Exsolution microstructures in ultrahigh-pressure rocks: Progress, controversies and challenges |
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Authors: | Liang Liu JiaXi Yang JunFeng Zhang DanLing Chen Chao Wang WenQiang Yang |
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Institution: | (1) State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an, 710069, China;(2) College of Earth Sciences and Land Resources, Chang’an University, Xi’an, 710054, China;(3) State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China |
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Abstract: | Exsolution microstructures in minerals of rocks from orogenic belts played an important role in recognition of ultrahigh-pressure
(UHP) metamorphism in their host rocks by defining the subduction depth and improving our understanding of the dynamics during
the subduction and exhumation of UHP rocks. However, it is a challenging scientific topic to distinguish the ‘exsolution microstructures’
from the ‘non-exsolution microstructures’ and decipher their geological implications. This paper describes the subtle differences
between the ‘exsolution microstructures’ and the ‘non-exsolution microstructures’ and summarizes the progress in studies of
exolution microstructures from UHP rocks and mantle rocks of ultra-deep origin. We emphasize distinguishing the ‘exsolution
microstructures’ from the ‘non-exsolution microstructures’ based on their geometric topotaxy and chemistry. In order to decipher
correctly the exsolution microstructures, it is crucial to understand the changes of chemistry and habits of host minerals
with pressure and temperature. Therefore, it is important to combine observations of exsolution microstructure in natural
rocks with experimental results at high pressure and temperature and results of micro-scale analyses. Such studies will improve
our understanding of the UHP metamorphism and cast new lights on solid geoscience issues such as deep subduction of continental
crusts and crust-mantle interactions.
Supported by a special grant from the Ministry of Science and Technology of China for the State Key Laboratory of Continental
Dynamics of Northwest University, National Basic Research Program of China (Grant No. 2009CB825003) and National Natural Science
Foundation of China (Grant Nos. 40572111, 40372088, 40472043 and 40502021) |
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Keywords: | Keyword" target="_blank">Keyword ultra-high pressure metamorphism exsolution exsolution microstructure exsolution identification features high pressure and temperature experiment |
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