• Article •
Advances in Polar Science doi: 10.13679/j.advps.2018.2.00118 June 2018 Vol. 29 No. 2: 118-134
www.aps-polar
Metamorphism and zircon U-Pb dating of high-pressure
pelitic granulites from glacial moraines in the Grove
喙的读音Mountains, East Antarctica
CHEN Longyao 1*, WANG Wei 2, LIU Xiaochun 1 & ZHAO Yue 1
1 Institute of Geomechanics, Chine Academy of Geological Sciences, Beijing 100081, China ；
2 The Office of Hubei Provincial Poverty Alleviation and Development, Wuhan 430071, China
北欧风格设计理念Received 12 December 2017; accepted 28 March 2018
Abstract The Grove Mountains are an inland continuation of the Prydz Belt in East Antarctica. Detailed metamorphic
petrological and zircon U-Pb geochronological studies are performed on the high-pressure (HP) pelitic granulites from glacial
moraines in the Grove Mountains. The metamorphic peak mineral asmblage of the HP pelitic granulites is characterized by
garnet + kyanite + K-feldspar + biotite + plagiocla + quartz, and the subquent medium-pressure (MP) granulite facies
retrogression is characterized by sillimanite replacing kyanite, the formation of the biolite + sillimanite symplectite in the matrix.
The mineral asmblages and their P-T estimates bad on the P-T pudoction constructed in MnNCKFMASHT system
define a clockwi P-T path involving metamorphic peak of 11.6–13.6 kbar at 817–834°C followed by a near-isothermal
decompression of 6.7–7.5 kbar at 806–828°C, comparable with tho of associated HP mafic granulites from glacial moraines in
the Grove Mountains. Zircon U-Pb dating, coupled with available metamorphic age data obtained for HP mafic granulites,
reveals HP metamorphism occurred at 540–545 Ma. Combining the previous rearch results, the HP pelitic granulites and
contemporary HP mafic granulites were widely distributed in glacial moraines from the Grove Mountains, suggesting at least
part of the Grove Subglacial Highlands underwent Pan-Afrian HP granulite facies metamorphism, which provides new evidence
for a collisional tectonic tting of the Pan-Afrian Prydz Belt.
Keywords East Antarctica, Prydz Belt, Pan-African, HP pelitic granulite
春笋
难忘的第一次作文Citation : Chen L Y, Wang W, Liu X C, et al. Metamorphism and zircon U-Pb dating of high-pressure pelitic granulites from
古代官位等级>高铁能带宠物吗glacial moraines in the Grove Mountains, East Antarctica. Adv Polar Sci, 2018, 29(2): 118-134,
doi:10.13679/j.advps.2018.2.00118酸辣圆白菜
1 Introduction
The Prince Charles Mountains (PCM)–Prydz Bay region of
East Antarctica was previously considered to be a part of a
unified East Gondwana craton since Late Mesproterozoic/
Early Neoproterozoic (i.e. Grenvillian) (Stern, 1994; Dalziel,
1991; Hoffman, 1991; Moores, 1991). As the recognition and
confirmation of the Late Neoproterozoic/Cambrian (termed
Pan-African) high-grade tectono-thermal event in the Prydz
*Corresponding author, E-mail: Bay, the Pan-Afrian Prydz Belt has been established and distinguished from the Grenvillian terrane (Fitzsimons et al., 1997; Carson et al., 1996; Henn and Zhou, 1995; Zhao et al., 1995, 1993, 1992, 1991). However, the abnce of e
cliv
vidence for pre-collisional oceanic closure and subduction has led to a heated and ongoing debate about the tectonic nature of the Prydz Belt. There are two viewpoints about the nature of the Prydz Belt: a suture that resulted from the collision between the Indo-Antarctica and Australo- Antarctica continental blocks (e.g., Liu et al., 2013, 2009a, 2009b, 2007a, 2007b, 2006; Grew et al., 2012; Boger, 2011;
