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甘肃马鬃山地区早白垩世Carpolithus化石的研究
投稿时间:2020-07-26  修订日期:2020-09-13  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2021029
摘要点击次数: 89
全文下载次数: 119
作者单位地址
李爱静 兰州大学地质科学与矿产资源学院 甘肃省兰州市城关区天水南路222号
惠建国 兰州大学地质科学与矿产资源学院 
马国荣 兰州大学地质科学与矿产资源学院 
王森 兰州大学地质科学与矿产资源学院 
张静 兰州大学地质科学与矿产资源学院 
雷向通 兰州大学地质科学与矿产资源学院 
杜宝霞 兰州大学地质科学与矿产资源学院 甘肃省兰州市城关区天水南路222号
基金项目:国家自然科学基金项目(编号 41872010、41602023和41402007);第二次青藏高原科学考察 2019QZKK0704;中央高校基础研究经费(Lzujbky-2019-45)资助的成果。
中文摘要:甘肃马鬃山地区早白垩世地层发育,富含植物化石,但研究程度相对较低。本文综合多种方法对甘肃马鬃山地区下白垩统赤金堡组所产出的裸子植物种子化石进行了详细的形态学及解剖学研究。利用体式显微镜及X射线断层扫描成像技术对其形态特征进行了详细的观察研究;利用光学显微镜,荧光显微镜和扫描电子显微镜对其表皮微细构造进行了细致观察对比。认为,当前化石与Carpolithus形态特征吻合,Carpolithus主要特征为形状椭圆形、卵圆形或纺锤形,表面光滑或有纹饰。并将发现的多枚裸子植物种子化石分别鉴定为Carpolithus mazongshanensis sp. nov.(马鬃山石籽)和Carpolithus cf. jidongensis(鸡东石籽相似种)。其中C. mazongshanensis sp. nov.种子卵圆形,顶端具尖喙,基部浑圆,表面具弧状平行的纵纹,种皮外角质层细胞呈长条形;珠心角质层细胞近正方形或多边形,均未见气孔器。C. cf. jidongensis种子长卵形,顶端钝尖,基部渐狭,两侧具弧形纵纹,种皮外角质层细胞呈长条形,无气孔器。通过与现生裸子植物种子形态及表皮特征的对比分析,本次发现的石籽属化石归属于柏科,推测可能与侧柏属亲缘关系较近。
中文关键词:Carpolithus  马鬃山  早白垩世  形态特征  微细构造
 
Study of Carpolithus from the Lower Cretaceous of Mazongshan, Gansu Province
Author NameAffiliationAddress
liaijing School of Earth Sciences, Lanzhou University 甘肃省兰州市城关区天水南路222号
huijianguo School of Earth Sciences, Lanzhou University 
maguorong School of Earth Sciences, Lanzhou University 
wangsen School of Earth Sciences, Lanzhou University 
zhangjing School of Earth Sciences, Lanzhou University 
leixiangtong School of Earth Sciences, Lanzhou UniversityYunnan Key Laboratory for Palaeobiology, Institute of Palaeontology, Yunnan University, 
dubaoxia School of Earth Sciences, Lanzhou University 甘肃省兰州市城关区天水南路222号
Abstract:The Lower Cretaceous deposits in Mazongshan area of Gansu Province are rich in plant fossils, which are poorly studied. In this paper, detailed morphological and anatomical studies were conducted on the gymnosperm seed fossils collected from the Lower Cretaceous Chijinbao Formation in the Mazongshan area, Gansu Province. The morphological structures are observed by using Stereo-microscope and X-ray tomography, and the cuticular micro-structures are observed by using Light Microscope, Fluorescence Microscope and Scanning Electron Microscope. According to the morphological and epidermal characteristics, the present gymnosperm seed fossils were identified as Carpolithus. Carpolithus is elliptical, oval or spindle-shaped with smooth or ornamental surface. And the present numberous gymnosperm seed fossils were identified as Carpolithus mazongshanensis sp. nov. and Carpolithus cf. jidongensis respectively. C. mazongshanensis sp. nov. is oval shaped, beaked apically and rounded basally, with arc-shaped parallel longitudinal grains on the seed surface, the outer stratum corneum cells of C. mazongshanensis sp. nov. seed coat were elongated; the stratum corneum cells were nearly square or polygon, all without stomata. C. cf. jidongensis is oblong ovate shaped, obtuse apically and narrow gradually at the base, with arc-shaped longitudinal grains on the seed sides, the outer stratum corneum cells of C. cf. jidongensis seed coat are elongated and without stomata. Based on the contrastive analysis of both morphology and epidermal characters with extant gymnosperm seeds, C. mazongshanensis sp. nov. and C. cf. jidongensis may be closely related to Platycladus.
keywords:Carpolithus, Mazongshan, Early Cretaceous, Morphology, Cuticular structures
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