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Lateral, longitudinal, and temporal variation in trench-slope basin fill: examples from the Neogene Akitio sub-basin, Hikurangi Margin, New Zealand
New Zealand Journal of Geology and Geophysics ( IF 1.9 ) Pub Date : 2021-10-06 , DOI: 10.1080/00288306.2021.1977343
Adam D. McArthur 1 , Julien Bailleul 2 , Frank Chanier 3 , Alan Clare 4 , William D. McCaffrey 1
Affiliation  

ABSTRACT

The fill of trench-slope basins is complex, varying temporally, laterally, and longitudinally. New data from the Neogene stratigraphy of the Akitio Sub-basin, Wairarapa, are presented to investigate such fill variation. The preserved basin fill spans an area 70 km long by 10 km wide, representing deposits from a trench-slope basin. Integration of sedimentological, micropalaeoentological, and geological mapping data charts basin fill evolution. Over 15 km of strata were logged, defining 17 lithofacies associations, which were mapped across the basin; these are interpreted to represent both shallow and deep-water environments. The deep-water strata show a temporal evolution from ponded turbidite deposition, to a period of basin spill via conduits connecting to downstream basins, development of aggradational channel-levees, and finally unconfined submarine fan deposition. Shallow marine deposits mostly developed on the up-dip basin margin occur contemporaneously with basinal mass-transport deposits, and in association with the growth of basin bounding structural ridges. Comparison with the evolution of the offshore, actively filling Akitio Trough highlights controls on trench-slope basin fill: a first-order influence of external controls, e.g. tectonism to create the basin; a second-order progression from under- to overfilled; and third-order lateral variation reflecting autogenic process and the effects of local structures on seafloor gradients. These factors combine to vary sedimentation in trench-slope-basins spatially and temporally.



中文翻译:

沟槽斜坡盆地填充的横向、纵向和时间变化:来自新西兰 Hikurangi Margin 新近纪 Akitio 次盆地的示例

摘要

沟坡盆地的充填是复杂的,随时间、横向和纵向变化。提供了来自怀拉拉帕 Akitio 次盆地新近纪地层学的新数据,以研究这种填充变化。保存下来的盆地填充物跨越了一个长 70 公里、宽 10 公里的区域,代表了来自沟槽斜坡盆地的沉积物。沉积学、微古生物学和地质填图数据的整合图表盆地填充演化。记录了超过 15 公里的地层,定义了 17 个岩相组合,这些组合在整个盆地进行了绘制;这些被解释为代表浅水和深水环境。深水地层显示出从积水浊积沉积到通过连接下游盆地的管道溢出盆地的时间演变,加积河道堤坝的发展,最后是无侧限海底扇沉积。浅海相沉积主要发育在上倾盆地边缘,与盆地物质输送沉积同时发生,与盆地边界构造脊的生长有关。与近海、活跃充填的 Akitio Trough 的演变相比,突出了对沟槽斜坡盆地填充的控制:外部控制的一级影响,例如创建盆地的构造作用;从填充不足到填充过多的二阶进展;和反映自生过程的三阶横向变化和局部结构对海底梯度的影响。这些因素结合起来,在空间和时间上改变了沟坡盆地的沉积。浅海相沉积主要发育在上倾盆地边缘,与盆地物质输送沉积同时发生,与盆地边界构造脊的生长有关。与近海、活跃充填的 Akitio Trough 的演变相比,突出了对沟槽斜坡盆地填充的控制:外部控制的一级影响,例如创建盆地的构造作用;从填充不足到填充过多的二阶进展;和反映自生过程的三阶横向变化和局部结构对海底梯度的影响。这些因素结合起来,在空间和时间上改变了沟坡盆地的沉积。浅海相沉积主要发育在上倾盆地边缘,与盆地物质输送沉积同时发生,与盆地边界构造脊的生长有关。与近海、活跃充填的 Akitio Trough 的演变相比,突出了对沟槽斜坡盆地填充的控制:外部控制的一级影响,例如创建盆地的构造作用;从填充不足到填充过多的二阶进展;和反映自生过程的三阶横向变化和局部结构对海底梯度的影响。这些因素结合起来,在空间和时间上改变了沟坡盆地的沉积。积极填充 Akitio Trough 突出了对沟槽斜坡盆地填充的控制:外部控制的一级影响,例如构造作用以创建盆地;从填充不足到填充过多的二阶进展;和反映自生过程的三阶横向变化和局部结构对海底梯度的影响。这些因素结合起来,在空间和时间上改变了沟坡盆地的沉积。积极填充 Akitio Trough 突出了对沟槽斜坡盆地填充的控制:外部控制的一级影响,例如构造作用以创建盆地;从填充不足到填充过多的二阶进展;和反映自生过程的三阶横向变化和局部结构对海底梯度的影响。这些因素结合起来,在空间和时间上改变了沟坡盆地的沉积。

更新日期:2021-10-06
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