Early diagenetic constraints on Permian seawater chemistry from the Capitan Reef

Bryant, Roger; Present, Theodore M.; Ahm, Anne‐Sofie C.; McClelland, H. L. O.; Razionale, Dan; Blättler, Clara L.

doi:10.1016/j.gca.2022.04.027

Cited by 7 publications

(5 citation statements)

References 116 publications

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“…Nonetheless, dolomitization invariably removes light Mg isotopes from the fluid, elevating the δ 26 Mg value of the remaining fluid and the δ 26 Mg values of dolomite precipitated from that fluid ( 23 , 24 ). Therefore, δ 26 Mg values of marine dolostones tend to be higher than the seawater-equilibrated δ 26 Mg value, and the lowest δ 26 Mg values of syn-depositional dolostones have the greatest possibility of approaching the seawater-equilibrated δ 26 Mg values ( 19 , 28 ).…”

Section: Resultsmentioning

confidence: 99%

“…Isotopic evolution of Mg in dolomitization fluids can occur along a diffusion/advection profile on a scale of meters to hundreds of meters ( 17 , 25 , 26 ) or across a carbonate platform on a scale of hundreds of kilometers (Supplementary Materials and figs. S4 and S5) or even within an enclosed basin on the continental scale ( 19 , 27 ). Nonetheless, dolomitization invariably removes light Mg isotopes from the fluid, elevating the δ 26 Mg value of the remaining fluid and the δ 26 Mg values of dolomite precipitated from that fluid ( 23 , 24 ).…”

Section: Resultsmentioning

confidence: 99%

“…Several studies reconstructed the Mg isotope composition of seawater during the Cenozoic using biogenic calcite or aragonite ( 8 , 18 ). Calcite and aragonite, however, are susceptible to diagenesis, thus their fidelity as Mg isotope archives for older geological times may require additional constraints (such as Ca isotopes) for verification ( 19 ). In contrast, Mg isotopes in dolomite have proven to be resistant to various postdepositional overprinting processes ( 20 , 21 ).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…and non-traditional metal isotopes (Ca, Mg, Mo, etc. ), provide novel approach in determining the effects of BSR/TSR (e.g., Cai et al, 2017), thermal histories (e.g., Mangenot et al, 2018;Cong et al, 2021), organic matter enrichment mechanisms (e.g., Zhu et al, 2022), diagenetic fluid properties (e.g., Shalev et al, 2021;Bryant et al, 2022).…”

Section: Prospectsmentioning

confidence: 99%

Enrichment Mechanism and Prospects of Deep Oil and Gas

Hao

2022

Acta Geologica Sinica (Eng)

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With the deepening of oil and gas exploration, the importance of depth is increasingly highlighted. The risk of preservation of storage space in deep reservoirs is greater than that in shallow and medium layers. Deep layers mean older strata, more complex structural evolution and more complex hydrocarbon accumulation processes, and even adjustment and transformation of oil and gas reservoirs. This paper systematically investigates the current status and research progress of deep oil and gas exploration around the world and looks forward to the future research focus of deep oil and gas. In the deep, especially the ultra-deep layers, carbonate reservoirs play a more important role than clastic rocks. Karst, fault•karst and dolomite reservoirs are the main types of deep and ultra-deep reservoirs. The common feature of most deep large and medium-sized oil and gas reservoirs is that they formed in the early with shallow depth. Fault activity and evolution of trap highs are the main ways to cause physical adjustment of oil and gas reservoirs. Crude oil cracking and thermochemical sulfate reduction (TSR) are the main chemical modification effects in the reservoir. Large-scale high-quality dolomite reservoirs is the main direction of deep oil and gas exploration. Accurate identification of oil and gas charging, adjustment and reformation processes is the key to understanding deep oil and gas distribution. High-precision detection technology and high-precision dating technology are an important guarantee for deep oil and gas research.

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“…Despite the highresolution achieved with δ 34 S barite records (Paytan et al, 1998;2004;Markovic et al, 2015;Yao et al, 2018;, barite is predominantly acquired from pelagic sediments, and thus only provides insight into the previous 130 million years (Yao et al, 2019). Although δ 34 S CAS records have been widely employed to understand the ancient sulphur cycle (e.g., Newton et al, 2004;Luo et al, 2010;Song et al, 2014;Crockford et al, 2019;He et al, 2019;, their suitability as a stratigraphic and palaeoenvironmental tool is under scrutiny due to issues of diagenesis (Rennie and Turchyn, 2014;Present et al, 2015;Richardson et al, 2019;Murray et al, 2021;Bryant et al, 2022). Accordingly, much of the variability in δ 34 S CAS across the PTB and Early Triassic has been attributed to post-depositional alteration (Bernasconi et al, 2017;Johnson et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Sulphur isotope stratigraphy of drill cuttings and stratigraphic correlation of Permian-Triassic evaporites

2023

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The stratigraphy of the European late Permian-Triassic commonly lacks chronostratigraphic constraint due to the scarcity of diagnostic fossils for biostratigraphy. This is particularly true for the United Kingdom, and as a result, stratigraphic correlation within and between sedimentary basins is primarily reliant on lithostratigraphy. Evaporitic sulphate can be used to develop time series of δ34Sevap data that can be utilised for stratigraphic correlation. However, the availability of continuous drillcore is limited, whilst drill cuttings are commonly acquired but are widely overlooked for stable isotope stratigraphy. We derive a δ34Sevap record from drill cuttings from the southern North Sea Basin, and successfully correlate it with an equivalent published δ34Sevap record from a continuous drillcore in the Cleveland Basin, Yorkshire, United Kingdom. We have chosen seven points in the δ34Sevap records for stratigraphic correlation, defining eight packages of isotopically distinct coeval strata. This is significant, as the ubiquity of drill cuttings presents the opportunity to derive δ34Sevap curves with high geospatial resolution. Equivalent gamma ray logs were used for correlation and compared with the δ34Sevap curves. The correlations agree relatively well, however, the δ34Sevap correlation permits the development of more robust chronostratigraphic constraints. Specifically, the δ34Sevap records constrain the age of the Bunter Shale and Bunter Sandstone in the western Southern North Sea to the latest Permian. This has significant implications for understanding the stratigraphy and palaeogeographic evolution of United Kingdom Permian-Triassic sedimentary basins, and may have economic implications, since the Bunter Sandstone is being considered as a potential reservoir for CO2 storage in the United Kingdom sector.

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Early diagenetic constraints on Permian seawater chemistry from the Capitan Reef

Cited by 7 publications

References 116 publications

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

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

Enrichment Mechanism and Prospects of Deep Oil and Gas

Sulphur isotope stratigraphy of drill cuttings and stratigraphic correlation of Permian-Triassic evaporites

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