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A new approach to the paleoecological relationship between rudists and benthic foraminifers in Maastrichtian of Tethys basin in the Central Zagros, Iran
Carbonates and Evaporites ( IF 1.4 ) Pub Date : 2022-05-09 , DOI: 10.1007/s13146-022-00774-5
Borzu Asgari-Pirbalouti , Mohammadsadegh Dehghanian

The paleoecological relationship between rudist and foraminifera fossil faunas in tarbur Formation of Tethys basin deposits in Zagros mountain range has been studied by field measurements and microscopic thin-section laboratory. The presence of foraminifera is very weak in reef layers of these deposits that considering the rich rudist fossil fauna. Foraminifera are found with high frequency in the fore reef, back reef, and lagoon facies. However, in reef formations, foraminifera are very weak and rarely present. Of course, sometimes, they may be transported to the reef by sea waves and currents, and because the structure of the reef is very porous, so they are trapped inside the cavities and remain there. Rudists have been identified in Tarbur Formation that proves the Maastrichtian age. Oligotrophic foraminifers’ genera are abundant in the Maastrichtian that disappears with changing environmental conditions to Eutrophic or Mesotrophic. These environmental conditions were very favorable for rudists and agglutinin foraminifera. The results demonstrate that foraminifera are very rare in abundant rudist fossils parts. It can be deduced the foraminifer larvae feeds to rudists due to the suspension-feeding and reducing the number of them near the rudistic reefs. The eutrophic rudists living environment has been accounted for high volumes of food by suspension-feeding of them, thereby reducing food and foraminifera population has been declining. Rudists have been disposed of a high volume of fecal to the environment. The composition of seawater has been changing and live in such places has been difficult to foraminifera caused by exit this waste.



中文翻译:

伊朗中部扎格罗斯特提斯盆地马斯特里赫特陆栖动物与底栖有孔虫古生态关系的新方法

通过野外实测和显微薄片实验室研究了扎格罗斯山脉特提斯盆地沉积物tarbur组地壳虫和有孔虫化石群的古生态关系。考虑到丰富的陆基化石动物群,在这些沉积物的礁层中,有孔虫的存在非常弱。有孔虫在前礁、后礁和泻湖相中的发现频率很高。然而,在珊瑚礁地层中,有孔虫非常弱且很少存在。当然,有时它们可​​能会被海浪和洋流运送到礁石,由于礁石的结构非常多孔,所以它们被困在洞穴内并留在那里。在证明马斯特里赫特时代的 Tarbur 组中发现了 Rudists。贫养有孔虫的属在马斯特里赫特丰富,随着环境条件向富营养或中营养的变化而消失。这些环境条件对地壳虫和有孔虫凝集素非常有利。结果表明,有孔虫在丰富的地壳化石部分中非常罕见。可以推断,有孔虫幼虫由于悬浮摄食,减少了靠近陆栖礁的数量,从而以陆栖动物为食。富营养化的蛞蝓生活环境已经占到大量的食物,通过对它们的暂停喂食,从而减少了食物和有孔虫的数量。Rudists 已将大量粪便排放到环境中。

更新日期:2022-05-10
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