Early Mesoproterozoic arc magmatism followed by early Neoproterozoic granulite facies metamorphism with a near-isobaric cooling path at Mount Brown, Princess Elizabeth Land, East Antarctica

doi:10.1016/j.precamres.2016.08.003

	Early Mesoproterozoic arc magmatism followed by early Neoproterozoic granulite facies metamorphism with a near-isobaric cooling path at Mount Brown, Princess Elizabeth Land, East Antarctica
	Liu, Xiaochun 1; Wang, Wei-(R. Z. )1; Zhao, Yue 1; Liu, Jian 1; Chen, Hong 1; Cui, Yingchun 2; Song, Biao 3
刊名	PRECAMBRIAN RESEARCH
	2016-10
卷号	284 页码:30-48
关键词	Early Mesoproterozoic Arc magmatism Early Neoproterozoic Granulite facies metamorphism Rayner Complex East Antarctica
ISSN号	0301-9268
DOI	10.1016/j.precamres.2016.08.003
英文摘要	Mount Brown is a unique inland outcrop between Prydz Bay and Denman Glacier that provides useful insights into the tectonic evolution of the Indian Ocean sector of Antarctica. The bedrock in this area is dominated by felsic orthogneisses with subordinate amounts of mafic granulites, anatectic paragneisses and pegmatite veins. Sensitive high-resolution ion microprobe (SHRIMP) U-Pb zircon dating reveals the emplacement of mafic granulite and felsic orthogneiss protoliths at ca. 1490-1400 Ma, sedimentation of paragneiss precursors after ca. 1250 Ma, and subsequent high-grade metamorphism accompanied by partial melting at ca. 920-900 Ma. The trace element geochemistry of these early Mesoproterozoic mafic-felsic igneous rocks indicates that they formed in a continental arc setting. Nd isotopic compositions for these rocks yield initial epsilon(Nd) values ranging from +2.8 to -6.6 and Nd depleted mantle model ages clustering between 2.4 and 1.7 Ga, implying a significant crustal formation in the Paleoproterozoic. Petrographic textures, mineral compositions, and pressure-temperature (P-T) pseudosection calculations for mafic granulite and paragneiss in the system NC(K)FMASHTO [Na2O-CaO(-K2O)-FeO-MgO-Al2O3-SiO2-H2O-TiO2-Fe2O3] system suggest that early Neoproterozoic metamorphism reached peak P-T conditions of 830-870 degrees C and 7-8 kbar, followed by near-isobaric cooling to 760-830 degrees C and 7-8.5 kbar. The age spectra and characteristics of geological events at Mount Brown are similar to those in the Rayner Complex, thereby supporting an eastward continuation of the Rayner orogen to Wilhelm II Land. Combined with existing data, we infer that a protracted tectonic evolution between the Indian craton and East Antarctica (possibly the Ruker craton) might have occurred for a period of ca. 600 Myr from long-lived oceanic subduction-accretion at ca. 1500-1000 Ma to final collision at ca. 1000-900 Ma. (C) 2016 Elsevier B.V. All rights reserved.
资助项目	Geological Investigation Project of the Chinese Geological Survey[12120113019000]
WOS关键词	MINERAL EQUILIBRIA CALCULATIONS ; U-PB GEOCHRONOLOGY ; AMERY ICE SHELF ; T-T PATHS ; CHARLES MOUNTAINS ; PRYDZ-BAY ; METAPELITIC GRANULITES ; GHATS BELT ; SYSTEM K2O-FEO-MGO-AL2O3-SIO2-H2O-TIO2-FE2O3 ; ISOPLETH THERMOBAROMETRY
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000384864900003
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/25994]
专题	自然资源部第一海洋研究所
通讯作者	Liu, Xiaochun
作者单位	1.Chinese Acad Geol Sci, Inst Geomech, 11 Minzudaxue Nanlu, Beijing 100081, Peoples R China 2.State Ocean Adm, Inst Oceanog 1, Qingdao 266061, Peoples R China 3.Chinese Acad Geol Sci, Inst Geol, Beijing SHRIMP Ctr, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Liu, Xiaochun,Wang, Wei-,Zhao, Yue,et al. Early Mesoproterozoic arc magmatism followed by early Neoproterozoic granulite facies metamorphism with a near-isobaric cooling path at Mount Brown, Princess Elizabeth Land, East Antarctica[J]. PRECAMBRIAN RESEARCH,2016,284:30-48.
APA	Liu, Xiaochun.,Wang, Wei-.,Zhao, Yue.,Liu, Jian.,Chen, Hong.,...&Song, Biao.(2016).Early Mesoproterozoic arc magmatism followed by early Neoproterozoic granulite facies metamorphism with a near-isobaric cooling path at Mount Brown, Princess Elizabeth Land, East Antarctica.PRECAMBRIAN RESEARCH,284,30-48.
MLA	Liu, Xiaochun,et al."Early Mesoproterozoic arc magmatism followed by early Neoproterozoic granulite facies metamorphism with a near-isobaric cooling path at Mount Brown, Princess Elizabeth Land, East Antarctica".PRECAMBRIAN RESEARCH 284(2016):30-48.