阿根廷非海相白垩纪孢粉生物地层学概述  

NON-MARINE CRETACEOUS PALYNOMORPH BIOSTRATIGRAPHY OF ARGENTINA:A BRIEF SUMMARY

作　　者：Mercedes B. PRAMPARO 

机构地区：[1]阿根廷国家研究部科技中心风雪、冰川和环境科学研究所古生物学研究室阿根廷门多萨POBox330

出　　处：《地层学杂志》2012年第2期213-228,共16页Journal of Stratigraphy

基　　金：国家自然科学基金(No.91114201);国家重点基础研究发展计划(2012CB821906)资助出版

摘　　要：通过总结已发表的含有孢粉的地质体的资料,评价了阿根廷白垩纪的孢粉地层序列。在阿根廷由北向南的7个白垩纪盆地中确立了正式与非正式的生物带框架。这些盆地从北至南分别是:萨尔塔群盆地,圣路易斯盆地,内乌肯盆地,南方盆地,德赛多地块盆地,圣豪尔赫湾盆地,泛安第巴塔戈尼亚盆地。阿根廷早白垩世的孢粉组合相对被人熟知,但描述和讨论晚白垩世的微古植物群的文献则很少。在凡兰吟期至阿普特期的所有孢粉植物群中,松柏类裸子植物的花粉组合Cyclusphaera-Balmeiopsis-Classopollis占主导。Celyphus rallus(丝状蓝菌)与Cyclusphaera一起出现,但是在巴列姆期时,它们在整个巴塔戈尼亚盆地全部消失。早期被子植物的花粉化石是阿普特期和更年轻地层的重要标志,它们已被用于定义孢粉化石带。在阿根廷与山龙眼科的首现相当的Peninsul apollisgillii是出现于所有晚坎潘期至马斯特里赫特期的孢粉组合中的少数物种之一,有时也与Grapnelispora loncochensis一起出现。这些物种的出现可能是一个孢粉化石带的标志。本文提供了孢粉化石带和白垩纪主要地层单位的初步对比表。An evaluation of the Cretaceous palynostratigraphy of Argentina has been undertaken, by reviewing published data of the geological units with palynomorphs. Formal and informal biozonation schemes were compiled from seven Cretaceous Argentinean basins presented from north to south： the Salta Group Basin, San Luis Basin, Neuquen Basin, Austral Basin, Deseado Massif, San Jorge Gulf Basin, and extra-andean Patagonia. The Early Cretaceous paly- nological associations are relatively well-known in Argentina; however there is sparse published literature describing and discussing Late Cretaceous miofloras. The association of gymnosperm pollen grains, with conifer affinity Cy- clusphaera-Balmeiopsis-Classopollis dominates in all the palynofloras from the Valanginian to the Aptian. Celyphus rallus （filamentous cyanobacteria） appears together with Cyclusphaera but disappears in the Barremian in all the Pata- gonian basins. Pollen grains belonging to basal angiosperms are important stratigraphic markers in Aptian sediments and younger, and have been used to define palynozones. Peninsulapollis gillii which corresponds to the first record of the Proteaceae family in Argentina is one of the few species, which occurs in all the late Campanian-Maastrichtian associa- tions, sometimes together with Grapnelispora loncochensis. Their presence could be indicative of a provisional paly- nozone. A preliminary correlation chart of the palynozones is presented together with a chart of the main Cretaceous stratigraphic units.

关 键 词：生物地层学 孢粉学 非海相 白垩纪 阿根廷 

分 类 号：P534.53[天文地球—古生物学与地层学]