Terrestrial records of the early Albian Ocean Anoxic Event: Evidence from the Fuxin lacustrine basin, NE China

Xu, Xiaotao; Shao, Longyi; Eriksson, Kenneth A.; Pang, Bo; Wang, Shuai; Yang, Cheng‐Xue; Hou, Haihai

doi:10.1016/j.gsf.2021.101275

Cited by 20 publications

(22 citation statements)

References 74 publications

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“…An epicontinental sea site in the Fuxin Basin (China) presents a 58.33 m‐thick Kilian level. In addition, TOC concentrations at the Sítio Sobradinho outcrop are much higher (∼12%) than those at the PLG section (∼1%: Sabatino et al., 2018), at the Vocontian Basin (∼3%: Herrle et al., 2004), and even those in the Fuxin Basin (∼5%: Xu et al., 2022).…”

Section: Discussionmentioning

confidence: 94%

“…Chronostratigraphically, early cyclostratigraphic studies have placed the 113/Jacob, Kilian, and Paquier/Urbino events at ∼36 (∼115.1 Ma), 31 (∼113.1 Ma), and 26.5 (∼111.2 Ma) long‐eccentricity (405 Kyr) cycles, respectively, prior to the base of the Cenomanian (100.5 Ma) (Grippo et al., 2004). Recent astronomical calibrations have provided ages of ∼112.9 Ma (Leandro et al., 2022) and ∼113.5 Ma (Fauth et al., 2022) for the Kilian subevent, although independent radiometric dating suggest slightly younger ages (112.6 ± 1.7, and 112.4 ± 0.3 Ma: Herrle et al., 2015; Xu et al., 2022; Zhao et al., 2022) for the onset of the subevent. Radiometric dating of the Paquier/Urbino subevent (111.2 Ma: Herrle et al., 2015) confirmed the age suggested by the astronomical calibration of Grippo et al.…”

Section: Introductionmentioning

confidence: 99%

“…The Aptian‐Albian Boundary Interval (AABI: ∼113.2 Ma; Huber & Leckie, 2011; Gale et al., 2020) was marked by exceptionally warm climatic conditions, and extensive formation of organic‐rich laminated “black shales” in oceanic environments (Coccioni et al., 2014; Huber et al., 2018). Increased temperatures, driven by high atmospheric carbon dioxide (CO 2 ) levels, led to sluggish overturning circulation and reduced deep ocean ventilation, as well as increased precipitation rates, nutrient delivery, and organic carbon burial in marine and continental settings (e.g., Herrle et al., 2004; Leckie et al., 2002; Xu et al., 2022; Zhao et al., 2022). As a result, extensive deposition of black shale successions occurred, often associated with distinctive negative stable carbon isotope (δ 13 C) excursions (nCIEs).…”

Section: Introductionmentioning

confidence: 99%

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Fossil‐Bearing Concretions of the Araripe Basin Accumulated During Oceanic Anoxic Event 1b

Bom,

Kochhann,

Heimhofer

et al. 2023

Paleoceanog and Paleoclimatol

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Fossils from the Araripe Basin (northeastern Brazil) are known for their remarkable preservation of vertebrates and invertebrates, even including soft tissues. They occur in carbonate concretions within organic carbon‐rich strata assigned to the Romualdo Formation. Here we present integrated stable isotope, elemental and microfossil records from the Sítio Sobradinho outcrop, Araripe Basin, northeastern Brazil. Our results imply that black shales hosting fossil‐bearing carbonate concretions within the lower Romualdo Formation were deposited during Oceanic Anoxic Event (OAE) 1b (Kilian sub‐event). Our high‐resolution multi‐proxy approach allows identifying four phases of environmental evolution. After a pre‐event phase, an early phase (onset of the negative carbon isotope excursion—nCIE) of water column stratification and reduced oxygenation likely preconditioned the system for organic carbon burial and preservation. A second phase (peak nCIE) was characterized by an intensified hydrological cycle and continental runoff, as well as increased influx of terrestrial organic matter. High input of continent‐derived nutrients might have enhanced biological productivity in the epicontinental sea, ultimately leading to increased organic carbon fluxes and burial, as well as carbonate dissolution at the seafloor. All together, these paleoenvironmental conditions resulted in expansion of an oxygen minimum zone (OMZ), favoring taphonomic processes that led to the excellent preservation of diverse macro‐ and microfossils. The nCIE recovery phase was characterized by reduced nutrient supply and organic carbon burial. Organic carbon sequestration in such paleoenvironments likely contributed to the recovery (increase) of stable carbon isotope (δ13C) records in the deep ocean during the Kilian sub‐event of OAE 1b.

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Section: Discussionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fossil‐Bearing Concretions of the Araripe Basin Accumulated During Oceanic Anoxic Event 1b

Bom,

Kochhann,

Heimhofer

et al. 2023

Paleoceanog and Paleoclimatol

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“…In this model, more attention is paid to the effects of reduction conditions and the reduction of oxidation decomposition of sinking organic particles on the enrichment of organic matter. , However, with the further development of oil and gas exploration, these two organic matter accumulation models are not fully applicable in some areas, which makes researchers begin to pay attention to the influence of terrigenous input on organic matter accumulation . However, there is no consensus as to whether terrigenous input is beneficial to the accumulation of organic matter in the strata, but it has been widely recognized by researchers that it will affect the accumulation of organic matter. ,, …”

Section: Introductionmentioning

confidence: 99%

“…16 However, there is no consensus as to whether terrigenous input is beneficial to the accumulation of organic matter in the strata, but it has been widely recognized by researchers that it will affect the accumulation of organic matter. 3,17,18 T h i s c o n t e n t i s The Qiannan Depression is located in the Upper Yangtze Plate, where a set of organic-rich shales of the Lower Carboniferous Dawuba Formation is deposited in the platform basin facies, 19,20 and it is the main hydrocarbon source rock in Southwest China. 21,22 Previous studies show that the shale of the Dawuba Formation is characterized by the low content of brittle minerals, high content of clay minerals, high maturity (between 2.0 and 3.0), and relatively high abundance of organic matter (generally greater than 2.0), thus providing favorable conditions for shale oil and gas enrichment.…”

Section: Introductionmentioning

confidence: 99%

Main Controlling Factors and Models of Organic Matter Accumulation in Lower Carboniferous Dawuba Formation Shale in Southern Guizhou, China

et al. 2021

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A set of high-quality marine facies organic-rich shales developed in the Lower Carboniferous Dawuba Formation, which is considered to be the main target of shale gas exploration and development in Guizhou Province. In this paper, 53 samples from Well ZY1 are selected, and the core observation data, field-emission scanning electron microscopy (FE-SEM) images, and geochemical data of these samples are analyzed. On the basis of these data, the main influencing factors of organic matter enrichment in the Dawuba Formation shale were identified and an organic matter accumulation model was established. The results show that total organic carbon (TOC) values of the Dawuba Formation in the ZY1 well vary between 1.97 and 4.11%, with high values appearing at the depths of 2796−2814 m (3.00−4.11) and 2877−2894 m (1.97−3.49). The redox-sensitive element enrichments are generally low, indicating that these samples were deposited under oxic−suboxic conditions. The micronutrients (Zn, Cu, and Ni), biological Ba (Ba XS ), and P/Al also show low values, indicating low primary productivity. The chemical index of alteration (CIA) and terrigenous clastic input index (Ti/Al) showed two obvious high-value zones, indicating that shale in the study area was affected by terrigenous inputs. Similarly, the calculation results show that Fe/Mn and Rb/K values have two abnormal data segments at the same depth. The anomaly of these data at the same depth section further suggests that the shale was affected by terrigenous input during deposition. Moreover, the terrigenous input reaches the maximum in the above TOC high-value region, and it is inferred by combining with the core observation results that the gravity flow occurs in this depth. The carbon isotope of kerogen (δ 13 C org ) ranges from −26.84 to −24.36%, indicating that the source of organic matter is likely to be terrestrial plants. This is further supported by the widespread presence of filamentous organic matter using FE-SEM, despite the low productivity and poor preservation conditions during deposition of the Dawuba Formation; the enhanced terrigenous input may have provided additional sources of organic matter for the Dawuba shale.

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Hydrocarbon generation and migration in the Fuxin Basin during the Cretaceous evolution of the North China Craton, NE China

Xie,

Jia,

Mansour

et al. 2023

Geomech. Geophys. Geo-energ. Geo-resour.

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The extensive thinning and destruction of North China Craton (NCC) during the Early Cretaceous led to the development of numerous rift basins and petroleum systems. However, the specific relationship between NCC evolution and hydrocarbon generation and accumulation in these sedimentary basins is still unclear. In this study organic geochemistry and oil-source correlation analyses were conducted to investigate the hydrocarbons generation potential and migration pathway in the representative Fuxin Basin. Results demonstrate that the semi-deep lacustrine source rocks were developed in the Jiufotang Formation (K1jf) in the west and the upper Shahai Formation (K1sh) in the east, both of which are enriched with organic matter content and hydrocarbon generation potential of kerogen Types II to III. Based on the hierarchical cluster analysis of crude oils biomarker fingerprints, two crude oil types (A and B) were deduced. The Type A crude oil is characterized by high gammacerane, low pristane/phytane, relatively high C29 regular sterane and methylphenanthrene index, which is consistent with the K1jf biomarker characteristics in the west. Therefore, the Type A crude oil is likely generated from the K1jf source rock that accumulated in turbidite sand bodies of the K1jf and/or migrated to the K1sh reservoir through strike-slip faults. Type B crude oil is dominated by low gammacerane, moderate pristane/phytane, high C27 regular sterane and 1,2,5-trimethylnaphthalenes, which is in good agreement with the K1sh4 features. The basin simulation revealed that hydrocarbon generation of source rocks in the Jiufotang and Shahai formations was linked to a rapid subsidence of the basin, which was induced by intense extension with the NCC destruction during the Early Cretaceous. Subsequently, the rapid subduction of the Western Pacific plate during the earliest Late Cretaceous led to the development of extensive epigenetic fractures, enabling extensive hydrocarbon migration in the Fuxin Basin. This study sheds light on oil sources in sedimentary basins in an extensional setting and provides insights into the dynamic process of hydrocarbon generation and migration associated with NCC evolution.

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Terrestrial records of the early Albian Ocean Anoxic Event: Evidence from the Fuxin lacustrine basin, NE China

Cited by 20 publications

References 74 publications

Fossil‐Bearing Concretions of the Araripe Basin Accumulated During Oceanic Anoxic Event 1b

Fossil‐Bearing Concretions of the Araripe Basin Accumulated During Oceanic Anoxic Event 1b

Main Controlling Factors and Models of Organic Matter Accumulation in Lower Carboniferous Dawuba Formation Shale in Southern Guizhou, China

Hydrocarbon generation and migration in the Fuxin Basin during the Cretaceous evolution of the North China Craton, NE China

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