柴达木盆地宗马海湖地区中新统上油砂山组轮藻植物群  

MIOCENE CHAROPHYTE FLORA FROM THE SHANGYOUSHASHAN FORMATION IN ZONGMAHAIHU AREA, QAIDAM BASIN, NORTHWEST CHINA

作　　者：李莎[1] 王贺[1] 崔庆岗 张树淇 王启飞[3] 张海春[1] LI Sha;WANG He;CUI Qing-gang;ZHANG Shu-qi;WANG Qi-fei;ZHANG Hai-chun(State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment,Chinese Academy of Sciences,Nanjing,210008;Shandong Geological Prospecting Institute of China Chemical and Geological Mine Bureau^Tai'an,271000;Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment Chinese Academy of Sciences、Nanjing,210008)

机构地区：[1]中国科学院南京地质古生物研究所和生物演化与环境卓越创新中心,现代古生物学和地层学国家重点实验室,江苏南京210008 [2]中化地质矿山总局山东地质勘查院,泰安地质分院,山东泰安271000 [3]中国科学院南京地质古生物研究所和生物演化与环境卓越创新中心,江苏南京210008

出　　处：《地层学杂志》2019年第4期343-351,共9页Journal of Stratigraphy

基　　金：国家自然科学基金(41602003,41688103);中国科学院战略性先导科技专项(B类XDB26000000);中国地质调查局“青海省冷湖行委宗马海湖地区J46E010015、J46E010016、J46E011016、J46E011017四幅1∶5万区域地质调查”(12120113033030)共同资助

摘　　要：我国西北地区的柴达木盆地沉积了巨厚而连续的新生代陆相地层,其北缘宗马海湖地区中新统上油砂山组非常发育,在一道梁剖面出露良好。本文首次报道并详细描述了该剖面上油砂山组的岩性特征,主要为褐红色、灰绿色和灰色砂岩、粉砂岩夹泥岩,发育滨、浅湖沉积相。共发现轮藻化石2属2种:Nitellopsis(Tectochara)merianii和Lychnothamnus barbatus var.antiquus.这两个种广泛分布于欧亚大陆,前者的延限从晚始新世至更新世;后者在我国可能为首次报道,之前仅见于欧洲和土耳其某些地区的中新统地层。根据轮藻化石的时代延限,上油砂山组的沉积时代为中新世,与已有古地磁研究结果一致。对上述两种轮藻化石的现生相关类群的生活环境分析表明,N.(T.)merianii和L.barbatus var.antiquus可能生活于大型冷水、淡水湖泊,这与沉积相分析结果一致。Cenozoic non-marine strata are very thick and continuous in the Qaidam Basin,Northwest China.The Miocene Shangyoushashan Formation is well developed in the Zongmahaihu area in the northern Qaidam Basin,especially in the Yidaoliang section.The formation in this section is reported and lithologically described herein in detail for the first time.It is mainly composed of red,gray・greenish and grayish sandstones and siltstones interbedded with mudstones,mainly relating to shore and shallow lake facies.Two species belonging to two genera of charophytes were described,including Nitellopsis(Tectochard)merianii and Lychnothamnus barbatus var.antiquus.These two species were ever widely distributed in Eurasia,with N.(T.)merianii ranging in age from the latest Eocene to Pleistocene,and L.barbatus var.antiquus probably reported in China for the first time,previously known from the Miocene in Europe and Turkey.According to the age of these two species,the Shangyoushashan Formation is Miocene in age,which is consistent with previous magnetostratigraphical results.Analysis of their extant representatives about living environments indicates that the above two charophytes should have lived in large,cold and freshwater lakes,in agreement with the results of lithofacies analysis of sediments.

关 键 词：中新世 上油砂山组 藏卵器 古环境 柴达木盆地 

分 类 号：P534.62[天文地球—古生物学与地层学]