Calculation of simultaneous isotopic and trace element variations during water-rock interaction with applications to carbonate diagenesis

Banner, Jay L.; Hanson, Gilbert N.

doi:10.1016/0016-7037(90)90128-8

Cited by 999 publications

(527 citation statements)

References 17 publications

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“…Burial diagenesis can result in signatures that are similar to carbonates influenced by meteoric diagenesis because temperature increases with burial and carbonates (such as metastable aragonite and high-magnesium calcite) are susceptible to recrystallization over time (Sandberg, 1975). However, fluid isotope compositions at depth (confounded by varying degrees of rock buffering; e.g., Banner and Hanson, 1990) may be quite different from those of surface environments, therefore carbonates forming in a burial environment may exhibit a wide range in ␦ 18 O carb extending to both negative and positive extremes. As a result, interpreting the ␦ 18 O carb of ancient rocks as resulting from primary marine precipitation, meteoric diagenesis or burial diagenesis has remained a longstanding problem in carbonate geochemistry.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Neoproterozoic Wonoka–Shuram Anomaly-aged carbonates: Evidence from clumped isotope paleothermometry

Loyd

Corsetti

Eagle

et al. 2015

Precambrian Research

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a b s t r a c tThe Wonoka-Shuram Anomaly represents the largest negative carbon isotope excursion recognized in the geologic record and is associated with the emergence and diversification of metazoan life ca. 580 million years ago (Ma). The origin of the anomaly is highly debated, with interpretations ranging from primary to diagenetic, each having unique and potentially transformative implications for early life. Here, we apply carbonate clumped isotope thermometry to three sections expressing the anomaly in order to constrain mineral formation temperatures and thus directly calculate water oxygen isotope compositions (␦ 18 O w ) with which carbonate minerals equilibrated. With ␦ 18 O w known, it is possible to address previous hypotheses for the origin of the anomaly. In each section, precipitation temperatures correlate positively with reconstructed ␦ 18 O w . Previous hypotheses, based on the covariance of ␦ 18 O carb vs. ␦ 13 C carb (uncorrected for temperature effects), suggested a meteoric diagenetic origin for the anomaly. However, reconstructed ␦ 18 O w values do not covary with carbon isotope compositions (␦ 13 C carb ) within anomaly facies. Rather, the oxygen isotope and temperature data are consistent with carbonate recrystallization and equilibration under increasingly rock-buffered conditions. Based on simple modeling and comparison to modern formation fluids, recrystallization may have occurred in an environment far removed from the initial depositional or early diagenetic regime. In addition, although clumped isotope temperatures vary significantly and reach elevated values consistent with burial diagenesis, it is unclear to what degree, if at all, carbon isotope values were reset during recrystallization. Ultimately, these new data indicate that Wonoka-Shuram-aged carbonates experienced equilibration with fluids under increasingly closedsystem conditions. The clumped isotope data do not provide a means to distinguish previous hypotheses outright, but provide additional context for the evaluation of geochemical signatures within these ancient carbonate rocks.

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Section: Introductionmentioning

confidence: 99%

Evolution of Neoproterozoic Wonoka–Shuram Anomaly-aged carbonates: Evidence from clumped isotope paleothermometry

Loyd

Corsetti

Eagle

et al. 2015

Precambrian Research

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“…5), suggesting post-depositional alteration related to dolomitization processes, and thus resulting in a decrease of δ 13 C, as well as an increase in the Mn/Sr and Fe/Sr ratios like suggested by Brand and Veizer (1980). However, Banner and Hanson (1990) proposed that δ 18 O values decrease during post-depositional alteration too, but, in this case, the δ 18 O values show a behavior of rising (Fig. 5).…”

Section: And O Isotopic Variationsmentioning

confidence: 96%

“…Recognition of post-depositional alteration processes is extremely important to ensure the reliable application of C isotopic chemostratigraphy (Melezhik et al, 2001). According to Brand and Veizer (1980) and Banner and Hanson (1990), the interaction of carbonates with interstitial fluids during diagenesis, dolomitization or metamorphism leads to an increase in the Rb/Sr, Mn/Sr, Fe/Sr and 87 Sr/ 86 Sr ratios, Note: n.a.= not analyzed. and a decrease in the δ 13 C and δ 18 O values.…”

Section: And O Isotopic Variationsmentioning

confidence: 99%

C, O, and Sr isotopic variations in Neoproterozoic-Cambrian carbonate rocks from Sete Lagoas Formation (Bambuí Group), in the Southern São Francisco Basin, Brazil

et al. 2017

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High-resolution chemostratigraphic data of carbonates from the Sete Lagoas Formation (Bambuí Group) show large variations on the C, O, and Sr isotope compositions. Impure limestones at the base show primal δ 13 C values between -1.0 and 0‰, and δ 18 O values between -12.0 and -8.0‰. However, some dolostones demonstrate δ 13 C values varying from +2.8 to -6.8‰, highly radiogenic 87 Sr/ 86 Sr ratios (>0.7111), and low Sr concentrations (<350 ppm) related to post-depositional processes. In contrast, pure limestones at the top show very positive δ 13 C values between +8.3 and +12.8‰, δ 18 O values between -10.0 to -6.0‰, and 87 Sr/ 86 Sr ratios from 0.7073 to 0.7086, with high Sr concentrations (>900 ppm). They are linked to depositional controls on the carbonate platform, such as fluvial and/or submarine water influx, in which carbonates deposited on the proximal sector exhibit significant Sr isotopic variations and those on the distal sector were not subject to such controls, resulting in very homogeneous Sr isotope profiles. However, 87 Sr/ 86 Sr ratios of the distal carbonates are less radiogenic than carbonates expected for late Ediacaran (~0.7085). This discrepancy suggests a restricted marine basin without Sr isotopic homogenization with contemporary oceans and, in this case, global correlations based on Sr isotope stratigraphy are not reliable. KEYWORDS:Isotopes; Carbonates; Bambuí Group; Ediacaran. RESUMO: Dados quimioestratigráficos de alta resolução em carbonatos da Formação Sete Lagoas (Grupo Bambuí) apresentam grandes variações nas composições isotópicas de C, O e Sr. Os calcários impuros na base da unidade mostram valores primários de

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“…Pre vi ous stud ies have dem on strated that shal low ma rine car bon ates d 13 C val ues are not readily af fected by diagenetic al ter ations (Ban ner and Hanson, 1990). Con versely, d 18 O values of ma rine car bon ate rocks are eas ily in flu enced by burial and me te oric diagenesis (Brand and Veizer, 1981;Brand, 2004).…”

Section: Geochemical Signatures Of Meteoric Diagenesismentioning

confidence: 99%

“…The in verted J-curve de lin eated by Musayr sam ples is in dica tive of diagenetic al ter ation gov erned by vari able de grees of fluid-rock in ter ac tion and me te oric or i gin of diagenetic flu ids (e.g., Meyers and Lohmann, 1985;Lohmann, 1988;Ban ner and Hanson, 1990). This in verted trend may be as so ci ated with dif fer ent iso to pic equil i bra tion be tween car bon ate com po nents and diagenetic flu ids at low fluid rock in ter ac tions (Bishop et al, 2014; Fig.…”

Section: Geochemical Signatures Of Meteoric Diagenesismentioning

confidence: 99%

Geochemical signatures of pervasive meteoric diagenesis of Early Miocene syn-rift carbonate platform, Red Sea, NW Saudi Arabia

Al‐Ramadan

2016

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Al-Ramadan, K., 2017. Geo chem i cal sig na tures of per va sive me te oric diagenesis of Early Mio cene syn-rift car bon ate platform, Red Sea, NW Saudi Ara bia. Geo log i cal Quar terly, 61 (1): 239-250, doi: 10.7306/gq.1334 Dif fer ent diagenetic en vi ron ments have been rec og nized in the Early Mio cene car bon ate plat form of Musayr For ma tion in the Red Sea rift area. Early ma rine diagenesis in cludes micritisation that oc curs as thin en ve lope around skel e tal and non-skel etal grains in low-en ergy mud dom i nated fa cies and isopachous fi brous cal cite in high-en ergy grain-dom i nated fa cies. Per vasive me te oric wa ter diagenesis re sulted in ce men ta tion of the car bon ates by coarse-crys tal line blocky-drusy cal cite and me nis cus ce ments. De ple tion of ox y gen (avg. -9.08‰), car bon (avg. -1.6‰) iso topes and trace el e ments con cen tra tions (avg. val ues of Fe: 1387 ppm; Mn: 1444 ppm; Sr: 419 ppm; Na: 1194 ppm) in con junc tion with neg a tive cor re la tion be tween Mn 2+ and ox y gen iso tope data sug gest vari able de grees of fluid-rock in ter ac tions and per va sive me te oric diagenesis. The for ma tion of me te oric diagenesis in the Musayr For ma tion can be ex plained by two sub se quent mech a nisms: (1) the presence of me te oric lenses dur ing the time of de po si tion might have been as so ci ated with ac tive fresh wa ter in put from the hinter land (NE) due to fall in the rel a tive sea level; (2) later up lift ep i sode dur ing Plio-Pleis to cene may have also con trib uted to the per va sive me te oric diagenetic al ter ations of the car bon ates of the Musayr For ma tion. The first mech a nism is sup ported by the ce ment stra tig ra phy where the blocky-drusy ce ments post date the me nis cus ce ment. The lat ter mech a nism seems to have more pro nounced ef fect on the al ter ation of Musayr car bon ate se quence by ob serv ing the occurence of late ce ments such as blocky cal cite in most of the sam ples. The im pact of me te oric diagenesis on the stud ied sam ples sug gest that dis solu tion is less se vere than ce men ta tion, hence the vis i ble po ros ity is very low. Un der stand ing the tim ing of me te oric diagenesis pro vides use ful in for ma tion about the res er voir qual ity dis tri bu tion in syn-rift car bon ate se quences.

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Calculation of simultaneous isotopic and trace element variations during water-rock interaction with applications to carbonate diagenesis

Cited by 999 publications

References 17 publications

Evolution of Neoproterozoic Wonoka–Shuram Anomaly-aged carbonates: Evidence from clumped isotope paleothermometry

Evolution of Neoproterozoic Wonoka–Shuram Anomaly-aged carbonates: Evidence from clumped isotope paleothermometry

C, O, and Sr isotopic variations in Neoproterozoic-Cambrian carbonate rocks from Sete Lagoas Formation (Bambuí Group), in the Southern São Francisco Basin, Brazil

Geochemical signatures of pervasive meteoric diagenesis of Early Miocene syn-rift carbonate platform, Red Sea, NW Saudi Arabia

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