Position of the Lhasa block, South Tibet, during the late Cretaceous

Pozzi, Jean-Pierre; Westphal, M.; Zhou, Yao Xiu; Xing, Linxiao; Chen, Xian Yao

doi:10.1038/297319a0

Cited by 67 publications

(29 citation statements)

References 4 publications

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“…On the Asian side, Late Cretaceous data stem from studies of the Takena and Shexing Formations in southern Tibet (Supplementary Table S4)151921444546, with palaeolatitudes ranging from ~12°N to ~25°N12. Basically, all these studies more or less agree with Tan et al .…”

Section: Discussionsupporting

confidence: 69%

India-Asia collision was at 24°N and 50 Ma: palaeomagnetic proof from southernmost Asia

Meng

Wang

Zhao

et al. 2012

Sci Rep

136

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How and when India collided with Asia is crucial for global climate and continental dynamics. We present new palaeomagnetic data showing that the Xigaze forearc basin of southern Tibet was located at 24.2±5.9°N during 54–57 Ma, providing a direct constraint on the position of the southernmost margin of Asia at this crucial stage. Our study suggests 1) the age and locus of the initial India-Asia collision are at ~50 Ma and ~24°N, respectively; 2) Tibet resisted India's northward push during the first ~16 Ma of initial impact from the collision and experienced little latitudinal displacement; and 3) Sometime a little after 34 Ma, Greater India was consumed and thicker Indian Craton subsequently made contact with Asia, resulting in ~6° northward drift of Asia. Our model has implications for the process by which the high proto-Tibetan plateau formed and for the two slowdowns of India's convergence rate with Asia.

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Section: Discussionsupporting

confidence: 69%

India-Asia collision was at 24°N and 50 Ma: palaeomagnetic proof from southernmost Asia

Meng

Wang

Zhao

et al. 2012

Sci Rep

136

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“…The precollisional paleolatitude of the LT is a fundamental boundary condition for constraining the kinematics of the India‐Asia collision. The pioneering paleomagnetic studies from the LT began in the 1970s (e.g., Achache et al, ; Chen et al, ; Lin & Watts, ; Pozzi et al, ; Zhu et al, , ). These studies have been improved by several groups using larger data sets and additional rock‐magnetic analyses (Chen et al, ; Dupont‐Nivet et al, ; Huang et al, ; Huang, Dupont‐Nivet, Lippert, Hinsbergen, Dekkers, Guo, et al, ; Huang, Dupont‐Nivet, Lippert, Hinsbergen, Dekkers, Waldrip, et al, ; Li et al, ; Liebke et al, ; Ma et al, ; Tan et al, ; Yang, Ma, Zhang, et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies proposed that the timing of the India‐Asia collision ranged from ~70 Ma to ~20 Ma (e.g., Aitchison et al, ; Hu et al, ; van Hinsbergen et al, ; Yin & Harrison, ). Therefore, many paleomagnetic investigations of Cretaceous to Eocene age rocks from the LT have been performed to determine the position of the precollisional leading edge of Asia, as well as to better understand the collision process (when and where) (e.g., Hu et al, ; Huang, Dupont‐Nivet, Lippert, Hinsbergen, Dekkers, Guo, et al, ; Huang, Dupont‐Nivet, Lippert, Hinsbergen, Dekkers, Waldrip, et al, ; Li et al, ; Liebke et al, ; Lippert et al, ; Ma et al, ; Pozzi et al, ; Tan et al, ; Yang, Ma, Zhang, et al, ; Yi et al, ). Most of these studies focused on the upper Cretaceous Shexing Formation (Fm) and the Linzizong Group, which contain sedimentary and volcanic units.…”

Section: Introductionmentioning

confidence: 99%

Paleomagnetic and Geochronologic Results of Latest Cretaceous Lava Flows From the Lhasa Terrane and Their Tectonic Implications

Yang

Bian

et al. 2017

JGR Solid Earth

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To position the Asian southern margin before the India‐Asia collision, paleomagnetic and geochronologic studies were performed on the Dianzhong Formation lava flows from the Shiquanhe area of the westernmost Lhasa terrane (LT). Zircon U‐Pb analyses dated the lava flows to ~69.5 ± 2.5 Ma. The characteristic remanent magnetization directions contain antipodal polarities and pass fold tests, implying that they are primary magnetizations; this interpretation is supported by rock‐magnetic analyses and petrographic observations. Forty‐four site‐mean directions were divided into 17 statistically independent direction groups. The group‐mean direction after tilt correction is Ds = 43.3°, Is = 30.3°, k = 28.0, α95 = 6.9°. The corresponding paleopole at 47.8°N, 181.4°E (A95 = 6.4°) yields a paleolatitude of 16.6° ± 6.4°N for the Shiquanhe area of westernmost Tibet (32.34°N, 80.12°E). Consistent paleolatitudes for the southern margin of the LT calculated from the western and central part of the LT indicate that the leading edge of the LT was aligned relatively W‐E. When compared with the reference pole at 70 Ma for Eurasia, this new paleopole suggests that crustal shortening between the Shiquanhe area and stable Asia was 1,500 ± 800 km. This is supported by the crustal shortening (600–1,000 km) absorbed by Cenozoic thrust and fold belts within this area, indicating that the magnitude of crustal shortening within Asia north of the India‐Asia suture zone was similar in the central and western part of the plateau.

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“…To quantify continental shortening in the mid‐Asian region caused by Indian indentation since 55 Ma and to evaluate the relative importance of the processes involved in the India–Eurasia collision, paleomagnetic studies of Cretaceous rocks (mainly red beds) have been carried out in many tectonic blocks. 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].…”

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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Position of the Lhasa block, South Tibet, during the late Cretaceous

Cited by 67 publications

References 4 publications

India-Asia collision was at 24°N and 50 Ma: palaeomagnetic proof from southernmost Asia

India-Asia collision was at 24°N and 50 Ma: palaeomagnetic proof from southernmost Asia

Paleomagnetic and Geochronologic Results of Latest Cretaceous Lava Flows From the Lhasa Terrane 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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