the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
First report of ultra-high pressure metamorphism in the Paleozoic Dunhuang orogenic belt (NW China): Constrains from P-T paths of garnet clinopyroxenite and SIMS U-Pb dating of titanite
Abstract. Ultra-high pressure (UHP) metamorphism is recorded by garnet clinopyroxenite enclaves enclosed in an undeformed, unmetamorphosed granitic pluton, northeastern Paleozoic Dunhuang orogenic belt, northwest China. Three to four stages of metamorphic mineral assemblages have been found in the garnet clinopyroxenite, and clockwise metamorphic pressure-temperature (P-T) paths were retrieved, indicative of metamorphism of a possible subduction environment. Peak metamorphic P-T conditions (790~920 °C/28~41 kbar) of garnet clinopyroxenite suggest that they experienced high pressure to UHP metamorphism, and the UHP metamorphism occurred in the coesite- or diamond-stability field. The UHP metamorphic event is further confirmed by the occurrence of high-Al titanite enclosed in the garnet, along with at least three groups of aligned rutile lamellae exsolved from within the garnet. SIMS U-Pb dating of metamorphic titanite indicates that the post peak, subsequent tectonic exhumation of the UHP rocks occurred in the Devonian (~ 389~370 Ma). These data suggest that part of the Paleozoic Dunhuang orogenic belt experienced UHP metamorphism, and diverse metamorphic facies series prevailed in this orogen in the Paleozoic. It can be further inferred that most of the UHP rocks of this orogen are now buried in the depth.
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Interactive discussion
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RC1: 'Review of Zhen et al.', Anonymous Referee #1, 28 Jul 2020
- AC1: 'Replies to Reviewer 1', Chun-Ming Wu, 07 Sep 2020
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RC2: 'A review for the manuscript of se-2020-95', Chunjing Wei, 31 Jul 2020
- AC2: 'Replies to Reviewer 2', Chun-Ming Wu, 07 Sep 2020
Interactive discussion
-
RC1: 'Review of Zhen et al.', Anonymous Referee #1, 28 Jul 2020
- AC1: 'Replies to Reviewer 1', Chun-Ming Wu, 07 Sep 2020
-
RC2: 'A review for the manuscript of se-2020-95', Chunjing Wei, 31 Jul 2020
- AC2: 'Replies to Reviewer 2', Chun-Ming Wu, 07 Sep 2020
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Cited
Zhen M. G. Li
Hao Y. C. Wang
Qian W. L. Zhang
Meng-Yan Shi
Jun-Sheng Lu
Jia-Hui Liu
Chun-Ming Wu
This preprint has been withdrawn.
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