Late Paleoproterozoic medium-P high grade metamorphism of basement rocks beneath the northern margin of the Ordos Basin, NW China: Petrology, phase equilibrium modelling and U-Pb geochronology

doi:10.1016/j.precamres.2014.06.016

	Late Paleoproterozoic medium-P high grade metamorphism of basement rocks beneath the northern margin of the Ordos Basin, NW China: Petrology, phase equilibrium modelling and U-Pb geochronology
	Wang, Wei-(RZ)5; Liu, Xinshe 1; Hu, Jianmin ; Li, Zhenhong ; Zhao, Yue ; Zhai, Mingguo 2; Liu, Xiaochun ; Clarke, Geoffrey 3; Zhang, Shuanhong ; Qu, Hongjie
刊名	PRECAMBRIAN RESEARCH
	2014
卷号	251 页码:181-196
关键词	Ordos Granulite Paleoproterozoic Zircon dating THERMOCALC
ISSN号	0301-9268
DOI	10.1016/j.precamres.2014.06.016
英文摘要	Basement rocks from drill cores at the northern margin of the Ordos Basin were investigated by integrating petrography, geochronological analysis and mineral equilibria modelling in the Na2O-CaO-K2O-FeO-MgO-Al2O3-SiO2-H2O-TiO2-O system. The P-T conditions constrained by mineral compositional isopleths on calculated pseudosections indicate that the rocks underwent medium-pressure high grade metamorphism. The pelitic rocks reached granulite fades with peak P-T conditions of 780-810 degrees C at c. 63-7.8 kbar. SHRIMP U-Pb analyses of detrital zircons indicate Paleoproterozoic protoliths for the basement rocks. NanoSIMS U-Pb analyses of metamorphic overgrowths on zircon grains yield upper intercept ages of 1964 +/- 21 and 1960 +/- 21 Ma for pelitic (QT1-2) and psammitic (LT1-2) samples, respectively. The basement rocks are petrologically, geochronologically and metamorphically comparable with rocks from the Khondalite Belt, which posits the existence of khondalite series rocks beneath the northern margin of the Ordos Basin. Therefore, the Paleoproterozoic mobile belt between the Yinshan and Ordos blocks is likely to be wider than previously thought. (C) 2014 Elsevier B.V. All rights reserved.
学科主题	前寒武纪地质
WOS关键词	PRESSURE PELITIC GRANULITES ; EFFECTIVE BULK-COMPOSITION ; LIAO-JI BELT ; T-T PATHS ; TECTONIC IMPLICATIONS ; KHONDALITE BELT ; ZIRCON AGES ; MINERAL EQUILIBRIA ; WESTERN BLOCK ; ISOPLETH THERMOBAROMETRY
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000340225000011
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/41049]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China 2.PetroChina, Changqing Oilfield Co, Res Inst Explorat & Dev, Xian 710018, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 4.Univ Sydney, Sch Geosci, Sydney, NSW 2006, Australia 5.中国地质科学院地质力学研究所
推荐引用方式 GB/T 7714	Wang, Wei-,Liu, Xinshe,Hu, Jianmin,et al. Late Paleoproterozoic medium-P high grade metamorphism of basement rocks beneath the northern margin of the Ordos Basin, NW China: Petrology, phase equilibrium modelling and U-Pb geochronology[J]. PRECAMBRIAN RESEARCH,2014,251:181-196.
APA	Wang, Wei-.,Liu, Xinshe.,Hu, Jianmin.,Li, Zhenhong.,Zhao, Yue.,...&Qu, Hongjie.(2014).Late Paleoproterozoic medium-P high grade metamorphism of basement rocks beneath the northern margin of the Ordos Basin, NW China: Petrology, phase equilibrium modelling and U-Pb geochronology.PRECAMBRIAN RESEARCH,251,181-196.
MLA	Wang, Wei-,et al."Late Paleoproterozoic medium-P high grade metamorphism of basement rocks beneath the northern margin of the Ordos Basin, NW China: Petrology, phase equilibrium modelling and U-Pb geochronology".PRECAMBRIAN RESEARCH 251(2014):181-196.