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| 1 | 大火成岩省及其在古大陆重建及裂解研究中的应用显示文摘大火成岩省是地质历史上与地球深部过程(如地幔柱)密切相关的极端地质事件,以相对较短时期内形成规模宏大的板内幔源基性岩浆活动为主要特征,对研究全球性大气—海洋环境的巨变与生物灭绝、大规模成矿及超大陆的重建和裂解均有重要意义。从潘吉亚超大陆的裂解过程可以看出,尽管不是所有的大火成岩省都与大陆裂解有关,但几乎每一次重要的裂解事件都伴有大火成岩省的出现,因此大火成岩省对于研究前潘吉亚超大陆,特别是对于缺少古生物等重建标志,古地磁数据偏少的前寒武纪超大陆重建及裂解研究有重要价值。近20多年来随着年代学技术的进步及研究工作的不断深入,大火成岩省在古大陆重建及裂解方面取得了一些重要进展,并发挥了越来越重要的作用。前寒武纪大火成岩省由于经历了多次裂解事件改造及后期抬升剥蚀或覆盖的影响,现今保留的是一些分散在不同大陆上的大火成岩省残片或碎片。用大火成岩省开展古大陆重建及裂解的目标就是通过不同陆块大火成岩省或大规模基性岩浆活动的年代学、岩石学及地球化学对比,结合其他证据,恢复大火成岩省形成时的时空分布特征,据此来确定这些陆块在超大陆中的相对或绝对位置。与其他前寒武纪大陆重建标志相似,大火成岩省也有一些局限性及不确定性,因此应用大火成岩省开展古大陆重建及裂解研究中要与前岩浆期沉积地层中的特殊事件层(如冰碛岩、火山灰、黑色页岩、不整合面、古生物等)对比、岩墙几何学产状、基性岩浆事件序列对比、古地磁、大型构造(如造山带)对比及深部地球物理等多学科方法相结合。 | 张拴宏 赵越 裴军令 王宏宇 胡国辉 张琪琪 蔡瑜杭 孔令昊 王森 王开 | 2022 | 地质论评2022，68，5： | 2 |
| 2 | Multistage tectono-stratigraphic evolution of the Canavese Intracontinental Suture Zone:New constraints on the tectonics of the Inner Western Alps显示文摘The Canavese Intracontinental Suture Zone(CISZ) within the Inner Western Alps represents the remnant of a long-lived minor subduction zone involving a narrow, thinned continental crust/oceanic lithosphere seaway between two continental domains of the Adria microplate(i.e., the Sesia Zone and the IvreaVerbano Zone). As opposed to many suture zones, the CISZ mostly escaped pervasive tectonic deformation and metamorphism, thus preserving the original stratigraphy and allowing the relationships between tectonics and sedimentation to be defined. Through detailed geological mapping(1:5000 scale),structural analysis, stratigraphic and petrographic observations, we document evidences for the late Paleozoic to late Cenozoic tectonic evolution of the CISZ, showing that it played a significant role in the context of the tectonic evolution of the Inner Western Alps region from the early to late Permian Pangea segmentation, to the Jurassic Tethyan rifting, and up to the subduction and collisional stages,forming the Western Alps. The site of localization/formation of the CISZ was not accidental but associated with the re-use of structures inherited from regional-scale wrench tectonics related to the segmentation of Pangea, and from the subsequent extensional tectonics related to the Mesozoic rifting, as documented by crosscutting relationships between stratigraphic unconformities and tectonic features. Our findings document that evidences derived from stratigraphy, facies indicators, and relationships between tectonics and sedimentation in the shallow crustal portions of suture zones, such in the CISZ, are important to better constrain the tectonic history of those metamorphic orogenic belts around the world in which evolutionary details are commonly complicated by high-strain deformation and metamorphic transformations. | Gianni Balestro Andrea Festa Sara De Caroli Edoardo Barbero Alessandro Borghi Franco Gianotti | 2022 | Geoscience Frontiers2022，13，6： | 0 |
| 3 | The western Durkan Complex(Makran Accretionary Prism,SE Iran):A Late Cretaceous tectonically disrupted seamounts chain and its role in controlling deformation style显示文摘The Durkan Complex is a key tectonic element of the Makran accretionary prism(SE Iran)and it has been interpreted as representing a continental margin succession.We present here a multidisciplinary study of the western Durkan Complex,which is based on new geological,stratigraphic,biostratigraphic data,as well as geochemical data of the volcanic and meta-volcanic rocks forming this complex.Our data show that this complex consists of distinct tectonic slices showing both non-metamorphic and very low-grade metamorphic deformed successions.Stratigraphic and biostratigraphic data allow us to recognize three types of successions.Type-Ⅰis composed by a Coniacian-early Campanian pelagic succession with intercalation of pillow lavas and minor volcaniclastic rocks.Type-Ⅱsuccession includes a volcanic sequence passing to a volcano-sedimentary sequence with Cenomanian pelagic limestones,followed by a hemipelagic sequence.This succession is characterized by abundant mass-transport deposits.Type-Ⅲsuccession includes volcanic and volcano-sedimentary sequences,which are stratigraphically covered by a Cenomanian platform succession.The latter is locally followed by a hemipelagic sequence.The volcanic rocks in the different successions show alkaline geochemical affinity,suggesting an origin from an oceanic within-plate setting.Our new results indicate that the western Durkan Complex represents fragments of seamounts tectonically incorporated in the Makran accretionary wedge during the latest Late Cretaceous-Paleocene.We propose that incorporation of seamounts in the frontal prism caused a shortening of the whole convergent margin and possibly contributed to controlling the deformation style in the Makran Accretionary Wedge during Late Cretaceous-Paleocene times. | Edoardo Barbero Luca Pandolfi Morteza Delavari Asghar Dolati Emilio Saccani Rita Catanzariti Valeria Luciani Marco Chiari Michele Marroni | 2021 | Geoscience Frontiers2021，12，3： | 0 |
| 4 | Seismotectonics and consequences of the 1930s large earthquakes in eastern Mazandaran,north of Iran显示文摘Early in the 1930 s,two relatively large earthquakes(Kosout,magnitude 6.8,and Talarrud,magnitude 5.8)shook the eastern Mazandaran,northern Iran.Despite the historical and instrumental seismic activity of the eastern region of Mazandaran,little is known about the status of seismotectonics and consequences of these earthquakes.This paper presents a compilation of available data from early reports of these earthquakes with new structural,geomorphic and local data on the effects of this earthquake,especially co-seismic landslides and liquefaction,to assess the seismotectonics and probable causative faults of the earthquakes.It is proposed that the close times of occurrence of two earthquakes might be due to local loading or triggering effect of the first earthquake on the second one.Like many other instrumental earthquakes in the Central Alborz,it is difficult to find the exact causative faults of important earthquakes,however the Qadikola,Chachkam or North Alborz Fault have the potential of producing Kosout earthquake and the Lalehband fault is more promising for Talarrud earthquake.Additionally,the structural complexity of the area is also discussed in the form of a hybrid tectonic model.In this model,the boundary zone of thick-skinned and active thin-skinned domains has more structural complexity than outer portions.Konim-Badeleh Shahvar pop-up structure is bounded by major faults with thick-skinned deformation style.The role of older inherited fault structures and their interaction with low-slope Neogene thrusts driven from north to south by crustal tectonics and deformation is discussed.Co-seismic landslides and rock falls have great potential to be investigated in the Alborz Range for identification of prehistoric earthquakes. | Mohsen EHTESHAMI-MOINABADI Ehsan ABBASI Ali SAKET | 2022 | Journal of Mountain Science2022，19，2： | 0 |
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