Abstract Orogenic gold deposits are generally thought to represent one perhaps protracted event. However, recent research on orogenic increasingly offers evidence for some forming through multiple and clearly discreet hydrothermal episodes. The giant Zaozigou Au-Sb deposit in the Triassic Cretaceous West Qinling Orogen, central China, includes both steeply dipping gently orebodies. two distinct mineralization styles provide a valuable setting investigating model by integrating structural...

The Western Qinling has been acknowledged to witness superimposed orogeny including north subduction of Paleotethys ocean and collision between North China South blocks; however, the precise timing constraints on transition tectonic regime are remaining enigmatic. Wenquan composite batholith comprising five phases mafic enclaves is an ideal example unlock this puzzle. host granitoids felsic, metaluminous peraluminous, high-K calc-alkaline shoshonitic suite with I-type affinity. enclaves,...

Abstract Epizonal orogenic Au‐Sb deposits are generally Phanerozoic in age, possibly as a consequence of erosion that can entirely remove older mineral rapidly uplifting setting. Quantifying post‐mineralization thermotectonic processes is essential for documenting the exhumation and preservation epizonal deposits, which turn critical constraining regional deformation. This study focuses on giant Zaozigou deposit, documents cooling rates using amphibole biotite Ar‐Ar, zircon U‐Th/He, apatite...

Multifractal analysis has been used in the exploration of soil grain size distributions (GSDs) environmental and agricultural research. However, multifractal studies regarding GSDs sediments braided delta-front are currently scarce. Open-source software designed for realization this technique not yet programmed. In paper, parameters 61 from Paleogene Enping Formation Huilu Low Uplift, Pearl River Mouth basin, calculated compared with traditional parameters. generalized dimension spectrum...

The Zaozigou Au-Sb deposit has been controversial in its genesis and remains one of the most difficult ore systems to fully understand West Qinling. mineralization shows a broad spatial association with Triassic dikes sills, which were previously thought be genetically related mineralization. Our U-Pb zircon dating this contribution indicates that ore-hosting porphyritic dacites formed at 246.1 ± 5.2 Ma 248.1 3.8 Ma. magmatic zircons yield εHf(t) values ranging from −12.5 −8.9, corresponding...

Within the framework of isospin-dependent quantum molecular dynamics model and statistical evaporation model, production neutron-deficient $^{245--250}\mathrm{Lr}$ isotopes is investigated. The fusion probability in reaction $^{44}\mathrm{Ca}+^{209}\mathrm{Bi}$ larger than that with $^{40}\mathrm{Ca}$ beam, especially at a lower incident energy smaller impact parameter, which attributed to dynamical barrier $^{44}\mathrm{Ca}+^{209}\mathrm{Bi}$. neck between projectile target grows faster...

Abstract Autogenic processes are widely found in various sedimentary systems and they play an important role the depositional evolution corresponding architecture. However, autogenic often affected by changing allogenic factors difficult to be identified analyzed from modern ancient records. Through flume tank experiment under constant boundary conditions, process, principles, architecture of a river-dominated delta was presented, model constructed. The controlled only process is obviously...

Abstract Large-scale conglomerate fan-delta aprons were typical deposits on the slope of Mahu Depression during Early Triassic. Without outcrops, it is difficult to study lithofacies only by examining limited cores from main oil-bearing interval Baikouquan Formation. Borehole electrical imaging log provides abundant high-resolution geologic information that obtainable real rocks previously. Referring lithology and sedimentary structure cores, a case fan-deltas in Lower Triassic Formation...

The use of either analytical or numerical models groundwater inflow into a tunnel, ignoring the excavation process, will result in inaccurate prediction. More researchers have begun to study prediction methods with temporal and spatial variables, accompaniment tunnel progress. hydrogeological parameters significantly affect prediction; thus, it is always worthy carry out an inversion analysis when rate observation available for excavated part tunnel. Based on transient model Trust Region...

Abstract The Mahu Depression is an important hydrocarbon-bearing foreland sag located at the northwestern margin of Junggar Basin, China. On northern slope depression, large coarse-grained proximal fan-delta depositional systems developed in Lower Triassic Baikouquan Formation (T 1 b). Some lithologic hydrocarbon reservoirs have been found conglomerates formation since recent years. However, rapid vertical and horizontal lithology variations make it difficult to divide base-level cycle using...

Based on detailed investigation of the modern sedimentation distributive fluvial system Shule River and data unmanned aerial vehicle (UAV) photography satellite remote sensing, sedimentary characteristics differences in arid areas are analyzed. By comparing changes slope, river morphology different sections from apex to toe, can be divided into three facies belts: "proximal", "middle" "distal". The proximal belt has largest slope strongest hydrodynamic condition, mainly appears as...

Abstract Based on large amounts of cores, open-hole conventional logs and mineral components analysis, abnormal natural gamma ray (GR) log showing high values in conglomerates low fine-grained sediments, are described explained Baikouquan Formation Xiazijie Fan-delta, Mahu Depression, Junggar Basin. After observing normalizing the GR correcting depth errors between both, individual grain-sized lithology extracted counted. When grain-size decreases, average different sized grains increase...

Abstract Logs in the petroleum boreholes indirectly records sedimentary cycles deep burial formation. In order to extract and understand periodicity cyclicity, it is necessary process data by digital signal analysis method. Taking gamma ray (GR) log as primary material, an identification approach of Milankovitch proposed this paper, which based on Maximum Entropy Spectral Analysis (MESA). The first stage chooses appropriate windows for calculating frequency spectral properties a short...

Abstract Gravel roundness is one of the simple but crucial parameters in particle shape, which related to transportation and deposition sediments. Based on digital images underground drilling cores, this study attempted characterize distinguish sedimentary microfacies by quantitatively test gravel trends fan delta Early Triassic Baikouquan Formation Mahu Depression, Juggar Basin China. By new proposed de-flat measurement, two major are recorded manifest rounding degree, value (Rd n )...