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2025, 31(2).  
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Contents
Contents
2025, 31(2): 1-2.  
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Special Section Dedicated to the 30th Anniversary
Analysis of ore-controlling structures of the Shimensi tungsten deposit, Dahutang ore field, northwest Jiangxi Province
CHEN Bailin, GAO Yun
2025, 31(2): 169-196.   doi: 10.12090/j.issn.1006-6616.2024106
Abstract (54) HTML (7) PDF (10973KB)(7)
Characteristics of in-situ stresses and engineering stability analysis on the south section of the Bohai Strait Cross-Sea Corridor project
QIAO Erwei, MA Xiumin, GUO Hualin, Sun Yao, JIANG Jingjie
2025, 31(2): 197-210.   doi: 10.12090/j.issn.1006-6616.2023169
Abstract (147) HTML (18) PDF (3996KB)(5)
Earthquake-induced fissures and their formation mechanisms in the 2023 MS 6.2 Jishishan Earthquake
ZHANG Bo, WANG Aiguo, YAO Yunsheng, HE Xiaolong, YAO Saisai, ZHU Junwen, CAI Yimeng
2025, 31(2): 211-222.   doi: 10.12090/j.issn.1006-6616.2024114
Abstract (241) HTML (10) PDF (12241KB)(37)
Crustal Stress & Tectonic Stress Field
Static stress triggering of Morocco M 6.9 earthquake on 9 September 2023
WANG Runyan, WAN Yongkui, GUAN Zhaoxuan, HUANG Shaohua, GU Peiyuan, SONG Zeyao, ZHOU Mingyue
2025, 31(2): 223-234.   doi: 10.12090/j.issn.1006-6616.2024039
Abstract (66) HTML (7) PDF (3700KB)(5)
Energy Resources Geology
Study on the coupling between the hanging- and foot-wall beds and the gas content of deep coal seams in the Linxing area, eastern margin of the Ordos Basin
HUO Shaowei, FENG Xingqiang, WU Jian, ZHANG Shouren, ZHOU Lei, QIAN Zhuliang, CHAO Weiwei
2025, 31(2): 235-247.   doi: 10.12090/j.issn.1006-6616.2024124
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Factors controlling enrichment and accumulation of Devonian–Carboniferous shale gas in the Yaziluo rift trough in the Yunnan–Guizhou–Guangxi region
WANG Yufang, ZHAI Gangyi, SHI Wanzhong, WANG Jinzhu, ZHANG Jiazheng, KANG Haixia, ZHANG Yunxiao, ZHOU Hui, ZHANG Shuting
2025, 31(2): 248-266.   doi: 10.12090/j.issn.1006-6616.2024059
Abstract (25) HTML (5) PDF (9679KB)(2)
Geo-hazards & Engineering Geology
Formation mechanism and stability analysis of a landslide in altered ophiolite in the upper reaches of Jinsha River: A case study of the Duirongtong landslide
RAN Lina, ZHANG Yongshuang, REN Sanshao, LI Jinqiu
2025, 31(2): 267-277.   doi: 10.12090/j.issn.1006-6616.2024084
Abstract (65) HTML (15) PDF (3539KB)(6)
Quaternary Geology & Environment
The genesis and age of karst caves in Xinglong National Geopark, Hebei Province
ZHANG Haoyue, JIANG Qunou, ZHANG Xujiao, WANG Shan
2025, 31(2): 278-286.   doi: 10.12090/j.issn.1006-6616.2024136
Abstract (194) HTML (15) PDF (6623KB)(4)
Active Tectonics & Earthquake
InSAR coseismic deformation field and tectonic implications of the 2023 MS 5.5 Subei Earthquake, Gansu, China
XIONG Guohua, JI Lingyun, CHEN Yuxin, ZHU Liangyu, LIU Chuanjin, XU Jing, JIANG Fengyun, XU Guobin
2025, 31(2): 287-300.   doi: 10.12090/j.issn.1006-6616.2024127
Abstract (69) HTML (8) PDF (3126KB)(7)
Study on the activity of the Cuona-Woka Fault Zone, Qinghai-Tibet Plateau, and geological safety risks and prevention methods
QIANG Xingang, GUO Changbao, SUN Dongxia, HAN Jian’en, ZHANG Guangze, ZHANG Min, QIU Zhendong, HE Ping
2025, 31(2): 301-312.   doi: 10.12090/j.issn.1006-6616.2024093
Abstract (56) HTML (11) PDF (8031KB)(11)
Tectonic stability of the Nanpu sag: Evidence from temporal and spatial characteristics of seismic activity
ZHANG Yang, SHANG Lin, WANG Miao, WU Haitao, DUAN Bin
2025, 31(2): 313-324.   doi: 10.12090/j.issn.1006-6616.2024036
Abstract (144) HTML (17) PDF (9184KB)(5)
Fundamental Geology & Regional Geology
Monazite U-Pb age, geochemistry, and genesis of ore-bearing granites in the Zhukeng tungsten deposit, southern Jiangxi Province
GAO Yuan, WANG Ying, WANG Hai, XU Zhe, ZHANG Yong, ZHOU Yu, ZHANG Fangrong, SUN Chao, HE Bin, ZHANG Siyuan, ZHANG Fushen
2025, 31(2): 325-339.   doi: 10.12090/j.issn.1006-6616.2024083
Abstract (80) HTML (4) PDF (2901KB)(8)
Research Express
Identification of high-purity quartz raw materials from granites in the Xixia area, east Qinling orogenic belt
HE Chengguang, ZHAI Wenjian, WANG Yanhui, REN Jiande, ZHANG Shiqi, WANG Kun, HUANG Yehao
2025, 31(2): 340-344.   doi: 10.12090/j.issn.1006-6616.2025013
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Analysis of historical seismic parameters based on geological hazards from the Xiaonanhai earthquake
 doi: 10.12090/j.issn.1006-6616.2025001
[Abstract](0) [PDF 3736KB](0)
Abstract:
[Objective]   As the largest historical seismic event in Chongqing region, the Xiaonanhai Earthquake holds significant scientific value for deciphering seismogenic parameters to inform regional seismic hazard assessment and anti-seismic fortification standards. Addressing the critical challenge of observational data scarcity in historical earthquake research. [Methods]   A novel methodology for inverting seismic parameters through characteristic earthquake relics has been developed, systematically reconstructing the historical seismic parameters of the Xiaonanhai earthquake.. High-precision remote sensing interpretation and field investigations of seismically induced geo-hazards reveal that the landslide clusters triggered by the Xiaonanhai Earthquake exhibit a dominant near-N-S spatial distribution , consistent with the elliptical major axis direction of historically documented felt areas. [Results]   This spatial congruence suggests the NNW-striking Yangtoushan Fault as the seismogenic fault. Detailed remote sensing analyses of landslide orientations, sliding directions, and deposit distributions demonstrate, for the first time, coherent SE-directed motion features across multiple landslide masses, indicating a southeastward coseismic rupture propagation. Comparative analysis with the spatial correlation between geo-hazards and seismogenic structures observed in the Ludian Earthquake, coupled with seismotectonic mechanisms in southeastern Chongqing, further validates the rationality of the derived seismic parameters.  [Conclusion]   The study innovatively identifies a "karst-tectonic" composite mechanism: Under persistent NW-SE tectonic stress, bead-like karst caves developed along the fault zone or dominant joint directions form natural weakening zones, inducing stress concentrationand ultimately triggering left-lateral strike-slip motion with thrust components. This dual mechanism explains the unique seismic characteristics blending tectonic rupture and karst collapse. [Significance]  The proposed "geo-morphodynamic inversion" methodology advances historical earthquake parameter reconstruction and provides critical insights for seismic risk evaluation in karst terrains.
Study on pore structure characteristics and formation mechanism of high quality shale oil reservoirs in Chang 7 Member of Ansai Oilfield
 doi: 10.12090/j.issn.1006-6616.2025011
[Abstract](12) [PDF 2913KB](2)
Abstract:
The Yanchang Formation's seventh member in the AnSai Oilfield is a crucial development layer, with the genesis and pore structure of its reservoir playing a significant role in controlling reservoir quality, which in turn has a profound impact on shale oil production. The AnSai Oilfield faces challenges such as a lack of conventional resource potential and considerable difficulty in reserves replacement. Currently, the primary objective for reserve augmentation is the shale oil reservoir; therefore, understanding the pore structure and genesis of different reservoirs is of great importance for the exploration and development of the oilfield. This study focuses on the interbedded shale oil reservoir of the seventh member of the Yanchang Formation in the AnSai Oilfield, located in the Ordos Basin. Through the use of scanning electron microscopy, cast thin sections, low-temperature nitrogen adsorption, high-pressure mercury injection, and nuclear magnetic resonance experiments, we elucidate the impact of varying pore sizes on reservoir quality and reveal the genesis of different reservoirs from the perspectives of depositional environment and diagenesis.The results indicate that: (1) The main types of reservoir pores include feldspar dissolution pores, residual intergranular pores, intergranular dissolution pores, clay intercrystalline pores, and a small number of microfractures. Notably, feldspar dissolution pores primarily develop micron-sized pores, whereas clay intercrystalline pores are predominantly nanometer-sized. (2) The overall drainage pressure of the reservoir is relatively high, with lower mercury saturation and a predominant throat radius in the nanometer range. Pores with diameters under 500 μm tend to exhibit open, plate-like, and fissure-like geometries, with a small quantity of ink-bottle-shaped pores also developed. (3) Reservoir pore diameters are mainly below 300 μm, and as the physical properties of the samples improve, the proportion of larger pores within the reservoir gradually increases. (4) The genesis of high-quality reservoirs can be primarily categorized into two types: The first type, located to the northeast near the sediment source, experiences strong hydrodynamics and good particle sorting, facilitating the development of chlorite films, which protect the original intergranular pores between particles and preserve a substantial number of residual intergranular pores following compaction, thereby forming high-quality reservoirs. The second type, situated to the southwest away from the sediment source, is characterized by increased water depth and weakened hydrodynamics. This area, being close to hydrocarbon source rock development zones, is prone to organic acid dissolution from the source rock, leading to the development of numerous dissolved pores and the formation of a significant amount of high-quality reservoir.
Tectonic geomorphological evidence of Late Quaternary segmental activity of North Lajishan Fault
 doi: 10.12090/j.issn.1006-6616.2024125
[Abstract](30) [PDF 6294KB](6)
Abstract:
Lajishan-Jishishan is an important arc-shaped tectonic belt that extends to NE in the northeastern margin of the Tibetan Plateau, which is controlled by two extrusion thrust fault zones, the North Lajishan Fault and the South Lajishan Fault. Since the Late Cenozoic, the Lajishan area has strong tectonic activity, forming a significant basin-mountain coupling tectonic landform pattern, which is an ideal area to study the development and evolution of geomorphology and tectonic activities by using tectonic geomorphological methods. In this paper, using DEM data with a resolution of 30m, based on ArcGIS and MatLab platforms, plug-in tools and open-source code packages, the river steepness index (Ksn) values of 105 small and micro channels located above the fault at the outfall of the northern margin of Lajishan, and the HI values of 54 small and micro channels located in the bedrock area at the head of the river along the fault were extracted, and the area-elevation integral value (HI) interpolation value of the Lajishan-Jishishan area was calculated. According to the distribution of Ksn values, the uplift rate of the northern margin of the Lajishan showed an overall upward trend from west to east, but there was a local low value in the NE turning part of the fault on the northern margin of the Lajishan, which was speculated to be related to the weakening of the influence of the eastward thrust of the Dextel strike-slip fault in the Riyueshan from west to east, which also revealed the complexity, difference and segmentation of tectonic activities in this area. According to the results of Ksn value statistics, the Jishishan section has the fastest uplift rate and the strongest activity, which is likely to be an important reason for the occurrence of the 6.2 magnitude earthquake in Jishishan in 2023. Combined with the results of the geological survey of the route and the comprehensive interpretation of the oil exploration profile, the HI value shows that the Late Quaternary tectonic activity in the fault zone on the northern margin of the Lajishan has extended to the NE in addition to its own continuous activity, showing the characteristics of reverse fault and folding, resulting in more than ten moderate and strong earthquakes in the basin, and the migration characteristics and seismic activity of this tectonic activity are worthy of attention.
　　Kaywords: Lajishan;Jishishan;Channel Steepness Index;Hypsometric Integral;Tectonic-geomorphology
Deformation and geochronology of a ductile shear zone on the south side of Foping Dome in the South Qinling
 doi: 10.12090/j.issn.1006-6616.2025008
[Abstract](38) [PDF 6528KB](10)
Abstract:
The Foping area in the Qinling orogenic belt is characterized by the concentrated development of granulite-migmatite-gneiss domes, making it a crucial region for studying the rheological mechanisms of the middle to lower continental crust and the Mesozoic tectonic evolution of the Qinling Mountains. The Yangtianba-Shimudi ductile shear zone, located at the southern margin of the Foping dome, preserves abundant information on mid- to deep-level structural deformation during the orogenic process. Multi-scale structural analysis and kinematic vorticity analysis indicate that this shear zone is dominated by pure shear with a right-lateral ductile shear deformation. In the felsic mylonites, quartz primarily exhibits prism <a> and prism <c> slip systems, suggesting deformation occurred under amphibolite facies conditions at approximately 550-650 °C. The characteristics of the metamorphic mineral assemblages and the garnet-biotite-plagioclase thermobarometry results indicate a clockwise P-T path, with peak metamorphic conditions of 568-611 °C/5.2-5.3 kbar and 630-654 °C/7.1-7.9 kbar. The isothermal decompression stage M2 recorded conditions of 590-616 °C/3.5-4.5 kbar. Zircon U-Pb dating of the leucosomes in the migmatites within the shear zone yielded an age of 180.8±3.8 Ma, representing the lower limit of the ductile shear deformation. Integrated with regional geological data, the metamorphic and deformational evolution of the study area can be reconstructed as follows: Prior to ~210 Ma, the central segment of the South Qinling tectonic belt was dominated by collisional orogenesis, leading to crustal thickening and the development of progressive metamorphism (M1) in the Foping area. During 210-200 Ma, the Foping region transitioned into a tectonic regime shifting from collisional orogenesis to post-collisional extension. This transitional phase was characterized by a bidirectional stress regime combining horizontal shortening and vertical collapse, which triggered ductile shear deformation (D1) in the Yangtianba-Shimudi area and initiated the isothermal decompression metamorphic event (M2). By 180 Ma, the region had fully entered the post-collisional extensional stage, during which a decompression-induced partial melting event developed in the northern part of the study area. Subsequently, during the exhumation of the shear zone, the mylonitic foliation and metamorphic foliation (S1) were overprinted by late-stage folding and crenulation cleavage, resulting in foliation transposition (D2).
Genesis of the Gneissic Biotite Granite in Lanhe, Northern Guangdong: Constraints from Zircon U-Pb Geochronology, Hf Isotopes, and Geochemistry
 doi: 10.12090/j.issn.1006-6616.2024137
[Abstract](59) [PDF 2648KB](9)
Abstract:
[Objective] The Lanhe pluton in northern Guangdong is located at the southeastern margin of the Zhuguangshan pluton, primarily composed of gneissic biotite granite, whose petrogenesis has not yet been clearly defined. [Methods] In this study, LA-ICP-MS zircon U-Pb geochronology, rock geochemistry, and zircon Hf isotope analyses were conducted on the Lanhe gneissic biotite granite. [Results] U-Pb dating results indicate that the emplacement age of the Lanhe gneissic biotite granite is 427 ± 2 Ma, representing a product of the Caledonian magmatic activity. The geochemical characteristics show that the granite has SiO2 contents ranging from 71.53% to 75.41%, high total alkali contents (K2O + Na2O = 7.57%–8.23%), and A/CNK values (1.00–1.06). It is enriched in Rb, Th, U, and K, but depleted in Ba, Y, Nb, Ta, Sr, and Yb. The LREE/HREE ratios range from 9.49 to 28.15, with significant Eu negative anomalies (δEu = 0.21–0.76). The zircon εHf(t) values of the samples are all negative (-11.8 to -5.2), with corresponding tDM2 values of 1806–2129 Ma. [Conclusion]Based on the geochemical and isotopic characteristics, the Lanhe gneissic biotite granite is identified as a highly fractionated I-type granite, primarily formed by partial melting of crustal metasedimentary rocks, including metagraywacke and metapelite. It is likely a product of the multi-stage reworking of the Paleoproterozoic basement during the Neoproterozoic to Early Paleozoic. The comprehensive study suggests that the Lanhe gneissic biotite granite formed in a syn-collisional tectonic setting during the Early Paleozoic in South China. [Significance] Integrating with the Zhuguang magmatic system and regional geological data, the Lanhe pluton likely represents a product of the transition from compressional thickening to post-collisional extension during the Caledonian orogeny in South China. This transition may have been associated with intracontinental tectonic reorganization or external subduction-collision processes.
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Supervisor： China Geological Survey

Sponsor： Institute of Geomechanics, Chinese Academy of Geological Sciences; Geological Society of China (GSC)

Editor-in-Chief： Deng Jun

ISSN 1006-6616

CN 11-3672/P

Post Issue Number 82-124

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