晚新生代以来天山北缘沉积记录及其稳定同位素变化的环境意义

CORC > 北京大学 > 地球与空间科学学院

	晚新生代以来天山北缘沉积记录及其稳定同位素变化的环境意义; Sedimentary records and paleoenvironmental significance of stable isotopic evidences from the late Cenozoic, northern Tianshan
	邓松涛 ; 顾潇 ; WU ChaoDong ; GUO ZhaoJie
刊名	岩石学报
	2008
关键词	晚新生代以来天山北缘沉积记录稳定同位素变化古气候变化 late cenozoic northern Tianshan sedimentary records stable isotopic changes paleoenvironmental changes
英文摘要	晚新生代以来,天山北缘的沉积记录与天山的隆升密切相关.研究表明:始-渐新世安集海河组主要沉积发育水平层理的绿色、灰绿色湖泊相泥岩;晚渐新世沙湾组中上部岩石组合特征为紫红色曲流河相砂岩、粉砂岩和砾岩夹层;早中新世塔西河组下部主要为灰绿色、褐红色砂、泥岩互层,上部主要为土黄色砂岩和粉砂岩夹层;晚中新世-早上新世独山子组为辫状河相灰色砾岩和砂砾岩沉积;晚上新世-早更新世西域组主要为厚层砾岩堆积.土壤碳酸盐中稳定同位素数据表明:安集海河组δ13C平均值为-3.9‰,δ18O平均值为-5.0‰;沙湾组中上部δ13C平均值为-8.1‰,δ18O平均值为-11.0‰;塔西河组δ13C平均值为-5.9‰;δ18O平均值为-7.7‰;独山子组δ13C平均值为-8.5‰,δ18O平均值为-10.3‰;西域组δ13C平均值为-6.0‰,δ18O平均值为-10.4‰.同位素结果和沉积记录共同表明,始-渐新世为湿润温暖气候;晚渐新世为干旱寒冷气候;早中新世早期为半湿润、半温暖气候,晚期为干旱、寒冷气候;晚中新世.早上新世为干旱寒冷气候;晚上新世-下更新世为干旱、半温暖气候.结合古地磁数据和全球气候变化,天山北缘晚新生代以来发生五次主要气候变化事件,即晚渐新世(沙湾组时期中上部)气候转换,约24Ma(沙湾组时期顶部)气候突变,早中新世内部(约24～19Ma)气候转换事件,晚中新世(约7Ma)C4植被迅速扩张和约3.17Ma以来气候的剧烈震荡.; Sedimentary records in northern Tianshan are in response to the uplift of the Tianshan Mountain from the late Cenozoic. Eocene-Oligocene Anjihaihe formation mainly deposite gray or dark gray lacustrine mudstone with flat bedding; Late Oligocene Shawan formation are overlain purple meander sandstone, siltstone and interbedded conglomerate are dominant; the lower of Early Miocene Taxihe formation consist of gray or brownish siltstone and mudstone frequently coexist; the upper are brownish or gray-yellowish sandstone with interbedded siltstone; Late Miocene-Early Pliocene Dushanzi formation are composed of braided-fluvial accumulation of dark gray conglomerate or associated with brownish or gray-yellowish sandstone; Late Pliocene-Early Pleistocene Xiyu formation consist of a large amount of alluvial fan pebble to boulder conglomerate. Stable carbon and oxygen isotopic data show: average VC values from Eocene-Oligocene, through Late Oligocene, lower of Early Miocene, upper of Early Miocene, Late Miocene-Early Pliocene to Late Pliocene-Early Pleistocene are similar to-3. 9 parts per thousand, similar to-8. 1 parts per thousand,similar to- 5. 9 parts per thousand, similar to- 8. 5 parts per thousand, similar to- 6. 0 parts per thousand respectively, while average delta O-18 values are similar to - 5. 0 parts per thousand, similar to - 11.0 parts per thousand, similar to- 7. 7 parts per thousand, similar to- 10. 3 parts per thousand, similar to - 10. 4 parts per thousand respectively. Stable isotopic changes and sedimentary records indicate paleoenvironmental changes: warm-wet during Eocene-Oligocene, and and cold during Late Oligocene, semi-humid and semi-warm during lower of Early Miocene, and and cold during upper of Early Miocene, and and cold during Late Miocene-Early Pliocene, arid and semi-warm during Late Pliocene to Pleistocene. Combined with paleomagnetic data in this area, stable isotopic results, sedimentary records and global climate change, five paleoenvironmental changes have developed in northern Tianshan since the late Cenozoic: climate conversion during late of Qligocene, climate break at Early Miocene( similar to 24Ma), climate conversion during early of Miocene(24 similar to 19Ma), C-4 rapidly expand at Late Miocene( similar to 7Ma) and climate intensely vibrate at Late Pliocene to Early Pleistocene ( similar to 3. 17Ma).; 国家重点基础研究规划项目课题; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000256696700008&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 1; 4; 689-698; 24
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/249105]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	邓松涛,顾潇,WU ChaoDong,等. 晚新生代以来天山北缘沉积记录及其稳定同位素变化的环境意义, Sedimentary records and paleoenvironmental significance of stable isotopic evidences from the late Cenozoic, northern Tianshan[J]. 岩石学报,2008.
APA	邓松涛,顾潇,WU ChaoDong,&GUO ZhaoJie.(2008).晚新生代以来天山北缘沉积记录及其稳定同位素变化的环境意义.岩石学报.
MLA	邓松涛,et al."晚新生代以来天山北缘沉积记录及其稳定同位素变化的环境意义".岩石学报 (2008).