川东地区二叠系龙潭组属于过渡相—海相地层，页岩气勘探前景广阔。根据研究区页岩的矿物学、岩石学特征划分了岩相类型，利用地球化学数据重建了古沉积环境，并探讨了其有机质富集的控制因素，在此基础上建立岩相、有机质富集与沉积环境的耦合关系。研究结果表明：（1）川东龙潭组页岩主要发育硅质页岩、黏土质硅质混合页岩、黏土质钙质混合页岩和钙质硅质混合页岩等4种岩相，垂向上岩相分布可划分为早期相对富黏土阶段和晚期硅质含量相对较高阶段。（2）沉积环境分析表明，龙潭组沉积早期海平面低，主要处于氧化—次氧化环境，其U/Th平均为0.42,EFMo平均为6.66,V/（V+Ni）平均为0.77，古生产力较低，陆源输入大，硅质来源为陆源搬运；晚期海平面持续上升，主要处于还原环境，其U/Th平均为5.96,EFMo平均为148.01,V/（V+Ni）平均为0.79，古生产力高，陆源输入低，有大量生物成因硅富集。（3）龙潭组沉积时期有机质的富集具有明显的差异性，沉积早期受陆源输入强度和古生产力共同控制，大量陆源高等植物碎屑等被带入，造成其有机碳含量较高；沉积晚期仅受古生产力控制，陆源碎屑供给相对前期减弱，有机质多来源于海洋藻类植物。

位于青藏高原东南边界的小江断裂带系统构造运动强烈,是研究和检验高原物质运移模式及其构造响应的理想场所.研究基于横跨该断裂系统的宽频大地电磁和长周期大地电磁阵列观测数据,通过三维反演构建了岩石圈三维精细电性结构模型.模型显

The electrical conductivity of minerals under extreme conditions is governed by their variations in composition and structure. Constitution water, which is present in various polymorphic phases of olivine, can significantly enhance electrical conductivity under mantle pressure−temperature conditions, therefore playing a key role in proton transport. Despite this, the conductive mechanisms in hydrous olivine, particularly in hydrous ringwoodite, and the dynamic behavior of hydrogen at elevated temperatures, remain poorly understood. In this study, we investigated the proton conduction mechanisms in hydrous ringwoodite through first-principles calculations. Several hydrous models were considered, and ab initio molecular dynamics (AIMD) simulations were employed to simulate hydrous configurations at high temperatures. Calculations based on density functional perturbation theory (DFPT) and vibrational density of states (VDOS) analyses were conducted to probe the stability of hydrous structures, and investigate the dynamic behavior of internal hydrogen. Our results indicate that hydrogen trapped in Mg2+ and Fe3+ defects exhibits significantly higher mobility than hydrogen trapped in Si4+ defects. At elevated temperatures, we observed the ionization of hydrogen from cationic defects, leading to high and highly anisotropic proton conductivity along the [100] crystallographic direction. This thermal ionization-induced anisotropic conductivity is consistent with experimental observations of olivine single crystals. Finally, the conductivity of the 0.79 wt% hydrous ringwoodite structure was found to range from 10−0.3 to 100.4 S/m, the 1.19 wt% structure ranged from 100.4 to 100.9 S/m in the transition region, and the 1.62 wt% structure exhibited conductivity ranging from 100.7 to 101.2 S/m. These results are in excellent agreement with prior experimental data, providing further insight into the proton conduction mechanisms of hydrous olivine under extreme mantle conditions. ©2025 by Earth and Planetary Physics.

AlCl+ as a potential interstellar molecule has attracted significant attention, but gaps remain in our understanding of its thermodynamic properties and spectral line intensities. This study employed the icMRCI+Q method to compute potential energy curves for the 13 Λ-S states of AlCl+. Based on these curves, spectroscopic parameters and vibrational–rotational energy levels were determined. Subsequently, partition functions were calculated over a temperature range from 50 K to 10000 K, and the thermodynamic properties were derived. Using transition dipole moments, the UV spectra for transitions from the ground state (X 2Σ+) to the third excited state (22Π) were computed at 298.15 K. © 2024

The molecular potential energy function plays an important role in many fields. In this paper, the icMRCI + Q method was utilized to compute the potential energy and dipole moments for 22 Λ-S states and 51 Ω states of the TeI+ system. Two basis sets (AVQZ-PP and AWCVQZ-PP) were employed to compute the TeI+ system, with the results indicating that the AVQZ-PP basis set yielded more accurate results. Therefore, all calculations in this paper are based on this basis set. Furthermore, to ensure the accuracy of the results, a comparison was conducted on the spectral parameters of the ground state and two excited states of the molecular ion within the same main group. Given the significant impact of spin–orbit coupling, as indicated by the calculated SO matrix elements, our discussion will predominantly center on the avoidance of crossovers in the Ω states. Finally, the Franck-Condon factors, Einstein coefficients and radiative lifetime between these two states were calculated from the data of the transition between the X3Σ0+-↔11Σ0++ of the TeI+ molecule. © 2024 Elsevier Inc.

安宁河断裂带是川滇地块断裂活动体系中的一条近南北向断裂，其深部构造和地震活动性备受关注。为了评价该区域地震构造环境，研究安宁河断裂区域地幔柱作用“遗迹”，本文基于九龙-昭觉大地电磁测深数据，通过多种手段进行数据处理，建立研究区深部电性结构模型，并结合地质构造资料分析，得到以下结论：（1）研究区深部电性结构较复杂，地表及浅部地层以中高阻体为主，深浅厚度不均，中下地壳低阻层发育，安宁河断裂带深部上地幔存在相对上隆高阻体。（2）区内主要断裂带在电性结构上表现为明显的电性分界面/电性梯度带，断裂带附近区域的低阻特征可能与其内部填充的含盐水流体有关。（3）研究区震源主要分布在高阻体边缘、高低电阻率接触带以及低阻体内部，高阻体具有更强的岩石力学性质，高导体对应地壳中的软弱物质，在青藏高原不断东南向扩展的动力学背景下，这些动力通过软弱物质传递并集中在高阻体边缘使其发生脆性破裂，从而促使地震的发生。（4）攀西构造带轴部高阻体也是高速、高密度、高磁性异常体，该高阻体可能是峨眉山大火成岩省的喷发通道和巨厚的基性超基性岩的堆积通道。

印度大陆地幔岩石圈（ICML）在印-亚碰撞带之下的几何结构和变形对于了解陆-陆汇聚模式至关重要.本文利用重力数据和地震速度模型,估算了藏南地区上地幔剩余重力异常,然后通过三维重力反演构建了上地幔密度模型.结果显示,在喜马拉雅东部之下的上地幔中存在低密度异常,其东西长约300km,南北宽约100km;而在喜马拉雅西部之下则没有明显的密度异常.低密度异常的西界对应于亚东-谷露裂谷（地表经度为89°～90°E）,南界可能代表地幔缝合线,位于28°N附近（即雅鲁藏布江缝合带以南约130km处）.研究认为,与西部的ICML近水平俯冲不同,东部的ICML可能为陡俯冲,并可能伴随软流圈上涌.这种横向变化的几何结构表明, ICML可能在地幔缝合线与亚东-谷露裂谷在上地幔的交点处发生了重大撕裂. ICML撕裂以及在东部陡俯冲这一地质过程可能与藏南裂谷的发育以及喜马拉雅-冈底斯东部的中新世岩浆活动、成矿作用有关.

The geometry and deformation of the Indian continental mantle lithosphere (ICML) beneath the India-Eurasia collision zone are critical to understanding the accommodation of continent-continent convergence. In this paper, the distribution of residual gravity anomalies in the upper mantle of southern Tibet is estimated using the gravity data and seismic velocity models, and the heterogeneous density distribution of the upper-mantle is then recovered through three-dimensional gravity inversion. The results reveal a low-density anomaly (similar to 300 km W-E and similar to 100 km N-S) in the upper mantle under the eastern Himalaya, while there is no obvious density anomaly under the western Himalaya. The western boundary of the low-density anomaly coincides with the Yadong-Gulu Rift (YGR) on the surface (89 degrees-90 degrees E), and its southern boundary is located at similar to 28 degrees N, approximately 130 km southward from the Indus-Yarlung suture, probably representing the mantle suture at depth. This observation indicates that, in contrast to the western ICML which is probably underthrusting at a shallow angle, the eastern ICML be likely subducting steeply, accompanying asthenosphere upwelling. Such a laterally varying geometry suggests that a major tearing of the ICML may have taken place from the intersection of the mantle suture and the YGR in the upper mantle. The tearing and the steep subduction of the ICML might be associated with the magmatic and mineralization events in the eastern Himalaya-Gangdese and the formation of the YGR.

A set of organic-rich shales of the upper Permian Longtan Formation, which is widely developed in the northeastern part of the Sichuan Basin, is a key formation for the next step of exploration and development. At present, most studies on this set of formations have focused on the reservoir characteristics and reservoir formation mechanism of the shales, and basic studies on the palaeoenvironment and organic matter (OM) enrichment mechanism have not been fully carried out. In this paper, we recovered the sedimentary palaeoenvironment by mineralogical, elemental geochemical and organic geochemical analyses, and explored the enrichment mechanism of OM under the constraints of palaeoenvironmental evolution. The shales can be divided into two stages of sedimentary evolution: compared with the shales of the Lower Longtan Formation, the shales of the Upper Longtan Formation are relatively rich in quartz, poor in clay and carbonate minerals, and the OM type changes from type III to type II2. The depositional environment has undergone a change from sea level rise, from warm and wet climate to dry and cold climate, and from oxygen-poor condition restricted to open reduction environment; the land source input has decreased, the siliceous mineral content has increased, the biological productivity has improved, and the deposition rate has changed from high to low. A depositional model was established for the shales of the Longtan Formation, reflecting the differential reservoir formation pattern of organic matter. For the Lower Longtan Formation shales, the most important factors controlling OM content are terrestrial source input and deposition rate, followed by paleoclimate and paleo-oxygen conditions. For the Upper Longtan Formation shales, the most important controlling factor is paleoproductivity, followed by sedimentation rate. The depositional model constructed for the Upper and Lower Longtan Formation shales can reproduce the enrichment of organic matter and provide a basis for later exploration and development.image

To better understand the geothermal system of the Gonghe Basin, we deployed 471 magnetotelluric survey points with an average distance of 2 similar to 3 km, covering the eastern and southern areas of the Basin. We used ModEM inversion software to carry out 3D inversion of 431 survey points and established a 3D-electrical model at a depth of 50 km in the area. The resistivity model shows that the low resistivity in the shallow part of the basin is related to the Cenozoic loose sedimentary cover, while the resistivity values of the mountains around the basin and the magmatic rock uplift zone are higher. The electrical model also shows that the high-conductivity layer is widely distributed in the middle and lower crust (15 similar to 35 km) of the basin, and direction of the high-conductivity layer is consistent with that of NW-SE fault in the basin. These high-conductivity layers may be the principal reason for the high heat flow values in the Gonghe Basin. Our resistivity model also shows that there is an obvious discontinuity between high- and low-resistivity blocks at different depths in the middle and upper crust. These discontinuities are consistent with the faults observed on the surface, which are related to the strong topographic relief. Our electrical model shows that these faults in the middle and upper crust are connected with the high-conductivity layer as the channel of heat transfer to the shallow part. Finally, the heat energy is enriched in the Triassic granite to form dry hot rock (HDR). The 3D-magnetotelluric imaging results depict the 3D-distribution characteristics of the geothermal system in the eastern and southern parts of the Gonghe Basin.