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2. Distribution and Characteristics of Dinosaur Eggs in China

Author

Hao Qingqing, Liu Lian, Hao Ziguo, and Fei Hongcai

Subjects
010506 paleontology, Paleontology, business.industry, Distribution (economics), Geology, 010502 geochemistry & geophysics, business, China, 01 natural sciences, 0105 earth and related environmental sciences
Published
2016

16. Geology, Geochemistry, and Geochronology of the Fenghuangshan Skarn-type Copper Deposit in the Tongling Ore Cluster, Anhui Province, East China

Author

Qu Hongying, Wang Haolin, LI Jinwen, Fei Hongcai, Pei Rongfu, Yao Lei, and Wang Yonglei

Subjects
Basalt, Molybdenite, Geochronology, Geochemistry, Geology, Skarn, Crust, Radiometric dating, Quartz, Zircon
Abstract

The Fenghuangshan skarn-type Cu deposit, Tongling Ore Cluster, Anhui Province, is an important component in the Middle—Lower Yangtze River ore-forming belt. To better understand magmatism and its relationship to mineralization, we investigated geochemical features, ore-forming fluids, and geochronology of the Xinwuli intrusion and the related Fenghuangshan Cu deposit. Lithogeochemical characteristics show that the Xinwuli quartz monzodiorite is formed by mixing magma derived from upper mantle alkaline basalt that has been contaminated by crust materials. C, H and O isotopes indicate that ore-forming fluids mainly come from the magma, with minor amounts of meteoric fluids involved at the late stage. S and Pb isotopic components indicate that ore-forming materials are derived from the mantle. Molybdenite Re—Os isotopic dating yields Re—Os model ages ranging from 139.1±2.4 Ma to 142.0±2.2 Ma, with an isochronal age of 141.1±1.4 Ma, which is consistent with sensitive, high-resolution ion microprobe (SHRIMP) zircon U—Pb ages of quartz monzodiorite and granodiorite in the mining area. Dating analysis yields ages from 136.0±2.0 Ma to 143.0±2.4 Ma for the quartz monzodiorite (a weighted average of 139.4±1.2 Ma) and ages from 136.7±2.0 Ma to 145.3±2.4 Ma for granodiorite (a weighted average of 141.0±1.1 Ma).

Published
2012

17. Re-Os Dating of Molybdenite from the Nannihu Mo (-W) Orefield in the East Qinling and Its Geodynamic Significance

Author

Guo Baojian, Mao Jingwen, LI Yongfeng, HU Huabin, Shao Yongjun, and Fei Hongcai

Subjects
Isochron, Mineralization (geology), geography, geography.geographical_feature_category, Geochemistry, Geology, Crust, Mantle (geology), Tectonics, Craton, Paleontology, Molybdenite, Mesozoic
Abstract

Located in the East Qinling molybdenum metallogenic belt on the southern margin of the North China craton, the Nannihu Mo (-W) orefield comprising Nannihu, Sandaozhuang, and Shangfanggou deposits is a superlarge skarn-porphyry Mo (-W) orefield in the world. Re-Os dating was performed of six molybdenite samples from the Mo deposits in the Nannihu Mo orefield with inductively coupled plasma mass spectrometry (ICP-MS). The results show that the Re-Os model ages are 145.8±2.1-141.8±2.1 Ma for the Nannihu deposit, 145.4±2.0-144.5±2.2 Ma (averaging 145.0±2.2 Ma) for the Sandaozhuang deposit and 145.8±2.1-143.8±2.1 Ma (averaging 144.8±2.1 Ma) for the Shangfanggou deposit; dating of the six samples yields an isochron age of 141.5±7.8 Ma (2σ), which accurately determines the timing of mineralization. The results also suggest that the ore-forming materials were mainly derived from the lower crust, mixed with minor mantle components. These Mo deposits were formed during the transition of the Mesozoic tectonic regime in eastern China, and its mineralization was a part of the Late Mesozoic large-scale mineralization in that region.

Published
2010

30. Distribution and Collection of China's Dinosaurs

Author

Hao Qingqing, Fei Hongcai, Hao Ziguo, Liu Lian, and Turner Susan

Subjects
business.industry, Distribution (economics), Geology, Physical geography, China, business
Published
2015

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