Temperature Measurements and Paleoclimate Analyses of Sedimentary Carbonates From the Cenozoic Qaidam Basin, Qinghai Province, China, Using Stable Isotopes and Clumped Isotope Thermometry

Jesmok, Greg; Upadhyay, Deepshikha; Xing, Jian; Herron-Rutland, Mahala; Tripati, Aradhna

doi:10.1130/abs/2018am-325077

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“…Paleosols sampled from the Lulehe Formation yield δ 18 O values that suggest cooling and >1 km uplift of the northern Qaidam Basin since Lulehe deposition (Song et al, 2018). However, these isotopic data should be interpreted with some caution because the Lulehe samples were probably buried deep enough to be significantly heated, and thus potential alteration is a concern (e.g., Jesmok et al, 2018;Song et al, 2018).…”

Section: Integrated Shortening Across the Qilian Shanmentioning

confidence: 99%

“…Isotopic and paleontological data suggest that northern Tibet has been similarly dry since the start of the Oligocene (e.g., Wang et al, 2003;Dupont-Nivet et al, 2007). The Eocene climate in northern Tibet is less well constrained, including whether it was a warmer and wetter time period (e.g., Dupont-Nivet et al, 2008;Jesmok et al, 2018). The across-strike Tibetan Plateau precipitation variations correlate with denudation and exhumation.…”

Section: Implications For the Evolution Of The Himalayan-tibetan Orogenmentioning

confidence: 99%

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Underthrusting and duplexing beneath the northern Tibetan Plateau and the evolution of the Himalayan-Tibetan orogen

Zuza

Wang

et al. 2018

Lithosphere

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The Cenozoic Qilian Shan thrust belt is the northern margin of the Tibetan Plateau, which developed in part due to progressive India-Asia convergence during Himalayan-Tibetan orogeny. Available geologic observations suggest that this thrust belt started deforming shortly after initial India-Asia collision at 60-55 Ma, and thus its kinematic development is intrinsically related to the construction and evolution of the Tibetan Plateau. Here, we present new field observations from a geologic traverse across the Qilian Shan to elucidate the style of deformation across the active thrust belt. In particular, we infer protracted out-of-sequence deformation here that is consistent with this thrust system remaining a stationary northern boundary to the Tibetan Plateau since the early Cenozoic. We present a lithosphere-scale model for this region that highlights the following: (1) coupled distributed crustal shortening and underthrusting of the North China craton beneath Tibet, which explains the spatial and temporal distribution of observed crustal shortening and thickness, (2) this underthrusting exploited the south-dipping early Paleozoic Qilian suture paleo-subduction mélange channel, and (3) development of a lower-crustal duplex at the lithospheric underthrusting ramp. This last inference can explain the relatively high elevation, low relief, and thickened crust of the central Qilian Shan, as well as the comparative aseismicity of the region, which experiences fewer earthquakes due to less upper-crustal faulting. Both the northern and southern margins of the Himalayan-Tibetan orogen appear to have developed similarly, with continental underthrusting and crustal-scale imbrication and duplexing, despite vastly different climatic and plate-velocity boundary conditions, which suggests that the orogen-scale architecture of the thrust belt is controlled by neither of these forcing mechanisms. Instead, strength anisotropies of the crust probably control the kinematics and style of deformation, including the development of northern Tibet, where thrust systems are concentrated along pre-Cenozoic suture zones.

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Section: Integrated Shortening Across the Qilian Shanmentioning

confidence: 99%

Section: Implications For the Evolution Of The Himalayan-tibetan Orogenmentioning

confidence: 99%

Underthrusting and duplexing beneath the northern Tibetan Plateau and the evolution of the Himalayan-Tibetan orogen

Zuza

Wang

et al. 2018

Lithosphere

View full text Add to dashboard Cite

show abstract

Temperature Measurements and Paleoclimate Analyses of Sedimentary Carbonates From the Cenozoic Qaidam Basin, Qinghai Province, China, Using Stable Isotopes and Clumped Isotope Thermometry

Cited by 1 publication

References 0 publications

Underthrusting and duplexing beneath the northern Tibetan Plateau and the evolution of the Himalayan-Tibetan orogen

Underthrusting and duplexing beneath the northern Tibetan Plateau and the evolution of the Himalayan-Tibetan orogen

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