Cretaceous Exhumation of Proterozoic Carbonatite on the Northern Margin   of the North China Craton Constrained by Apatite Fission-Track and   (U-Th)/He Geochronology

doi:10.1086/693094

CORC > 北京大学 > 地球与空间科学学院

	Cretaceous Exhumation of Proterozoic Carbonatite on the Northern Margin of the North China Craton Constrained by Apatite Fission-Track and (U-Th)/He Geochronology
	Wu, Lin ; Liu, Yan ; Wang, Fei ; Zeng, Liang ; Yang, Liekun ; Tian, Yuntao ; Zhang, Weibin
刊名	JOURNAL OF GEOLOGY
	2017
关键词	METAMORPHIC CORE COMPLEX ZIRCON U-PB MESOZOIC EXTENSIONAL TECTONICS LOW-TEMPERATURE THERMOCHRONOMETRY ALKALINE-RICH INTRUSIONS DALUCAO REE DEPOSIT SINO-KOREAN CRATON BOHAI BAY BASIN INNER-MONGOLIA HELIUM DIFFUSION
DOI	10.1086/693094
英文摘要	Some carbonatites related to Proterozoic rift activities developed on the northern margin of the North China Craton and have a close genetic relationship with certain types of mineralization. We obtained new fission-track and (U-Th)/He geochronological data from fragments of pegmatitic apatite that coexists with Proterozoic igneous carbonatite along the border of three provinces (Hebei, Shanxi, and Inner Mongolia). Twenty fragments yielded a fission-track central age of 124.1 +/- 6.5 Ma (1 sigma). Thermal-history inversion and track-length distribution suggest rapid Early Cretaceous cooling through the apatite partial-annealing zone. Sixteen single-fragment apatite (U-Th)/He ages range between 82.2 +/- 1.8 and 109.6 +/- 2.3 Ma, with the age variation much larger than the analytical uncertainty. Several reasons could account for this dispersion. While alpha-particle redistribution resulted from U and Th inhomogeneties, chemical variations and radiation damage are the most probable causes. We calculated the mean age, central age, and isochron age of all the analyzed fragments and got a consistent statistical age of approximate to 100 Ma, which can be used as the best estimation of the cooling age for the pegmatitic apatite. This result also suggests that the Proterozoic carbonatite was exhumed to a subsurface level during the late Early Cretaceous and was not buried deeper than 2-3 km since then, a situation that provided favorable conditions for the preservation of some ore deposits. The denudation of the Proterozoic rocks was consistent with widespread crustal extension, represented by formation of metamorphic core complexes and rift basins, reactivation of normal faults, and rapid exhumation of granites on the eastern Asian continent. These new low-temperature geological data shed some light on the denudation and preservation of related mineral deposits.; National Natural Science Foundation of China (NSFC) [41503055, 41521062]; Ministry of Science and Technology of the People's Republic of China [2016 YFC0600109]; SCI(E); ARTICLE; 5; 593-606; 125
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/471226]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Wu, Lin,Liu, Yan,Wang, Fei,et al. Cretaceous Exhumation of Proterozoic Carbonatite on the Northern Margin of the North China Craton Constrained by Apatite Fission-Track and (U-Th)/He Geochronology[J]. JOURNAL OF GEOLOGY,2017.
APA	Wu, Lin.,Liu, Yan.,Wang, Fei.,Zeng, Liang.,Yang, Liekun.,...&Zhang, Weibin.(2017).Cretaceous Exhumation of Proterozoic Carbonatite on the Northern Margin of the North China Craton Constrained by Apatite Fission-Track and (U-Th)/He Geochronology.JOURNAL OF GEOLOGY.
MLA	Wu, Lin,et al."Cretaceous Exhumation of Proterozoic Carbonatite on the Northern Margin of the North China Craton Constrained by Apatite Fission-Track and (U-Th)/He Geochronology".JOURNAL OF GEOLOGY (2017).