ABSTRACT The Upper Triassic black shales in the Sichuan Basin are formed in three stages and are predominantly situated at the forefront of the Longmenshan (LMS) thrust belt. These formations are a result of three rapid subsidence events in the foredeep and the development of an underfilled foreland basin, triggered by three intense thrust nappe movements of the LMS orogenic wedge during the Late Triassic. The lateral migration of black shales in the LMS foreland basin, from the northeast to the southwest, suggests that thrust nappe movements of the LMS orogenic wedge predominantly occurred in the northeastern region during the early Late Triassic and gradually shifted toward the southwestern region in the later Late Triassic. The ongoing convergence between the North China Craton and the Yangtze Block at this time likely influenced this migration process.

印支期泸州-开江古隆起位于四川盆地东部，由于其顶部广泛发育的岩溶不整合面是四川盆地重要的油气储集层而受到广泛关注，但是关于该古隆起的形成时间及成因机制长期存在很大分歧，既影响了对印支期上扬子地区构造演化的认识，也不利于四川盆地油气勘探工作.基于地震、钻井和野外露头资料，详细分析泸州-开江古隆起顶部不整合面，结合区域构造事件、全球海平面变化等资料，利用前陆盆地系统演化模型对泸州-开江古隆起的演化过程及动力机制进行系统分析.认为泸州-开江古隆起的形成及发展期在晚三叠世卡尼期-诺利期，消亡于瑞替期，该古隆起是晚三叠世龙门山前陆盆地系统的一个组成单元——前缘隆起，其演化过程主要受控于晚三叠世龙门山造山楔的构造负载和前陆盆地沉积物的沉积负载.晚三叠世，在华北板块和羌塘地体共同向扬子陆块西缘汇聚的构造背景下，扬子陆块西缘发生NW-SE向地壳缩短，导致龙门山造山楔向扬子克拉通的逆冲推覆作用，控制了泸州-开江古隆起的形成与演化.

基于沧东凹陷地震剖面和新生代残留盆地结构的详细分析,利用平衡剖面技术,结合沉积体系演变特征,系统研究了沧东凹陷的原型盆地构造演化过程.结果表明沧东凹陷新生代经历了坳陷期(孔三段-孔一下亚段沉积期)、断陷期(孔一上亚段-东营组沉积期)和坳陷期(馆陶组-平原组沉积期)3 个演化阶段.在断陷期,盆地演化主要受沧东和徐西两条边界断层的控制,盆地伸展作用具有逐渐减弱的特点,并且边界断层伸展作用具有自北西向南东迁移的特点.沧东凹陷新生代的构造演化受控于岩石圈上部简单剪切伸展和岩石圈下部纯剪切伸展的共同作用.

陆相气候敏感沉积物蕴含着丰富的古气候信息,是开展深时古气候研究的重要依据.我国学者利用陆相气候敏感沉积物对深时古气候演变开展了大量的研究工作,取得了丰硕的成果.介绍了常被应用于深时古气候研究的陆相气候敏感沉积物类型,并重点介绍了我国中东部白垩纪陆相气候敏感沉积物的研究进展.通过对我国中东部白垩纪陆相敏感沉积物分布特征的分析发现:在空间上,早白垩世的古气候环境可划分为半干旱气候区、干旱气候区与湿润气候区;晚白垩世的古气候环境可划分为干旱气候区、半干旱气候区与半湿润气候区.在时间上,与早白垩世相比,晚白垩世的干旱气候区范围有明显的扩张趋势,湿润气候区的范围逐渐向东北方向缩小.可见,白垩纪我国中东部气候环境整体上具有干旱化逐渐增强的趋势.最后针对陆相气候敏感沉积物研究存在的问题进行分析,并对其未来发展趋势进行了展望,以期为今后陆相气候敏感沉积物研究及其在深时古气候演变研究中的应用提供参考.

There exist divergent views about the Indosinian tectonic nature of basin and the evolution of basin-range pattern in the southwest margin of the Yangtze block. Detrital zircon U-Pb dating and detrital provenance analysis of sandstone samples from the Upper Triassic-Lower Jurassic of Xiangyun Section in the western Chuxiong basin were carried out. The results show that the detrital sources of the Upper Triassic Yunnanyi Formation and Luojiadashan Formation are mainly from the Middle-Lower Triassic and Permian in the Upper Yangtze region. The detrital sources of the Upper Triassic Baitutian Formation and the Lower Jurassic Fengjiahe Formation are mainly from the Songpan-Ganzi terrane and Kangdian ancient land. Combined with the sedimentary environment evolution and regional geological setting, it is considered that the orogeny is relatively weak during the earlier Late Triassic, and Chuxiong basin is an underfilled basin, whose clastic source supply is insufficient. From the later Late Triassic to Early Jurassic, the tectonic evolution of Chuxiong basin was controlled by the thrust nappe of Ailaoshan orogenic belt,but the sedimentary filling process of Chuxiong basin was mainly controlled by the rapid rise of Songpan-Ganzi orogenic belt.

基于地表露头、钻井资料,对四川盆地上三叠统黑色泥页岩的时空分布特征进行了详细的分析.在此基础上,对黑色泥页岩所记录的前陆盆地系统演化过程进行了研究.四川盆地上三叠统黑色泥页岩主要发育在龙门山冲断带的前缘地区,反映了晚三叠世龙门山造山楔的强烈逆冲推覆控制前陆盆地的沉积充填过程.晚三叠世,龙门山造山楔经历了三次较为强烈的造山作用,导致前渊地区快速沉降,形成欠补偿前陆盆地,为须一段、须三段和须五段三套黑色泥页岩的沉积提供了有利条件.四川盆地上三叠统须一段、须三段和须五段黑色泥页岩依次向南东迁移,表明晚三叠世龙门山造山楔具有显著地向南东推覆的特征.