The discovery of the Neoarchean mafic dyke swarm in Hengshan and reinterpretation of the previous “Wutai greenstone belt” |
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| Authors: | Jianghai Li A Kr?ner Xiongnan Huang and Zhiqiang Zhang |
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| Institution: | (1) Department of Geology, Peking University, 100871 Beijing, China;(2) Institut fuer Geowissenschaften Universitaet Mainz, 55099, Mainz, Germany |
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| Abstract: | The structural mapping and section study indicate that the “greenstone belts” in the southern to central parts of Hengshan
were intensively sheared and transposed mafic dyke swarm, which originally intruded into the Neoarchean grey gneiss and high-pressure
granulite terrain (HPGT). The HPGT is characterized by flat-dipping structures, to the south it became steep and was cut by
the Dianmen mafic dyke swarm. After high-pressure granulite-facies metamorphic event, the mafic dyke swarm occurred, and was
associated with the extensional setting and reworked by the late strike-slip shearing. The zircon age dating proves that the
Dianmen mafic dyke swarm was emplaced during the period between 2499±4 Ma and 2512±3 Ma, followed by late tectonothermal reworking.
The Dianmen mafic dyke swarm further documents the extensional episode in the central to northern parts of North China Craton
(NCC), providing the important constraint for the limit between Archean and Proterozoic and correlation between NCC and other
cratonic blocks of the world. |
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| Keywords: | mafic dyke swarm extensional tectonics isotopic age dating structural pattern craton limit between Archean and Proterozoic |
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