scholarly journals Crustal and Upper Mantle Density Structure Beneath the Qinghai-Tibet Plateau and Its Surrounding Areas Derived from EGM2008 Geoid Anomalies

2016 ◽  
Author(s):  
Honglei Li ◽  
Jian Fang
Keyword(s):  
Upper Mantle ◽  
Initial Density ◽  
Density Model ◽  
Indian Plate ◽  
Tibet Plateau ◽  
Jinsha River ◽  
The Earth ◽  
Surrounding Areas ◽  
Geoid Anomalies ◽  
Qinghai Tibet Plateau

As the most active plateau on the Earth, the Qinghai-Tibet Plateau has a complex crust-mantle structure. Knowledge of the distribution of such a structure provides information for understanding the underlying geodynamic processes. We obtains a three-dimensional density model of crustal and upper mantle beneath Qinghai-Tibet plateau and its surrounding areas from the residual geoid anomalies using the Earth Gravitational Model (EGM) 2008. We estimate a refined density model by iterations, using an initial density contrast model. We confirm that the EGM2008 mission products can be used to constrain the crust-mantle density structures. Our major findings are: (1). At 300-400 km depth, high-D anomalies terminate around Jinsha River Suture (JRS) in the central TP, suggesting that the Indian plate has been reached over the Bangong Nujiang Suture (BNS) and almost reach to the JRS. (2). On the eastern TP, low-D anomalies at the depth of 0-300 km together with high-D anomalies at 400-670 km further verified the current eastward subduction of Indian plate. The ongoing subduction provides forces to the occurrences of frequent earthquakes and volcano. (3). At 600 km depth, low-D anomalies inside the TP illustrate the existence of hot weak material beneath there, contributing to the external material inward-thrusting.

scholarly journals A MODEL OF THE EVOLUTION OF THE LITHOSPHERE OF THE HIMALAYAN-TIBETAN OROGEN

2021 ◽  
pp. 89-107
Author(s):  
R.S. Alekseev, ◽  
◽  
Yu.L. Rebetsky ◽  
Keyword(s):  
Upper Mantle ◽  
Subduction Zones ◽  
Oceanic Lithosphere ◽  
Indian Plate ◽  
Tibet Plateau ◽  
Small Scale ◽  
Continental Lithosphere ◽  
Principal Stresses ◽  
Vertical Movements ◽  
Reference Parameters

The Himalayan-Tibetan orogen is one of the active orogens on Earth. The processes caused by the collision of two continents have attracted attention of many researchers, and over the past decades, a large amount of geological and geophysical data has accumulated, on which models of the evolution of the region are based. The paper presents a model of the evolution of the Tibet plateau and the adjacent mountain chains, which complies with the modern concepts of the structure of the crust. The reference parameters of this model are the data on the values of stresses and on the patterns of the spatial distribution of principal stresses obtained in our own tectonophysical studies in region, as well as in other intracontinental orogens and in subduction zones between lithospheric plates. The basic assumptions of the model are the factors of the long stage of the Indian plate underthrusting beneath the Eurasian continent, metamorphic processes in the submerged slab (oceanic lithosphere) and in the continental lithosphere above it, combination of absolute horizontal movements of the Eurasian and Indian plates, small-scale convection in the upper mantle and vertical movements of matter, both in the continental lithosphere itself and in the upper mantle.

Tradition, Habitat and Well-Being

2021 ◽  
pp. 1-22
Author(s):  
Zhi-nong Li ◽  
Shu-qing He
Keyword(s):  
Natural Environment ◽  
Good Life ◽  
Traditional Culture ◽  
Well Being ◽  
Cultural Relativism ◽  
Tibet Plateau ◽  
Jinsha River ◽  
Polygamous Marriage ◽  
River Region ◽  
Qinghai Tibet Plateau

Abstract The Tibetans who live among the valleys and mountains of the Jinsha River region, on the southeastern edge of the Qinghai–Tibet Plateau, still retain a considerable number of polygamous marriages. Through fieldwork in a Tibetan village, the authors discovered that polygamous marriage is a rational choice compatible with Tibetans’ traditional culture and natural environment, which can improve family well-being and lead to a good life. Our findings provide new fieldwork materials to support theories of cultural relativism advocated by the Boas school, which emphasises that the environment greatly affects culture, and Malinowski’s functionalism, which stresses that culture has been created to satisfy people’s practical needs.

scholarly journals Multiple Domestication Centers Revealed by the Geographical Distribution of Chinese Native Pigs

Animals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 709
Author(s):  
Yuan Cai ◽  
Jinqiang Quan ◽  
Caixia Gao ◽  
Qianyun Ge ◽  
Ting Jiao ◽  
...  
Keyword(s):  
River Basin ◽  
Yangtze River ◽  
Yunnan Province ◽  
Mekong River ◽  
Tibet Plateau ◽  
The Yangtze River ◽  
Mekong River Basin ◽  
Surrounding Areas ◽  
Qinghai Tibet Plateau ◽  
Native Pigs

Previous studies have shown that Southeast Asian pigs were independently domesticated from local wild boars. However, the domestication of Chinese native pigs remains a subject of debate. In the present study, phylogenetic analysis of Chinese native pigs was performed by screening for haplotypes inferred from a phylogenetic tree of pig mitochondrial DNA (mtDNA) sequences based on sequence-specific mutations. A total of 2466 domestic pigs formed 124 haplotypes and were assigned to four clades. Clade A comprised pigs distributed mainly in the Qinghai-Tibet Plateau and its surrounding areas; these pigs clustered into three groups. The pigs of clade B were mainly from the Mekong River Basin in Yunnan Province and had been exposed to genetic infiltration from European populations. Clade C comprised pigs mainly from the middle and lower reaches of the Yangtze River. The pigs of clade D were distributed mainly at the intersection of Yunnan, Sichuan, and Gansu provinces east of the Hengduan Mountains (YSGH). Compared with wild boar, at least three domestication centers and one expansion center of pigs in China were detected. Among the four centers detected, two were for Tibetan pigs and were in the Qinghai-Tibet Plateau and at the YSGH intersection, and the other two were in the Mekong River Basin in Yunnan Province and the middle and downstream regions of the Yangtze River.

scholarly journals River capture in the middle reaches of the palaeo-Yarlung Zangbo River

2020 ◽  
Vol 7 (4) ◽  
pp. 191753
Author(s):  
Yong Liu ◽  
Yunsheng Wang ◽  
Liangshuai Wei ◽  
Tong Shen ◽  
Qinfeng Shu ◽  
...  
Keyword(s):  
Flow Direction ◽  
Field Investigation ◽  
Indian Plate ◽  
Early Pleistocene ◽  
Tibet Plateau ◽  
Eurasian Plate ◽  
Accommodation Space ◽  
Yarlung Zangbo River ◽  
Elevation Model ◽  
Qinghai Tibet Plateau

There are 51 tributaries in the middle reaches of the Yarlung Zangbo River (YZR), and the confluences of 87% of the tributaries west of Jiacha Gorge are high-angle or perpendicular, reflecting the anomalous development of these tributaries. In this paper, field investigation and digital elevation model (DEM) methods were used to analyse the causes of this anomalous phenomenon, and it was found that there was a watershed in the area of the Jiacha Gorge. The palaeo-YZR west of the Jiacha Gorge flowed westward before the early Pleistocene into the Zada, Zhongba, Jilong and Gamba–Dingri palaeolakes, which featured a large amount of total accommodation space in the western Qinghai–Tibet Plateau; thus, this river was a continental river. With the intensification of the collision between the Indian plate and the Eurasian plate, the Qinghai–Tibet Plateau experienced rapid uplift and formed a landscape with high elevations in the west and lower elevations in the east, promoting the headward erosion of the eastward-flowing river. During the early Pleistocene, the river east of the Jiacha Gorge crossed the watershed and captured the palaeo-YZR, causing a reversal in the flow direction of the palaeo-YZR.

scholarly journals Geophysical survey and geodynamic study of crust and upper mantle in the Qinghai-Tibet Plateau

Episodes ◽  
2005 ◽  
Vol 28 (4) ◽  
pp. 263-273 ◽  
Author(s):  
Rui Gao ◽  
Zhanwu Lu ◽  
Qiusheng Li ◽  
Ye Guan ◽  
Jisheng Zhang ◽  
...  
Keyword(s):  
Upper Mantle ◽  
Geophysical Survey ◽  
Tibet Plateau ◽  
Crust And Upper Mantle ◽  
Qinghai Tibet Plateau
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