| 新疆乌恰早白垩世孢粉植物群及其环境意义 |
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| 引用本文： | 江德昕,王永栋,魏江.新疆乌恰早白垩世孢粉植物群及其环境意义[J].古地理学报,2007,9(2):185-196. |
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| 作者姓名： | 江德昕 王永栋 魏江 |
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| 作者单位： | 1.中国科学院地质与地球物理研究所 北京100029;2.中国科学院南京地质古生物研究所 江苏南京210008;3.美国弗吉尼亚州立诺福克大学 诺福克VA 23504 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)
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国家自然科学基金 |
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| 摘 要： | 基于新疆乌恰地区下白垩统克孜勒苏群51属77种孢子花粉化石的研究，建立了研究区早白垩世早期和晚期两个孢粉植物群。早期孢粉植物群以裸子植物松柏纲松杉目为主，包括掌鳞杉科、松科、罗汉松科、南美杉科和杉科；晚期孢粉植物群的主要成员与早期孢粉植物群基本一致，不同的是掌鳞杉科植物含量大幅度下降。根据孢粉植物群的特征，探讨了该区早白垩世古生态、古气候、沉积环境及古地理意义。研究结果表明乌恰地区早白垩世气候属于亚热带干燥或半干燥型，早期气候温暖干燥，晚期气候暖热半干燥。孢粉学资料显示乌恰地区早白垩世孢粉植物群成员多样，既有来自山地的松杉目植物，又有生长于沼泽湿地的苔藓植物，反映了当时古地理景观复杂多样、植物群落地理分布有明显的垂直分带现象。
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| 关 键 词： | 新疆 乌恰 塔里木盆地 早白垩世 孢粉植物群 古气候 古地理 |
| 文章编号： | 1671-1505（2007）02-0185-12 |
| 收稿时间： | 2006-05-12 |
| 修稿时间： | 2006-11-03 |
Palynofloras and their environmental significance of the Early Cretaceous in Wuqia, Xinjiang Autonomous Region |
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| Jiang Dexin,Wang Yongdong,Wei Jiang.Palynofloras and their environmental significance of the Early Cretaceous in Wuqia, Xinjiang Autonomous Region[J].Journal of Palaeogeography,2007,9(2):185-196. |
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| Authors: | Jiang Dexin Wang Yongdong Wei Jiang |
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| Institution: | 1.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing100029;2.Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences, Nanjing210008,Jiangsu;3.Norfolk State University, Norfolk VA23504, USA |
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| Abstract: | Based on the investigations of 77 species of fossil spores and pollen belonging to 51 genera found in the Lower Cretaceous Kizilsu Group in the Wuqia region of Xinjiang Autonomous Region, the early and late Early Cretaceous palynofloras in the region have been established. The early Early Cretaceous palynoflora is dominated by gymnospermous Coniferales, including the Cheirolepidiaceae, Pinaceae, Podocarpaceae, Araucariaceae and Taxodiaceae. The late Early Cretaceous palynoflora is basically similar to that of the early Early Cretaceous, but content of Cheirolepidiaceae decreases sharply. According to the characters of the palynofloras, the Early Cretaceous palaeoecologic, palaeoclimatic,sedimentary environment as well as palaeogeographic significance have been discussed. The results indicate that the Early Cretaceous palaeoclimate in the Wuqia region should belong to the arid or semi-arid type of subtropic zone, temperate-warm and arid in the early Early Cretaceous and warm-hot and semi-arid in the late Early Cretaceous. The palynological data show that the Early Cretaceous floras are of various origins, including the Coniferales plants from mountain terrene and the moss plants from marsh wetland. The palaeogeography of the Early Cretaceous is characterized by complex and various outlook and the obvious vertical zoning of the plant geographic distribution. |
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| Keywords: | Xinjiang Autonomous Region Wuqia Tarim Basin Early Cretaceous palynoflora palaeoclimate palaeogeography |
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