High-resolution carbon isotope records and correlations of the lower Cambrian Longwangmiao formation (stage 4, Toyonian) in Chongqing, South China

Ren, Ying; Gao, Chonglong; Liang, Ting; Sun, Hong-Mei; Wu, Di; Zheng, Xiaowei

doi:10.1016/j.palaeo.2017.07.013

Cited by 24 publications

(21 citation statements)

References 61 publications

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“…The variable unit range from the −9.6‰ to −6.6‰, with five conspicuous, positive oscillations with the values of −7.3‰ at sample 17, −7.4‰ at sample 23, −6.3‰ at sample 31, and −6.6‰ at sample 27 and 37, respectively. The δ 18 O values of our study are generally consistent with the previous published data (Derry, Brasier, Corfield, Rozanov, & Zhuravlev, ; Gomez, Ogle, Astini, & Kalin, ; Guo et al, ; Ren et al, ).…”

Section: Resultssupporting

confidence: 93%

“…Toward the basinward, the karst cannot be observed in the Nanshanping section in the outer ramp. Previous study proposed that the exposed features were not recognized in the upper part of the Longwangmiao Formation at the Bandenggou section where it is around the lagoon of the inner ramp (Ren et al, ). Overall, the palaeokarst is widely distributed in the middle ramp on the Yangtze Platform.…”

Section: Resultsmentioning

confidence: 99%

“…The lagoon developed in the transitional zone between inner ramp and middle ramp, which indicated a relative low‐topography controlled by fault activity (Du et al, ; Fang et al, ). Hence, the exposed surface is not recognized in the Bandenggou Section which is around the lagoon (Ren et al, ). To the distal setting, the Nanshanping section was not exposed above the sea level when the relative sea‐level had fallen.…”

Section: Discussionmentioning

confidence: 99%

“…(e) Depositional model of carbonate ramp in the Yangtze Platform consisting of the inner slope, middle slope, and outer slope (Fang et al, ). Data from 1‐Bandenggou section: Ren et al (); data from 2‐Wangcun section: Zhu et al (); data from 3‐Zengjiayan and 4‐Jianshan section: Guo et al (); data from 5‐Well WN2 and 6‐Well K2: Chang et al (); data from 7‐C204 in Siberia: Brasier and Sukhov (); data from 8—Section 4 in Laurentia: Dilliard et al (); data from 9‐Penglaiba section in Tarim: Wang et al (); data from 10‐South Australia: Hall (); data from 10‐Loch Eriboll section in Scotland: Faggetter et al () [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Geological Settingsmentioning

confidence: 99%

“…The extinction of Redlichiid trilobites (Gondwana) and Olenellid trilobites (Laurentia) is termed the “ROECE” event as a global biotic event around the boundary between Series 2 and Series 3 in the Cambrian (Gabriela Mángano & Buatois, ; Zhuravlev & Wood, ). The “ROECE” event generally shows as a sharp negative δ 13 C oscillation at the transition between the Toyonian and Amgan stages on several continents (Bond & Grasby, ; Chang et al, ; Dilliard, Pope, Coniglio, Hasiotis, & Lieberman, ; Guo et al, ; Ren et al, ; Zhuravlev & Wood, ) and is mostly recoded in the transgressive successions (Bond & Grasby, ; Chang et al, ; Guo et al, ; Zhuravlev & Wood, ). However, some previous studies proposed that the ROECE extinction event corresponded to the regression coupled with karstification on the platform and could also be used to a correlation proxy (Dilliard et al, ).…”

Section: Introductionmentioning

confidence: 99%

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The eogenetic karst of the Cambrian Longwangmiao Formation in the Yangtze Platform: Implications for the eustatic and stratigraphic correlations of Toyonian (Cambrian)

Jia

Hai-qin

et al. 2018

Geological Journal

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To make a better understanding of the stratigraphic correlation and ocean processes during the transition from Series 2 to Series 3 in the Cambrian, this study investigated the characteristics and origin of the palaeokarst in the uppermost part of the Longwangmiao Formation (Toyonian) and established the carbon isotopic curves of the shallow‐water succession. Macroscopically, the palaeokarst features have been identified, including the exposed surface, karstic trough, discolouration, and breccia in the upper part of the Longwangmiao Formation. The exposed surface is divided into the bedrock, weakly weathering zone, intensely weathering zone, dissolved‐collapsed zone, and weathering clay layer at the Dingzhai section. The reddish aluminous oxide and the stratiform‐dissolved pore are recognized in the Gaodongmiao section. The clast‐support breccia and matrix‐support breccia develop in the palaeokarst zone. Microscopically, three dissolution‐filling zones in grainstone (the matrix zone, half‐dissociated zone, and mixed‐filling zone) dissolved fibrous cement in the early diagenetic stage, microspar cement in a bright homogeneous luminescence, and medium‐crystal calcite showing a zonation luminescence are identified indicating the facies‐controlled attributes. The δ13C values are characterized by a lower range (4.4‰ to −2.1‰) in the karst zone. The REE pattern shows enriched middle REE, negative Eu anomalies, and low Y/Ho ratio, which is different from the nature of seawater. It is proposed that the palaeokarst in the upper part of the Longwangmiao Formation is the eogenetic karst controlled by high‐frequency sea‐level fluctuations. Two negative δ13C excursions (values −4.4‰ in D2 and −3.6‰ in D1) are respectively recognized, the top boundary and middle part of the Longwangmiao Formation. Based on the regional and global correlations, the excursion of D2 is the diagenetic signal in the shallow‐water setting, which correlated to ROECE event (Redlichiid‐Olenellid Extinction Carbon isotope Excursion) that occurred around the boundary between Series 2 and Series 3 in the Cambrian. The local signal of D2 is attributed to the sea‐level falling.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Geological Settingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The eogenetic karst of the Cambrian Longwangmiao Formation in the Yangtze Platform: Implications for the eustatic and stratigraphic correlations of Toyonian (Cambrian)

Jia

Hai-qin

et al. 2018

Geological Journal

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Was the Kalkarindji Continental Flood Basalt Province a Driver of Environmental Change at the Dawn of the Phanerozoic?

Marshall

Faggetter

Widdowson

2021

Geophysical Monograph Series

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The Kalkarindji continental flood basalt province of Northern Australia is the oldest basaltic LIP in the Phanerozoic having erupted in the mid-Cambrian. At this time, during the Cambrian Explosion, the global environment suffered a series of mass extinctions and biotic turnover. Kalkarindji had the potential to release 1.65 x 10 6 Tg of CO 2 , approximately 1.72% of the total Cambrian atmospheric carbon reservoir. It has there fore been implicated as a driver of the environmental changes in the Cambrian Series 2. However, temporal discrepancies between Kalkarindji eruptions and biotic turnover may prevent this LIP from being attributed as the sole cause of the Botomian-Toyonian Extinction, which wiped out up to 45% of all genera in the fossil record; while environmental factors such as sea-level change causing ocean anoxia are implicated in the Redlichiid-Olenellid Extinction. It is certainly possible that Kalkarindji could have played a part in forcing these environmental changes, but further advances in geochronology and sedimentary volcanic proxies are needed to confidently define a direct causational link between these events at the dawn of the Phanerozoic.

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Origin of dolomite of the lower Cambrian Longwangmiao Formation, eastern Sichuan Basin, China

Ren

Gao

Sun

et al. 2017

Carbonates Evaporites

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High-resolution carbon isotope records and correlations of the lower Cambrian Longwangmiao formation (stage 4, Toyonian) in Chongqing, South China

Cited by 24 publications

References 61 publications

The eogenetic karst of the Cambrian Longwangmiao Formation in the Yangtze Platform: Implications for the eustatic and stratigraphic correlations of Toyonian (Cambrian)

The eogenetic karst of the Cambrian Longwangmiao Formation in the Yangtze Platform: Implications for the eustatic and stratigraphic correlations of Toyonian (Cambrian)

Was the Kalkarindji Continental Flood Basalt Province a Driver of Environmental Change at the Dawn of the Phanerozoic?

Origin of dolomite of the lower Cambrian Longwangmiao Formation, eastern Sichuan Basin, China

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