U-PbSHRIMP zircon geochronology and T-t-d history of the Kampa Dome, Southern Tibet

doi:10.1016/j.tecto.2007.11.004

	U-PbSHRIMP zircon geochronology and T-t-d history of the Kampa Dome, Southern Tibet
	Quigley, M. C.1; Liangjun, Y.2; Gregory, C.3; Corvino, A.; Sandiford, M.1; Wilson, C. J. L.1; Xiaohan, L.2
刊名	TECTONOPHYSICS
	2008
卷号	446 期号:1-4 页码:97-113
关键词	Gneiss domes channel flow structural geology U-PbSHRIMP geochronology himalaya Tibet
ISSN号	0040-1951
DOI	10.1016/j.tecto.2007.11.004
文献子类	Article
英文摘要	Structural, petrographic and geochronologic studies of the Kampa Dome provide insights into the tectonothermal evolution of orogenic crust exposed in the North Himalayan gneiss domes of southern Tibet. U-Pb ion microprobe dating of zircons from granite gneiss exposed at the deepest levels within the dome yields concordia Pb-206/U-238 age populations of 506 +/- 3 Ma and 527 +/- 6 Ma, with no evidence of new zircon growth during Himalayan orogenesis. However, the granite contains penetrative deformation fabrics that are also preserved in the overlying Paleozoic strata, implying that the Kampa granite is a Cambrian pluton that was strongly deformed and metamorphosed during Himalayan orogenesis. Zircons from deformed leucogranite sills that cross-cut Palcozoic metasedimentary rocks yield concordant, Cambrian ages from oscillatory zoned cores and discordant ages ranging from ca. 491-32 Ma in metamict grains. Since these leucogranites clearly post-date the metasedimentary rocks, they intrude, the zircons are interpreted as xenocrysts that are probably derived from the Kampa granite. The Kampa Dome formed via a series of progressive orogenic events including regional similar to N-S contraction and related crustal thickening (D-1), predominately top-to-N ductile shearing and crustal extension (D-2), top-to-N brittle-ductile faulting and related folding on the north limb of the dome, localized top-to-S faulting on the southern limb of the dome, and crustal doming (D-3) and continued N-S contraction, E-W extension and doming (D-4). Structural and geochronologic variability amongst adjacent North Himalayan gneiss domes may reflect changes in the magnitude of crustal exhumation along the North Himalayan antiform, possibly relating to differences in the mid-crustal geometry of the exhuming fault systems. (c) 2007 Elsevier B.V. All rights reserved.
WOS关键词	HIMALAYAN GNEISS DOMES ; TECTONIC EVOLUTION ; KANGMAR DOME ; METAMORPHISM ; CRUST ; AGES ; CREEP ; ZONE ; LEUKOGRANITES ; CONSTRAINTS
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000252696600008
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/68797]
专题	中国科学院地质与地球物理研究所
通讯作者	Quigley, M. C.
作者单位	1.Univ Melbourne, Sch Earth Sci, Parkville, Vic 3010, Australia 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia
推荐引用方式 GB/T 7714	Quigley, M. C.,Liangjun, Y.,Gregory, C.,et al. U-PbSHRIMP zircon geochronology and T-t-d history of the Kampa Dome, Southern Tibet[J]. TECTONOPHYSICS,2008,446(1-4):97-113.
APA	Quigley, M. C..,Liangjun, Y..,Gregory, C..,Corvino, A..,Sandiford, M..,...&Xiaohan, L..(2008).U-PbSHRIMP zircon geochronology and T-t-d history of the Kampa Dome, Southern Tibet.TECTONOPHYSICS,446(1-4),97-113.
MLA	Quigley, M. C.,et al."U-PbSHRIMP zircon geochronology and T-t-d history of the Kampa Dome, Southern Tibet".TECTONOPHYSICS 446.1-4(2008):97-113.