Petrological and geochronological preliminary study of the Xiliu similar;to 2.1Ga meta-gabbro from the Jiaobei terrane, the southern segment of;the Jiao-Liao-Ji Belt in the North China Craton

	Petrological and geochronological preliminary study of the Xiliu similar;to 2.1Ga meta-gabbro from the Jiaobei terrane, the southern segment of;the Jiao-Liao-Ji Belt in the North China Craton
	Liu PingHua 2; Liu FuLai ; Wang Fang ; Liu JianHui ; Cai Jia
刊名	ACTA PETROLOGICA SINICA
	2013
卷号	29 期号:7 页码:2371-2390
关键词	Jiaobei Paleoproterozoic Meta-gabbro Petrology Geochronology
ISSN号	1000-0569
英文摘要	The Xiliu meta-gabbros are composed predominantly of orthopyroxene-clinopyroxene granulites and clinopyroxene amphibolites, and are found as irregular lenses within the Neoachean granitic and tonalitic gneisses in the Jiaobei terrane. On the basis of petrography, mineral transformation, mineral composition, temperature-pressure estimation and in situ U-Pb dating of zircons, three distinct mineral assemblages of the meta-gabbros have been identified by the characteristics of mineral reactions and evolutions. The relict ophitic and gabbro textures represent the early index igneous textures. High-augite core in clinopyroxene is regarded as one of the early igneous assemblage (M-0). The magmaitic zircons record a weighted mean Pb-207/Pb-206 age of 2102 +/- 3Ma, which represents the magmatic crystallization timing of the meta-gabbros. The granulite-facies metamorphism (M-1) is defined by the mineral assemblage of orthopyroxene + clinopyroxene + plagioclase + quartz, which formed at 800 similar to 850 degrees C and less than 0.65 similar to 0.75GPa. The mineral assemblage of amphibole + plagioclase + quartz formed at a cooling retrograde stage (M-2) with P-T conditions of 675 similar to 700 degrees C and 0.40 similar to 0.55GPa. The metamorphic zircon records a younger Pb-207/Pb-206 age of 1907 +/- 16Ma, which represent the timing of the granulite-amphibolite facies metamorphism of the meta-gabbros. These data indicate that the meta-gabbros record a clockwise P-T path involving near-isobaric cooling (IBC) process. Combined with other investigations of the Jiaobei terrane, it was suggested that the Xiliu meta-gabbros were formed by crustal extension before the deposition of Paleoproterozoic strata, and were involved in the Late Paleoproterozoic (1.95 similar to 1.80Ga) collisional orogenic process in the Jiaobei terrane.
学科主题	变质岩岩石学
WOS关键词	U-PB ZIRCON ; PRECAMBRIAN METAMORPHIC BASEMENT ; PRESSURE PELITIC ; GRANULITES ; SHANDONG PENINSULA ; CRUSTAL EVOLUTION ; EASTERN BLOCK ; TECTONIC IMPLICATIONS ; MAFIC GRANULITE ; T PATH ; CONSTRAINTS
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000322926000008
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40068]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China. 2.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Liu PingHua,Liu FuLai,Wang Fang,et al. Petrological and geochronological preliminary study of the Xiliu similar;to 2.1Ga meta-gabbro from the Jiaobei terrane, the southern segment of;the Jiao-Liao-Ji Belt in the North China Craton[J]. ACTA PETROLOGICA SINICA,2013,29(7):2371-2390.
APA	Liu PingHua,Liu FuLai,Wang Fang,Liu JianHui,&Cai Jia.(2013).Petrological and geochronological preliminary study of the Xiliu similar;to 2.1Ga meta-gabbro from the Jiaobei terrane, the southern segment of;the Jiao-Liao-Ji Belt in the North China Craton.ACTA PETROLOGICA SINICA,29(7),2371-2390.
MLA	Liu PingHua,et al."Petrological and geochronological preliminary study of the Xiliu similar;to 2.1Ga meta-gabbro from the Jiaobei terrane, the southern segment of;the Jiao-Liao-Ji Belt in the North China Craton".ACTA PETROLOGICA SINICA 29.7(2013):2371-2390.