Matches in SemOpenAlex for { <https://semopenalex.org/work/W2048996866> ?p ?o ?g. }
- W2048996866 abstract "We present the interpretation of a new set of closely spaced marine magnetic profiles that complements previous data in the northeastern and southwestern parts of the South China Sea (Nan Hai). This interpretation shows that seafloor spreading was asymmetric and confirms that it included at least one ridge jump. Discontinuities in the seafloor fabric, characterized by large differences in basement depth and roughness, appear to be related to variations in spreading rate. Between anomalies 11 and 7 (32 to 27 Ma), spreading at an intermediate, average full rate of ≈50 mm/yr created relatively smooth basement, now thickly blanketed by sediments. The ridge then jumped to the south and created rough basement, now much shallower and covered with thinner sediments than in the north. This episode lasted from anomaly 6b to anomaly 5c (27 to ≈16 Ma) and the average spreading rate was slower, ≈35 mm/yr. After 27 Ma, spreading appears to have developed first in the eastern part of the basin and to have propagated towards the southwest in two major steps, at the time of anomalies 6b-7, and at the time of anomaly 6. Each step correlates with a variation of the ridge orientation, from nearly E-W to NE-SW, and with a variation in the spreading rate. Spreading appears to have stopped synchronously along the ridge, at about 15.5 Ma. From computed fits of magnetic isochrons, we calculate 10 poles of finite rotation between the times of magnetic anomalies 11 and 5c. The poles permit reconstruction of the Oligo-Miocene movements of Southeast Asian blocks north and south of the South China Sea. Using such reconstructions, we test quantitatively a simple scenario for the opening of the sea in which seafloor spreading results from the extrusion of Indochina relative to South China, in response to the penetration of India into Asia. This alone yields between 500 and 600 km of left-lateral motion on the Red River-Ailao Shan shear zone, with crustal shortening in the San Jiang region and crustal extension in Tonkin. The offset derived from the fit of magnetic isochrons on the South China Sea floor is compatible with the offset of geological markers north and south of the Red River Zone. The first phases of extension of the continental margins of the basin are probably related to motion on the Wang Chao and Three Pagodas Faults, in addition to the Red River Fault. That Indochina rotated at least 12° relative to South China implies that large-scale “domino” models are inadequate to describe the Cenozoic tectonics of Southeast Asia. The cessation of spreading after 16 Ma appears to be roughly synchronous with the final increments of left-lateral shear and normal uplift in the Ailao Shan (18 Ma), as well as with incipient collisions between the Australian and the Eurasian plates. Hence no other causes than the activation of new fault zones within the India-Asia collision zone, north and east of the Red River Fault, and perhaps increased resistance to extrusion along the SE edge of Sundaland, appear to be required to terminate seafloor spreading in the largest marginal basin of the western Pacific and to change the sense of motion on the largest strike-slip fault of SE Asia." @default.
- W2048996866 created "2016-06-24" @default.
- W2048996866 creator A5028679440 @default.
- W2048996866 creator A5040619685 @default.
- W2048996866 creator A5079151229 @default.
- W2048996866 date "1993-04-01" @default.
- W2048996866 modified "2023-10-06" @default.
- W2048996866 title "Updated Interpretation of Magnetic Anomalies and Seafloor Spreading Stages in the South China Sea : Implications for the Tertiary Tectonics of Southeast Asia" @default.
- W2048996866 cites W1520762428 @default.
- W2048996866 cites W1552980575 @default.
- W2048996866 cites W1618640913 @default.
- W2048996866 cites W1982109421 @default.
- W2048996866 cites W1986649451 @default.
- W2048996866 cites W1989296527 @default.
- W2048996866 cites W1994332955 @default.
- W2048996866 cites W1997662167 @default.
- W2048996866 cites W1997667374 @default.
- W2048996866 cites W2001716744 @default.
- W2048996866 cites W2003235899 @default.
- W2048996866 cites W2006623458 @default.
- W2048996866 cites W2022760649 @default.
- W2048996866 cites W2026661705 @default.
- W2048996866 cites W2029331927 @default.
- W2048996866 cites W2039677320 @default.
- W2048996866 cites W2040925008 @default.
- W2048996866 cites W2041840839 @default.
- W2048996866 cites W2046419607 @default.
- W2048996866 cites W2050333075 @default.
- W2048996866 cites W2068108624 @default.
- W2048996866 cites W2071514511 @default.
- W2048996866 cites W2077334041 @default.
- W2048996866 cites W2077497629 @default.
- W2048996866 cites W2077788243 @default.
- W2048996866 cites W2083768781 @default.
- W2048996866 cites W2085669955 @default.
- W2048996866 cites W2085988310 @default.
- W2048996866 cites W2091031232 @default.
- W2048996866 cites W2091042545 @default.
- W2048996866 cites W2092717131 @default.
- W2048996866 cites W2106210403 @default.
- W2048996866 cites W2106502341 @default.
- W2048996866 cites W2117642521 @default.
- W2048996866 cites W2122914575 @default.
- W2048996866 cites W2129356058 @default.
- W2048996866 cites W2133597025 @default.
- W2048996866 cites W2142941539 @default.
- W2048996866 cites W2145705306 @default.
- W2048996866 cites W2146945733 @default.
- W2048996866 cites W2150217197 @default.
- W2048996866 cites W2153331827 @default.
- W2048996866 cites W2168011730 @default.
- W2048996866 cites W3201166240 @default.
- W2048996866 cites W4239993598 @default.
- W2048996866 hasPublicationYear "1993" @default.
- W2048996866 type Work @default.
- W2048996866 sameAs 2048996866 @default.
- W2048996866 citedByCount "97" @default.
- W2048996866 countsByYear W20489968662012 @default.
- W2048996866 countsByYear W20489968662013 @default.
- W2048996866 countsByYear W20489968662014 @default.
- W2048996866 countsByYear W20489968662015 @default.
- W2048996866 countsByYear W20489968662016 @default.
- W2048996866 countsByYear W20489968662017 @default.
- W2048996866 countsByYear W20489968662018 @default.
- W2048996866 countsByYear W20489968662019 @default.
- W2048996866 countsByYear W20489968662020 @default.
- W2048996866 countsByYear W20489968662021 @default.
- W2048996866 crossrefType "journal-article" @default.
- W2048996866 hasAuthorship W2048996866A5028679440 @default.
- W2048996866 hasAuthorship W2048996866A5040619685 @default.
- W2048996866 hasAuthorship W2048996866A5079151229 @default.
- W2048996866 hasBestOaLocation W20489968661 @default.
- W2048996866 hasConcept C111368507 @default.
- W2048996866 hasConcept C117485682 @default.
- W2048996866 hasConcept C127313418 @default.
- W2048996866 hasConcept C151730666 @default.
- W2048996866 hasConcept C165205528 @default.
- W2048996866 hasConcept C166957645 @default.
- W2048996866 hasConcept C191935318 @default.
- W2048996866 hasConcept C194482375 @default.
- W2048996866 hasConcept C195244886 @default.
- W2048996866 hasConcept C199360897 @default.
- W2048996866 hasConcept C205649164 @default.
- W2048996866 hasConcept C3019398675 @default.
- W2048996866 hasConcept C41008148 @default.
- W2048996866 hasConcept C527412718 @default.
- W2048996866 hasConcept C77928131 @default.
- W2048996866 hasConcept C95457728 @default.
- W2048996866 hasConceptScore W2048996866C111368507 @default.
- W2048996866 hasConceptScore W2048996866C117485682 @default.
- W2048996866 hasConceptScore W2048996866C127313418 @default.
- W2048996866 hasConceptScore W2048996866C151730666 @default.
- W2048996866 hasConceptScore W2048996866C165205528 @default.
- W2048996866 hasConceptScore W2048996866C166957645 @default.
- W2048996866 hasConceptScore W2048996866C191935318 @default.
- W2048996866 hasConceptScore W2048996866C194482375 @default.
- W2048996866 hasConceptScore W2048996866C195244886 @default.
- W2048996866 hasConceptScore W2048996866C199360897 @default.
- W2048996866 hasConceptScore W2048996866C205649164 @default.
- W2048996866 hasConceptScore W2048996866C3019398675 @default.