|Table of Contents|

Characteristics of Glacial Moraines in Grove Mountains, East Antarctica: Constraints on the Subglacial Geology(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2019年第02期
Page:
127-140
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Characteristics of Glacial Moraines in Grove Mountains, East Antarctica: Constraints on the Subglacial Geology
Author(s):
CHEN Long-yao1;  WANG Wei2;  LIU Xiao-chun1;  ZHAO Yue1;  HU Jian-min1
(1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China; 2. The Office of Hubei Provincial Poverty Alleviation and Development, Wuhan 430071, Hubei, China)
Keywords:
glacial moraine;  petrology;  isotope chronology;  zircon Hf isotope;  subglacial geology;  Grove Mountains;  Prydz belt;  Antarctica
PACS:
P588.12+4
DOI:
-
Abstract:
The Grove Mountains are considered as inland continuation of Prydz belt in East Antarctica, and could provide important constraints for the tectonic nature of Prydz belt. Most of the basement in Grove Mountains is hidden beneath the ice sheet, the sparse exposures of bedrocks are insufficient to fully show the geological characteristics of the entire Grove Mountains. A number of moraine belts exposed on the glaciers of Grove Mountains may carry information about the geology of Grove subglacial highlands in greater scope and depth, and play an irreplaceable role in revealing the material composition and tectonic evolution of Grove Mountains. The types and distribution characteristics of glacial moraines in Grove Mountains were summarized, and the study on petrology, isotopic chronology and zircon Hf isotopic analysis of the glacial moraines in Grove Mountains in the recent decades was reviewed. The subglacial highlands are more complex in composition to the exposed bedrock in Grove Mountains, which only experience a single Pan-African metamorphic cycle. The wide distribution of high-pressure granulites suggests that at least part of Grove subglacial highlands undergo Pan-African high-pressure granulite facies metamorphism. In contrast with Prince Charles Mountains-Prydz Bay region, the Grove subglacial highlands have earlier metamorphic ages and higher degree of metamorphism, suggesting that the collision suture of Prydz belt should lie to the south of Grove subglacial highlands.

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