天山北缘侏罗系地层热历史演化及其地质意义:磷灰石裂变径迹和镜质体反射率证据

doi:10.3969/j.issn.1000-0569.2007.07.014

CORC > 北京大学 > 地球与空间科学学院

	天山北缘侏罗系地层热历史演化及其地质意义:磷灰石裂变径迹和镜质体反射率证据; Thermal history of the Jurassic Strata in the Northern Tianshan and its geological significance, revealed by apatite fission-track and vitrinite-reflectance analysis
	张志诚 ; 郭召杰 ; 吴朝东 ; 方世虎
刊名	岩石学报
	2007
关键词	准噶尔盆地磷灰石裂变径迹镜质体反射率冷却剥露 Junggar basin apatite fission track dating vitrinite reflectance cooling exhumation
DOI	10.3969/j.issn.1000-0569.2007.07.014
英文摘要	对天山北缘石场-玛纳斯、安集海河和四棵树河地区18个样品进行了磷灰石裂变径迹年龄测定,同时测定了中生界地层10件裂变径迹样品相应煤层的镜质体反射率。结果表明地层由老到新镜质体反射率逐渐增加,磷灰石裂变径迹中值年龄逐渐降低。石场-玛纳斯地区,下部三叠系煤层镜质体反射率 R_o 值较低,为O.56%,磷灰石裂变径迹中值年龄较大,为125.3±9.1Ma;八道湾组煤层 R_o 为0.53%～0.64%,磷灰石裂变径迹中值年龄介于81.3±4.7～87.8±5.9Ma;上部西山窑组煤层 R_o 最高,达到0.81%,磷灰石裂变径迹中年龄较低,为44.0±5.4～11.8±1.8Ma;相同层位,东部石场...; Apatite fission track (AFT) dating is carried on 18 samples collected from Shichang-Manas, Anjihai river and Sikesu area of the Northern margin of Tianshan. Vitrinite reflectance (R-o) data of 10 samples from the Triassic to Jurassic coal seam were obtained to provide maximum paleotemperatures for the stratigraphic strata experiencing. The AFT and Ro data shown that the value of Ro gradually is increased and the AFT central age decreased, along with the strata growing younger. In the section of Shichang-Manas, the Ro of Triassic is about 0.56%,and the AFT central ages is 125.3 +/- 9.1 Ma at the bottom of section; the Ro of Lower Jurassic is about 0.53% similar to 0.64%, and the AFT central ages are between 81.3 +/- 4.7 and 87.8 +/- 5.9Ma at the middle of the section; Ro of Middle Jurassic is about 0.81%,and the AFT central age is at range of 44.0 +/- 5.4 and 11.8 +/- 1.8Ma at the topside of section. The Ro of Shichang-Manas, which is located in the eastern part of the study erea, is bigger than that of Sikeshu, which is laocted in the western of the area, at the same strata. The AFT central age is reversed. Modeled best-fit paleothermal histories for the Mesozoic samples, showing a Jurassic period of burial and heating. The burial depth of Triassic and the lower Jurassic strata is shallower than that of the middle Jurassic. The data suggest that maximum burial and thermal maturity of the Triassic and lower Jurassic rocks occurred at Late Jurassic to Early Cretaceous, and then retained at the same depth till Miocene. This history is consistent with the AFT modeling result of the underlying granite. The cooling of Late Jurassic to Early Cretaceous can be typically interpreted as the result of decreasing of paleothermal gradient at the Cretaceous. The burial and heating of the Middle Jurassic rocks preserved for a long time until late Oligocene. All AFT samples show evidence for Miocene rapid cooling, beginning at about 10 Ma. This cooling is typically interpreted as the result of uplift and erosion of overlying strata. The Mesozoic strata exposed on the southwestern Junggar basin margin underwent 4 5 km of late Miocene to present, and the exhumation rate is about 400 similar to 500m/Ma. This process was corresponding with the re uplift of Tianshan and propagation of thrusting northeast of the Tianshan boundary thrust. Miocene cooling of Mesozoic and Paleozoic granite suggests that uplift of the northern Tianshan occurred significantly later than previously proposed and is consistent with timing of intense deformation in the southwestern Junggar basin.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000249590500014&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); 16; 07; 1683-1695; 23
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/49186]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	张志诚,郭召杰,吴朝东,等. 天山北缘侏罗系地层热历史演化及其地质意义:磷灰石裂变径迹和镜质体反射率证据, Thermal history of the Jurassic Strata in the Northern Tianshan and its geological significance, revealed by apatite fission-track and vitrinite-reflectance analysis[J]. 岩石学报,2007.
APA	张志诚,郭召杰,吴朝东,&方世虎.(2007).天山北缘侏罗系地层热历史演化及其地质意义:磷灰石裂变径迹和镜质体反射率证据.岩石学报.
MLA	张志诚,et al."天山北缘侏罗系地层热历史演化及其地质意义:磷灰石裂变径迹和镜质体反射率证据".岩石学报 (2007).