A revised core-seismic integration in the Molloy Basin (ODP Site 909): Implications for the history of ice rafting and ocean circulation in the Atlantic-Arctic gateway

Gruetzner, Jens; Matthießen, Jens; Geissler, Wolfram; Gebhardt, Catalina; Schreck, Michael

doi:10.1016/j.gloplacha.2022.103876

Cited by 8 publications

(7 citation statements)

References 143 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the Norwegian sea, R. actinocoronata disappeared at the transition of Subchron C3n.2n to C3n.2r (4.64 ± 0.15 Ma) (De Schepper et al 2017) but is observed near the top of the Molo Formation in the Middle Miocene (Grøsfjeld et al 2019). In the Molloy Basin, the HO of R. actinocoronata is identified with the top of Subchron C3n.2n at 4.493 Ma (Gruetzner et al 2022). Considering the global HO of R. actinocoronata in the Zanclean and the HO in the Colorado and Valdés basins (Argentina) associated with a change from open to nearshore marine conditions, Guler et al (2021) suggested an earlier environmentally controlled extinction of R. actinocoronata , related to an abrupt shallowing in the southwestern Atlantic toward the end of the Miocene.…”

Section: Resultsmentioning

confidence: 99%

Miocene dinoflagellate cyst biostratigraphy of the Península Valdés, Patagonia, Argentina

Fuentes

2023

Palynology

View full text Add to dashboard Cite

The present work documents the stratigraphic distribution of dinoflagellate cysts from the upper part (60-585 m) of the YPF.Ch. PV. es-1 borehole, Pen ınsula Vald es, Argentina. The assemblages exhibit a relatively moderate to low diversity. Most samples are characterized by frequent to abundant taxa of the order Gonyaulacales, such as Spiniferites/Achomosphaera spp., Reticulatosphaera actinocoronata, Operculodinium centrocarpum, and Melitasphaeridium choanophorum. Furthermore, a continuous succession of Early Miocene-Late Miocene diagnostic dinoflagellate cyst events was recorded for the first time from the Pen ınsula Vald es region. Eight diagnostic events of highest occurrences (HOs) of dinoflagellate cyst taxa are identified. These bioevents allowed a subdivision of the sedimentary succession into two well-defined stratigraphic sections: Early to Middle Miocene (Burdigalian-Langhian/probably Serravalian, 430/425-330/325 m) based on the HOs of Emmetrocysta urnaformis, Cannosphaeropsis quattrocchiae, Cousteaudinium auybriae, and Cleistosphaeridium ancyreum, and Late Miocene (Tortonian-Messinian, between 175-170 and 80/85 m) based on the HOs of Labyrinthodinium truncatum subsp. truncatum, Operculodinium piaseckii, and Reticulatosphaera actinocoronata. The ranges of these taxa are compared with well-documented information on Neogene dinoflagellate cysts recorded from different sites across the North and South Atlantic Ocean and adjacent seas. In general, the dinoflagellate cyst assemblages, as well as the selected diagnostic taxa, exhibit a clear similarity to those of the Northern Hemisphere. The only exception is Hystrichokolpoma rigaudiae, which is asynchronous, possibly indicating local paleoenvironmental conditions.

show abstract

Section: Resultsmentioning

confidence: 99%

Miocene dinoflagellate cyst biostratigraphy of the Península Valdés, Patagonia, Argentina

Fuentes

2023

Palynology

View full text Add to dashboard Cite

show abstract

“…The timing and modality of the opening of the Fram Strait are still largely debated (Thiede and Myhre, 1996;Jokat et al, 2008;Knies and Gaina, 2008;Backman and Moran., 2009;Poirier and Hillaire-Marcel, 2011;Ehlers and Jokat, 2013;among others). Strike-slip movement and oblique ultraslow spreading in this region linked the active ocean ridge systems in the Norwegian-Greenland Sea (to the south) and the Arctic Eurasian Basin (to the north; Gruetzner et al, 2022). The continental areas were well separated by the early Miocene, but subsidence histories of different parts of strait are poorly known.…”

Section: Geologic Settingmentioning

confidence: 94%

Expedition 403 Scientific Prospectus: Eastern Fram Strait Paleo-Archive (FRAME)

Lucchi¹,

John²,

Williams³

2023

International Ocean Discovery Program Scientific Prospectus

View full text Add to dashboard Cite

Portions of this work may have been published in whole or in part in other IODP documents or publications.This IODP Scientific Prospectus is based on precruise JOIDES Resolution Facility advisory panel discussions and scientific input from the designated Co-Chief Scientists on behalf of the drilling proponents. During the course of the cruise, actual site operations may indicate to the Co-Chief Scientists, the Expedition Project Manager/Staff Scientist, and the Operations Superintendent that it would be scientifically or operationally advantageous to amend the plan detailed in this prospectus. It should be understood that any substantial changes to the science deliverables outlined in the plan presented here are contingent upon the approval of the IODP JRSO Director and/or JOIDES Resolution Facility Board.

show abstract

“…A likely source of the ongoing gas and oil seepage in the Molloy Ridge area, on Vestnesa Ridge, and the shelf region off Prins Karls Forland could be organic-rich deposits of Middle Miocene (>16-17 Ma; Knies and Mann, 2002) or Late Miocene (>10-11 Ma; Gruetzner et al, 2022), as recovered in ODP Site 909 in the central Fram Strait, south of the Molloy Ridge. Basin modelling (with >16-17 Ma as depositional age) revealed an ongoing hydrocarbon generation potential since the Late Miocene (∼6 Ma) (Knies et al, 2018) with first seepage at the seafloor occurring during the early Pleistocene (Plaza-Faverola et al, 2015;Daszinnies et al, 2021).…”

Section: The Origin Of the Seeping Gas In Molloy Ridgementioning

confidence: 99%

“…Moreover, Blumenberg et al (2016) suggested that the early to middle Eocene source rock is in the early oil window since the Early Miocene along the northern Barents Sea continental margin. However, the kerogen type III/II derived oil seeps from the western Svalbard margin (Mattingsdal et al, 2023;Panieri et al, 2024) rather point to a deltaic/terrestrial source rock of Middle to Late Miocene age (Knies and Mann, 2002;Gruetzner et al, 2022). The potential presence of an Eocene (Azolla) source rock along the northern flank of the STF and towards the ODP sites is unlikely to be the source of the condensate oil seeping gas at Molloy Ridge due to its kerogen type II/I character of the organic matter (Stein, 2007).…”

Section: The Origin Of the Seeping Gas In Molloy Ridgementioning

confidence: 99%

Acoustic evidence of hydrocarbon release associated with the Spitsbergen Transform Fault, north of the Molloy Ridge, Fram Strait

Chand,

Knies,

Geissler

et al. 2024

Front. Earth Sci.

Self Cite

View full text Add to dashboard Cite

Hydrocarbon gases formed from biotic and abiotic processes are released through the seafloor at different locations around the world. They have been widely observed directly in video and photo data, and indirectly on echosounder data. Even though biotic gas generation is a very common process, abiotic gas generation is limited to regions where serpentinization of ultramafic rocks occur. Indications of abiotic gas occurrences are therefore sparse and much speculated upon. Here, we investigated the Spitsbergen Transform Fault, the Molloy Ridge, the Molloy Deep, and the Molloy Transform Fault/Fracture Zone, (a transform fault-bounded pull-a-part region offshore western Svalbard) where both processes may be active. Multiple acoustic gas flares, ∼1,770 and ∼3355 m high above the seafloor (tallest ever recorded), were observed indicating active migration and seepage of hydrocarbons. The proximity to the mid oceanic ridge and the documented high heat flow suggests the influence of high temperatures on organic-rich sedimentary deposits. Deep seismic data and other geological information available indicate that the main source of gas could be from thermal cracking of either pre- or syn-rift source rock organic material, potentially mixed with methane from serpentinization of mantle rocks (peridotites). Correlation with seismic stratigraphy from Ocean Drilling Program (ODP) Sites 910 and 912 on the adjacent Yermak Plateau suggests that the sedimentary source rocks may be present at the northern flank of the Molloy Ridge and within the deep graben along the Spitsbergen Transform Fault. The ∼3 km thick sedimentary succession in high heat flow zones within the transform fault and the active bounding faults allow generation and migration of hydrocarbons to the seafloor and sustains present day seepage.

show abstract

A revised core-seismic integration in the Molloy Basin (ODP Site 909): Implications for the history of ice rafting and ocean circulation in the Atlantic-Arctic gateway

Cited by 8 publications

References 143 publications

Miocene dinoflagellate cyst biostratigraphy of the Península Valdés, Patagonia, Argentina

Miocene dinoflagellate cyst biostratigraphy of the Península Valdés, Patagonia, Argentina

Expedition 403 Scientific Prospectus: Eastern Fram Strait Paleo-Archive (FRAME)

Acoustic evidence of hydrocarbon release associated with the Spitsbergen Transform Fault, north of the Molloy Ridge, Fram Strait

Contact Info

Product

Resources

About