Biradiolites from the Yigeziya Formation of the Southwestern Tarim Basin
Biradiolites from the Yigeziya Formation of the Southwestern Tarim Basin
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塔里木盆地西南部伊格子牙组双放射岩
DOI：
10.4236/ojg.2019.910042
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发表时间：
2019-09
期刊：
影响因子：
--
通讯作者：
Rao Xin
中科院分区：
文献类型：
--
作者：
Rao Xin
本文对塔里木盆地西南部依革子崖组的两种比拉闪长岩进行了订正。马斯特里赫特的Biradiolites boldjuanensis是一种小型管状物种，通常以簇或花束的形式保存。虽然它被认为是中亚特有的，但在马斯特里赫特和其他特提斯地区也有大量类似的标本。较小的biradiolite标本与biradiolite属没有关系，因为它们的前、后带为突出的脊状，带间为凹陷的宽沟状。本种与坎帕尼亚-马斯垂克特东部阿拉伯种Glabrobournonia arabica在右瓣的外壳层光滑，每个壳侧面边缘有简单的径向带和脊的特征相似，但在左瓣的大小和形状上与后者不同。该研究将为建立和重建中亚与其他特提斯地区之间的古地理联系提供支持工具。
Two Biradiolites species described from the Yigeziya Formation of the southwestern Tarim Basin are revised. The Maastrichtian Biradiolites boldjuanensis is small and pipe-like species that is usually preserved as clusters or bouquets. Although it was considered to be endemic to Central Asia, similar specimens are abundant in Maastrichtian of other Tethyan regions. Biradiolites minor specimens have no relationship with the genus Biradiolites because their ventral and posterior bands are protruding ridges and interband is depressed broad groove. This species is comparable with the Campanian-Maastrichtian eastern Arabian species Glabrobournonia arabica, by the character of smooth outer shell layer in right valve, and simple radial bands and ridges on margin of each shell flank, but it differs from the latter species in size and the shape of left valve. This study will be a supportive tool for the establishment and reconstruction of the palaeogeographic connection between Central Asia and other Tethyan regions.