Preliminary study of petrology and U-Pb zircon dating of the Nanshankou garnet-bearing pyroxenolites from the Jiaobei terrane, the southeastern segment of the Jiao-Liao-Ji Belt in the North China Craton

	Preliminary study of petrology and U-Pb zircon dating of the Nanshankou garnet-bearing pyroxenolites from the Jiaobei terrane, the southeastern 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
	2014
卷号	30 期号:10 页码:2951-2972
关键词	Garnet-bearing pyroxenolites Petrology U-Pb zircon dating Jiaobei North China Craton
ISSN号	1000-0569
英文摘要	The Nanshankou mafic-ultramafic complex are composed mainly of garnet-baring pyroxenolites and garnet-bearing mafic granulites, and found as irregular lenses within the Archean tonalitic gneisses within the Jiaobei terrane, the southeastern segment of the Jiao-Liao-Ji Belt of the North China Craton. An integrated study involving petrographic observation and analysis of mineral transformation and mineral chemistry, shows that the Nanshankou garnet-bearing pyroxenolites contain the near-isothermal and decompressive metamorphic textures, such as garnet + Ca-rich liquid -> clinopyxene + prehnite + sphene +/- albite and garnet + Ca-rich liquid + CO2 -> amphibole + prehnite +/- albite +/- calcite +/- sphene, indicating that the Nanshankou garnet-bearing pyroxenolites have ever undergone a high-pressure granulite-facies metamorphism. In addition, just like the Nanshankou garnet-bearing mafic granulites, the Nanshankou garnet-bearing pyroxenolites have undergone strongly calcic metasomatism during the late cooling retrograde stage and formed the typical Ca-rich mineral assemblage such as grossular-rich garnet + sahlitic clinopyxene + Ca-rich amphibole + prehnite + albite + calcite + sphene. SHRIMP U-Pb dating of zircons from the Nanshankou garnet-bearing pyroxenolites demonstrate that the magmatic zircons record the older Pb-207/Pb-206 ages of 2900 similar to 2850Ma, representing the timing of the Late Mesoarchean magmatic event in the Jiaobei terrane, and metamorphic zircons record the younger Pb-207/Pb-206 ages of 1950 similar to 1800Ma, interpreted as the timing of the Late Paleoproterozoic regional collisional orogenesis of the Jiaobei terrane. Combined with other geological data of the Jiao-Liao-Ji Belt, it is speculated that the Nanshankou mafic-ultramafic rocks were probably formed at Paleoprterozoic era, belong to the representative Paleoproterozoic rock associations within the Jiao-Liao-Ji Belt, were involved in the Late Paleoproterozoic (1950 similar to 1800Ma) crustal orogenesis of the Jiao-Liao-Ji Belt, have probably undergone the peak high-pressure granulite-facies metamorphism and the late cooling retrograde metamorphism and calcic metasomatism.
学科主题	变质岩岩石学
WOS关键词	HIGH-PRESSURE GRANULITES ; PALEOPROTEROZOIC CRUSTAL EVOLUTION ; PRECAMBRIAN METAMORPHIC BASEMENT ; SHANDONG PENINSULA ; TECTONIC IMPLICATIONS ; EASTERN SHANDONG ; MAFIC GRANULITE ; PENGLAI GROUP ; T PATH ; GEOTECTONIC SIGNIFICANCE
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000344215200012
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40496]
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. Preliminary study of petrology and U-Pb zircon dating of the Nanshankou garnet-bearing pyroxenolites from the Jiaobei terrane, the southeastern segment of the Jiao-Liao-Ji Belt in the North China Craton[J]. ACTA PETROLOGICA SINICA,2014,30(10):2951-2972.
APA	Liu PingHua,Liu FuLai,Wang Fang,Liu JianHui,&Cai Jia.(2014).Preliminary study of petrology and U-Pb zircon dating of the Nanshankou garnet-bearing pyroxenolites from the Jiaobei terrane, the southeastern segment of the Jiao-Liao-Ji Belt in the North China Craton.ACTA PETROLOGICA SINICA,30(10),2951-2972.
MLA	Liu PingHua,et al."Preliminary study of petrology and U-Pb zircon dating of the Nanshankou garnet-bearing pyroxenolites from the Jiaobei terrane, the southeastern segment of the Jiao-Liao-Ji Belt in the North China Craton".ACTA PETROLOGICA SINICA 30.10(2014):2951-2972.