Discovery of Pseudofrenelopsis from the Lower Cretaceous of Liupanshan Basin and its paleoclimatic significance

Du, Baoxia; Zhang, Mingzhen; Dai, Shuang; Sun, Bainian

doi:10.1016/j.cretres.2013.12.003

Cited by 22 publications

(11 citation statements)

References 20 publications

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“…The Zhonggou Formation consists of the calcareous-clastic sedimentary rock with a grayish green color . According to the lithological and palaeobiological characteristics, the upper unit of Zhonggou Formation was divided into six members (Sun et al, 2013;Du et al, 2014;Du et al, 2016). The present fossil specimens were found in five depositional members (member 2-6).…”

Section: Geological Settingsmentioning

confidence: 94%

“…According to the single zircon U-Pb dating, the age of the Zhonggou Formation is about 115.0±4.5 Ma (Li et al, 2013). When combined with the assemblages of macro-fossils and spore -pollen (Deng et al, 2005;Deng Shenghui and Lu Yuanzheng, 2008;Du et al, 2014Du et al, , 2016Zheng et al, 2015;Zhang et al, 2015), the age of the Zhonggou Formation is probably late Aptian to early Albian.…”

Section: Geological Settingsmentioning

confidence: 99%

“…The present fossil plants were assigned to the Brachyphyllum variant based on morphological and micromorphological structures, which were studied carefully (Du et al, 2014). Some of the Brachyphyllum specimens were well preserved with cuticles.…”

Section: Plant Materialsmentioning

confidence: 99%

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Middle Cretaceous pCO₂ Variation in Yumen, Gansu Province and its Response to the Climate Events

Lei

et al. 2018

Acta Geologica Sinica (Eng)

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The palaeo‐atmospheric CO2 concentration (pCO2) variation in the Yumen, Gansu Province during the middle Cretaceous has been reconstructed using the newly established plant photosynthetic gas exchange mechanistic model, and the results show that the pCO2 values are in the range of about 550–808 ppmv. The present pCO2 values are higher than the pCO2 results (531–641 ppmv) of the previous study according to the Recent standardization of the stomatal ratio method, and much lower than the pCO2 results (882–1060 ppmv) according to the Carboniferous standardization of the stomatal ratio method. The present pCO2 variation is not only within the error range of GEOCARB II and GEOCARB III but also is similar to the reconstructed results based on the biochemistry and carbon isotope models. Besides, the present Brachyphyllum specimens were collected from four consecutive horizons of the upper Zhonggou Formation of the Hanxia Section, and the reconstructed pCO2 exhibits the reconstructed pCO2 exhibits a decline trend during the late Aptian to early Albian. This decline variation is probably associated with the Oceanic Anoxic Events (OAE1b) and the Cold snap event. With the combination of pCO2 during the Albian to Cenomanian recovered by the plant photosynthetic gas exchange mechanistic model, the pCO2 showed a prominent increase during the late Aptian to early Cenominian, which indicates a response to the greenhouse warming during the middle Cretaceous. Therefore, the mechanical model of the plant photosynthetic gas exchange shows a relatively strong accuracy in the reconstruction of the pCO2 and can reflect a strong relation between the atmospheric CO2 concentrations and climatic events.

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Section: Geological Settingsmentioning

confidence: 94%

Section: Geological Settingsmentioning

confidence: 99%

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Middle Cretaceous pCO₂ Variation in Yumen, Gansu Province and its Response to the Climate Events

Lei

et al. 2018

Acta Geologica Sinica (Eng)

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“…The Liupanshan Basin is at the border of the Gansu and Ningxia provinces, China and is filled with 1500-m thick fluvial and lacustrine sediments that are upward divided into the Sanqiao, Heshangpu, Liwaxia, Madongshan, and Naijiahe formations. To date, abundant palynomorphs, ostracoda, and plant megafossils have been found in the basin covering Barremian to Albian (Qi Hua, 1987;Li Zuwang, 1995;Li Jianguo and Du Baoan, 2006;Du et al, 2014). In addition, Dai Shuang et al (2009) reported highresolution magnetostratigraphic data that suggest a long normal polarity zone for the Liwaxia to Naijiahe formations.…”

Section: Late Barremian-albian Climate In Western China Central Eastmentioning

confidence: 99%

“…Besides the high Classopollis content, xerophilous Ephedripites increase upward in the section, suggesting aridification. To date, the plant megafossils discovered in the basin are xerophilous Pseudofrenelopsis (Cheirolepidiaceae) (Du et al, 2014). Their papilliform and thick cuticles suggests arid environment.…”

Section: Late Barremian-albian Climate In Western China Central Eastmentioning

confidence: 99%

Mid‐Cretaceous Hothouse Climate and the Expansion of Early Angiosperms

Zhang

Dai

et al. 2018

Acta Geologica Sinica (Eng)

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The remarkable transition of early angiosperms from a small to a dominant group characterized the terrestrial ecosystem of the Cretaceous. This transition was instigated and promoted by environmental changes. Mid‐Cretaceous is characterized by major geological events that affected the global environment. δ18O, palaeothermometer TEX86, and other climatic indices from marine sediments suggest rapid temperature increase during mid‐Cretaceous despite occasional short cooling events. Simultaneously, terrestrial deposits in East Asia changed from coal‐bearing to shale, then to red beds and evaporites. Plant assemblages and other paleoclimate indicators point to rapid aridification for mid‐Cretaceous terrestrial environments. In addition, the wildfires were frequently spread all over the earth by the numerous charcoal evidence during the Mid‐Cretaceous. Thus, we speculate that the seasonally dry and hot conditions of mid‐Cretaceous created a fiery hothouse world. Early angiosperms increased in abundance and diversity and evolved from a few aquatic species to terrestrial herbaceous and then to the diversified flora of today. Angiosperms showed rapid physiological evolution in vein density and leaf area that improved photosynthesis and water absorption. These ecophysiological changes made early angiosperms well adapted to the hot and dry environment in mid‐Cretaceous. Moreover, these physiological changes facilitated the fire–angiosperm cycles in mid‐Cretaceous that likely further stimulated the early angiosperm evolution.

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Fossil Pagiophyllum from the Lower Cretaceous of Jiuquan Basin, Gansu Province, and its palaeoenvironmental implications

Lei

et al. 2021

Geological Journal

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Pagiophyllum compressum (Deng and Lu) was described based on the leaf morphological and cuticular features from the Lower Cretaceous (late Aptian—early Albian) Zhonggou Formation of Jiuquan Basin, Gansu Province, North‐west China. P. compressum has helically and tightly arranged leaves appressed on the ultimate shoots, which are imbricated shapes. The epidermal cells are square or rectangular, without papillae on the periclinal walls. The stomatal apparatus is elliptic and composed of 4–7 subsidiary cells arranged in two or three longitudinal rows on the middle part of the leaves. The present specimens may be related to Araucariaceae based on the cluster analysis of morphological features. By summarizing the global distribution of the Pagiophyllum in the Late Jurassic and Cretaceous, it has been found that Pagiophyllum can live in both tropical‐equatorial hot arid belt and humid climate zone of middle and high latitudes, confirming that Pagiophyllum has an extensive habitat.

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Discovery of Pseudofrenelopsis from the Lower Cretaceous of Liupanshan Basin and its paleoclimatic significance

Cited by 22 publications

References 20 publications

Middle Cretaceous pCO₂ Variation in Yumen, Gansu Province and its Response to the Climate Events

Middle Cretaceous pCO₂ Variation in Yumen, Gansu Province and its Response to the Climate Events

Mid‐Cretaceous Hothouse Climate and the Expansion of Early Angiosperms

Fossil Pagiophyllum from the Lower Cretaceous of Jiuquan Basin, Gansu Province, and its palaeoenvironmental implications

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Discovery of Pseudofrenelopsis from the Lower Cretaceous of Liupanshan Basin and its paleoclimatic significance

Cited by 22 publications

References 20 publications

Middle Cretaceous pCO2 Variation in Yumen, Gansu Province and its Response to the Climate Events

Middle Cretaceous pCO2 Variation in Yumen, Gansu Province and its Response to the Climate Events

Mid‐Cretaceous Hothouse Climate and the Expansion of Early Angiosperms

Fossil Pagiophyllum from the Lower Cretaceous of Jiuquan Basin, Gansu Province, and its palaeoenvironmental implications

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Product

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Middle Cretaceous pCO₂ Variation in Yumen, Gansu Province and its Response to the Climate Events

Middle Cretaceous pCO₂ Variation in Yumen, Gansu Province and its Response to the Climate Events