收藏本站
《中国科学院地质与地球物理研究所2007学术论文汇编(第二卷)》 2008年
收藏 | 手机打开
二维码
手机客户端打开本文

Palaeogeothermal response and record of Late Mesozoic lithospheric thinning in the eastern North China Craton

【摘要】:正The palaeotemperature recorded by vitrinite reflectance(R_o) in the pre-Cenozoic uplifted stratigraphic strata,and in Palaeozoic-Mesozoic remnant basins outside the Cenozoic depocentres,has not been overprinted by later thermal events in the eastern North China Craton(NCC).Based on downhole R_o data from the Palaeozoic and the Mesozoic subsections, we reconstruct the temperature gradients when the subsections reached their maximum palaeotemperatures in the Middle Triassic and the Cretaceous,and calculate the corresponding heat flow histories since the early Mesozoic.The temperature gradient and heat flow were much higher in the Cretaceous(35-43℃km~(-1) and 73-83 mW m~(-2),respectively) than in the Middle Triassic and at the present.The high palaeo-heat flow during the Late Mesozoic implies that the thickness of the"thermal"lithosphere at that time was c.65 km,about half the thickness of c.135 km estimated for the Early Mesozoic.The change from a stable thermal regime to an active thermal regime took place during the Late Jurassic-Early Cretaceous(c.110 Ma).This tectonothermal event was accompanied by extensive surface erosion,and is also evidenced in the areas adjacent to the NCC,such as the South Yellow Sea and East China Sea basins.Our study provides not only geothermal evidence for the Late Mesozoic lithospheric thinning,but also additional constraints on the thinning mechanism,which is currently being debated.

知网文化
【相似文献】
中国重要会议论文全文数据库 前10条
1 ;Palaeogeothermal response and record of Late Mesozoic lithospheric thinning in the eastern North China Craton[A];中国科学院地质与地球物理研究所2007学术论文汇编(第二卷)[C];2008年
2 Martyn J.Unsworth;Max A.Meju;;Crustal deformation of the eastern Tibetan plateau revealed by magnetotelluric imaging[A];中国科学院地质与地球物理研究所第十届(2010年度)学术年会论文集(中)[C];2011年
3 ;Neoproterozoic zircon inheritance in eastern North China craton(China) Mesozoic igneous rocks:derivation from the Yangtze craton and tectonic implications[A];中国科学院地质与地球物理研究所第11届(2011年度)学术年会论文集(上)[C];2012年
4 ;A thinned lithospheric image of the Tanlu Fault Zone,eastern China:Constructed from wave equation based receiver function migration[A];中国科学院地质与地球物理研究所2006年论文摘要集[C];2007年
5 Patrick Monié;Michel Faure;Urs Schrer;Nicole Le Breton;;Cooling paths of the NE China crust during the Mesozoic extensional tectonics:Example from the south-Liaodong peninsula metamorphic core complex[A];中国科学院地质与地球物理研究所第11届(2011年度)学术年会论文集(上)[C];2012年
6 José Badal;;Crustal structure and extensional deformation of thinned lithosphere in Northern China[A];中国科学院地质与地球物理研究所第11届(2011年度)学术年会论文集(上)[C];2012年
7 ;Late Mesozoic extensional tectonics of the Liaodong Peninsula massif:Response of crust to continental lithosphere destruction of the North China Craton[A];中国科学院地质与地球物理研究所第11届(2011年度)学术年会论文集(上)[C];2012年
8 ;Crust-mantle interaction in the central North China Craton during the Mesozoic:Evidence from zircon U-Pb chronology,Hf isotope and geochemistry of syenitic-monzonitic intrusions from Shanxi province[A];中国科学院地质与地球物理研究所第11届(2011年度)学术年会论文集(上)[C];2012年
9 Maxwell A.Meju;;Deep structure of the Longling-Ruili fault underneath Ruili basin near the eastern Himalayan syntaxis:insights from magnetotelluric imaging[A];中国科学院地质与地球物理研究所二○○三学术论文汇编·第二卷(青藏高原)[C];2003年
10 Noriko Kita;Gen Shimoda;Yuichi Morishita;;Secular evolution of the lithospheric mantle beneath the eastern North China craton:evidence from peridotitic xenoliths from Late Cretaceous mafic rocks in the Jiaodong region,east-central China[A];中国科学院地质与地球物理研究所第11届(2011年度)学术年会论文集(上)[C];2012年
中国知网广告投放
 快捷付款方式  订购知网充值卡  订购热线  帮助中心
  • 400-819-9993
  • 010-62982499
  • 010-62783978