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all geography including DSDP/ODP Sites and Legs
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Environmental conditions and mechanisms restricting microbial methanogenesis in the Miquan region of the southern Junggar Basin, NW China
3D stability analysis method for toppling failure on rock slopes
Indication of origin and distribution of coalbed gas from stable isotopes of gas and coproduced water in Fukang area of Junggar Basin, China
Prediction of multiple origin overpressure in deep fold-thrust belt: A case study of Kuqa subbasin, Tarim Basin, northwestern China
A study of the gas–water characteristics and their implications for the coalbed methane accumulation modes in the Southern Junggar Basin, China
Identification of Forearc Sediments in the Milin-Zedong Region and Their Constraints on Tectonomagmatic Evolution of the Gangdese Arc, Southern Tibet
Vine Copula‐Based Dependence Modeling of Multivariate Ground‐Motion Intensity Measures and the Impact on Probabilistic Seismic Slope Displacement Hazard Analysis
From extension to tectonic inversion: Mid-Cretaceous onset of Andean-type orogeny in the Lhasa block and early topographic growth of Tibet
Metamorphic fluid superimposition of the Changba–Lijiagou Pb–Zn deposit, West Qinling Orogen, central China
Abstract Several large to giant Pb–Zn deposits in the West Qinling Orogen in central China are argued to be of SEDEX (sedimentary exhalative) type or of epigenetic hydrothermal type. Additionally, the nature of the mineralizing fluids is poorly known. Our observations suggest that early stage primary marine sedimentary mineralization is characterized by laminated or disseminated fine-grained massive sulphide ores, and late stage metamorphic superimposition is represented by coarser equigranular annealed textures and the disruption of thinly laminated structures. Three coexisting types of fluid inclusions were recognized: H 2 O–NaCl (type I); H 2 O–NaCl–CH 4 –CO 2 (type II); and CH 4 –CO 2 (type III). The coexisting type I and II inclusions show similar homogenization temperature values but different salinities, indicating that fluid immiscibility occurred. Formation pressures calculated using type III inclusions are high (72.5–174.5 MPa). The lead isotopes of the sulphides and calcites show a narrow range. The primary sedimentary ore textures plus the similar lead isotopes between the ores and the wall rocks suggest a SEDEX origin, but the annealed recrystallization textures, the immiscible carbonic fluid inclusion assemblages and higher formation pressures suggest a strong late-stage metamorphic superimposition on the original SEDEX-type ores.
A study of hydrogeology and its effect on coalbed methane enrichment in the southern Junggar Basin, China
Foraminiferal Biostratigraphy and Palaeoenvironmental Analysis of the Mid-cretaceous Limestones in the Southern Tibetan Plateau
Prediction Equations for Ground‐Motion Significant Durations Using the NGA‐West2 Database
Eocene Neo-Tethyan slab breakoff constrained by 45 Ma oceanic island basalt–type magmatism in southern Tibet
Tethyan suturing in Southeast Asia: Zircon U-Pb and Hf-O isotopic constraints from Myanmar ophiolites
Design Ground Motion Library: An Interactive Tool for Selecting Earthquake Ground Motions
Region‐Specific Spatial Cross‐Correlation Model for Stochastic Simulation of Regionalized Ground‐Motion Time Histories
Spatial Cross‐Correlation Models for Vector Intensity Measures (PGA, I a , PGV, and SAs) Considering Regional Site Conditions
Intra‐Event Spatial Correlations for Cumulative Absolute Velocity, Arias Intensity, and Spectral Accelerations Based on Regional Site Conditions
The Altyn Tagh fault is one of the largest intracontinental strike-slip faults in the world, extending linearly ~1500 km along the northern edge of the Tibetan Plateau. All tectonic units bounded by the fault on the south, such as the Qaidam Basin and the Qilian Shan thrust belt, have experienced intensive shortening and uplift due to transfer motion from the Altyn Tagh. However, questions as to whether the tectonic units north of the Altyn Tagh fault have experienced associated deformation and whether the Altyn Tagh fault itself has experienced deformation remain unexplored. Our field study shows that the middle part of the Altyn Tagh fault separates the Altyn Tagh belt to the north from the Qaidam Basin to the south. The former was formed as a NE-SW–trending, lens-shaped block, consisting mainly of metamorphic rocks of Proterozoic age, and the latter is a basin that has been elongated in the E-W direction and filled with a thick succession of fluvial and lacustrine sediments of Cenozoic age. The Altyn Tagh fault has been considered to progressively propagate linearly to the northeast, accommodating the northeastward growth of the Tibetan Plateau by transfer of horizontal motion into intensive crustal shortening and uplift along the northeastern margin of the plateau. However, structural data from the main part of the fault show that this part of the fault was dominated by transtensional deformation in late Cenozoic time, which resulted in the subsidence of the large Xorkol Basin and deposition of a succession of fluvial and lacustrine sediments as old as Pliocene age. The foliation in the early Proterozoic metamorphic rocks within the Altyn Tagh belt generally strikes NE-SW, but the foliation along the main part of the belt is bent around the Xorkol Basin to strike NW-SE. Such deformation caused the increase in the width of the belt. These data led us to infer that the Altyn Tagh belt has experienced oroclinal bending along the main part of the Altyn Tagh fault around a vertical axis. From the difference in length along the northern and southern edges of the basin, as much as 60 km of late Cenozoic left-lateral motion along the main part of the Altyn Tagh fault was absorbed by the crustal bending and associated extension. The bending of the Altyn Tagh belt implies that the southwestern movement of the Altyn Tagh belt relative to the Qaidam Basin met with strong resistance, which is interpreted to have been generated by NE-SW compression along an E-W–trending segment of the Altyn Tagh fault to the southwest of the Xorkol Basin as part of a restraining bend.