Genetic mineralogy and metamorphic evolution of mafic high-pressure (HP) granulites from the Shandong Peninsula, China.

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	Genetic mineralogy and metamorphic evolution of mafic high-pressure (HP) granulites from the Shandong Peninsula, China.
	Liu, PH (Liu PingHua); Liu, FL (Liu FuLai); Wang, F (Wang Fang); Liu, JH (Liu JianHui)
刊名	ACTA PETROLOGICA SINICA
	2010
卷号	26 期号:7 页码:2039-2056
关键词	Mafic high-pressure granulites Genetic mineralogy P-T path Shandong Peninsula
ISSN号	1000-0569
英文摘要	Mafic high-pressure (HP) granulites as enclaves and irregular vein-like blocks are widespread distributed in TTG gneiss in the Pingdu-Laixi-Laiyang-Yantai area of Shandong Peninsula, southeastern Sino-Korean craton. On the basis of petrography, mineral transformation, metamorphic reaction integrated with garnet, clinopyroxene and plagioclase zonation patterns, four stages of the metamorphic evolution have been identified in mineral assemblages, including early prograde metamorphic stage (M(1)), peak HP granulite-facies metamorphic stage (M(2)), near isothermal decompression granulite-facies retrograde stage (M(3)), and late amphibolite-facies retrograde stage (M(4)). The P-T conditions for each metamorphic stage were estimated using thermodynamical and experimental geothermometers and geobarometers. The core of garnet, together with mineral inclusions, is regarded as a prograde assemblage (M(1)) of garnet + clinopyroxene + plagioclase +/- quartz, which formed at 740 similar to 770 degrees C and 0.9 similar to 1.0GPa. The peak HP granulite-facies metamorphism (M(2)) is defined by high-Ca cores in garnet, high-Al cores in clinopyroxene and high-Na cores in plagioclase +/- quartz as matrix minerals, yielding 850 similar to 880 C and 1.45 similar to 1.65GPa. Symplectites or coronas of orthopyroxene + clinopyroxene + plagioclase + magnetite +/- amphibole around garnet porphyroblasts indicate garnet decompressional reactions (M,) occurring at P-T conditions of 780 similar to 830 degrees C and 0.65 similar to 0.85GPa. Symplectites of amphibole + plagioclase + magnetite +/- quartz surrounding garnet formed at a cooling retrograde stage (M(4)) with P-T conditions of 590 similar to 650 degrees C and 0.62 similar to 0.82GPa. These data indicate that the mafic HP granulites record an integrated P-T path including prograde, near-isothermal decompression (ITD) and near-isobaric cooling (IBC) evolutional process. The clockwise ITD and IBC P-T paths of the mafic HP granulites in the Shandong Peninsula support a geodynamic model of crust thickening followed by extension in a continent-continent collisional orogen.
学科主题	变质岩岩石学
WOS关键词	U-PB ZIRCON ; TEMPERATURE TIME PATHS ; FE-MG GEOTHERMOMETER ; NORTH CHINA ; TECTONIC IMPLICATIONS ; CRUSTAL EVOLUTION ; GEOTECTONIC SIGNIFICANCE ; REGIONAL METAMORPHISM ; GREENLAND CALEDONIDES ; FACIES METAMORPHISM
WOS研究方向	Geology
语种	中文
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000280658100007
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39163]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Liu, PH ,Liu, FL ,Wang, F ,et al. Genetic mineralogy and metamorphic evolution of mafic high-pressure (HP) granulites from the Shandong Peninsula, China.[J]. ACTA PETROLOGICA SINICA,2010,26(7):2039-2056.
APA	Liu, PH ,Liu, FL ,Wang, F ,&Liu, JH .(2010).Genetic mineralogy and metamorphic evolution of mafic high-pressure (HP) granulites from the Shandong Peninsula, China..ACTA PETROLOGICA SINICA,26(7),2039-2056.
MLA	Liu, PH ,et al."Genetic mineralogy and metamorphic evolution of mafic high-pressure (HP) granulites from the Shandong Peninsula, China.".ACTA PETROLOGICA SINICA 26.7(2010):2039-2056.