in Jurassic and Cretaceous Stratigraphy

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Earth Science Frontiers, Vol. 17, Special Issue, Aug. 2010 ISSN 1005-2321 Science Press, Beijing, 1963:1-429 (in Chinese). Woodward F.I. Stomatal numbers are sensitive to increases in CO2 from pre-industrial levels. Nature, 1987, 327(6123): 617-618. Wu X.W., Li B.X. A study of some bryophytes from Middle Jurassic Qiaoerjian Formation in Yunxian District of Hebei, China. Acta Paleontologica 354 Sinica, 1992, 31(3): 257-279 (in Chinese with English abstract). Zhang S. An introduction to coal-forming plants in Xiahuayuan Formation, Yuxian Coalfield, Hebei Province. Coal Geology of China, 2009, 23(3): 12-14, 28 (in Chinese with English abstract).
Earth Science Frontiers, Vol. 17, Special Issue, Aug. 2010 ISSN 1005-2321 The Evolution of the Jurassic Climate in China Shenghui Deng, Yuanzheng Lu, Ru Fan, Wenzhe Duan State Key Laboratory of Enhanced Oil Recovery (Research Institute of Petroleum Exploration and Development, PetroChina), Beijing, 100083, China (E-mail: shdeng2001@yahoo.com.cn) The major data used in palaeoclimatic analysis include: ⅰ, Sedimentology: the climatic sensitive minerals and sedimentary rocks; ⅱ, Palaeontology: the abundance, diversity and distribution of climate sensitive organism remains, including plants (spore and pollen also) (Deng, 2007), bivalves, ostracods, as well as their morphology and structure; ⅲ, Geochemistry: the contents or ratios of the relevant trace elements, carbon and oxygen isotope values and their variations in rocks or fossils; ⅳ, ancient atmospheric concentrations of carbon dioxide based on organic carbon isotopic values and stomata parameters of plant epidermis. As indicated by the four types data mentioned above, the evolution of the Jurassic climate in China can be roughly divided into 5 stages, namely the early-middle Early Jurassic, late Early Jurassic, early Middle Jurassic, late Middle Jurassic and Late Jurassic. 1.Early-middle Early Jurassic (about Hettangian- Pliensbachian) There are 5 climatic regions in China during the Jurassic (Fig.1 A): ⅰ, The Wusuli cool temperate region, a small area of Eastern Heilongjiang Province located at high latitude in the Jurassic. The climate type is indicated by cool water faunas (Zhong et al., 2003). ⅱ, The North China warm temperate region with warm-humid climate. It is bounded by the Kunlun- Qinling-Dabie Mountains at the south, including Northwest, North and Northeast China except the east part of Heilongjiang Province. ⅲ, South China subtropic-tropic region, characterized by hot and humid climate, including Southeast and Middle-South China. Its west boundary is near the line of Chengdu- Yongchuan-Zunyi-Guilin-Wuzhou-Zhanjiang. ⅳ, Southwest subtropic-tropic arid or semi-arid climatic region, joined with the South subtropic-tropic hothumid region on the east, and bounded by the Lomuco-Shuanghu-Lancang River suture zone (north Tibet and west Yunnan Provinces) on the west, including west and south of Sichuan Province, middle-east of Yunnan Province, west parts of Guizhou Province and Guangxi Province. The north and east of Tibet and south of Xinjiang and Qinghai Province are also included in this region temporarily due to lack of effective data. ⅴ, Tibet-west Yunnan tropic arid region, including the major of the Tibet and western Yunnan Province(Fig.1 B). 2. Late Early Jurassic (mainly the Toracian) There are five climatic regions in China as the former stage. But due to the obvious temperature rise, the south boundary of the warm temperate region moves distinctly northward to the Altai-Longshou- Yinsha-Yansha Mountains, and its area is markedly reduced, which meets the global Toarcian temperature rising and arid event (Vakhrameev, 1991). 3.Early Middle Jurassic (Aalian-Bajocian) The temperature obviously decreases in this stage and the south boundary of the North temperate region moves southward to the position almost equivalent to the early Early Jurassic stage (Fig.1 C). 4. Late Middle Jurassic (Bathonian-Callovian) The temperature rises in this stage, which results the south boundary of the north warm temperate region moving northward greatly to close to the Yanshan Mountain of North China (Fig.1 D). The major of north, northwest China belong to subtropic semiarid and semihumid climate, and the south and southwest of China are attributed to tropic-subtropic arid climatic region. 5. Late Jurassic The temperature rises greatly during the Late Jurassic. It is generally arid in China, from which the temperate humid climatic region disappears. The subtropic humid climatic region is just confined in the northeast of China, and almost all the other areas of China belong to hot and arid climate region, and deserts are even existed in North China (Zhang et al., 2008). Key words: Jurassic; Climate; Evolution; China 355
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