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Statistical Approach for Classification of Dinosaur Eggs from the heyuan basin at the Northeast of Guangdong Province

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Acta Geologica Sinica(English Edition) 2012年第2期86卷 294-303页

作者： Kohei TANAKA LU Junchang LIU Yi HUANG Zhiqing Yoshitsugu KOBAYASHI HUANG Dong Darla K. ZELENITSKY Department of Geoscience University of Calgary Calgary T2N1N4 Canada Institute of Geology Chinese Academy of Geological Sciences Beijing 10037 China heyuan Museum Heyuan 517000 China Hokkaido University Museum Hokkaido University Sapporo 060-0810 Japan

The Zhutian and Dafeng formations （Upper Cretaceous） of the heyuan basin in northeastern Guangdong Province, China, have produced thousands of dinosaur eggs. Macromorphological features （egg diameter, egg shape, outer surface texture, and shell thickness） of 461 eggs were analyzed using non-destructive techniques and subjected to statistical analyses in order to assess their diversity and taxonomic affinities. Three types （1, 2 and 3） of eggs were discerned based on shape and outer surface morphology. Type 1 eggs are spherical to ellipsoidal in shape and have a rough surface. Three subtypes （Type 1-A-l, l-A-2, and l-B） are apparent from scatter plots and cluster analyses of egg diameters and shell thickness. Type 2 eggs are elongate with linear ornamentation on the surface, and are comparable to eggs that belong to the oofamily Elongatoolithidae. Type 3 eggs are elongate with a smooth surface, and are assigned to the oofamily Prismatoolithidae. Macromorphological features of the various egg types suggest that Type 1 could have been laid by ornithischian, sauropod or therizinosaur dinosaurs, Type 2 by oviraptorids, and Type 3 by troodontids. This study represents the first comprehensive statistical analysis of macrofeatures of dinosaur eggs, and reveals taxonomic diversity in the dinosaurs that were laying eggs in the Upper Cretaceous heyuan area heretofore unrecognized in skeletal remains.

关键词： dinosaur egg Nanxiong Group Late Cretaceous heyuan basin Guangdong China

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A Preliminary Study on the Red Beds in the Northern heyuan basin, Guangdong Province, China

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Acta Geologica Sinica(English Edition) 2005年第5期79卷 598-604页

作者： ZHANG Xianqiu LU Junchang BIAN Geguo QIU Licheng HUANG Dong YUAN Weiqiang China New Star （Guangzhou） Petroleum Corporation Sanshui Guangdong 528133 Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 Bureau of Geology and Mineral Resources of heyuan Heyuan Guangdong 517000 Institute of Cultural Relics and Archaeology Guangzhou Guangdong 510075 heyuan Museum HeyuanGuangdong 517000

The red beds of the northern heyuan basin （Guangdong Province, China） are more than 4,000 m thick. Based on the lithological characters, in ascending order these beds are divided into the Dafeng Formation, Zhutian Formation, and Zhenshui Formation of the Nanxiong Group, Shanghu Formation and Danxia Formation. The Nanxiong Group with relatively mature coarse clastic rocks attains about 2940 m in thickness. The Dafeng Formation is 837 m thick, consisting of conglomerates and sandy conglomerates; the Zhutian Formation, which is 1.200 m thick, consists of purplish red sandstone with gravels, poorly sorted sandstone, feldspathic quartzose sandstone banded granular conglomerate, siltstone, and sandy mudstone. The Zhutian Formation is rich in calcareous concretions. heyuannia （Oviraptoridae） and turtle fossils were found in this formation. The Zhenshui Formation deposited to a thickness of 900 m consists of coarse sediments, including granular conglomerate, and gravelly sandstone with well developed cross-beddings; the Shanghu Formation, which is 820 m thick, consists of purplish red granular conglomerate coarse sandstone intercalated with fine si^tstone; the Danxia Formation characterized by the Danxia ~andform is composed of coarse c^astic gravels and sandy gravels. The lower part of the Nanxiong Group whence dinosaur eggs and derived oviraptorosaurs come, belongs to the Late Cretaceous. No fossils are found in the Shanghu Formation or the Danxia Formation, but their stratigraphic order of superposition on the Nanxiong Group clearly shows their younger age.

关键词： heyuan basin red beds dinosaur eggs heyuannia （Oviraptoridae） Cretaceous Guangdong

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Two-episode Tectono-thermal Events of the heyuan Fault in Late Cretaceous and Oligocene and their Tectonic Implications, Southernmost South China Block

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Acta Geologica Sinica(English Edition) 2022年第2期96卷 447-459页

作者： WANG Qiangmao LI Hailong LI Tingdong DING Xiaozhong ZHEN Junwei ZHANG Min FAN Yanxia Chinese Academy of Geological Sciences Beijing 100037China School of Earth and Space Science Peking UniversityBeijing 100871China Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China Team-7 of Guangdong Bureau of Geology HuizhouGuangdong 516008China Team-935 of Guangdong Non-Ferrous Metals Geological Exploration Bureau HuizhouGuangdong 516001China

The heyuan Fault, is one of the main NE-trending faults in the southernmost South China Block and is close to the northernmost South China Sea to the south. The fault features multi-stage deformation and controlled the formation of late Cretaceous to Cenozoic basins. Based on detailed field investigations and comprehensive geochronological research, including zircon U-Pb, Rb-Sr isochron, zircon U-Th-He dating, two episodic tectono-thermal events are recognized. The first occurred during ~79 Ma to 66 Ma, which is characterized by large-scale quartz-fluid emplacement. The other occurred at ~34 Ma, which features the eruption of a set of basalts. The two events show a changing on material source from siliceous hydrotherm to basalt magma, supporting obvious lithospheric thinning of the southernmost South China Block, which shed light on the geological evolution and the interaction mechanisms between the SCB and the northern South China Sea since the Late Cretaceous.

关键词： tectono-thermal events heyuan Fault heyuan basin Guangdong Province South China Block South China Sea

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