Paleoproterozoic granulites from Heling'er: Implications for regional;ultrahigh-temperature metamorphism in the North China Craton

	Paleoproterozoic granulites from Heling'er: Implications for regional;ultrahigh-temperature metamorphism in the North China Craton
	Liu, Shoujie 6; Tsunogae, Toshiaki ; Li, Wenshan ; Shimizu, Hisako ; Santosh, M.; Wan, Yusheng ; Li, Jianghai
刊名	LITHOS
	2012
卷号	148 页码:54-70
关键词	Ultrahigh-temperature metamorphism Spinel-quartz assemblage Pseudosection modeling Ti-in-zircon geothermometry North China Craton
ISSN号	996AG
英文摘要	The Inner Mongolia Suture Zone (IMSZ, incorporating the Khondalite Belt) forms part of an accretionary orogen developed during the Paleoproterozoic collision between the Yinshan Block and Ordos Blocks within the North China Craton (NCC). The granulites within the IMSZ are characterized by high-temperature (HT) to ultrahigh-temperature (UHT) metamorphism with diagnostic mineral assemblages for UHT conditions preserved in some localities such as Tuguiwula and Wuchuan. We report here a new locality in Heling'er, located within the southern domain of the IMSZ where spinel-garnet-sillimanite-bearing granulites record UHT metamorphic conditions. The prograde assemblages occurring as inclusions in porphyroblastic minerals in these rocks include sillimanite + quartz + spinet, whereas coarse grained garnet + sillimanite + quartz + spinel + cordierite + plagioclase + K-feldspar + magnetite + ilmenite represent the peak assemblages. The retrograde stage is marked by orthopyroxene and cordierite rims developed on garnet and spinel. Biotite marks the final hydration stage of the high-grade metamorphism. Spinel and quartz occur in direct contact, with the spinel showing low Zn. Cr, and Fe3+. Application of Ti-in-zircon and ternary feldspar geothermometers yields temperatures up to similar to 940 degrees C for the peak stage. Mineral phase equilibria modeling based on the bulk chemistry and mineral assemblages shows that the peak assemblage of garnet + plagioclase + spinet + cordierite + sillimanite + quartz + ilmenite + magnetite was stabilized at 1030 degrees C at 6.5-7.5 kbar, thus we infer a 940-1030 degrees C temperature range for peak metamorphism in these rocks. The newly discovered UHT rocks in Heling'er, dated as 1.92 Ga, together with the two previously reported UHT localities at Tuguiwula and Wuchuan, suggest that the Paleoproterozoic UHT metamorphism occurred on a regional scale within the IMSZ, probably in association with the subduction-accretion-collision tectonics and the incorporation of the NCC within the Columbia supercontinent. (C) 2012 Elsevier B.V. All rights reserved.
学科主题	变质岩岩石学
WOS关键词	U-PB GEOCHRONOLOGY ; TI-IN-ZIRCON ; KHONDALITE BELT ; CRUSTAL METAMORPHISM ; WESTERN BLOCK ; JINING COMPLEX ; DETRITAL ZIRCONS ; EAST ANTARCTICA ; INNER-MONGOLIA ; TECTONIC SIGNIFICANCE
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	We are grateful to Lithos Editor Prof. Marco Scambelluri, and reviewers;Prof. Guochun Zhao and an anonymous referee for the very helpful;comments which greatly improved the manuscript. We thank Dr. Fang Ma at;the ICP-MS laboratory at Peking University for the help with the;Ti-in-zircon analysis. We also show our gratitude to Guiming Shu and;Changqiu Wang at Peking University and Zhenyu Chen at the Institute of;Mineral Resources, Chinese Academy of Geological Sciences for the help;with the EMPA analysis. National Research Center of Geo-analysis,;Chinese Academy of Geological Sciences is thanked for the help with the;XRF analysis. This work is supported by the National Natural Science;Foundation of China (40672127), Basic Research Special Found from;Institute of Geology (J1113), Chinese Academy of Geological Sciences and;China MOST 973 Programme grant (2009CB219302).
WOS记录号	WOS:000308055800005
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39659]
专题	中国地质科学院地质研究所
作者单位	1.Acad Geol Sci, Inst Geol China, Beijing SHRIMP Ctr, Beijing 100037, Peoples R China. 2.Univ Tsukuba, Grad Sch Life & Environm Sci, Ibaraki 3058572, Japan. 3.Peking Univ, Sch Earth & Space Sci, Lab Orogen Belt & Crustal Evolut, Beijing 100871, Peoples R China. 4.Kochi Univ, Fac Sci, Div Interdisciplinary Sci, Kochi 7808520, Japan. 5.China Univ Geosci, Journal Ctr, Beijing 100083, Peoples R China. 6.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Liu, Shoujie,Tsunogae, Toshiaki,Li, Wenshan,et al. Paleoproterozoic granulites from Heling'er: Implications for regional;ultrahigh-temperature metamorphism in the North China Craton[J]. LITHOS,2012,148:54-70.
APA	Liu, Shoujie.,Tsunogae, Toshiaki.,Li, Wenshan.,Shimizu, Hisako.,Santosh, M..,...&Li, Jianghai.(2012).Paleoproterozoic granulites from Heling'er: Implications for regional;ultrahigh-temperature metamorphism in the North China Craton.LITHOS,148,54-70.
MLA	Liu, Shoujie,et al."Paleoproterozoic granulites from Heling'er: Implications for regional;ultrahigh-temperature metamorphism in the North China Craton".LITHOS 148(2012):54-70.