A paleomagnetic study of Mesozoic sediments from the Junggar and Turfan basins, northwestern China

Cogné, Jean-Pascal; Chen, Yan; Courtillot, Vincent; Rocher, Frédéric; Wang, Gongque; Bai, Meixiang; You, Hongzi

doi:10.1016/0012-821x(95)00083-o

Cited by 26 publications

(14 citation statements)

References 26 publications

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“…This is consistent with a tectonically active basin setting located close to possible source terranes in the Tian Shan and Bogda Shan, where paleo-slopes were probably steep and burial rates were sufficiently rapid to mitigate chemical weathering effects (Stallard 1985(Stallard , 1988Retallack 1990;Devaney and Ingersoll 1993;Ridgway and DeCelles 1993;Shao et al 1999a). Further, intermediate Mesozoic paleo-latitudes (e.g., 43Њ N; Enkin et al 1992;Cogné et al 1995) argue against intense weathering conditions typical of equatorial latitudes.…”

Section: Discussionmentioning

confidence: 99%

Integrated Provenance Analysis of a Complex Orogenic Terrane: Mesozoic Uplift of the Bogda Shan and Inception of the Turpan-Hami Basin, NW China

Greene

Carroll

Wartes

et al. 2005

Journal of Sedimentary Research

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We employ petrographic and advanced geochemical techniques to better document the evolution of the Turpan-Hami basin based on the unique geologic histories of the arc terranes that served as potential sources of Turpan-Hami deposits. First, a provenance study of Permian through Cretaceous sandstone of the Turpan-Hami basin reveals temporal and spatial changes in dominant source terranes that provided detritus to the basin. points to the initial uplift and unroofing of the largely andesitic Bogda Shan to the north, which first shed its sedimentary cover as it emerged to become the partition between the Turpan-Hami and southern Junggar basins.Second, geochronological, trace-element, and Sm-Nd isotopic variations among granitoids in the late Paleozoic Tian Shan orogenic belt provide a further test of Mesozoic uplift of the Bogda Shan. On the basis of previous models of crustal compositions throughout the South, Central, and North Tian Shan, Bogda Shan, and East and West Junggar terranes, we infer that isotopically enriched granitic cobbles (average ⑀Nd i ‫؍‬ Ϫ0.50, n ‫؍‬ 6) contained in Lower Triassic deposits in the north-central Turpan-Hami basin were derived from the continental crustal Central Tian Shan terrane, south of Turpan-Hami, and not from the more oceanic North Tian Shan, Bogda Shan, and East and West Junggar terranes, north of the Turpan-Hami basin. We therefore infer that the ancestral Bogda Shan had not been uplifted by the Early Triassic, and that prior to this time, a unified Junggar-Turpan-Hami basin existed during Late Permian deposition of extensive lacustrine deposits.

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Section: Discussionmentioning

confidence: 99%

Integrated Provenance Analysis of a Complex Orogenic Terrane: Mesozoic Uplift of the Bogda Shan and Inception of the Turpan-Hami Basin, NW China

Greene

Carroll

Wartes

et al. 2005

Journal of Sedimentary Research

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“…In receat years several Cretaceous paleomagaetic results [2,3,6] Paleomagnetic results indicate that the effect of India/Asia collision has diminished at the Haiyuan areas in the northeastern part of Tibetan plateau. In the other words, the Haiyuan area experienced no relative movement with respect to the NCB since the early Cretacous time.…”

Section: As Shown Inmentioning

confidence: 99%

Early Cretaceous Paleomagnetic Results From The Haiyuan Area And Their Tectonic Implications

Sun

Yang

et al. 2001

Chinese J of Geophysics

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A paleomagnetic study was carried out at 13 sites of lower Cretaceous red beds in the Haiyuan area, south west of Ninxia‐Hui autonomons region. A high‐temperature component was isolated using thermal demagnetization, which passed positive reversal test at 95% confidence level. The preliminary magnetic stratigraphic sequence from Liwaxia and Heshangpu formations, showing normal and reversal polarities changes, seems comparable with the lower Cretaceous magnetic time scale. We therefore suggest that the high‐temperature component probably represents the primary magnetization. The characteristic remanent magnetization direction after tilt correction is D = 12.7° , I = 50.2° , α95 = 6.3° . The corresponding paleopole lies at 78.2°N, 218.0°E (dp = 5.7° , dm = 8.4° ). Compared with the lower Cretaceous poles from the Ordos basin in west of North China Block, we conclude that the Haiyuan area has neither northward motion nor rotation with respect to the stable Ordos basin since lower Cretaceous time. The result indicates that along the southeastern section of the Haiyuan fault zone there is no large‐scale left‐slip movement, and that the effect of India and Eurasia collision has been diminished in the Haiyuan area.

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“…The results from the Tibetan Plateau (the Qiangtang and Lhasa blocks) suggest ∼2500 km northward transportation of these blocks in the Tertiary [ Pozzi et al , 1982; Achache et al , 1984; Lin and Watts , 1988; Chen et al , 1993]. The Cretaceous paleomagnetic data from the Tarim basin suggest ∼1000 km northward movement of the Tarim block [ Li et al , 1988; Chen et al , 1992; Cogne et al , 1995]. If this is true, the indentation of the Indian plate has been absorbed almost entirely by continental shortening within the Tibetan Plateau and the Kunlun, Tian Shan, and Altai mountain ranges.…”

Section: Introductionmentioning

confidence: 99%

Paleomagnetism and magnetic anisotropy of Cretaceous red beds from the Tarim basin, northwest China: Evidence for a rock magnetic cause of anomalously shallow paleomagnetic inclinations from central Asia

et al. 2003

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[1] Anomalously shallow paleomagnetic inclinations from Tarim basin red beds have suggested more than 1000 km of northward translation of the Tarim block since the Cretaceous. This is in conflict with geologic observations that indicate only a few hundred kilometers of crustal shortening north of the Tarim basin. To determine whether a rock magnetic effect could be the cause of the shallow inclinations, samples were collected from the Cretaceous Kapusaliang Group red beds. Both thermal and chemical demagnetization were employed to isolate the characteristic remanence (ChRM). The ChRMs pass the reversals test, as well as a local fold test. The anisotropy of magnetic susceptibility of the ChRM-bearing particles was isolated by chemical demagnetization and had an oblate fabric with minimum axes perpendicular to bedding and foliations of $1.035. A 10-20% remanent anisotropy was obtained by comparing the saturation isothermal remanent magnetization for subsamples drilled parallel and perpendicular to bedding planes. The correlation of AMS and remanent anisotropy parameters yielded a value for the individual particle magnetic susceptibility anisotropy between 1.05 and 1.62. A particle anisotropy of 1.0638 allowed the best fit between corrected data and theoretical correction curves. An inclination correction corrected the mean Kapusaliang direction from D = 16.3°, I = 29.0°, a 95 = 7.4°to D = 14.1°, I = 61.5°, a 95 = 6.4°. The inclination correction reduced the paleomagnetically predicted latitudinal offset from more than 1000 km to less than the mean direction's 95% confidence limits, suggesting that paleomagnetic inclination shallowing is the cause of low inclinations recorded by the red beds from the Tarim basin.

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A paleomagnetic study of Mesozoic sediments from the Junggar and Turfan basins, northwestern China

Cited by 26 publications

References 26 publications

Integrated Provenance Analysis of a Complex Orogenic Terrane: Mesozoic Uplift of the Bogda Shan and Inception of the Turpan-Hami Basin, NW China

Integrated Provenance Analysis of a Complex Orogenic Terrane: Mesozoic Uplift of the Bogda Shan and Inception of the Turpan-Hami Basin, NW China

Early Cretaceous Paleomagnetic Results From The Haiyuan Area And Their Tectonic Implications

Paleomagnetism and magnetic anisotropy of Cretaceous red beds from the Tarim basin, northwest China: Evidence for a rock magnetic cause of anomalously shallow paleomagnetic inclinations from central Asia

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