| 中国三叠纪陆相地层及植物群 |
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| 引用本文：周统顺,周惠琴.1983.中国三叠纪陆相地层及植物群[J].地球学报,5(1):95-110. |
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| 中文摘要:<正> 我国三叠纪陆相地层分布广泛、发育完好、化石丰富并赋存煤和石油等矿产,是世界上研究陆相三叠系的重要地区之一。尤其北方那些二叠、三叠系连续沉积的盆地(如准噶尔盆地、陕甘宁盆地等)更是解决陆相二叠、三叠系界线和建立陆相三叠系地层层序的关键地区。 我国陆相三叠系的研究工作,早在本世纪初期业已开始,但大量系统的研究工作乃是解放后展开的。1959年的全国地层会议对中国中生代陆相地层进行了首次系统总结(斯行健、周志炎,1962)。通过近二十年的工作,在地层古生物方面又积累了丰富的新材料,取得了许多重要进展和突破,从而填补了我国三叠系陆相地层的一些空白,使某些长期争议的难题得以初步解决,所有这些都为进一步认识我国三叠纪陆相地层的全貌、确立其标准层序、进而建立我国三叠纪的植物群序列，打下了有力的基础。 |
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| TRIASSIC NON-MARINE STRATA AND FLORA OF CHINA |
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| Abstract:Triassic non-marine strata in China is widely distributed. well developed, rich in fossil. and associated with coal and petroleum deposits; sothey serve as one of the important objects for studying continental Triassic in the world. And China forms also the critical region for definingthe boundary of continental Triassic and establishing typical sequencesof continental Triassic. In China. during the Triassic, the line of Palaeo-Kunlun-PalaeoQinling-Palaeo-Dabieshan marking out what is commonly expressed as"Marine South and Continental North" exerts important controlling effects on the types of sedimentation, subdivision of palaeoclimatic andpalaeobotanic geographical provinces. In the vast continental areas northof this line, there were evolved reddish detrital sediments under continental arid climates, and coal-bearing and oil rock-bearing series of semiarid to damp enviroments, which is called the North (Continental) type;while in early and middle Triassic south of this line. there occurredmarine faceis but in the upper Triassic littoral marsh facies developedwith widespread coal-bearing strata, which is known as the South (marine to alternately marine and continental) type. The continental Triassic best developed in the Shaanxi-Gansu-Ningxia basin in North China might be taken as the representative ofNorth (Continental) type, with the following typical sequence, in ascending order: lower series (Liujiagou and Heshanggou Formations); middleseries (Ermayin and Tongchuan Formations) and the upper series (Yanchang Formation). They are transitional between each other. The alternately continental and marine-continental Triassic in SouthChina consists of ; lower series (Lingwen group of Hainan Island), middleseries (Badong Formation and Huangmaqing Group of middle-lower Yangtze), and upper series (Daqiaodi and Xujiahe Formations of Western-South region, Anyuan Formation of South China). In Triassic the Palaeo-Kulun-Palaeo-Qinling-Palaeo-Dabieshan inChina divides the country into two flora geographic regions: i.e., theNorth (inland) region, and the South (littoral) region. Sequence of Triassic floras and flora assemblages in the North region is as follows: Ⅰ. Pleuromeia-Voltzia flora; Late Early Triassic to Early MiddleTriassic. 1. Pleuromeia-Neuropteridium assemblage: represented by fossil floraof the Heshanggou Formation, of Late Early Triassic. 2. Voltzia-Aipteris wuziwanensis assemblage: represented by fossilflora of the Ermayin Formation, of Early Middle Triassic. Ⅱ. Danaeopsis-Bernoullia flora: Late Middle Triassic to Late Triassic. 1. Annalepis-Tongchuanophyllum assemblage: represented by fossilflora of the Tongchuan and Dingjiayao Formations, of Late Middle Triassic. 2. Thinnfeldia-Danaeopsis fecunda assemblage: represented by floraof the Yanchang Formation equivalent strata, of Early to Late epochs ofLate Triassic. Sequence of Triassic flora and their assemblages in theSouth region, sum up in the following: Ⅰ.Neuropteridium-Voltzia assemblage: flora assemblage of LingwenGroup, of Late Early Triassic. Ⅱ.Annalepis-Neocalamites merianii assemblage: flora assemblage ofBadong Formation and Huangmaqing Group, of Middle Triassic. Ⅲ.1.Rireticopteris-Pterophyllum longifolium flora; flora assemblageof the Daqiaodi Formation, of Early to Middle epochs of Late Triassic. 2. Ptilozamites-Lepidopteris flora: represented by fossil flora ofthe Anyuan, Genkou Group, Wenbinshan, Xujiahe Formations and Yipinglang Group, of middle to late epochs or early to late epochs of LateTriassic. |
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