摘要
本文研究了新疆鄯善照壁山沟口克拉玛依组顶部的孢粉化石 ,共鉴定孢粉 46属 70种 ,命名为 Punctatisporites- Aratrisporites- Taeniaesporites- Parataeniaesporites组合。根据组合主要分子的时限及其含量变化 ,以及与有关已知时代孢粉组合进行对比 ,鉴定其地质时代为中三叠世。
The present paper deals with the Middle Triassic sporopollen assemblage of the top part of the Karamay Formation from Zhaobishan Goukou section in Shanshan, Xinjiang, NW China. This assemblage contains 46 genera and 70 species of spores and pollen. According to the abundance of the important genera, the present sporopollen flora was named the Punctatisporites Aratrisporites Taeniaesporites Parataeniaesporites Assemblage. Characteristics of this sporopollen assemblage are as follows: 1. Gymnospermous pollen grains dominates (averaging 64.3%) the assemblage. The conifer bisaccate pollen grains occur in great abundance (32.58%), mainly including Vitreisporites pallidus, Alisporites australis, A. parvus, A. minutisaccus, A. rotundus, Parvisaccites nolus, Piceites enodis, Pseudopicea variabiliformis, Protopicea vilujensis, Abietineaepollenites pectinellus, Pinuspollenites divulgatus, Platysaccus papilionis, Podocarpidites multesimus, P. fusiformis, P. minisculus , etc. Next in abundance is the striate, ridged and laesurate bisaccate pollen (22.29%), such as Vittatina sp., Taeniaesporites albertae, T. pellucidus, T. novimundi, T. nubilus, T. hexagonalis, T. kraeuseli, Parataeniaesporites pseudoreticulatus, Protohaploxypinus sp., Striatoabieites sp., Striatopodocarpites sp., Gardenasporites sp., Jugasporites sp., Angustisulcites klausii, Chordasporites australiensis . Monosaccate pollen occupies third position (7.54%), including Cordaitina gunnyalensis, C. sp.. The remaining pollen types are Ginkgocycadophytus nitidus, Chasmatosporites apertus, C. minor , etc. 2. Pteridophyte spores are less than gymonospemous pollen grains in average percentage (34.57%). The circular laevigate spores rank first (12.03%), such as Calamospora mesozoicus, Retusotriletes mesozoicus, R. simplex, Punctatisporites triassicus, P. leighensis , among them Punctatisporites takes the first place with a percentage of 5.64%. Granulate and spinate spores rank second in content (8.26%), such as Granulatisporites parvus, Angiopteridaspora denticulata, Acanthotriletes conicus, Apiculatisporis globosus, A. parvispinosus, A. spiniger, Raistrickia sp.. The zonate spores rank third in content ( 6.02% ), such as Kraeuselisporites sp., Annulispora sp., Limatulasporites limatulus, Discisporites psilatus, Densoisporites sp. Aratrisporites occupies fourth position (3.01%), including Aratrisporites granulatus, A. tenuispinosus . The remaining spores are Leiotriletes sp., Toroisporis sp., Verrucosisporites contactus, Coverrucosisporites sp., Foveosporites sp., Rugulatisporites sp., etc. 3. The rarely present bryophyte spores (1.13%) are Stereisporites antiquasporites, S. apolaris.
出处
《微体古生物学报》
CSCD
北大核心
2000年第3期291-298,共8页
Acta Micropalaeontologica Sinica
关键词
孢粉组合
克拉玛依组
中三叠世
新疆
古气候
sporopollen assemblage, Karamay Formation, Middle Triassic, Zhaobishan, Shanshan, Xinjiang
