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Early Cretaceous palynofloral provinces in China: western additions
Authors:Jianguo Li  David J Batten
Institution:1. Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China (email: jgli@nigpas.ac.cn);2. School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK;3. Institute of Geography and Earth Sciences, Aberystwyth University, Wales SY23 3DB, UK
Abstract:Two distinct palynofloral provinces have been recognized for the Early Cretaceous of western China, including Xizang (Tibet): one indicated by the presence of the cheirolepidiacean pollen grain Dicheiropollis and the other by abundant representatives of different gymnospermous pollen, especially Araucariacites and Callialasporites. The boundary between them coincides with the Yarlung Zangbo Suture. To the north of the suture, the Xizang–Tarim Dicheiropollis Province occupies a wide region from southern Xinjiang through the central and northern Qinghai–Xizang Plateau to the west of Yunnan. South of the suture, the Southern Xizang Araucariacites‐Callialasporites Province appears to have affinities with the South Gondwanan (floral) Realm. Despite some similarities with the composition of assemblages from other palynofloral provinces, both are distinct and considered to reflect different climates. Hot arid to semi‐arid conditions are indicated by the Dicheiropollis Province, whereas a more humid and somewhat cooler climate is suggested for the Araucariacites‐Callialasporites Province.
Keywords:Early Cretaceous  Gondwana  paleoclimate  palynofloral province  palynofloral realm  Tethys  western China
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