中国东南部白垩纪伸展机制的起始和持续时间:来自陆相盆地生长层的制约

IF 1.9 3区 地球科学 Q1 GEOLOGY
Xinqi Yu, Jun Hu, Wei Li, Kun Liu, Ran Hao
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引用次数: 0

摘要

关于中国东南地块中生代晚期伸展构造的确切初始时间和持续时间,目前还没有达成共识。这项工作的重点是中国东南地块早白垩世红层的生长地层,以确定该地区中生代晚期的构造以及伸展构造的起始和持续时间。对几个陆相盆地的实地观察表明,从盆地边缘到内部(或中心),白垩纪红层的倾角从中等到平缓不等。单个床层内的可见厚度和估计厚度从上部到下部略微向下增加。这些特征表明,随着沉积盆地的扩张和加深,这些地层的沉积区经历了一个伸展过程。在不同盆地的矿床中,边界表面(分支)的旋转和倾斜正断层上盘的向下翘曲或下盘的后退导致了三种类型的伸展生长(或同构造)地层。与生长层有关的火山岩测年表明,早白垩世地层在中国东南地块约140至137Ma沉积时,沉积盆地扩大和加深。从区域上看,在约140 Ma以来古太平洋板块回滚的影响下,中国东南地块应力场导致岩石圈抬升和地表附近的拉分结构,导致半地堑盆地接受沉积。尽管伸展事件在120至105 Ma期间被一次短挤压事件打断,但随着海沟的向海退缩,伸展区域逐渐向东南扩大并恢复活力,直到白垩纪结束。中国东南地块的这次白垩纪伸展事件一定属于具有全球意义的世界性地质事件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Timing of the initiation and duration of the Cretaceous extensional regime in South-east China: Constraints from growth strata in terrigenous basins

Timing of the initiation and duration of the Cretaceous extensional regime in South-east China: Constraints from growth strata in terrigenous basins

There has been no consensus yet regarding the precise initial timing and duration of the late Mesozoic extensional tectonics in the South-eastern China Block. This work focusses on the growth strata of the Early Cretaceous red beds in the South-eastern China Block to determine the late Mesozoic tectonics and the precise timing of the initiation and duration of extensional tectonics in this area. Field observation of several terrigenous basins shows that the dip angles of the Cretaceous red beds have varied from moderate to gentle from basin edges to interiors (or centres). The visible and estimated thickness within a single bed increases slightly downwards from the upper to the lower part. These characteristics indicate that the sedimentary area of these beds has undergone an extensional process with expansion and deepening of the sedimentary basins. Rotation of the border surfaces (limbs) and downward warping of the hanging walls or retreat of the footwalls of listric normal faults causes three types of extensional growth (or syntectonic) strata in the deposits of different basins. Dating of the volcanic rocks related to the growth beds reveals that the sedimentary basins were enlarged and deepened when the Early Cretaceous strata were deposited in the South-eastern China Block from ca 140 to 137 Ma. Regionally, under the influence of Palaeo-Pacific plate rollback since ca 140 Ma, the South-eastern China Block stress field has led to lithospheric uplift and pull-apart structures near the surface, causing the half-graben basins to receive sedimentation. Although the extensional event was interrupted by a short compressional event during 120 to 105 Ma, with the oceanward retreat of the trench, the area of extension gradually enlarged and rejuvenated south-eastwards until the end of the Cretaceous. This Cretaceous extension event of the South-eastern China Block must belong to a worldwide geological event with global significance.

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来源期刊
CiteScore
4.10
自引率
16.70%
发文量
42
审稿时长
16 weeks
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