Three-dimensional electrical structure in the northwestern sector of the Sichuan-Yunnan diamond block
The Sichuan-Yunnan diamond block is a significant region of material flow from the Tibetan Plateau. However, its northwest electrical boundary remains undefined. Our study conducted a magnetotelluric profile from Chazha to Luomai across the geological boundary of the Sichuan-Yunnan block in its nort...
Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2025-01-01
|
| Series: | Frontiers in Earth Science |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2024.1527559/full |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832591733989310464 |
|---|---|
| author | Yunyun Zhang Yunyun Zhang Yunyun Zhang Xiaobin Chen Xiaobin Chen Peijie Wang Juntao Cai Juntao Cai Zhongyin Liu Zhongyin Liu Jiong Zhang Jiong Zhang Xingxing Huang Xingxing Huang |
| author_facet | Yunyun Zhang Yunyun Zhang Yunyun Zhang Xiaobin Chen Xiaobin Chen Peijie Wang Juntao Cai Juntao Cai Zhongyin Liu Zhongyin Liu Jiong Zhang Jiong Zhang Xingxing Huang Xingxing Huang |
| author_sort | Yunyun Zhang |
| collection | DOAJ |
| description | The Sichuan-Yunnan diamond block is a significant region of material flow from the Tibetan Plateau. However, its northwest electrical boundary remains undefined. Our study conducted a magnetotelluric profile from Chazha to Luomai across the geological boundary of the Sichuan-Yunnan block in its northwest sector. Using the nonlinear conjugate gradient three-dimensional inversion method, we obtained the deep electrical structure across the northern part of the block. Our findings reveal distinct segmental characteristics in the electrical structure along the profile. Marked by a high-resistivity zone along the Dedeng-Batang-Riyu fault, two high-conductivity layers exist in the upper-middle crust of the southwestern and central sections of the profile, at depths of 5–20 km and 10–30 km, respectively. Thus, our study suggests that the northwest boundary of the Sichuan-Yunnan diamond block, contrary to previous studies that considered it a transitional boundary, is located at the Dedeng-Batang-Riyu fault. Here, the boundary is a high-resistivity barrier, electrically isolating the Qiangtang block in the southwest from the Sichuan-Yunnan block in the northeast. The two significant high-conductivity zones in the upper-middle crust appear within the block’s interior, contrasting with previous assumptions of lower crustal flow. |
| format | Article |
| id | doaj-art-db8667190d1d4ccb83ed44a98d8a0a45 |
| institution | Kabale University |
| issn | 2296-6463 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj-art-db8667190d1d4ccb83ed44a98d8a0a452025-01-22T07:11:01ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632025-01-011210.3389/feart.2024.15275591527559Three-dimensional electrical structure in the northwestern sector of the Sichuan-Yunnan diamond blockYunyun Zhang0Yunyun Zhang1Yunyun Zhang2Xiaobin Chen3Xiaobin Chen4Peijie Wang5Juntao Cai6Juntao Cai7Zhongyin Liu8Zhongyin Liu9Jiong Zhang10Jiong Zhang11Xingxing Huang12Xingxing Huang13National Institute of Natural Hazards, Ministry of Emergency Management of China, Beijing, ChinaKey Laboratory of Compound and Chained Natural Hazards Dynamics, Ministry of Emergency Management of China, Beijing, ChinaSchool of Geophysics and Information Technology, China University of Geosciences, Beijing, ChinaNational Institute of Natural Hazards, Ministry of Emergency Management of China, Beijing, ChinaKey Laboratory of Compound and Chained Natural Hazards Dynamics, Ministry of Emergency Management of China, Beijing, ChinaDepartment of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, ChinaNational Institute of Natural Hazards, Ministry of Emergency Management of China, Beijing, ChinaKey Laboratory of Compound and Chained Natural Hazards Dynamics, Ministry of Emergency Management of China, Beijing, ChinaNational Institute of Natural Hazards, Ministry of Emergency Management of China, Beijing, ChinaKey Laboratory of Compound and Chained Natural Hazards Dynamics, Ministry of Emergency Management of China, Beijing, ChinaNational Institute of Natural Hazards, Ministry of Emergency Management of China, Beijing, ChinaKey Laboratory of Compound and Chained Natural Hazards Dynamics, Ministry of Emergency Management of China, Beijing, ChinaNational Institute of Natural Hazards, Ministry of Emergency Management of China, Beijing, ChinaKey Laboratory of Compound and Chained Natural Hazards Dynamics, Ministry of Emergency Management of China, Beijing, ChinaThe Sichuan-Yunnan diamond block is a significant region of material flow from the Tibetan Plateau. However, its northwest electrical boundary remains undefined. Our study conducted a magnetotelluric profile from Chazha to Luomai across the geological boundary of the Sichuan-Yunnan block in its northwest sector. Using the nonlinear conjugate gradient three-dimensional inversion method, we obtained the deep electrical structure across the northern part of the block. Our findings reveal distinct segmental characteristics in the electrical structure along the profile. Marked by a high-resistivity zone along the Dedeng-Batang-Riyu fault, two high-conductivity layers exist in the upper-middle crust of the southwestern and central sections of the profile, at depths of 5–20 km and 10–30 km, respectively. Thus, our study suggests that the northwest boundary of the Sichuan-Yunnan diamond block, contrary to previous studies that considered it a transitional boundary, is located at the Dedeng-Batang-Riyu fault. Here, the boundary is a high-resistivity barrier, electrically isolating the Qiangtang block in the southwest from the Sichuan-Yunnan block in the northeast. The two significant high-conductivity zones in the upper-middle crust appear within the block’s interior, contrasting with previous assumptions of lower crustal flow.https://www.frontiersin.org/articles/10.3389/feart.2024.1527559/fullmagnetotelluricSichuan-Yunnan diamond blockthree-dimensional inversionelectrical boundaryupper-middle crust |
| spellingShingle | Yunyun Zhang Yunyun Zhang Yunyun Zhang Xiaobin Chen Xiaobin Chen Peijie Wang Juntao Cai Juntao Cai Zhongyin Liu Zhongyin Liu Jiong Zhang Jiong Zhang Xingxing Huang Xingxing Huang Three-dimensional electrical structure in the northwestern sector of the Sichuan-Yunnan diamond block Frontiers in Earth Science magnetotelluric Sichuan-Yunnan diamond block three-dimensional inversion electrical boundary upper-middle crust |
| title | Three-dimensional electrical structure in the northwestern sector of the Sichuan-Yunnan diamond block |
| title_full | Three-dimensional electrical structure in the northwestern sector of the Sichuan-Yunnan diamond block |
| title_fullStr | Three-dimensional electrical structure in the northwestern sector of the Sichuan-Yunnan diamond block |
| title_full_unstemmed | Three-dimensional electrical structure in the northwestern sector of the Sichuan-Yunnan diamond block |
| title_short | Three-dimensional electrical structure in the northwestern sector of the Sichuan-Yunnan diamond block |
| title_sort | three dimensional electrical structure in the northwestern sector of the sichuan yunnan diamond block |
| topic | magnetotelluric Sichuan-Yunnan diamond block three-dimensional inversion electrical boundary upper-middle crust |
| url | https://www.frontiersin.org/articles/10.3389/feart.2024.1527559/full |
| work_keys_str_mv | AT yunyunzhang threedimensionalelectricalstructureinthenorthwesternsectorofthesichuanyunnandiamondblock AT yunyunzhang threedimensionalelectricalstructureinthenorthwesternsectorofthesichuanyunnandiamondblock AT yunyunzhang threedimensionalelectricalstructureinthenorthwesternsectorofthesichuanyunnandiamondblock AT xiaobinchen threedimensionalelectricalstructureinthenorthwesternsectorofthesichuanyunnandiamondblock AT xiaobinchen threedimensionalelectricalstructureinthenorthwesternsectorofthesichuanyunnandiamondblock AT peijiewang threedimensionalelectricalstructureinthenorthwesternsectorofthesichuanyunnandiamondblock AT juntaocai threedimensionalelectricalstructureinthenorthwesternsectorofthesichuanyunnandiamondblock AT juntaocai threedimensionalelectricalstructureinthenorthwesternsectorofthesichuanyunnandiamondblock AT zhongyinliu threedimensionalelectricalstructureinthenorthwesternsectorofthesichuanyunnandiamondblock AT zhongyinliu threedimensionalelectricalstructureinthenorthwesternsectorofthesichuanyunnandiamondblock AT jiongzhang threedimensionalelectricalstructureinthenorthwesternsectorofthesichuanyunnandiamondblock AT jiongzhang threedimensionalelectricalstructureinthenorthwesternsectorofthesichuanyunnandiamondblock AT xingxinghuang threedimensionalelectricalstructureinthenorthwesternsectorofthesichuanyunnandiamondblock AT xingxinghuang threedimensionalelectricalstructureinthenorthwesternsectorofthesichuanyunnandiamondblock |