Study on the Formative Mechanism of the Mixed CathaysianAngaran Floras  in Gansu of Northwest China

Abstract

Abstract:

This paper sums up systematically present situation and recent progress of the mixed Late Permian Cathaysian-Angaran floras in Gansu of Northwest China. The paper discusses the formative mechanism of the mixed Cathaysian- Angaran floras. During the Early Permian, the Tarim Plate, together with the North China Plate, moved northwestwards, meanwhile, the Kazakhstania and Siberia plates drifted southeastwards. During the Middle Permian, the Cathaysian continent collided with the Siberian continent along the line from the Tian-shan Mountains, Yinshan Mountains and Da Hinggan Mountains to cause the closure of an ancient ocean and the uplifting of mountain systems so that the plate collision provided ‘a mixing’ condition between the Cathaysia flora and the Angara flora. A few mixed elements of the two floras occured in the region during the late Middle Permian. The Cathaysian and Angaran continents began to merge with each other due to the collision and connection of the Tarim and North China plates with the Kazakhstan and Siberian plates, which formed the mixed Cathaysian- Angaran floras during the Late Permian. In addition, the distribution patterns of the mixed floras may be due to plate movement, climatic differentiation, environmental change, plant migration and plant evolution in terrestrial ecosystems.

Key words: China, Gansu, Permian, Cathaysian flora, Angaran flora, formative mechanism

CLC Number:

Q914

SUN Ke-Qi, LIU Jun. Study on the Formative Mechanism of the Mixed CathaysianAngaran Floras in Gansu of Northwest China[J]. Geoscience, 2010, 24(5): 880-887.

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所有植物化石标本均采自甘肃玉门大山口剖面晚二叠世肃南组下部。化石标本保存在中国科学院古脊椎动物与古人类研究所。
1Tatarina sp. 1，登记号：IVPP B1388。2Callipteris altaica Zalessky，登记号：IVPP B1390。3Annularia orientalis Kawaski，登记号：IVPP B1391。4Tatarina sp. 2，登记号：IVPP B1389。5Lobatannularia ensifolia (Halle) Halle，登记号：IVPP B1392。6Fascipteris sp. (sp. nov.)，登记号：IVPP B1379。7Zamiopteris glossopteroides Schmalhausen，登记号：IVPP B1393。8Annularia gracilescens Halle，登记号：IVPP B1394。9，10Lobatannularia lingulata (Halle) Halle，登记号：IVPP B1395，IVPP B1396。

Study on the Formative Mechanism of the Mixed CathaysianAngaran Floras in Gansu of Northwest China

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