JINZHANGIA, A NEW STAFFELLID FUSULINOIDEA FROM THE MIDDLE PERMIAN DAAOZI FORMATION OF THE BAOSHAN BLOCK, WEST YUNNAN, CHINA
JINZHANGIA, A NEW STAFFELLID FUSULINOIDEA FROM THE MIDDLE PERMIAN DAAOZI FORMATION OF THE BAOSHAN BLOCK, WEST YUNNAN, CHINA
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DOI：
10.2113/31.3.233
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发表时间：
2001-07
影响因子：
1.1
通讯作者：
K. Ueno
中科院分区：
文献类型：
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作者：
K. Ueno
首次报道并图解了滇西保山地块大凹子组下部二叠纪有孔虫化石。保山地块是冈瓦纳大陆的一个陆块，它被认为是了解冈瓦纳大陆在古生代和中生代的分散和亚洲的增生的关键。到目前为止，其晚古生代有孔虫的记录很少。大凹子组合以代表新属Jinzhangia的椭圆形Staffellids为主，J.shengi Ueno，n. sp.为模式种，以及其他一些较小的有孔虫，包括Pachyphloia robustaformis Wang，Okimuraites？参见O. guvenci（Altiner）和Kamurana？虽然这些有孔虫不提供一个精确的年龄测定，相关的珊瑚揭示了Murgabian年龄的组合。在欧亚大陆的卵形和纺锤形Staffellids中，只有外高加索中二叠世的Leella armenica Rozovskaya应归属于新属Jinzhangia。因此，金章亚显然是局限于保山和外高加索，这是一个部分的Cimmerian大陆和古地理独立的冈瓦纳大陆和华夏地块，如印支和扬子，在二叠纪和三叠纪的时间。
Permian foraminifers are reported and illustrated for the first time from the lower part of the Daaozi Formation of the Baoshan Block, West Yunnan, China. The Baoshan Block is a Gondwana-derived continental fragment that is believed to be a key to understanding Gondwana dispersion and Asian accretion during Paleozoic and Mesozoic time. Its Late Paleozoic foraminifers have been poorly documented until now. The Daaozi assemblage is dominated by oval staffellids representing the new genus, Jinzhangia, with J. shengi Ueno, n. sp. as the type species, and several other smaller foraminifers, including Pachyphloia robustaformis Wang, Okimuraites ? cf. O. guvenci (Altiner), and Kamurana ? sp. Although these foraminifers do not provide a precise age determination, associated corals reveal a Murgabian age for the assemblage. Among the oval and fusiform staffellids from Eurasia, only Leella armenica Rozovskaya from the Middle Permian of Transcaucasia should be referable to the new genus Jinzhangia. Thus, Jinzhangia apparently is restricted to Baoshan and Transcaucasia, which are parts of the Cimmerian continent and which was paleogeo-graphically independent of both Gondwanaland and the Cathaysian blocks, such as Indochina and Yangtze, during Permian and Triassic time.