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40Ar/39Ar dating of hornblende and U-Pb dating of zircon in the Aketashitage orogen, NW China: constraints on exhumation and cooling in the Paleoproterozoic
Precambrian Research ( IF 3.8 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.precamres.2020.106018 Qian W.L. Zhang , Zhen M.G. Li , Meng-Yan Shi , Yi-Chao Chen , Jia-Hui Liu , Chun-Ming Wu
Precambrian Research ( IF 3.8 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.precamres.2020.106018 Qian W.L. Zhang , Zhen M.G. Li , Meng-Yan Shi , Yi-Chao Chen , Jia-Hui Liu , Chun-Ming Wu
Abstract The Paleoproterozoic Aketashitage orogenic belt lies in between the two large accretionary orogenic systems, i.e., Paleo-Asian ocean and Paleo-Tethys ocean systems, in northwest China. Previous geochronologic studies reveal widespread Paleoproterozoic orogeny-related magmatism and high-grade metamorphism in this area, determined by the U-Pb dating of zircon and monazite. In this paper, 40Ar/39Ar dating of hornblende of three representative amphibolite samples yielded cooling ages of ∼1.88–1.85 Ga. Comparison of the zircon/monazite U-Pb and hornblende 40Ar/39Ar ages suggests that these amphibolite samples record different exhumation and cooling processes. These new geochronologic data further confirm that the Aketashitage orogenic belt only records Paleoproterozoic metamorphism but no overprint of Paleozoic thermal event. It is thus inferred that the Aketashitage area might act as a continental fragment/terrane which was passively collaged onto the ambilateral Paleozoic orogens but was not involved in the Paleozoic subduction.
更新日期：2021-01-01
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