Neogene siliciclastic deposition and climate variability on a carbonate margin: Australian Northwest Shelf

Tagliaro, Gabriel; Fulthorpe, Craig S.; Gallagher, Stephen; McHugh, C. M.; Kominz, Michelle A.; Lavier, L. L.

doi:10.1016/j.margeo.2018.06.007

Cited by 14 publications

(37 citation statements)

References 67 publications

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“…The black Miocene layers (523.58 and 532.25 CSF-A (m); Figure 2A) are several centimeters thick and closely resemble the relatively thick algal mats deposited in the middle to lower intertidal zone of the modern Abu Dhabi sabkha system (Strohmenger et al, 2007(Strohmenger et al, , 2011; Figure 1). They are often associated with replacive nodular anhydrite with a chickenwire texture, which typically forms as a diagenetic overprint in the supratidal zone of sabkhas (Warren and Kendall, 1985;Strohmenger et al, 2011;Groeneveld et al, 2017;Tagliaro et al, 2018). The Miocene black layers contain noticeably less halite compared to their Holocene counterparts.…”

Section: Sedimentologymentioning

confidence: 99%

“…Here, we propose to investigate whether the distribution of the different GDGT compounds is the same in different locations and whether the patterns shown in modern sabkhas are also preserved in ancient sabkhas. IODP site 1464 (18 • 3.9115 S, 118 • 37.8935 E) is located on the Northwestern shelf of Australia in the Roebuck Basin in 270 m water depth (Groeneveld et al, 2017;Tagliaro et al, 2018). This site was drilled as part of IODP expedition 356.…”

Section: Introductionmentioning

confidence: 99%

“…This site was drilled as part of IODP expedition 356. For this project, 7 samples were taken across suspected sabkha sediments from the site (Figure 2), which, according to the biostratigraphic age model, date to the Mid-Miocene, around 12-13 Ma (Groeneveld et al, 2017;Tagliaro et al, 2018). These were then compared to four Holocene sediment samples taken from a current well-studied sabkha in Abu Dhabi (Kenig et al, 1990;Alsharhan and Kendall, 2003;Bontognali et al, 2010;Strohmenger et al, 2011;Campbell et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Distribution of Glycerol Dialkyl Glycerol Tetraethers (GDGTs) in Microbial Mats From Holocene and Miocene Sabkha Sediments

2019

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Sabkhas are important settings for understanding early earth biological environments, and the algal mats associated with them are thought to be potential source rocks for hydrocarbon production. In this study we compare the sedimentological facies and distribution of branched, and isoprenoid glycerol dialkyl glycerol tetraethers (GDGTs) in modern and mid-Holocene sabkha sediments from Abu Dhabi with well-preserved Miocene (12-13 Ma) sabkha sediments recently recovered at IODP site U1464 off the north coast of Australia. We show that the facies of the Miocene sediments is very similar to Holocene and modern sabkhas. Furthermore, we show that there are distinct patterns of isoprenoid GDGT distributions in the modern sabkha and that these patterns are well preserved in both the buried Holocene and the Miocene algal mats. The sabkha sediments analyzed are characterized by high %GDGT-0 and methane index, dominance of branched GDGTs over crenarchaeol (high BIT index), an unusual distribution of isoprenoid GDGTs 1-3, and also low abundance of archeol. The distribution of branched GDGT differs between modern and Miocene sabkhas and is similar in Miocene sabkha and non-sabkha sediments suggesting that they may be of limited use to distinguish paleo-sabkha sediments. Overall, isoprenoid GDGT distributions appear to be different from those found in modern soils, lakes and marine sediments, as well as from those found in Miocene shallow water sediments right below the sabkha, therefore they could be used in combination with facies analysis to identify paleo-sabkha environments in sedimentary sequences.

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Section: Sedimentologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Distribution of Glycerol Dialkyl Glycerol Tetraethers (GDGTs) in Microbial Mats From Holocene and Miocene Sabkha Sediments

2019

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“…It is therefore important to link the terrestrial processes with long-term marine paleoclimatic records on the continental shelves. 356 study area (Keep et al, 2007;Tagliaro et al, 2018;Woods, 1988Woods, , 1994. The major phase of tectonic activity occurred from 6-5 Ma and accounted for 300 m of subsidence, driven by a combination of long-term low frequency and more localized vertical motions (Gurnis et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Late Miocene tectonic events include the reactivation of major faults in northern Australia (Cathro et al, 2003; Keep et al, 2007; Müller et al, 1998), driven by the northward movement of the continent. Fault reactivation accounted for subsidence in NW Australia under a contractional deformation regime and generation of submarine canyon systems that transported terrestrial sediments into the Expedition 356 study area (Keep et al, 2007; Tagliaro et al, 2018; Woods, 1988, 1994). The major phase of tectonic activity occurred from 6–5 Ma and accounted for 300 m of subsidence, driven by a combination of long‐term low frequency and more localized vertical motions (Gurnis et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

The Late Miocene to Early Pliocene “Humid Interval” on the NW Australian Shelf: Disentangling Climate Forcing From Regional Basin Evolution

Karatsolis

Vleeschouwer

Groeneveld

et al. 2020

Paleoceanog and Paleoclimatol

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Pre-Quaternary paleoclimate studies in Australia mainly focus on terrestrial records from the southeastern part of the continent. IODP Expedition 356 drilled on the northwestern Australian shelf, yielding Miocene-Pleistocene paleoclimate records in an area where climate archives are scarce. Postexpedition research revealed a dry-to-humid transition across the latest Miocene and early Pliocene (start of the "Humid Interval"). However, the complex tectonic history of the area makes these interpretations challenging. In this study, we investigate late Miocene to early Pliocene sediment cores from two sites that are only 100 km apart but situated in two adjacent basins (Northern Carnarvon and Roebuck Basins). Combining lithofacies study, time series analysis of potassium content (K wt%), and calcareous nannofossil abundance counts (N/g), this work disentangles the complex interplay between basin evolution and climate change between 6.1 and 4 Ma. Overall, the investigated proxies show high correlation between both sites, except during 6.1-5.7 Ma. During this interval, Site U1463 records a gradual increase in K wt%, correlated with basin deepening, whereas Site U1464 records an abrupt rise in K wt% at~6 Ma. We explain this diachronicity by differential basin subsidence. The tectonic interplay with our paleorecords makes it difficult to pinpoint the exact onset of the "Humid Interval," but we conclude that K wt% and coccolith abundances at Site U1464 indicate that a fluvial deposition system was already established since at least 6 Ma. This age is consistent with data supporting a southward movement of the Intertropical Convergence Zone rain belt at~7 Ma. Previous work has revealed long-term and short-term fluctuations of arid and humid conditions during the Pleistocene and Pliocene, with a bias toward paleorecords from the southeastern part of the continent (

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Dating the northwest shelf of Australia since the Pliocene

Groeneveld

Vleeschouwer

Jackson³

et al. 2020

Preprint

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Accurate dating of marine sediments is essential to reconstruct past changes in oceanography and climate (Bronk Ramsey, 2009;Huybers & Wunsch, 2004;Lisiecki & Lisiecki, 2002). Global stacks, compilations or splices of long-term oxygen isotope records related to ice volume and temperature are commonly applied to correlate deep ocean records, and to construct age models (De Vleeschouwer et al., 2017;Lisiecki & Raymo, 2005;Zachos et al., 2001). However, for proximal settings with high sedimentation rates such stacks cannot always be used. The supply of large amounts of sediments may dilute the number of microfossils in the sediment to such a degree that geochemical analyses needed to perform the correlation to a global

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Neogene siliciclastic deposition and climate variability on a carbonate margin: Australian Northwest Shelf

Cited by 14 publications

References 67 publications

Distribution of Glycerol Dialkyl Glycerol Tetraethers (GDGTs) in Microbial Mats From Holocene and Miocene Sabkha Sediments

Distribution of Glycerol Dialkyl Glycerol Tetraethers (GDGTs) in Microbial Mats From Holocene and Miocene Sabkha Sediments

The Late Miocene to Early Pliocene “Humid Interval” on the NW Australian Shelf: Disentangling Climate Forcing From Regional Basin Evolution

Dating the northwest shelf of Australia since the Pliocene

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