摘要
滇西高原的隆升引起莺歌海盆地的沉积速率、沉积通量的陡增、层序界面间的不整合 ,高原内部盆地沉积速率增加、充填序列改变、间歇性隆升剥蚀。根据这些响应标志重塑了滇西高原的隆升历史 :(1 ) 2 3～ 1 9Ma的初始隆升 ;(2 ) 1 6 .2～ 1 1Ma的快速隆升 ;(3) 1 1～ 5 .3Ma的剥蚀夷平 ;(4) 5 .3～ 1 .6Ma的急剧隆升 ,滇西高原基本定型 ;(5)1 .6～ 0Ma的剥蚀
The Western Yunnan Plateau (WYP) is located at the southeastern Qinghai Tibet plateau.The Yinggehai at the southeast termination of the Red River Fault Zone is a new (mainly Neogene) strike slip basin which is one of the peripheral basins of the WYP.The WYP uplift results in not only sharply increasing of sedimentation rate and sedimentation flux in the Yinggehai basin,discordance of sequence interface,violently increasing of clastic supplying volume from the WYP,but also increasing of sedimentation rate in the interior plateau basins,changing of filling sequence and uplift denudation peridically.The history of tectonic subsidence is very similiar in both Yinggehai basin and interior plateau basins and,they kept basically the same pace in tectonic subsidence.The marks such as the accumulation peak period in Yinggehai basin and interior plateau basins,the denudation period of interior plateau basins,the peak period of clastic supplying from WYP denuded,respond to a rapid upliftiong of WYP.The lower accumulation rate and the reduction steeply of clastic supplying from WYP denuded respond to relative stable period of WYP.Based on these marks respond to uplift,we reconstruct uplifting history of WYP,including initial uplifting (23～19 Ma),rapid uplifting (16.2～11 Ma),denudation planation(11～5.3 Ma),accelerated denudation and uplift(1.6～0 Ma).The WYP was formed basically in 5.3～1.6 Ma,the average relative to uplifting rate was 0.5～0.57mm/a and maximmum in 2.5 Ma.The altitude above sea level of WYP was uplifted regionally about 610～700 m in past 1.6 Ma.
出处
《沉积学报》
CAS
CSCD
北大核心
2000年第2期234-240,共7页
Acta Sedimentologica Sinica
基金
国家重点基础研究计划 !( 19980 4 0 80 0 )
]国土资源部"GIS支持下的青藏高原隆升与沉积响应研究"资助
关键词
滇西高原
莺哥海盆地
隆升
沉积响应
盆地沉积
the Western Yunnan Plateau the Yinggehai basin uplifting sedimentary response
