Discovery of Mega-Sheath Folds Flooring the Liwan Subbasin (South China Sea): Implications for the Rheology of Hyperextended Crust
文献类型：期刊论文
| 作者 | Zhang, C.; Manatschal, G.; Pang, X.; Sun, Z.; Zheng, J.; Li, H.; Sun, L.; Zhang, J.; Zhao, Y. |
| 刊名 | GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
 |
| 出版日期 | 2020 |
| 卷号 | 21期号:7页码:e2020GC009023 |
| 关键词 | hyperextension ductile deformation crustal exhumation Liwan subbasin South China Sea |
| ISSN号 | 1525-2027 |
| DOI | 10.1029/2020GC009023 |
| 英文摘要 | Sheath folds recognized on kilometer scale are rare and only described in salt tectonics in seismic data. Here, we present mega-sheath folds spectacularly imaged in a 3-D seismic survey in the seismic basement flooring the hyperextended Liwan subbasin in the northern margin of the South China Sea. The sheath folds show eye structures delimited by anastomosing discontinuities. The axial planes of the sheath folds are subparallel to a rift-related, extensional detachment surface separating hyperextended seismic basement from the syn-rift sedimentary sequence. The sheath folds as well as the anastomosing discontinuities formed during hyperextension by ductile shearing of the forearc inherited and prestructured metasediments. The ductile shearing eventually resulted in the metasediments derived from midcrust unroofed at the footwall of an extension detachment fault. The discovery of mega-sheath folds and ductile deformation within the basement conflicts with the general assumption that hyperextended domains are in the brittle field. The new seismic observations show the importance of forearc inherited, prestructured anisotropic basement controlling the crustal rheology during hyperextension. |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/18535]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 作者单位 | 1.[Zhao, Y.] Minist Nat Resources, Inst Oceanog 2, Hangzhou, Peoples R China 2.[Zhang, C. 3.Sun, Z. 4.Sun, L.] South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou, Peoples R China 5.[Zhang, C. 6.Sun, Z. 7.Sun, L.] Chinese Acad Sci, Innovat Acad South China Sea Ecol & Environm Engn, Guangzhou, Peoples R China 8.[Manatschal, G.] Univ Strasbourg, IPGS, CNRS, Strasbourg, France 9.[Pang, X. 10.Zheng, J. |
| 推荐引用方式 GB/T 7714 | Zhang, C.,Manatschal, G.,Pang, X.,et al. Discovery of Mega-Sheath Folds Flooring the Liwan Subbasin (South China Sea): Implications for the Rheology of Hyperextended Crust[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2020,21(7):e2020GC009023. |
| APA | Zhang, C..,Manatschal, G..,Pang, X..,Sun, Z..,Zheng, J..,...&Zhao, Y..(2020).Discovery of Mega-Sheath Folds Flooring the Liwan Subbasin (South China Sea): Implications for the Rheology of Hyperextended Crust.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,21(7),e2020GC009023. |
| MLA | Zhang, C.,et al."Discovery of Mega-Sheath Folds Flooring the Liwan Subbasin (South China Sea): Implications for the Rheology of Hyperextended Crust".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 21.7(2020):e2020GC009023. |
入库方式： OAI收割
来源：南海海洋研究所
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