| 张新萌,蔡恝浩,谢成,李垌林,赵佳乐,闫德飞*.柴达木盆地花土沟地区渐新世史氏达尔文介(Darwinula stevensoni)研究[J].甘肃地质,2025,34(4):1-7 |
| 柴达木盆地花土沟地区渐新世史氏达尔文介(Darwinula stevensoni)研究 |
| OLIGOCENE Darwinula stevensoni IN HUATUGOU AREA OF THE QAIDAM BASIN, CHINA |
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| DOI： |
| 中文关键词: 介形虫 古环境 渐新世 上干柴沟组 柴达木盆地 |
| 英文关键词:Ostracoda paleoenvironment Oligocene Shangganchaigou Formation Qaidam Basin |
| 基金项目:国家自然科学基金项目(42172005) |
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| 中文摘要: |
| 本文研究了采自柴达木盆地花土沟地区渐新统上干柴沟组剖面中的介形虫化石，经鉴定为史氏达尔文介（Darwinula stevensoni）。化石主要特征为壳体侧视整体呈近长卵形，前端窄圆，最大曲率位置低于体中线，向下倾斜；后端钝圆，最大曲率位置稍高于体中线，上部较突。背缘呈微拱形，向前倾斜，中部较平直；腹缘近直微凸，后部向上斜伸。壳体表面光滑，中后部最高也最厚。通过Darwinula stevensoni壳体特征、生态习性研究表明，渐新世时研究区为温暖湿润气候，水体盐度为淡水-微咸水，可能为浅水环境滞水沉积。这一结论与其他植物化石、鱼类化石、沉积岩石学等研究可以较好地相互印证。本文Darwinula stevensoni研究可为柴达木古气候古环境重建提供微体古生物方面的证据。 |
| 英文摘要: |
| Abstract: This paper studies ostracoda fossil collected from the profile of the Shangganchaigou Foration(Oligocene) in the Huatugou area. Qaidam Basin. The fossil was identilfied as Darwinula stevensoni (Brady andRobertson, 1870). The characteristics of Darwinula stevensoni are as follows: The shell is almost elongated ovalin lateral view; the shell's anterior end is narrowly rounded, and the position of maximum curvature below themedian Iine of the body and sloping downward; the shell's posterior end is obtsely rounded, and the position ofmaximum curvature slighlly above the median Iine of the body, and the upper part is relaively prominent. Thedorsal margin of the shell is slighily arched, slopes forward, and is relatively suraight in the middle. The ventralmargin is nearly straight with a slight convexiy, and its posterior part slopes upward. The surface of the shell issmooth, and the highest and thickest part located in the middle -posterior region. Studies on the shellcharacteristics and ecological habils of Darwinula stevensoni indicate that during the Oligocene, the study areahad a warm and humid climate, with water salinitly ranging from frteshwater to brackish water, and theenvironment was likely a stagnant water setting.This condlusion is well corroborated by studies on other plantfossils, fish fossils, and sedimentary petrology. The study on Darwinula stevensoni in this paper can providemicrofossil evidence for the reconstruction of the paleoclimate and paleoenvironment of the Qaidam Basin. |
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