Palynology of the Early Cretaceous Hanxia Section in the Jiuquan Basin, Northwest China: The discovery of diverse early angiosperm pollen and paleoclimatic significance

Zhang, Mingzhen; Ji, Liming; Du, Baoxia; Dai, Shuang; Hou, Xuewen

doi:10.1016/j.palaeo.2015.09.010

Cited by 39 publications

(22 citation statements)

References 30 publications

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“…The Chijinbao, Xiagou, and Zhonggou formations are part of the Jiuquan Basin. Abundant fossils include palynomorphs and Ostracoda that suggest Barremian to Albian ages (Hu Yanxia, and Xu Donglai, 2005;Zhang et al, 2015). It is crucial that volcanic rocks are found at the boundary of the Xiagou and the Zhonggou formations.…”

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

confidence: 99%

“…Xerophytic Cherirolepidiaceae, such as Pseudofrenolopsis and Brachyphyllum, are abundant in the megafossil plant assemblages (Deng Shenghui and Lu Yuanzheng, 2008;Du et al, 2013;Lei et al, 2018;Jin et al, 2017). Classopollis with Cherirolepidiaceae affinity distinctly increase in the Albian Zhonggou Formation (Zhang et al, 2015). Therefore, relatively dry climate is suggested to have prevailed during Albian in the Jiuquan Basin.…”

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

confidence: 99%

“…The tricolpate pollen have affinities with eudicots, in agreement with megafossils. Actually, the tricolpate pollen constitutes various morphological types, such as the reticulated or ribbed exine, fusiform, and oval and subsphaeroidal forms, that resemble pollen from "dicots" (see Zhang et al, 2015;Heimhofer et al, 2007;James and Robbins, 1977). Therefore, the early angiosperm pollen assemblages in Albian are remarkably diverse.…”

Section: Mid-cretaceous Angiosperm Pollenmentioning

confidence: 99%

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

confidence: 99%

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

confidence: 99%

Section: Mid-cretaceous Angiosperm Pollenmentioning

confidence: 99%

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Mid‐Cretaceous Hothouse Climate and the Expansion of Early Angiosperms

Zhang

Dai

et al. 2018

Acta Geologica Sinica (Eng)

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“…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%

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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“…Early Cretaceous reports from other regions shows that although pantoporate pollen are not common they were already geographically widespread in the Aptian with occurrences in Egypt and Columbia (Ibrahim et al 2017) and by the Albian pantoporate pollen grains are diverse and almost global in distribution with occurrences in areas such as the former SSSR, Portugal, Egypt, Qatar, Sudan, Morocco, Tanzania, western Equatorial Africa, eastern North America, Brazil, Peru, and western China (e.g. Herngreen 1973;Chlonova 1986;Ibrahim et al 2017;Zhang et al 2015;Ferreira et al 2016;Horikx et al 2016). …”

Section: Comparison Of Paisia Pantoporata With Early Cretaceous Flowementioning

confidence: 99%

Paisia, an Early Cretaceous eudicot angiosperm flower with pantoporate pollen from Portugal

Friis

Mendes

Pedersen

2017

Grana

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Palynology of the Early Cretaceous Hanxia Section in the Jiuquan Basin, Northwest China: The discovery of diverse early angiosperm pollen and paleoclimatic significance

Cited by 39 publications

References 30 publications

Mid‐Cretaceous Hothouse Climate and the Expansion of Early Angiosperms

Mid‐Cretaceous Hothouse Climate and the Expansion of Early Angiosperms

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

Paisia, an Early Cretaceous eudicot angiosperm flower with pantoporate pollen from Portugal

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Palynology of the Early Cretaceous Hanxia Section in the Jiuquan Basin, Northwest China: The discovery of diverse early angiosperm pollen and paleoclimatic significance

Cited by 39 publications

References 30 publications

Mid‐Cretaceous Hothouse Climate and the Expansion of Early Angiosperms

Mid‐Cretaceous Hothouse Climate and the Expansion of Early Angiosperms

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

Paisia, an Early Cretaceous eudicot angiosperm flower with pantoporate pollen from Portugal

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