阿尔金断裂带东端40Ar/39Ar和裂变径迹定年及其地质意义

CORC > 北京大学 > 地球与空间科学学院

	阿尔金断裂带东端40Ar/39Ar和裂变径迹定年及其地质意义; 40Ar/39Ar and fission-track analysis of eastern segment of Altyn Tagh fault and its geological significance
	张志诚 ; 龚建业 ; 王晓丰 ; 郭召杰 ; 张臣
刊名	岩石学报
	2008
关键词	40Ar/39Ar年龄裂变径迹分析热历史剥露阿尔金断裂 (40)Ar/(39)Ar dating fission-track dating thermal history exhumation the Altyn Tagh fault
英文摘要	通过对酒西盆地北缘阿尔金构造岩中3件钾长石加40Ar/39Ar同位素和沿赤金堡到下天津卫石油河剖面花岗岩磷灰石、锆石裂变径迹定年研究,获得了断裂带内构造岩220～207Ma的钾长石40Ar/39Ar激光探针概率年龄,其中锆石裂变径迹定年也获得了233±19Ma以及192±26Ma的近似同时的年龄,代表了晚三叠世到早侏罗世快速的冷却事件,其可能与羌塘和昆仑地块的碰撞有关.锆石裂变径迹定年记录的149～135Ma年龄,也可能反映了晚侏罗世到早白垩世的冷却事件的存在,这一冷却剥露伴随而来的早白垩世的广泛沉积作用.磷灰石裂变径迹中值年龄主要介于42～28Ma,这一年龄结果和热史模拟表明晚始新世到渐新世,40～30Ma的冷却事件.研究区经历了类似于青藏高原北缘地区的冷却降温历史,其隆升和剥露演化受控于欧亚板块南部昆仑、羌塘、拉萨地体的碰撞拼合和印度碰撞后持续挤压作用.; K-feldspar (40)Ar/(39)Ar laser dating analysis is carried on 3 samples collected from the cataclasite in the Altyn Tagh fault at northern part of Jiuxi Basin. Fission track dating has been carried out along the river from Chijinbao to Xiatianjinwei. Eight samples were analyzed using the apatite fission track method and four samples were analyzed on zircon. Argon and Argon Ages on K-fetdspar, ranging from 220Ma to 207Ma, and zircon fission track ages, ranging from 233 +/- 19 to 192 +/- 26Ma are indicative of a general late Triassic-early Jurassic cooling probably driven by the collision between the Qiantang and Kunlun blocks. Ages on zircons, ranging from 149 +/- 10 to 135 +/- 13Ma may be show a late Jurassic-early Cretaceous cooling event. This Jurassic-Cretaceous denudation was followed by a period of sedimentation during the early Cretaceous. The AFT central ages are between 72 +/- 4Ma to 28 +/- 2Ma, and most of them at range of 42 +/- 3Ma and 28 +/- 2Ma. These AFT ages and thermal history modeling show evidence of a late Elocene-Oligocene times cooling episode between 40 and 30 Ma. Mesozoic and Cenozoic cooling in the study area is broadly coincident with uplift and exhumation recorded elsewhere in the northern Qinghai-Tibet Plateau region. The rapid uplifting and denudation are probably due to the accretion of Kunlun, Qiangtang and Lhasa block and the collision of India with Asia.; 国家重点基础研究发展计划(973计划); 国家自然科学基金; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000259628700010&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); 5; 5; 1041-1053; 24
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/249019]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	张志诚,龚建业,王晓丰,等. 阿尔金断裂带东端40Ar/39Ar和裂变径迹定年及其地质意义, 40Ar/39Ar and fission-track analysis of eastern segment of Altyn Tagh fault and its geological significance[J]. 岩石学报,2008.
APA	张志诚,龚建业,王晓丰,郭召杰,&张臣.(2008).阿尔金断裂带东端40Ar/39Ar和裂变径迹定年及其地质意义.岩石学报.
MLA	张志诚,et al."阿尔金断裂带东端40Ar/39Ar和裂变径迹定年及其地质意义".岩石学报 (2008).