Exhumation history of the Hengchun Ridge and its implications for Taiwan orogenic processes
The orogenic evolution of Taiwan is thought to have occurred with a steady and southward propagating trend since the Late Miocene. Recent studies suggest a two-stage collision for the Taiwan orogen and that the collision occurred simultaneously along the entirety of the island of Taiwan. To test thi...
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Frontiers Media S.A.
2022-08-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.941040/full |
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| author | Pingchuan Tan Pingchuan Tan Weiwei Ding Weiwei Ding Weiwei Ding Jiabiao Li Jiabiao Li |
| author_facet | Pingchuan Tan Pingchuan Tan Weiwei Ding Weiwei Ding Weiwei Ding Jiabiao Li Jiabiao Li |
| author_sort | Pingchuan Tan |
| collection | DOAJ |
| description | The orogenic evolution of Taiwan is thought to have occurred with a steady and southward propagating trend since the Late Miocene. Recent studies suggest a two-stage collision for the Taiwan orogen and that the collision occurred simultaneously along the entirety of the island of Taiwan. To test this hypothesis, we evaluated 270 bathymetry profiles normal to the trench to constrain variations in the width, length, and crest of the Taiwan accretionary prism from the northern Central Ridge to the southern Hengchun Ridge. South of Taiwan Island, a gradual increase in the width and elevation of the accretionary prism of the Hengchun Ridge is noted. Assuming that the uplift of Hengchun Ridge is dominated by the accretion of hyper-stretched continental crust (HSCC), we estimated the uplift rate of the ridge (ca. 0.3 km/Ma) based on a linear regression between the HSCC and the observed depth of the prism crest. Using this uplift rate, we forward modeled the prism crest depth variations from 19.7°N to 23.5°N, and compared these values to observations. The model gives a good match to observations of the Hengchun Ridge, but significantly deeper depths to the north of Hengchun Peninsula. This suggests that the Taiwan orogeny had two stages: the first stage was dominated by structurally underplated HSCC, and the second is a combination of the arrival of the continental shelf and arc–continent collision. In addition to the widely accepted arc–continent collision, our study suggests that both the location and orientation of the continent–ocean boundary play important roles in orogeny. |
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| language | English |
| last_indexed | 2024-04-14T03:12:08Z |
| publishDate | 2022-08-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Earth Science |
| spelling | doaj.art-fdb4d97f80ac452f8b6b7376ced6ccc12022-12-22T02:15:35ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632022-08-011010.3389/feart.2022.941040941040Exhumation history of the Hengchun Ridge and its implications for Taiwan orogenic processesPingchuan Tan0Pingchuan Tan1Weiwei Ding2Weiwei Ding3Weiwei Ding4Jiabiao Li5Jiabiao Li6Key Laboratory of Submarine Geosciences, Ministry of Natural Resources & Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, ChinaSouthern Marine Science and Engineering Guangdong Laboratory, Zhuhai, ChinaKey Laboratory of Submarine Geosciences, Ministry of Natural Resources & Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, ChinaSouthern Marine Science and Engineering Guangdong Laboratory, Zhuhai, ChinaSchool of Oceanography, Shanghai Jiao Tong University, Shanghai, ChinaKey Laboratory of Submarine Geosciences, Ministry of Natural Resources & Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, ChinaSchool of Oceanography, Shanghai Jiao Tong University, Shanghai, ChinaThe orogenic evolution of Taiwan is thought to have occurred with a steady and southward propagating trend since the Late Miocene. Recent studies suggest a two-stage collision for the Taiwan orogen and that the collision occurred simultaneously along the entirety of the island of Taiwan. To test this hypothesis, we evaluated 270 bathymetry profiles normal to the trench to constrain variations in the width, length, and crest of the Taiwan accretionary prism from the northern Central Ridge to the southern Hengchun Ridge. South of Taiwan Island, a gradual increase in the width and elevation of the accretionary prism of the Hengchun Ridge is noted. Assuming that the uplift of Hengchun Ridge is dominated by the accretion of hyper-stretched continental crust (HSCC), we estimated the uplift rate of the ridge (ca. 0.3 km/Ma) based on a linear regression between the HSCC and the observed depth of the prism crest. Using this uplift rate, we forward modeled the prism crest depth variations from 19.7°N to 23.5°N, and compared these values to observations. The model gives a good match to observations of the Hengchun Ridge, but significantly deeper depths to the north of Hengchun Peninsula. This suggests that the Taiwan orogeny had two stages: the first stage was dominated by structurally underplated HSCC, and the second is a combination of the arrival of the continental shelf and arc–continent collision. In addition to the widely accepted arc–continent collision, our study suggests that both the location and orientation of the continent–ocean boundary play important roles in orogeny.https://www.frontiersin.org/articles/10.3389/feart.2022.941040/fullhengchun ridgetaiwan orogenicmanila subductionhyper-stretched continental crustsouth China sea |
| spellingShingle | Pingchuan Tan Pingchuan Tan Weiwei Ding Weiwei Ding Weiwei Ding Jiabiao Li Jiabiao Li Exhumation history of the Hengchun Ridge and its implications for Taiwan orogenic processes Frontiers in Earth Science hengchun ridge taiwan orogenic manila subduction hyper-stretched continental crust south China sea |
| title | Exhumation history of the Hengchun Ridge and its implications for Taiwan orogenic processes |
| title_full | Exhumation history of the Hengchun Ridge and its implications for Taiwan orogenic processes |
| title_fullStr | Exhumation history of the Hengchun Ridge and its implications for Taiwan orogenic processes |
| title_full_unstemmed | Exhumation history of the Hengchun Ridge and its implications for Taiwan orogenic processes |
| title_short | Exhumation history of the Hengchun Ridge and its implications for Taiwan orogenic processes |
| title_sort | exhumation history of the hengchun ridge and its implications for taiwan orogenic processes |
| topic | hengchun ridge taiwan orogenic manila subduction hyper-stretched continental crust south China sea |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.941040/full |
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