The discovery of Paleogene insect fossils in eastern Nima Basin, Tibet, and its implication for paleoclimate
-
摘要:
藏北尼玛盆地自白垩纪以来沉积了巨厚的陆相碎屑岩夹灰岩地层，由于缺乏生物化石证据，其地层时代一直存在较大的争议。最近，在尼玛盆地东部赛布错一带的细碎屑岩夹灰岩地层中发现大量的昆虫、鱼类和植物化石。昆虫化石主要为伦坡拉大黾蝽Aquarius lunpolaensis，与伦坡拉盆地达玉地区和尼玛盆地西部江弄淌噶地区报道的种属形态特征基本一致，显示该套地层为晚渐新世丁青湖组沉积，而不是竟柱山组或牛堡组。另外，伦坡拉大黾蝽主要生活在温暖湿润的低海拔地区，结合近年在青藏高原中部伦坡拉盆地和尼玛盆地晚渐新世地层中发现的热带-亚热带鱼类和大植物化石组合，指示青藏高原腹地在晚渐新世为温暖湿润的低地环境，而不是过去认为的高寒气候。
Abstract:Since the Cretaceous period, thick terrigenous clastic rocks interbedded with limestone strata have been deposited in the Nima Basin, northern Tibet, but the deposition age is still debatable due to the lack of fossil evidence.Recently, a lot of insect, fish and plant fossils were discovered from the fine clastic rocks interbedded with limestone strata in the Saibu Co area in the east of the Nima Basin.The insect fossils mainly consist of Aquarius lunpolaensis, which is consistent with the morphological characteristics of the species reported in the Dayu area in the Lunpola Basin and the Jiangnongtangga area in the west of Nima Basin, indicating that this set of strata was Late Oligocene Dingqinghu Formation rather than the Jingzhushan Formation or Niubao Formation.In addition, Aquarius lunpolaensis mainly existed in warm and humid environment at low elevation area and, in combination with tropical to subtropical fish and plant fossil assemblage in the Late Oligocene strata in the Lunpola and Nima basins of central Tibet found in recent years, the authors argue for a warm and humid lowlands environment in the Late Oligocene period in the central Tibet rather than high and cold climate as used to be considered.
-
Keywords:
- insect fossil /
- Late Oligocene /
- Dingqinghu Formation /
- Nima Basin
-
致谢: 本文昆虫化石由中国科学院南京地质古生物研究所蔡晨阳博士鉴定，野外地质调查过程中得到成都理工大学陈云博士和核工业280研究所胥明工程师、杨开涛驾驶员的大力帮助，审稿专家对本文提出了宝贵的修改意见，在此一并表示衷心感谢。
-
![]()
图 1 尼玛盆地构造位置图(A)及研究区地质简图(B)
Figure 1. The tectonic location of the Nima basin(A) and schematic geological map of the study area(B)
-
杜佰伟, 谭富文, 陈明.西藏伦坡拉盆地沉积特征分析及油气地质分析[J].沉积与特提斯地质, 2004, 24(4):46-54. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=yxgdl200404007 潘磊, 王均杰, 李旭文, 等.西藏伦坡拉盆地中央凹陷带走滑断层特征及其对油气成藏的影响[J].沉积与特提斯地质, 2019, 39(2):27-34. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=yxgdl201902003 王波明, 周家声, 闻涛, 等.西藏尼玛盆地陆相地层归属及其油气意义[J].天然气技术, 2009, 3(4):21-25. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=QK200902736903 李亚林, 王成善, 朱利东, 等.西藏尼玛盆地油页岩的发现及其地质意义[J].地质通报, 2010, 29(12):1872-1874. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=zgqydz201012016 林启彬.藏北第三纪的几种昆虫化石[C]//中国科学院青藏高原综合科学考察队.西藏古生物(第三分册).北京: 科学出版社, 1981: 345-348. 李英烈, 伍新和, 汪锐.西藏尼玛盆地发现多种化石:地层划分新证据[J].中国地质, 2018, 45(6):1310-1311. http://www.cnki.com.cn/Article/CJFDTotal-DIZI201806023.htm Cai C Y, Huang D Y, Wu F X, et al.Tertiary water striders (Hemiptera, Gerromorpha, Gerridae) from the central Tibetan Plateau and their palaeobiogeographic implications[J].Journal of Asian Earth Science, 2019, 175:121-127. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=64aa30fb14222aedcc7650d5fc83f0ee
Wu F L, Miao Y F, Meng Q Q, et al.Late Oligocene Tibetan Plateau Warming and Humidity:Evidence From a Sporopollen Record[J].Geochemistry, Geophysics, Geosystems, 2018, 20:434- 441. https://www.researchgate.net/publication/329788933_Late_Oligocene_Tibetan_Plateau_Warming_and_Humidity_Evidence_From_a_Sporopollen_Record
Kapp P, DeCelles P G, Gehrels G E, et al.Geologic records of the Lhasa- Qiangtang and Indo-Asian collisions in the Nima area of central Tibet[J]. Geological Society of America Bulletin, 2007, 119(7/8) :917-933. https://www.researchgate.net/publication/249527369_Geological_records_of_the_Lhasa-Qiangtang_and_Indo-Asian_collisions_in_the_Nima_area_of_central_Tibet
邓涛, 王世骐, 颉光普, 等.藏北伦坡拉盆地丁青组哺乳动物化石对时代和古高度的指示[J].科学通报, 2011, 56(34) :2873-2880. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=kxtb201134006 Sun J M, Xu Q H, Liu W M, et al.Palynological evidence for the latest Oligocene-early Miocene paleoelevation estimate in the Lunpola Basin, central Tibet[J].Palaeogeography, Palaeoclimatology, Palaeoecology, 2014, 399:21-30. http://www.irgrid.ac.cn/handle/1471x/951594
Mao Z Q, Meng Q Q, Fang X M, et al.Recognition of tuffs in the middle-upper Dingqinghu Fm., Lunpola Basin, central Tibetan Plateau:Constraints on stratigraphic age and implications for paleoclimate [J].Palaeogeography, Palaeoclimatology, Palaeoecology, 2019, 525:44-56.
曾胜强, 王剑, 陈文彬, 等.伦坡拉盆地西部丁青湖组新发现凝灰岩锆石U-Pb年龄及其地质意义[J].地质学报, 2020, DOI: 10.19762/j.cnki.dizhixuebao.2020017. Wu F X, Miao D S, Chang M M, et al.Fossil climbing perch and associated plant megafossils indicate a warm and wet central Tibet during the Late Oligocene[J].Scientific Reports, 2017, 7:878. https://www.nature.com/articles/s41598-017-00928-9
邓涛, 吴飞翔, 苏涛, 等.青藏高原-现代生物多样性形成的演化枢纽[J].中国科学:地球科学, 2019, doi: 10.1360/SSTe-2019-0112. 邓涛, 吴飞翔, 王世骐, 等.古近纪/新近纪之交青藏高原陆地生态系统的重大转折[J].科学通报, 2019, 64:2894-2906. http://kns.cnki.net/KCMS/detail/detail.aspx?dbcode=CJFD&filename=KXTB201927015 Wang N, Wu F.New Oligocene cyprinid in the central Tibetan Plateau documents the re-uplift tropical lowlands[J].Ichthyological Research, 2015, 62:274-285. doi: 10.1007/s10228-014-0438-3
谢尚克, 王剑, 付修根, 等.西藏伦坡拉盆地丁青湖组油页岩特征及勘探有利区评价[J].沉积与特提斯地质, 2018, 38(2):55-63. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=yxgdl201802007 河南省地质调查院.中华人民共和国区域地质调查报告《尼玛区幅》.2002. 伊海生, 夏国清, 李高杰, 等.尼玛盆地赛布错坳陷沉积构造调查科研报告.2019.
下载:
计量
- 文章访问数: 2848
- HTML全文浏览量: 356
- PDF下载量: 1638
