Weak Crust in Southeast Tibetan Plateau Revealed by Lg‐Wave Attenuation Tomography: Implications for Crustal Material Escape

2021 ◽  
Author(s):  
Xi He ◽  
Lian‐Feng Zhao ◽  
Xiao‐Bi Xie ◽  
Xiaobo Tian ◽  
Zhen‐Xing Yao
Keyword(s):  
Tibetan Plateau ◽  
Wave Attenuation ◽  
Crustal Material ◽  
Lg Wave ◽  
Southeast Tibetan Plateau

Gas geochemistry of the hot spring in the Litang fault zone, Southeast Tibetan Plateau

2017 ◽  
Vol 79 ◽  
pp. 17-26 ◽  
Author(s):  
Xiaocheng Zhou ◽  
Lei Liu ◽  
Zhi Chen ◽  
Yueju Cui ◽  
Jianguo Du
Keyword(s):  
Tibetan Plateau ◽  
Fault Zone ◽  
Hot Spring ◽  
Gas Geochemistry ◽  
Southeast Tibetan Plateau

scholarly journals Constraining the Water Cycle Model of an Important Karstic Catchment in Southeast Tibetan Plateau Using Isotopic Tracers (2H, 18O, 3H, 222Rn)

Water ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3306
Author(s):  
Dawei Liao ◽  
Zhonghe Pang ◽  
Weiyang Xiao ◽  
Yinlei Hao ◽  
Jie Du ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Water Cycle ◽  
Water Source ◽  
Natural World ◽  
World Heritage Site ◽  
Cycle Model ◽  
Isotopic Tracers ◽  
Geological Conditions ◽  
Local Water ◽  
Southeast Tibetan Plateau

Understanding the connectivity between surface water and groundwater is key to sound geo-hazard prevention and mitigation in a waterscape such as the Jiuzhaigou Natural World Heritage Site in the southeast Tibetan Plateau, China. In this study, we used environmental isotope tracers (2H, 18O 3H, and 222Rn) to constrain a water cycle model including confirming hydrological pathways, connectivity, and water source identification in the Jiuzhaigou catchments. We established the local meteoric water line (LMWL) based on the weekly precipitation isotope sampling of a precipitation station. We systematically collected water samples from various water bodies in the study area to design the local water cycle model. The regional water level and discharge changes at one month after the earthquake indicated that there was a hydraulic connection underground across the local water divide between the Rize (RZ) river in the west and Zechawa (ZCW) lake in the east by the δ18O and δ2H measurements. We employed an end-member mixing model to identify and quantify Jiuzhaigou runoff-generating sources and their contributions, and we found that the average contributions of precipitation and groundwater to the surface runoff in the catchments are about 30% and 70%, respectively. The two branches of the Shuzheng (SZ) trunk were recharged by 62 ± 19% from the ZCW lake and 38 ± 19% from the RZ river, which was consistent with the fractions calculated by the actual discharge volume. 222Rn mass balance analyses were employed to estimate the water exchange between groundwater and river, which further confirmed this estimate. 222Rn concentrations and 3H contents showed that the groundwater had a short residence time and it was moderate precipitation, thought the contribution of groundwater to the river was 70%, according to the different tracers. A three-dimensional conceptual model of the water cycle that integrated the regional hydrological and geological conditions was established for the catchments.

The role of pre-existing weak zones in the formation of the Himalaya and Tibetan plateau: 3-D thermomechanical modelling

2020 ◽  
Vol 221 (3) ◽  
pp. 1971-1983
Author(s):  
Lin Chen ◽  
Lijun Liu ◽  
Fabio A Capitanio ◽  
Taras V Gerya ◽  
Yang Li
Keyword(s):  
Tibetan Plateau ◽  
Early Stage ◽  
Crustal Thickening ◽  
The Tibetan Plateau ◽  
Crustal Material ◽  
Weak Zone ◽  
Orogenic Wedge ◽  
Orogenic Plateau ◽  
Weak Zones

SUMMARY The Tibetan crust is sliced by several east–west trending suture zones. The role of these suture zones in the evolution of the Himalayan range and Tibetan plateau remains unclear. Here we use 3-D thermomechanical simulations to investigate the role of pre-existing weak zones within the Asian Plate in the formation of orogen and plateau growth during continental collision. Our results show that partitioning of deformation along the convergent margin leads to scraping off of crustal material into an orogenic wedge above the margin and crustal thickening in the retro-continent, eventually forming a large orogenic plateau in front of the indenter. Pre-existing weak zone(s) within the retro-continent is reactivated at the early stage of convergence, and facilitates the northward propagation of strain and widening of the orogenic plateau. The northernmost weak zone sets the northern limit of the Tibetan plateau. Our models also show rheological weakening of the congested buoyant crust within the collisional zone drives wedge-type exhumation of deeply buried crust at the southern flank of the plateau, which may explain the formation of the Greater Himalayan Sequence.

Quick ice mass loss and abrupt retreat of the maritime glaciers in the Kangri Karpo Mountains, southeast Tibetan Plateau

2008 ◽  
Vol 53 (16) ◽  
pp. 2547-2551 ◽  
Author(s):  
Wei Yang ◽  
TanDong Yao ◽  
BaiQing Xu ◽  
GuangJian Wu ◽  
LingLong Ma ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Mass Loss ◽  
Southeast Tibetan Plateau

Sampling strategy and climatic implications of tree-ring stable isotopes on the southeast Tibetan Plateau

2011 ◽  
Vol 301 (1-2) ◽  
pp. 307-316 ◽  
Author(s):  
Chunming Shi ◽  
Valérie Masson-Delmotte ◽  
Camille Risi ◽  
Thomas Eglin ◽  
Michel Stievenard ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Tibetan Plateau ◽  
Tree Ring ◽  
Sampling Strategy ◽  
Southeast Tibetan Plateau

Runoff predictions in ungauged catchments in southeast Tibetan Plateau

2014 ◽  
Vol 511 ◽  
pp. 28-38 ◽  
Author(s):  
Fapeng Li ◽  
Yongqiang Zhang ◽  
Zongxue Xu ◽  
Changming Liu ◽  
Yanchun Zhou ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Ungauged Catchments ◽  
Southeast Tibetan Plateau

scholarly journals Glacier changes during the past century in the Gangrigabu mountains, southeast Qinghai–Xizang (Tibetan) Plateau, China

2006 ◽  
Vol 43 ◽  
pp. 187-193 ◽  
Author(s):  
Shiyin Liu ◽  
Donghui Shangguan ◽  
Yongjian Ding ◽  
Haidong Han ◽  
Changwei Xie ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Past Century ◽  
Climate Projections ◽  
Positive Mass ◽  
Plateau Region ◽  
The Past ◽  
Glacier Changes ◽  
Precipitation Increase ◽  
Southeast Tibetan Plateau ◽  
Area And Volume

AbstractThe present research focuses on glacier changes in the southeast of the Qinghai–Xizang (Tibetan) Plateau, where most of the temperate glaciers in China are located. Our results show that the 102 measured glaciers in the region have all retreated between 1915 and 1980, with total area and volume decreases of 47.9 km2 and 6.95 km3, respectively. The extrapolated mass loss of all glaciers in the Gangrigabu mountains amounted to 27 km3, 9.8% of the ice mass in 1915. Between 1980 and 2001, glaciers in the region have also experienced a general retreat; however, up to 40% of the glaciers were advancing. Our analysis demonstrates that precipitation in the studied area has increased substantially since the mid-1980s. This precipitation increase is likely to bring about a positive mass balance for glaciers in the region, so that the retreat of retreating glaciers might slow down or even turn into advance. Considering the sensitivity of the temperate glaciers in the region and the uncertainty in climate projections, more attention must be paid to glacier changes in the southeast Tibetan Plateau region.

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