RECONCILING EVIDENCE FROM OUTCROPS AND DEEP-LAKE SEDIMENTS: THE CONUNDRUM OF OXYGEN ISOTOPES IN GLACIAL-ERA MONO LAKE, CALIFORNIA

2016 ◽  
Author(s):  
Susan Herrgesell Zimmerman ◽  
◽  
Guleed A.H. Ali ◽  
Sidney R. Hemming
Keyword(s):  
Lake Sediments ◽  
Oxygen Isotopes ◽  
Mono Lake ◽  
Deep Lake

SOURCES OF CARBONATE PRECIPITATION IN MONO LAKE SEDIMENTS: δ18O AND CARBONATE CLUMPED ISOTOPES AS LAKE LEVEL PROXIES

2017 ◽  
Author(s):  
Miquela Ingalls ◽  
◽  
Sophie Westacott ◽  
Makayla Betts ◽  
Jana Meixnerova ◽  
...  
Keyword(s):  
Lake Sediments ◽  
Lake Level ◽  
Mono Lake ◽  
Carbonate Precipitation ◽  
Clumped Isotopes

scholarly journals Separation and 14C Dating of Pure Pollen from Lake Sediments: Nanofossil AMS Dating

Radiocarbon ◽  
1992 ◽  
Vol 34 (3) ◽  
pp. 557-560 ◽  
Author(s):  
Austin Long ◽  
Owen K. Davis ◽  
Jeanne de Lanois
Keyword(s):  
Organic Matter ◽  
Lake Sediments ◽  
Mono Lake ◽  
Bulk Sediment ◽  
Clean Room ◽  
14C Dating ◽  
Ams Dating

We have developed and tested a practical device for manually separating pollen from pollen concentrates in sufficient quantity for AMS 14C dating. It is a combination of standard, commercially available equipment handled in a clean room by an individual trained to recognize pollen. A typical example requires about 15–20 h of hand-picking under the microscope. We show the usefulness of this procedure with results on a mid-Holocene segment from a core from Mono Lake. Sediments from this hardwater lake contain pollen and finely disseminated organic matter, but no macrofossils. The pollen dated ca. 1000 yr younger than the bulk sediment. The sediment “date” is most likely affected by incorporation of limestone-derived carbon, and is erroneously old.

scholarly journals Stable isotope studies on Mono Lake (California). 1. d18 in lake sediments as proxy for climatic change during the last 150 years

1997 ◽  
Vol 42 (2) ◽  
pp. 230-238 ◽  
Author(s):  
Hong-Chun Li ◽  
Teh-Lung Ku ◽  
Lowell D. Stott ◽  
Robert F. Anderson
Keyword(s):  
Stable Isotope ◽  
Lake Sediments ◽  
Climatic Change ◽  
Mono Lake ◽  
Isotope Studies

Changes in hydroclimate during last deglaciation lake-level fall in the Dead Sea sediment record

2020 ◽  
Author(s):  
Markus J. Schwab ◽  
Daniela Müller ◽  
Ina Neugebauer ◽  
Rik Tjallingii ◽  
Yoav Ben Dor ◽  
...  
Keyword(s):  
Lake Sediments ◽  
Lake Level ◽  
Drainage Basin ◽  
Eastern Mediterranean ◽  
Dead Sea ◽  
Laminated Sediments ◽  
Last Deglaciation ◽  
Sediment Record ◽  
Deep Lake ◽  
The Dead

<p>The drainage basin of the Dead Sea is the largest hydrological system in the Levant and spans across the boundary between the sub-humid to semi-arid Mediterranean and the arid to hyper-arid Saharo-Arabian climate zones. As a terminal lake, precipitation changes due to climatic variations result in extensive fluctuations of lake level and sediment deposition.</p><p>A unique sediment record from the deepest part of the Dead Sea Basin was obtained as part of the ICDP Dead Sea Deep Drilling Project. Here we analyze the partially annually laminated sediments of Core 5017-1-A between 88.5-99.2 m core depth, which comprise the period between ~16.5 and ~11 ka and document a lake level drop of ca 160 m. In the sediments of Core 5017-1-A, this marks the transition from MIS2 aad (alternating aragonite and detritus) sediments to MIS1 halite deposits and ld (laminated detrital marl) sediments, coinciding with increased drying in the Dead Sea watershed.</p><p>Microfacies analyses show the occurrence of several lithological facies that accumulated during MIS2: aad, gd (massive gypsum deposit within marl), native sulfur concretions (associated with greenish colored aad), mtd (mass-transport deposits, typically graded) and homogenites consisting of clay and silt. Further, flood layers have been identified, potentially indicating rainstorms associated with specific eastern Mediterranean synoptic systems. To complement the microfacies analyses, XRF scanning provides continuous Ti/Ca and S/Ca records to reconstruct relative detrital input and gypsum occurrence, respectively. Additionally, to study potential early signs of hydroclimatic change, the deep lake sediments are correlated to the Lisan Formation of the marginal Masada outcrop using distinct gypsum marker layers, indicative of pronounced lake level drops. However, due to a significant lake level decline, the Masada outcrop sediments terminate at around 14.5 ka and the subsequent lake level lowering is solely recorded in the deep lake sediments.</p><p>This study was funded by the German Science Foundation (DFG Grant BR 2208/13-1/-2). Further, it is a contribution to the Helmholtz Association (HFG) climate initiative REKLIM Topic 8 “Abrupt climate change derived from proxy data”.</p>

Chronostratigraphy and lake-level changes of Laguna Cari-Laufquén, Río Negro, Argentina

2011 ◽  
Vol 76 (3) ◽  
pp. 430-440 ◽  
Author(s):  
Alyson Cartwright ◽  
Jay Quade ◽  
Scott Stine ◽  
Kenneth D. Adams ◽  
Wallace Broecker ◽  
...  
Keyword(s):  
South America ◽  
Lake Sediments ◽  
High Latitude ◽  
Lake Level ◽  
Late Quaternary ◽  
Deep Lake ◽  
Common Cause ◽  
Rio Negro ◽  
Temperature Depression ◽  
Lake Record

AbstractEvidence from shoreline and deep-lake sediments show Laguna Cari-Laufquén, located at 41°S in central Argentina, rose and fell repeatedly during the late Quaternary. Our results show that a deep (> 38 m above modern lake level) lake persisted from no later than 28 ka to 19 ka, with the deepest lake phase from 27 to 22 ka. No evidence of highstands is found after 19 ka until the lake rose briefly in the last millennia to 12 m above the modern lake, before regressing to present levels. Laguna Cari-Laufquén broadly matches other regional records in showing last glacial maximum (LGM) highstands, but contrasts with sub-tropical lake records in South America where the hydrologic maximum occurred during deglaciation (17–10 ka). Our lake record from Cari-Laufquén mimics that of high-latitude records from the Northern Hemisphere. This points to a common cause for lake expansions, likely involving some combination of temperature depression and intensification of storminess in the westerlies belt of both hemispheres during the LGM.

scholarly journals Revised chronology for late Pleistocene Mono Lake sediments based on paleointensity correlation to the global reference curve

2006 ◽  
Vol 252 (1-2) ◽  
pp. 94-106 ◽  
Author(s):  
Susan H. Zimmerman ◽  
Sidney R. Hemming ◽  
Dennis V. Kent ◽  
Stephanie Y. Searle
Keyword(s):  
Lake Sediments ◽  
Late Pleistocene ◽  
Mono Lake ◽  
Reference Curve

RADIOCARBON DATING POLLEN GRAINS SORTED BY FLOW CYTOMETRY FROM LAKE SEDIMENTS OF MONO LAKE (CALIFORNIA)

2017 ◽  
Author(s):  
Irene Tunno ◽  
◽  
Susan H. Zimmerman ◽  
Tom Brown ◽  
Christiane A. Hassel
Keyword(s):  
Flow Cytometry ◽  
Lake Sediments ◽  
Radiocarbon Dating ◽  
Pollen Grains ◽  
Mono Lake

Dating deep-lake sediments by using amino acid racemization in fossil ostracodes

Geology ◽  
2003 ◽  
Vol 31 (12) ◽  
pp. 1049 ◽  
Author(s):  
Darrell Kaufman
Keyword(s):  
Amino Acid ◽  
Lake Sediments ◽  
Deep Lake ◽  
Amino Acid Racemization
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