Reconstruct hydrological history of terrestrial saline lakes using Mg isotopes in halite: A case study of the Quaternary Dalangtan playa in Qaidam Basin, NW China

Xia, Zhiguang; Lin, Yan-Bo; Wei, Hai-Zhen; Hu, Zhongya; Liu, Chuan; Li, Weiqiang

doi:10.1016/j.palaeo.2021.110804

Cited by 12 publications

(11 citation statements)

References 74 publications

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“…With exponential law, the Sr isotope data were normalized to 86 Sr/ 88 Sr = 0.1194. All the measured 87 Sr/ 86 Sr ratios of standards (Table S4) are consistent with published values 18,42,46 .…”

Section: Sr Isotope Analysessupporting

confidence: 89%

“…Halite samples were rst cleaned by wiping with lint-free paper towels (Kimwipes®); about 1-2g sample was scraped off by a tungsten carbide scraper and subsequently ultrasonically cleaned in anhydrous ethanol (> 99.7%) for 5 min. After the sample was cleaned and dried, it was dissolved in 12ml deionized water (18.2 MΩ cm) as a stock solution 20,42 . The dolostone samples were ground into 200 mesh in a precleaned agate mortar.…”

Section: Sample Preparationmentioning

confidence: 99%

“…A 1ppm multi-element standard was bracketed every ten samples to monitor and correct the instrument drift. The long-term external accuracy (2RSD, or two times of relative standard deviation) of elemental analysis is better than 10% 20,42 .…”

Section: Element Analysesmentioning

confidence: 99%

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The evolution of Earth’s surficial Mg cycle over the past 2 billion years

Xia

et al. 2022

Preprint

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The surficial cycling of Mg is directly coupled with the global carbon cycle, a predominant control of Earth’s climate. However, how Earth’s surficial Mg cycle evolved with time had been elusive. Magnesium isotope signatures of seawater (δ26Mgsw) track the surficial Mg cycle, which could provide crucial information on the carbon cycle in Earth’s history. Here, we present a reconstruction of δ26Mgsw evolution over the last 2 billion years using marine halite fluid inclusions and sedimentary dolostones. The two independent archives yield consistent evolutionary trends of δ26Mgsw for the past 430 million years, and the dolostone records extend the δ26Mgsw curve to 2 billion years ago. Modeling results of the net CO2 sequestration efficiency (EMg−CO2) by the surficial Mg cycle based on the δ26Mgsw record reveal a secular decline EMg−CO2 during the past 2 billion years, with the periods of low EMg−CO2 coinciding with ice ages in the Phanerozoic. Our work underlines a previously under-appreciated, but indispensable role of dolostones in regulating Earth’s climate on geologic time scales.

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Section: Sr Isotope Analysessupporting

confidence: 89%

Section: Sample Preparationmentioning

confidence: 99%

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The evolution of Earth’s surficial Mg cycle over the past 2 billion years

Xia

et al. 2022

Preprint

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“…Halite samples are first cleaned by wiping with lint-free paper towels (Kimwipes); about 1- to 2-g sample is scraped off by a tungsten carbide scraper and subsequently ultrasonically cleaned in anhydrous ethanol (>99.7%) for 5 min. After the sample is cleaned and dried, it is dissolved in 12 ml of deionized water (18.2 megohm cm) as a stock solution ( 22 , 52 ). The dolostone samples are ground into 200 mesh in a precleaned agate mortar.…”

Section: Methodsmentioning

confidence: 99%

“…A 1 parts per million (ppm) multi-element standard is bracketed every 10 samples to monitor and correct the instrument drift. The long-term external accuracy (2RSD, two times relative standard deviation) of elemental analysis is better than 10% ( 22 , 52 ).…”

Section: Methodsmentioning

confidence: 99%

The evolution of Earth’s surficial Mg cycle over the past 2 billion years

Xia,

Li,

et al. 2024

Sci. Adv.

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The surficial cycling of Mg is coupled with the global carbon cycle, a predominant control of Earth’s climate. However, how Earth’s surficial Mg cycle evolved with time has been elusive. Magnesium isotope signatures of seawater (δ 26 Mg sw ) track the surficial Mg cycle, which could provide crucial information on the carbon cycle in Earth’s history. Here, we present a reconstruction of δ 26 Mg sw evolution over the past 2 billion years using marine halite fluid inclusions and sedimentary dolostones. The data show that δ 26 Mg sw decreased, with fluctuations, by about 1.4‰ from the Paleoproterozoic to the present time. Mass balance calculations based on this δ 26 Mg sw record reveal a long-term decline in net dolostone burial (NDB) over the past 2 billion years, due to the decrease in dolomitization in the oceans and the increase in dolostone weathering on the continents. This underlines a previously underappreciated connection between the weathering-burial cycle of dolostone and the Earth’s climate on geologic timescales.

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