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Anatomy of intrusion related forced fold in the offshore Otway Basin, SE Australia
Magmatic sills emplaced at shallow-levels are commonly associated with bending and uplift of the overburden. Such phenomena result into domed-shaped structures, known as forced folds whose structural architecture is chiefly controlled by the geometry of underlying intrusions. Several models for host...
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Published in: | Marine and petroleum geology 2022-07, Vol.141, p.105719, Article 105719 |
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description | Magmatic sills emplaced at shallow-levels are commonly associated with bending and uplift of the overburden. Such phenomena result into domed-shaped structures, known as forced folds whose structural architecture is chiefly controlled by the geometry of underlying intrusions. Several models for host-rock deformation have been proposed and are based on elastic bending-related uplift of the associated overburden. However, the importance of inelastic compaction of overburden for accommodating intruded magma volume has remained underestimated. In this study, we document a forced fold developed above magmatic sills intruded at shallow levels into the sedimentary layers of the offshore Otway Basin, southeastern Australia, from high-quality 3D reflection seismic data. The intruded sills S1 and S2 have an average thickness of 81 m and 223 m, and its emplacement uplifted the paleo-seabed to an average amplitude of 93 m. The intruded sill S2 possess larger contribution in bending the overburden, however, the discrepancy (∼65%) between the sill thickness and vertical uplift observed at the paleo-surface, indicates the occurrence of localized host rock deformation caused by pore space collapse and fluidization of shallow buried consolidated sediments. In addition, we assume that the imaged igneous sill may include flakes of sedimentary rocks, which caused an overestimation of the sill thickness, using the widely accepted seismic velocity for mafic intrusions. Our observations imply that porosity reduction due to compaction of both proximal syn-emplacement and post-emplacement sediments, could play a vital role in accommodating this intrusion within the associated stratigraphic succession. Thus, our study provides critical insights into the compaction-related mechanism involved in overburden deformation as a result of sill intrusion.
[Display omitted]
•Identifies intrusion related forced fold in the Prawn Platform of the Otway Basin.•Provides critical insights on overburden deformation mechanism.•Interprets the structure and morphology of forced fold.•Presents an evolutionary model to elucidate forced fold development. |
doi_str_mv | 10.1016/j.marpetgeo.2022.105719 |
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[Display omitted]
•Identifies intrusion related forced fold in the Prawn Platform of the Otway Basin.•Provides critical insights on overburden deformation mechanism.•Interprets the structure and morphology of forced fold.•Presents an evolutionary model to elucidate forced fold development.</description><identifier>ISSN: 0264-8172</identifier><identifier>EISSN: 1873-4073</identifier><identifier>DOI: 10.1016/j.marpetgeo.2022.105719</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>Forced folds ; Inelastic deformation ; Magmatic sill ; Offshore SE Australia ; Otway basin</subject><ispartof>Marine and petroleum geology, 2022-07, Vol.141, p.105719, Article 105719</ispartof><rights>2022 Elsevier Ltd</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c315t-5415bfef55e0367b381b5823a07d86c1a74891da79030216048d5b0991359eb53</citedby><cites>FETCH-LOGICAL-c315t-5415bfef55e0367b381b5823a07d86c1a74891da79030216048d5b0991359eb53</cites><orcidid>0000-0001-9834-073X ; 0000-0001-8886-7511</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Kumar, Priyadarshi Chinmoy</creatorcontrib><creatorcontrib>Niyazi, Yakufu</creatorcontrib><creatorcontrib>Eruteya, Ovie Emmanuel</creatorcontrib><creatorcontrib>Moscariello, Andrea</creatorcontrib><creatorcontrib>Warne, Mark</creatorcontrib><creatorcontrib>Ierodiaconou, Daniel</creatorcontrib><creatorcontrib>Sain, Kalachand</creatorcontrib><title>Anatomy of intrusion related forced fold in the offshore Otway Basin, SE Australia</title><title>Marine and petroleum geology</title><description>Magmatic sills emplaced at shallow-levels are commonly associated with bending and uplift of the overburden. Such phenomena result into domed-shaped structures, known as forced folds whose structural architecture is chiefly controlled by the geometry of underlying intrusions. Several models for host-rock deformation have been proposed and are based on elastic bending-related uplift of the associated overburden. However, the importance of inelastic compaction of overburden for accommodating intruded magma volume has remained underestimated. In this study, we document a forced fold developed above magmatic sills intruded at shallow levels into the sedimentary layers of the offshore Otway Basin, southeastern Australia, from high-quality 3D reflection seismic data. The intruded sills S1 and S2 have an average thickness of 81 m and 223 m, and its emplacement uplifted the paleo-seabed to an average amplitude of 93 m. The intruded sill S2 possess larger contribution in bending the overburden, however, the discrepancy (∼65%) between the sill thickness and vertical uplift observed at the paleo-surface, indicates the occurrence of localized host rock deformation caused by pore space collapse and fluidization of shallow buried consolidated sediments. In addition, we assume that the imaged igneous sill may include flakes of sedimentary rocks, which caused an overestimation of the sill thickness, using the widely accepted seismic velocity for mafic intrusions. Our observations imply that porosity reduction due to compaction of both proximal syn-emplacement and post-emplacement sediments, could play a vital role in accommodating this intrusion within the associated stratigraphic succession. Thus, our study provides critical insights into the compaction-related mechanism involved in overburden deformation as a result of sill intrusion.
[Display omitted]
•Identifies intrusion related forced fold in the Prawn Platform of the Otway Basin.•Provides critical insights on overburden deformation mechanism.•Interprets the structure and morphology of forced fold.•Presents an evolutionary model to elucidate forced fold development.</description><subject>Forced folds</subject><subject>Inelastic deformation</subject><subject>Magmatic sill</subject><subject>Offshore SE Australia</subject><subject>Otway basin</subject><issn>0264-8172</issn><issn>1873-4073</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><recordid>eNqFkM1OwzAQhC0EEqXwDPgBSNmN4zg5hqr8SEiV-DlbTmJTV2lc2S6ob49LEVdOI-3ujGY_Qq4RZghY3q5nG-W3On5oN8shz9OUC6xPyAQrwbICBDslE8jLIqtQ5OfkIoQ1AIgacEJemlFFt9lTZ6gdo98F60bq9aCi7qlxvvuRoU9bGlc63Zmwcl7TZfxSe3qngh1v6OuCNrsQvRqsuiRnRg1BX_3qlLzfL97mj9nz8uFp3jxnHUMeM14gb402nGtgpWhZhS2vcqZA9FXZoRJFVWOvUk8GOZZQVD1voa6R8Vq3nE2JOOZ23oXgtZFbbxOLvUSQBzRyLf_QyAMaeUSTnM3RqVO9T6u9DJ3VY3rVet1F2Tv7b8Y3O6FwMA</recordid><startdate>202207</startdate><enddate>202207</enddate><creator>Kumar, Priyadarshi Chinmoy</creator><creator>Niyazi, Yakufu</creator><creator>Eruteya, Ovie Emmanuel</creator><creator>Moscariello, Andrea</creator><creator>Warne, Mark</creator><creator>Ierodiaconou, Daniel</creator><creator>Sain, Kalachand</creator><general>Elsevier Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><orcidid>https://orcid.org/0000-0001-9834-073X</orcidid><orcidid>https://orcid.org/0000-0001-8886-7511</orcidid></search><sort><creationdate>202207</creationdate><title>Anatomy of intrusion related forced fold in the offshore Otway Basin, SE Australia</title><author>Kumar, Priyadarshi Chinmoy ; Niyazi, Yakufu ; Eruteya, Ovie Emmanuel ; Moscariello, Andrea ; Warne, Mark ; Ierodiaconou, Daniel ; Sain, Kalachand</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c315t-5415bfef55e0367b381b5823a07d86c1a74891da79030216048d5b0991359eb53</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2022</creationdate><topic>Forced folds</topic><topic>Inelastic deformation</topic><topic>Magmatic sill</topic><topic>Offshore SE Australia</topic><topic>Otway basin</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Kumar, Priyadarshi Chinmoy</creatorcontrib><creatorcontrib>Niyazi, Yakufu</creatorcontrib><creatorcontrib>Eruteya, Ovie Emmanuel</creatorcontrib><creatorcontrib>Moscariello, Andrea</creatorcontrib><creatorcontrib>Warne, Mark</creatorcontrib><creatorcontrib>Ierodiaconou, Daniel</creatorcontrib><creatorcontrib>Sain, Kalachand</creatorcontrib><collection>CrossRef</collection><jtitle>Marine and petroleum geology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kumar, Priyadarshi Chinmoy</au><au>Niyazi, Yakufu</au><au>Eruteya, Ovie Emmanuel</au><au>Moscariello, Andrea</au><au>Warne, Mark</au><au>Ierodiaconou, Daniel</au><au>Sain, Kalachand</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Anatomy of intrusion related forced fold in the offshore Otway Basin, SE Australia</atitle><jtitle>Marine and petroleum geology</jtitle><date>2022-07</date><risdate>2022</risdate><volume>141</volume><spage>105719</spage><pages>105719-</pages><artnum>105719</artnum><issn>0264-8172</issn><eissn>1873-4073</eissn><abstract>Magmatic sills emplaced at shallow-levels are commonly associated with bending and uplift of the overburden. Such phenomena result into domed-shaped structures, known as forced folds whose structural architecture is chiefly controlled by the geometry of underlying intrusions. Several models for host-rock deformation have been proposed and are based on elastic bending-related uplift of the associated overburden. However, the importance of inelastic compaction of overburden for accommodating intruded magma volume has remained underestimated. In this study, we document a forced fold developed above magmatic sills intruded at shallow levels into the sedimentary layers of the offshore Otway Basin, southeastern Australia, from high-quality 3D reflection seismic data. The intruded sills S1 and S2 have an average thickness of 81 m and 223 m, and its emplacement uplifted the paleo-seabed to an average amplitude of 93 m. The intruded sill S2 possess larger contribution in bending the overburden, however, the discrepancy (∼65%) between the sill thickness and vertical uplift observed at the paleo-surface, indicates the occurrence of localized host rock deformation caused by pore space collapse and fluidization of shallow buried consolidated sediments. In addition, we assume that the imaged igneous sill may include flakes of sedimentary rocks, which caused an overestimation of the sill thickness, using the widely accepted seismic velocity for mafic intrusions. Our observations imply that porosity reduction due to compaction of both proximal syn-emplacement and post-emplacement sediments, could play a vital role in accommodating this intrusion within the associated stratigraphic succession. Thus, our study provides critical insights into the compaction-related mechanism involved in overburden deformation as a result of sill intrusion.
[Display omitted]
•Identifies intrusion related forced fold in the Prawn Platform of the Otway Basin.•Provides critical insights on overburden deformation mechanism.•Interprets the structure and morphology of forced fold.•Presents an evolutionary model to elucidate forced fold development.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.marpetgeo.2022.105719</doi><orcidid>https://orcid.org/0000-0001-9834-073X</orcidid><orcidid>https://orcid.org/0000-0001-8886-7511</orcidid></addata></record> |
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subjects | Forced folds Inelastic deformation Magmatic sill Offshore SE Australia Otway basin |
title | Anatomy of intrusion related forced fold in the offshore Otway Basin, SE Australia |
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