ANOMALOUSLY SHALLOW INCLINATION IN MIDDLE-NORTHERN PART OF THE SOUTH CHINA BLOCK: PALAEOMAGNETIC STUDY OF LATE CRETACEOUS RED BEDS FROM YICHANG AREA

Show simple item record

dc.contributor.author Narumoto K.
dc.contributor.author Takemoto K.
dc.contributor.author Zaman H.
dc.contributor.author Otofuji Y.-I.
dc.contributor.author Yang Z.
dc.contributor.author Morinaga H.
dc.date.accessioned 2025-01-18T06:27:52Z
dc.date.available 2025-01-18T06:27:52Z
dc.date.issued 2006
dc.identifier https://www.elibrary.ru/item.asp?id=14428378
dc.identifier.citation Geophysical Journal International, 2006, 164, 2, 290-300
dc.identifier.issn 0956-540X
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/47488
dc.description.abstract We present new palaeomagnetic results from Late Cretaceous red beds of the Paomagang Formation collected at 42 sites in the Yichang area (30.7°N, 111.7°E), middle-northern part of the South China Block. A high unblocking temperature component around 680°C was isolated from 26 sites by stepwise thermal demagnetization. Fold tests are positive at the 95 per cent confidence limit for 14 and 11 sites of the Paomagang and Wangdian areas, respectively. Normal and reversed polarity sequence found in the Wangdian area passed a reversal test at the 95 per cent confidence limit. The tilt-corrected mean direction for Yichang area is D = 3.8°, I = 23.3° (α95 = 5.1°, N = 26), corresponding to a palaeopole at 71.5°N, 280.0°E with A95 = 4.3°. Comparison with the expected inclination from the 80 Ma Eurasian APWP pole indicates a inclination flattening of 26.3. ± 6.4°. Middle Cretaceous to Cenozoic NW-SE extension tectonics within the SCB contributes only 2.0° to the inclination flattening. While the massive samples of the Paomagang Formation show a moderate degree of anisotropy (1.017 < Pj < 1.086) and steeper inclination (I = 29.3°), the laminated samples,which formmore than 75 per cent of the studied samples, show a higher degree of anisotropy (1.052 < Pj < 1.227) and shallower inclination value (I = 22.7°).A good correlation between remanence inclination and facies types indicates that depositional processes produced the observed shallow inclination in the Yichang area. © 2006 The Authors Journal compilation © 2006 RAS.
dc.subject CRETACEOUS
dc.subject DEPOSITIONAL PROCESS
dc.subject INCLINATION SHALLOWING
dc.subject PALAEOMAGNETISM
dc.subject SCB
dc.subject TECTONICS
dc.title ANOMALOUSLY SHALLOW INCLINATION IN MIDDLE-NORTHERN PART OF THE SOUTH CHINA BLOCK: PALAEOMAGNETIC STUDY OF LATE CRETACEOUS RED BEDS FROM YICHANG AREA
dc.type Статья
dc.identifier.doi 10.1111/j.1365-246X.2005.02820.x
dc.subject.age Mesozoic::Cretaceous
dc.subject.age Мезозой::Меловая


Files in this item

This item appears in the following Collection(s)

  • ELibrary
    Метаданные публикаций с сайта https://www.elibrary.ru

Show simple item record