Late Cretaceous Aquatic Angiosperms from Jiayin, Heilongjiang, Northeast China

Quan, Cheng; Sun, Ge

doi:10.1111/j.1755-6724.2008.tb00713.x

Cited by 17 publications

(2 citation statements)

References 11 publications

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“…The fossils were accompanied by abundant Tempskya trunks (Yang et al, 2018), fern stems of the Cyatheaceae (Cheng and Liu, 2017;Cheng and Yang, 2018), some gymnosperm woods and a few angiosperm woods (Cheng et al, 2021a). In addition, stem and petiole base fossils of the Osmundaceae were found in the area near Keshan (Cheng et al, 2019(Cheng et al, , 2020(Cheng et al, , 2021b.…”

Section: Methodsmentioning

confidence: 99%

Anatomical Study of Cretaceous, Permineralized, Bennettitalean Fossils from Heilongjiang Province, NE China

Xiaonan

Cheng

2022

Acta Geologica Sinica (Eng)

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Well-preserved Cretaceous trunk fragments of Cycadeoidea (Cycadeoidaceae) were recently found in Keshan County, Heilongjiang Province, Northeast China. These fossils represent important evidence of the distribution of this group of plants in East Asia. In these trunk fragments, the stem cortices and leaf bases with cones are preserved. The leaf bases are rhombic with cones infrequently distributed among leaf bases. The cortex is broad and consists of fundamental parenchyma cells, numerous secretory ducts and C-shaped leaf traces with adaxial secondary xylem and abaxial secondary phloem. The genus Cycadeoidea, which is widely distributed in the Cretaceous deposits of East Asia, North America and Western Europe, was an important component of Cretaceous floras. Bennettitalean trunk fossils with well-preserved anatomical structures are rarely known from China. These fossils are important for studies of the evolution of genus Cycadeoidea and for stratigraphic correlation.

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Section: Methodsmentioning

confidence: 99%

Anatomical Study of Cretaceous, Permineralized, Bennettitalean Fossils from Heilongjiang Province, NE China

Xiaonan

Cheng

2022

Acta Geologica Sinica (Eng)

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“…Ocean and combined with the rock assemblage and spatial distribution of the Early Cretaceous rocks, we suggests that the magmatism in the study area also formed in the subduction setting of the Mongolia-Okhotsk Ocean. However, considering that the evolution of the Palaeo-Pacific Ocean at this time (Han & Zhou, 2020;Cheng et al, 2006), the evolution of the Palaeo-Pacific Ocean may have been subducted again.…”

Section: Petrogenesis and Magma Sourcementioning

confidence: 99%

Igneous records of transformation from ocean to continent of Mongolia–Okhotsk Ocean: Evidence from granitoids of Woduhe area, Heilongjiang Province, China

Liu

Deng

et al. 2023

Geological Journal

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The Woduhe area of Heilongjiang Province is located in the eastern side of the Greater Xing'an Range. This area has experienced the evolution of the Palaeo‐Asian Ocean, the Palaeo‐Pacific, and the Mongolia–Okhotsk Ocean, and it can be used to discuss the transformation process of these palaeo‐oceanic plates to continental plates. However, controversies exist over its time period and the process of transformation. The 1:250000 Woduhe Geological Map shows that Early Cretaceous granitic batholith developed near the Dajinshan area. However, the LA‐ICP‐MS zircon U–Pb dating presented in this paper shows that the trondhjemites from the southern part of the Dajinshan area were formed at 156.9 ± 2.2 Ma, syenogranites were formed at 131.7 ± 1.6 Ma, and diorite porphyrite dikes were formed at 126.0 ± 3.1 Ma. Therefore, Early Cretaceous batholiths should be reclassified as different, separate units. The Late Jurassic intrusive rocks belong to TTGG assemblages (tonalite–trondhjemite–granodiorite‐granite). Trace element spider diagrams show that the rocks are enriched in K, Pb, Zr, and Hf; depleted in Nb, Ta, and Eu; with higher Sr; and lower Y content. The rare earth element pattern is right‐sloping (La/Yb > 12). The Early Cretaceous intrusive rocks belong to G assemblages (granodiorite). Combined with the tectonic settings, we determined that the Late Jurassic and the Early Cretaceous granites were formed in a magmatic arc setting related to subduction. Late Jurassic intrusive magma mainly originated from the partial melting of the thickened lower crust under the Xing'an arc, and was likely contaminated by mantle material. Early Cretaceous intrusive magma originated from the partial melting of the Xing'an sub‐arc crust. Based on the distribution of the Late Jurassic TTG (N and NE) and G (S and SW) assemblages, intrusive records of the southward and southwestward subduction of the Mongolia–Okhotsk Ocean can be observed. In addition, the grade of maturity of the Xing'an arc is increasing during Late Jurassic to Early Cretaceous.

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Trend of Santonian (Late Cretaceous) atmospheric CO2 and global mean land surface temperature: Evidence from plant fossils

Wan

De-hai

Zhan-ping

et al. 2011

Sci. China Earth Sci.

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Quantitative reconstructions of atmospheric CO 2 by using terrestrial and marine records are critical for understanding the so-called "greenhouse" conditions in the Cretaceous, but data from terrestrial plants for several stages of this period remain quite limited. Using the stomatal index (SI) technique, here we estimate the Santonian (Late Cretaceous) CO 2 contents based on a sequence of fossil cuticles of Ginkgo adiantoides (Ung.) Heer from three beds of the Yong'ancun Formation in Jiayin, Heilongjiang Province, northeastern China. By the regress function, SIs of Ginkgo fossils reveal a pronounced CO 2 reduction from the early to late Santonian (~661 and ~565 ppm, respectively). The relatively high CO 2 levels provide additional evidence for paleoclimatic warmth in this interval. Moreover, available paleobotanical data illustrate a decline trend of CO 2 contents throughout the Late Cretaceous, punctuated by several fluctuations in particular episodes with different magnitudes. The CO 2 contents shifted notably in the late Cenomanian, Turonian, early Santonian, late Campanian, and probably latest Maastrichtian. Furthermore, a comprehensive study based on CO 2 data shows that the global mean land surface temperature (GMLST) fluctuated several times accordingly. The change ratios of GMLST (ΔT) increased from ~3°C in late Cenomanian to ~4.7°C in mid Turonian, and then dramatically reduced to ~2.2°C in mid Coniacian. From the Santonian onward, it appears that the temperature gradually decreased with a few minor fluctuations. Santonian, Late Cretaceous, global mean land surface temperature, stomatal index, Yong'ancun Formation, JiayinCitation:Wan C B, Wang D H, Zhu Z P, et al. Trend of Santonian (Late Cretaceous) atmospheric CO 2 and global mean land surface temperature: Evidence from plant fossils.

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Late Cretaceous Aquatic Angiosperms from Jiayin, Heilongjiang, Northeast China

Cited by 17 publications

References 11 publications

Anatomical Study of Cretaceous, Permineralized, Bennettitalean Fossils from Heilongjiang Province, NE China

Anatomical Study of Cretaceous, Permineralized, Bennettitalean Fossils from Heilongjiang Province, NE China

Igneous records of transformation from ocean to continent of Mongolia–Okhotsk Ocean: Evidence from granitoids of Woduhe area, Heilongjiang Province, China

Trend of Santonian (Late Cretaceous) atmospheric CO2 and global mean land surface temperature: Evidence from plant fossils

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