Palynomorph assemblages and paleoclimate records from the Zhuanchengzi Bed of the Yixian Formation, western Liaoning Province, China
Palynomorph assemblages and paleoclimate records from the Zhuanchengzi Bed of the Yixian Formation, western Liaoning Province, China
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DOI：
10.1007/s11430-015-5147-x
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发表时间：
2015-07
期刊：
影响因子：
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通讯作者：
Ying Cui;Enpu Gong;Tiehui Wang;Changqing Guan;Yonglin Zhang;Junhong Liang
中科院分区：
文献类型：
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作者：
Ying Cui;Enpu Gong;Tiehui Wang;Changqing Guan;Yonglin Zhang;Junhong Liang
对辽西鹰窝山地区义县组转城子层的孢子和花粉样品进行了采集、处理、鉴定和分析。结果，我们确认了疤痕孢子-原针叶属的孢粉形态组合。花粉主要来自裸子植物，尤其以针叶树花粉为主。蕨类植物孢子不太常见，偶尔也会出现一些可疑的被子植物花粉。孢粉形态组合的时代可追溯到瓦兰吉阶晚期或欧特里维安-巴列姆阶，即早白垩世。该研究首次应用基于孢粉学光谱和孢粉类群古生态特征的孢粉植被概念。对辽西义县组砖城子层进行了孢粉植被类型、气候带类型和湿度类型的定量划分。然后我们获得了进化趋势。结果表明，义县组转城子层沉积期气候总体温暖湿润。孢粉植被类型多种多样，包括针叶林、落叶阔叶林、常绿阔叶林、草丛和灌木。当地气温由温暖转为偏暖，由半湿润气候转为湿润气候。孢粉植被类型始终以针叶林为主。落叶阔叶林、常绿阔叶林、灌木、草本植物和部分旱生植物的共存表明了辽西义县组的垂直分带和季节气候变化。垂直植被类型和温暖湿润的气候可能意味着辽西义县组地貌反差较大。
We collected, processed, identified, and analyzed the spores and pollen samples from the Zhuanchengzi Bed of the Yixian Formation in the Yingwoshan area of western Liaoning. As a result, we confirm a palynomorph assemblage ofCicatricosisporites-Protoconiferus. The pollen was primarily from gymnosperms, dominated especially by conifer pollen. Pteridophyte spores were less common and some questionable angiosperm pollen occurred occasionally. The age of the palynomorph assemblage is dated as the late Valanginian or Hauterivian-Barremian stage, the Early Cretaceous. The study applies the concept of Palynological Vegetation based on palynological spectra and the paleoecological characteristics of palynological taxa for the first time. Palynological vegetation type, climatic zone type, and humidity type are divided quantitatively for the Zhuanchengzi Bed in the Yixian Formation of western Liaoning. We then obtained the evolutionary trends. The results showed that the overall climate was warm and humid during the deposition period of the Zhuanchengzi Bed in the Yixian Formation. Palynological vegetation types are various and include coniferous forest, deciduous broadleaf forest, evergreen broad-leaved forest, grass, and shrubs. The local temperature changed from warm to much warmer and from a semi-humid to humid climate. Palynological vegetation types are always dominated by coniferous forest. The coexistence of deciduous broad-leaved forest, evergreen broad-leaved forest, shrubs, grass, and some xerophytic plants indicates vertical zonation and seasonal climate change The vertical vegetation types and the warm humid climate may imply a large geomorphological contrast in the Yixian Formation of western Liaoning.