Application of Brillouin thermometry to latest Pleistocene and Holocene halite from Searles Lake, California, USA

Olson, Kristian J.; Guillerm, Emmanuel; Peaple, Mark D.; Lowenstein, Tim K.; Gardien, Véronique; Caupin, Frédéric; Feakins, Sarah J.; Tierney, Jessica E.; Stroup, Justin S.; Lund, Steve P.; McGee, David

doi:10.1016/j.epsl.2022.117913

Cited by 5 publications

(6 citation statements)

References 36 publications

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“…However, MBT' 5Me was found to be relatively insensitive to changes in salinity in Searles Lake over the past 200 ka (Peaple, Bhattacharya, Lowenstein, et al., 2022). BayMBT 0 temperature interpretations were corroborated by independent evidence from the Brillouin approach applied to evaporite minerals across the last 40 ka (Olson et al., 2023). We also note that BayMBT 0 temperatures discern reasonable glacial and interglacial temperature offsets as well as Pliocene M2 glacial and mPWP offsets (Figure 5) compared to the modern months above freezing mean temperature.…”

Section: Discussionmentioning

confidence: 79%

“…The vegetation of the lowlands is mostly desert shrubs with montane woodlands and forests on the Sierra Nevada. Packrat middens containing macrofossils allow for species level identification and show that Juni- (Liddicoat et al, 1980) updated to the GPTS2020 (Channell et al, 2020;Ogg, 2020) (red circles). This study focused on the late Pliocene perennial lake phase (blue shading), terminating 18 m below the Gauss-Matuyama boundary (labeled G/M, 522.9 m, 2.606 Ma, 3 ka 1σ) (Liddicoat et al, 1980;Smith et al, 1983).…”

Section: Mojave Desert Hydroclimate and Vegetationmentioning

confidence: 99%

“…We studied the Searles Lake sediment core KM-3 (USGS U234, well KM-3, 35.73371°N, 117.32566°W, 493 m asl) collected in 1968 by the Kerr-McGee Corporation and transferred to the US Geological Survey in 1976 (Liddicoat et al, 1980) and archived for 50 years in ambient, dry storage (USGS Core Research Center, Denver). We generated a Bayesian age model (Blaauw & Christeny, 2011) for sediments from depths of 200-693 m (Figure 2) using previously identified paleomagnetic reversals (Liddicoat et al, 1980) and updated age estimates (Channell et al, 2020); data set available at NOAA: Peaple, Bhattacharya, Tierney, et al, 2022) on the GPTS2020 timescale (Ogg, 2020).…”

Section: Sediment Core and Age Modelmentioning

confidence: 99%

“…Interpretation of the core sediments indicate that Searles Valley experienced several lake highstands that overflowed the sill several times since the Pliocene (Jannik et al., 1991). Searles Valley contains a dry lake bed with evaporite deposits spanning the Holocene, atop deposits of lake muds deposited during Pleistocene pluvials and evaporites formed during drier periods (Knott et al., 2021; Olson & Lowenstein, 2021; Olson et al., 2023; Smith, 2009). The wettest times of the last 200 ka coincided with terminations T2 and T1 following the last two glacial maxima of marine isotope stages (MIS) 6 and 2 (Peaple, Bhattacharya, Lowenstein, et al., 2022; Stroup et al., 2023).…”

Section: Introductionmentioning

confidence: 99%

“…Figure 2. (a) Age model generated using BACON (black line), 95% confidence interval (gray shading) and paleomagnetic datums(Liddicoat et al, 1980) updated to the GPTS2020(Channell et al, 2020;Ogg, 2020) (red circles). This study focused on the late Pliocene perennial lake phase (blue shading), terminating 18 m below the Gauss-Matuyama boundary (labeled G/M, 522.9 m, 2.606 Ma, 3 ka 1σ)(Liddicoat et al, 1980;Smith et al, 1983).…”

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confidence: 99%

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Biomarker Evidence for an MIS M2 Glacial‐Pluvial in the Mojave Desert Before Warming and Drying in the Late Pliocene

Peaple,

Bhattacharya,

Tierney

et al. 2024

Paleoceanog and Paleoclimatol

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Ancient lake deposits in the Mojave Desert indicate that the water cycle in this currently dry place was radically different under past climates. Here we revisit a 700 m core drilled 55 years ago from Searles Valley, California, that recovered evidence for a lacustrine phase during the late Pliocene. We update the paleomagnetic age model and extract new biomarker evidence for climatic conditions from lacustrine deposits (3.373–2.706 Ma). The MBT′5Me temperature proxy detects present‐day conditions (21 ± 3°C, n = 2) initially, followed by warmer‐than‐present conditions (25 ± 3°C, n = 17) starting at 3.268 and ending at 2.734 Ma. Bacterial and archeal biomarkers reveal lake salinity increased after 3.268 Ma likely reflecting increased evaporation in response to higher temperatures. The δ13C values of plant waxes (−30.7 ± 1.4‰, n = 28) are consistent with local C3 taxa, likely expanded conifer woodlands during the pluvial with less C4 than the Pleistocene. δD values (−174 ± 5‰, n = 25) of plant waxes indicate precipitation δD values (−89 ± 5‰, n = 25) in the late Pliocene are within the same range as the late Pleistocene precipitation δD. Microbial biomarkers identify a deep, freshwater lake and a cooling that corresponds to the onset of major Northern Hemisphere glaciation at marine isotope stage marine isotope stages M2 (3.3 Ma). A more saline lake persisted for ∼0.6 Ma across the subsequent warmth of the late Pliocene (3.268–2.734 Ma) before the lake desiccated at the Pleistocene intensification of Northern Hemisphere Glaciation.

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Section: Discussionmentioning

confidence: 79%