Metamorphism and zircon U–Pb dating of garnet amphibolite in the Baoyintu Group, Inner Mongolia

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• 作者：Yaping Chen ; Chunjing Wei ; Jinrui Zhang ; Hang Chu
• 关键词：Amphibolite ; P–T pseudosection ; Zircon U–Pb dating ; Baoyintu Group ; Central Asian Orogenic Belt ; /li> P ; T ; U ; Pb ; ; /li>
• 刊名：Chinese Science Bulletin
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：60
• 期：19
• 页码：1698-1707
• 全文大小：3,104 KB
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• 作者单位：Yaping Chen (1)
  Chunjing Wei (1)
  Jinrui Zhang (1)
  Hang Chu (2)
  
  1. Key Laboratory of the Orogenic Belt and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing, 100871, China
  2. Tianjing Institute of Geology and Mineral Resources, Tianjin, 300170, China
  
• 刊物主题：Science, general; Life Sciences, general; Physics, general; Chemistry/Food Science, general; Earth Sciences, general; Engineering, general;
• 出版者：Springer Berlin Heidelberg
• ISSN：1861-9541

文摘

Garnet amphibolite in the Baoyintu Group, Inner Mongolia, is mainly composed of garnet, hornblende, plagioclase, quartz and minor rutile/ilmenite. Garnet occurs as porphyroblasts surrounded by plagioclase, forming typical “white-eye socket-texture. Garnet shows grossular content of 0.26-.28 and pyrope of 0.11-.13, without significant zoning. Plagioclase is generally zoned with anorthite (An) increasing from core to rim. The P-em class="EmphasisTypeItalic ">T pseudosection calculated using THERMOCALC in the system MnNCKFMASHTO shows that the garnet amphibolite experienced a clockwise P-em class="EmphasisTypeItalic ">T path with a peak at ~1.3 GPa/725 °C defined from the minimum An content in plagioclase and maximum pyrope content in garnet, followed by an isothermal decompression. LA-ICP-MS zircon dating for the garnet amphibolite indicates metamorphic ages of 399 ± 6 Ma. The peak P-em class="EmphasisTypeItalic ">T condition corresponds to a thermal gradient of ~18 °C/km, indicating typical medium-pressure type that commonly occurs in orogenic process with crustal thickening. We prefer to interpret this orogenic event to be a result of collision, following the closure of the Paleo-Asian Ocean before the early Devonian although there is a popular view that the Paleo-Asian Ocean may have lasted to the early Mesozoic. Keywords Amphibolite P-em class="EmphasisTypeItalic ">T pseudosection Zircon U–Pb dating Baoyintu Group Central Asian Orogenic Belt