New constraints on the provenance of the ANDRILL AND‐2A succession (western Ross Sea, Antarctica) from apatite triple dating

Zattin, Massımılıano; Andreucci, Benedetta; Thomson, S. N.; Reiners, Peter W.; Talarico, F.

doi:10.1029/2012gc004357

Cited by 37 publications

(36 citation statements)

References 82 publications

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“…The McMVG, which surrounds the McMurdo Sound and VLB Basins, consists of several large alkaline stratovolcanoes associated with the West Antarctic rift system (Gunn & Warren, 1962;Kyle, 1990; Figure 1). Eruptions began in the late Oligocene (~26 Ma; Sandroni & Talarico, 2004;Smellie, 2000;Zattin et al, 2012) and became more frequent after~20 Ma (Di Vincenzo et al, 2010). Mount Morning is the only known source of early to middle Miocene volcanic material recovered from AND-2A core (Di Roberto et al, Vincenzo et al, 2010;Nyland et al, 2013).…”

Section: Location and Geological Settingmentioning

confidence: 99%

Miocene Glacial Dynamics Recorded by Variations in Magnetic Properties in the ANDRILL‐2A Drill Core

et al. 2019

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During the 2007 ANtarctic geological DRILLing (ANDRILL) campaign in the Ross Sea, Antarctica, the AND‐2A core was recovered through a stratigraphic succession spanning 1,138.54 m of Neogene sedimentary rocks that include an expanded early to middle Miocene sequence. The study reported here focuses on the magnetic properties of the interval from 778.63 m below sea floor (mbsf) to 1,138.54 mbsf, which comprises a time interval spanning 1.5 Myr, from ~18.7 to ~20.2 Ma. We recognize three main pulses of increased input of magnetic materials to the drill site between 778.34–903.06, 950.55–995.78, and 1,040–1,103.96 mbsf. Trends in the magnetic mineral concentration dependent parameters mirror changes in the proportion of sediments derived from McMurdo Volcanic Group rocks. We suggest that these pulses in magnetic mineral concentration reflect changes in sediment transport processes associated with changing glacial conditions at the drill site that included (1) subglacial and grounding zone proximal settings, (2) hemipelagic and neritic conditions with abundant sediment‐rich icebergs, and (3) grounding zone‐distal environment that was covered by land‐fast multiyear sea ice or a fringing ice shelf. The magnetic minerals record preserved in the AND‐2A core supports other data that indicate a highly dynamic and variable coastal environment during the early Miocene, where glaciers retreated inland under warm climatic conditions and advanced beyond the drill site across the continental shelf when cold climate prevailed.

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Section: Location and Geological Settingmentioning

confidence: 99%

Miocene Glacial Dynamics Recorded by Variations in Magnetic Properties in the ANDRILL‐2A Drill Core

et al. 2019

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“…() mainly discussed the tectonic implications of this young erosional event, no climate implication on WAIS dynamics has been investigated. In the ANDRILL cores (Talarico et al ., ; Zattin et al ., , ; Sandroni and Talarico, ) fission‐track analysis of detrital apatites coupled with sedimentary clasts analysis was used to reconstruct the Miocene glacial flows. These studies revealed a syn‐sedimentary volcanic origin for most young FT apatites (pre‐McMurdo Eocene volcanic event, Zattin et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Evidence of a full West Antarctic Ice Sheet back to the early Oligocene: insight from double dating of detrital apatites in Ross Sea sediments.

et al. 2015

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The West Antarctic Ice Sheet is the most unstable component of the Antarctic cryosphere. Its fluctuations are well documented since the Pliocene, but its behaviour over the last 35 Ma is more controversial, particularly during periods of past high global pCO 2 values similar to those predicted in future global climate scenarios. Here, we present new U-Pb dating of detrital apatite grains (previously dated by the fission-track method) from Cape Roberts Project Oligocene to Pliocene marine sediments in the Ross Sea. Two past ice-flow patterns were identified: one formed by outlet glaciers sourcing short-travelled apatites and one, northerly directed, bringing far-travelled apatite grains. The latter provides the first robust physical evidence for the presence and repeated expansion of an Oligocene West Antarctic Ice Sheet.

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“…Therefore, for unknown grains yielding Mesozoic or older ages, 207 Pb-corrected age uncertainties either >25% or >100 Ma at the 2r level were thus excluded from single-grain age-plots (though not from Tera Wasserburg). This approach is ultimately arbitrary, but is similar to previously published approaches used in Zattin et al (2012), Mark et al (2016), andO'Sullivan et al (2016). This method is unsatisfactory for very young grains, however, as a given fixed age uncertainty as a percentage of the total age approaches infinity as the age of grains approaches 0 Ma.…”

Section: Single Grain La-icp-ms Analysesmentioning

confidence: 97%

“…U-Pb Dating of Detrital Apatite by LA-ICPMS Due to advances in LA-ICP-MS data reduction and matrix-matched standards, it is now possible to accurately, precisely and rapidly date apatite grains containing appreciable common-Pb by U-Pb geochronology (e.g., Chew et al 2014;Thomson et al 2012). This has led to a number of provenance studies employing the apatite U-Pb system in recent years (e.g., Carrapa et al, 2009;Mark et al, 2016;O'Sullivan et al, 2016;Zattin et al, 2012).…”

Section: Why Study the River Tarn?mentioning

confidence: 99%

“…Here, we employ the detrital apatite U-Pb thermochronometer. While detrital apatite fission-track is a wellknown and well-established field of sediment tracking (e.g., Carter, 1999), apatite U-Pb analysis is still an under-utilized, though proven (e.g., Carrapa et al, 2009;Mark et al, 2016;O'Sullivan et al, 2016;Zattin et al, 2012) provenance tool. We investigate the efficacy of pairing the expanding field of detrital apatite traceelement analysis (e.g., Abdullin et al, 2016) with recent improvements to the apatite U-Pb method (Chew et al, 2011;Thomson et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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An Integrated Apatite Geochronology and Geochemistry Tool for Sedimentary Provenance Analysis

O’Sullivan

Chew

Morton

et al. 2018

Geochem Geophys Geosyst

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Sediment provenance studies utilizing detrital geochronology are often limited by source‐rock non‐uniqueness with respect to mineral age. Thus, the development of integrated techniques which permit identification of source rock age and lithology are highly desirable. In this case study from the southern Massif Central, France, we target modern‐river sediment from the river Tarn to assess the utility of combined U‐Pb and multiple trace‐element geochemical analysis of detrital apatite as a provenance tool. The study area was chosen because the sediment source areas chiefly comprise a relatively simple mix of medium‐ to low‐grade Variscan metasediments and late Variscan granitoids, which should yield detrital apatite readily distinguishable by age, trace‐element chemistry, or both. Based on comparison with previously published apatite trace‐element data from metasedimentary rocks and granitoids, pelitic apatite in the river Tarn detritus is primarily distinguished by high Sr/Mn, light rare‐earth element depletion (LREE) and low actinide contents, whereas granitic apatite is characterized by much lower Sr/Mn, and high LREE and actinide abundances. These source rock determinations are highly consistent with apatite trace‐element data from Tarn tributaries that drain either predominantly metapelitic or granitoid catchments. U‐Pb analysis of detrital rutile was also undertaken on those catchments for comparative purposes. As pelitic and granitic apatite can be readily distinguished, samples that have experienced downstream sediment mixing can then be comprehensively characterized. Using this method we identify a source lithology for nearly every analyzed apatite grain in the river sediment, even though 59% of the analyzed grains do not yield reliable U‐Pb ages.

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New constraints on the provenance of the ANDRILL AND‐2A succession (western Ross Sea, Antarctica) from apatite triple dating

Cited by 37 publications

References 82 publications

Miocene Glacial Dynamics Recorded by Variations in Magnetic Properties in the ANDRILL‐2A Drill Core

Miocene Glacial Dynamics Recorded by Variations in Magnetic Properties in the ANDRILL‐2A Drill Core

Evidence of a full West Antarctic Ice Sheet back to the early Oligocene: insight from double dating of detrital apatites in Ross Sea sediments.

An Integrated Apatite Geochronology and Geochemistry Tool for Sedimentary Provenance Analysis

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