1.Objective The Songliao Basin(SB)is situated on the eastern margin of Eurasia continent(Northeast Asia).During the Late Jurassic to Early Cretaceous,hundreds of rifting basins developed in this area,and the SB is a u...1.Objective The Songliao Basin(SB)is situated on the eastern margin of Eurasia continent(Northeast Asia).During the Late Jurassic to Early Cretaceous,hundreds of rifting basins developed in this area,and the SB is a unique case among them as it evolved into the largest rift basin.The rift basin filling of SB includes Huoshiling Formation,Shahezi Formation,and Yingcheng Formation in ascending order.The mega-rifting was controlled by the Mongol-Okhotsk Collisional Belt to the north and northwest and the Pacific Subduction Zone to the east(Wang PJ et al.,2016).As the first rifting succession,the Huoshiling Formation contains key information about the formation of the rifting basins and records the evolution of the Mongol-Okhotsk Collisional Belt and the Pacific Subduction Zone.However,the geological period of the Huoshiling Formation has not been well constrained for two main reasons.First,it is easily confused with the Yingcheng Formation,as both are dominated by volcanogenic-sedimentary successions.Second,there is lack of reliable dating samples from the uppermost part of the Huoshiling Formation due to its considerable burial depth.展开更多
火山活动长期以来被视为驱动恐龙演化及灭绝过程的重要地质因素之一,探究二者的时空关联关系,对于进一步理解恐龙的适应性演化、空间迁移模式乃至集群灭绝事件有着重要意义。当前对火山活动与恐龙演化的时空关联研究仍存在明显不足,尤...火山活动长期以来被视为驱动恐龙演化及灭绝过程的重要地质因素之一,探究二者的时空关联关系,对于进一步理解恐龙的适应性演化、空间迁移模式乃至集群灭绝事件有着重要意义。当前对火山活动与恐龙演化的时空关联研究仍存在明显不足,尤其是在地质大数据快速发展的背景下,缺乏基于多源数据库整合与定量空间分析的系统性研究,这在一定程度上制约了对二者协同演变规律的深入解析。本研究在数据驱动框架下,整合了古生物学数据库(The Paleobiology Database,PBDB)和深骨数据库(Deepbone Database,DBD)的恐龙化石记录以及大陆和海洋岩石的地球化学数据库(Geochemistry of Rocks of the Oceans and Continents,GEOROC)的火山岩数据。在此基础上,结合古地理重建、核密度估计及K-D树最近邻搜索等方法,系统解析了晚三叠世至晚白垩世恐龙演化与火山活动的时空关联特征。结果表明:在中生代整体温暖气候背景下,恐龙分布呈现以中纬度地区为分布峰值的纬度梯度格局;中大西洋大火成岩省喷发和卡鲁费拉尔大火成岩省喷发显著影响恐龙演化,在时间和空间上二者表现出高度相关性;空间距离分析进一步揭示,恐龙化石与火山岩的距离分布呈现递减趋势与双峰特征,第一峰值位于0~200 km,第二峰值位于约450 km处。该空间分布模式可能是火山喷发引发的短期环境灾害效应、火山物质输入带来的长期生态增益作用以及构造活动塑造的古地理格局共同作用的结果。展开更多
The accretion of the Panama-ChocóBlock to the South American Plate partially drove the geological setting of the northern Andes.This event occurred in different collisional stages that are recorded in Oligocene-m...The accretion of the Panama-ChocóBlock to the South American Plate partially drove the geological setting of the northern Andes.This event occurred in different collisional stages that are recorded in Oligocene-middle Miocene deformed rocks of the inter-Andean valley between the Western and Central Cordilleras of Colombia.However,uncertainty remains about the age of the latest accretionary phases of the Panama-ChocóBlock.Poorly studied late Miocene volcanic rocks within the northern inter-Andean valley may provide key information to constrain the temporality of that final collision.Here,we study the deformational features of the~12-6 Ma extrusive rocks of the Combia Volcanic Province located in the northwestern Andes(Colombia).We present anisotropy of magnetic susceptibility(AMS)data for pyroclastic and volcanic rocks within the AmagáBasin,an inter-Andean depression with Oligocene-middle Miocene sedimentary rocks that recorded NW-SE compression and NE-SW simple shear caused by the Panama-ChocóBlock collision.We identified that the magnetic fabrics of the extrusive rocks of the Combia Volcanic Province reveal flow directions that indicate the occurrence of ancient volcanoes in the central axis of the AmagáBasin.Some of these fabrics do not contain any deformational features,whereas others record the same structural regime as the Oligocene-middle Miocene sedimentary rocks.We infer that variations in the intensity of the deformation promoted late Miocene local fault reactivations that,in contrast to the Oligocene-middle Miocene deformational events,did not affect the entire AmagáBasin.Age differences among the studied sections can also explain the different deformational patterns identified in the basin.Both interpretations suggest that the most significant collisional events of the Panama-ChocóBlock occurred in the Oligocene-middle Miocene,whereas the formation of the Combia Volcanic Province may have either followed or coincided with the latest stages of the accretion.展开更多
基金supported by the National Natural Science Foundation of China(42102135,42072140,42202122 and 41790453)Science and Technology Research Program of Chongqing Municipal Education Commission(KJZD-M202101502,KJQN202201549 and KJQN202101535)+1 种基金Natural Science Foundation of Chongqing(CSTB2022NSCQ-JQX0031 and CSTB2022NSCQMSX1586)China Scholarship Council(202208505055)。
文摘1.Objective The Songliao Basin(SB)is situated on the eastern margin of Eurasia continent(Northeast Asia).During the Late Jurassic to Early Cretaceous,hundreds of rifting basins developed in this area,and the SB is a unique case among them as it evolved into the largest rift basin.The rift basin filling of SB includes Huoshiling Formation,Shahezi Formation,and Yingcheng Formation in ascending order.The mega-rifting was controlled by the Mongol-Okhotsk Collisional Belt to the north and northwest and the Pacific Subduction Zone to the east(Wang PJ et al.,2016).As the first rifting succession,the Huoshiling Formation contains key information about the formation of the rifting basins and records the evolution of the Mongol-Okhotsk Collisional Belt and the Pacific Subduction Zone.However,the geological period of the Huoshiling Formation has not been well constrained for two main reasons.First,it is easily confused with the Yingcheng Formation,as both are dominated by volcanogenic-sedimentary successions.Second,there is lack of reliable dating samples from the uppermost part of the Huoshiling Formation due to its considerable burial depth.
文摘火山活动长期以来被视为驱动恐龙演化及灭绝过程的重要地质因素之一,探究二者的时空关联关系,对于进一步理解恐龙的适应性演化、空间迁移模式乃至集群灭绝事件有着重要意义。当前对火山活动与恐龙演化的时空关联研究仍存在明显不足,尤其是在地质大数据快速发展的背景下,缺乏基于多源数据库整合与定量空间分析的系统性研究,这在一定程度上制约了对二者协同演变规律的深入解析。本研究在数据驱动框架下,整合了古生物学数据库(The Paleobiology Database,PBDB)和深骨数据库(Deepbone Database,DBD)的恐龙化石记录以及大陆和海洋岩石的地球化学数据库(Geochemistry of Rocks of the Oceans and Continents,GEOROC)的火山岩数据。在此基础上,结合古地理重建、核密度估计及K-D树最近邻搜索等方法,系统解析了晚三叠世至晚白垩世恐龙演化与火山活动的时空关联特征。结果表明:在中生代整体温暖气候背景下,恐龙分布呈现以中纬度地区为分布峰值的纬度梯度格局;中大西洋大火成岩省喷发和卡鲁费拉尔大火成岩省喷发显著影响恐龙演化,在时间和空间上二者表现出高度相关性;空间距离分析进一步揭示,恐龙化石与火山岩的距离分布呈现递减趋势与双峰特征,第一峰值位于0~200 km,第二峰值位于约450 km处。该空间分布模式可能是火山喷发引发的短期环境灾害效应、火山物质输入带来的长期生态增益作用以及构造活动塑造的古地理格局共同作用的结果。
基金supported financially by the National Natural Science Foundation of China (Grants W2433104 to V.A.P. and42225402 to J.L.)the China Postdoctoral Science Foundation(Grant 2024M753205 to V.A.P.)+4 种基金the Institute of Geology and Geophysics of the Chinese Academy of Sciences (International Fellowship for Postdoctoral Researchers, Grant 2025PD02 to V.A.P.)an association between ECOS-NORD (France)Colciencias/Icetex (Colombia)(Grant C12U01 to M.I.M.)a junior fellowship scheme of Colciencias (Colombia)(Grant 706-2015 to V.A.P.)supported the undergraduate final project of A.T
文摘The accretion of the Panama-ChocóBlock to the South American Plate partially drove the geological setting of the northern Andes.This event occurred in different collisional stages that are recorded in Oligocene-middle Miocene deformed rocks of the inter-Andean valley between the Western and Central Cordilleras of Colombia.However,uncertainty remains about the age of the latest accretionary phases of the Panama-ChocóBlock.Poorly studied late Miocene volcanic rocks within the northern inter-Andean valley may provide key information to constrain the temporality of that final collision.Here,we study the deformational features of the~12-6 Ma extrusive rocks of the Combia Volcanic Province located in the northwestern Andes(Colombia).We present anisotropy of magnetic susceptibility(AMS)data for pyroclastic and volcanic rocks within the AmagáBasin,an inter-Andean depression with Oligocene-middle Miocene sedimentary rocks that recorded NW-SE compression and NE-SW simple shear caused by the Panama-ChocóBlock collision.We identified that the magnetic fabrics of the extrusive rocks of the Combia Volcanic Province reveal flow directions that indicate the occurrence of ancient volcanoes in the central axis of the AmagáBasin.Some of these fabrics do not contain any deformational features,whereas others record the same structural regime as the Oligocene-middle Miocene sedimentary rocks.We infer that variations in the intensity of the deformation promoted late Miocene local fault reactivations that,in contrast to the Oligocene-middle Miocene deformational events,did not affect the entire AmagáBasin.Age differences among the studied sections can also explain the different deformational patterns identified in the basin.Both interpretations suggest that the most significant collisional events of the Panama-ChocóBlock occurred in the Oligocene-middle Miocene,whereas the formation of the Combia Volcanic Province may have either followed or coincided with the latest stages of the accretion.
