstones of HST, Gilbert-type deltaic sandstones of LST and fluvial deltaic sandstones of LST, (iii) kaolinite and mechanically infiltrated clays in sandstones lying below sequence boundary, (iv) K-feldspar overgrowths in fluvial deltaic LST, (v) glaucony towards the top of fluvial deltaic LST immediately below and at transgressive surface (TS) and in foreshore and shoreface transgressive systems tracts (TST) below parasequence boundaries (PB) and maximum flooding surface (MFS), (vi) framboidal pyrite and extensive cementation by calcite and dolomite in foreshore and shoreface and tide-dominated deltaic TST, and shoreface and tidal flat HST bioclastic-rich arenites particularly in the vicinity of PB, TS and MFS, (vii) pervasive cementation by iron oxide in shoreface-offshore and shoreface sandstones of TST immediately below the MFS, (viii) zeolites and palygroskite in shoreface sandstones of TST and HST, particularly above PB, and (ix) cementation by siderite in Gilbert-type deltaic sandstones of LST, tide-dominated deltaic and foreshore-shoreface sandstones of HST and in tide-dominated deltaic sandstones of TST, particularly at MFS. Moreover, this thesis revealed that the distribution of eogenetic alterations strongly control, and thus provide information for constraining the distribution patterns of mesogenetic alterations, such as illitization of mechanically infiltrated clays and dickitization of kaolinite, and hence of related reservoir quality evolution of sandstones during progressive burial.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2005. 65 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 127
Keyword
Earth sciences, Siliciclastic diagenesis, Sequence stratigraphy, Glacial and non-glacial, Fluvial, Paralic and shallow marine, Geovetenskap
National Category
Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-6179 (URN)91-554-6415-7 (ISBN)
Public defence
2005-12-12, Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 10:15
Opponent
Supervisors
Available from: 2005-11-22 Created: 2005-11-22 Last updated: 2013-05-15Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text
By organisation
Department of Earth Sciences
In the same journal
Sedimentary Geology
Earth and Related Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 632 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf