Pegasus Basin, eastern New Zealand: A stratigraphic record of subsidence and subduction, ancient and modern
Pegasus Basin, eastern New Zealand: A stratigraphic record of subsidence and subduction, ancient and modern
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新西兰东部飞马盆地：古代和现代沉降和俯冲的地层记录
DOI：
10.1080/00288306.2015.1076862
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发表时间：
2015
影响因子：
2.2
通讯作者：
M. Isaac
中科院分区：
文献类型：
--
作者：
K. J. Bland;C. Uruski;M. Isaac
一个厚的地层结构（c。9000米）阿尔比-最近的沉积序列在飞马盆地内介绍，主要是基于新西兰政府的“PEG 09”二维地震勘探勘探的解释。 该盆地位于Hikurangi俯冲带的东部和外侧，主要是由于下伏太平洋板块在俯冲向滑脱断层过渡附近的新近纪下挠而形成的。盆地填充物几乎没有变形的新近纪收敛边缘构造，普遍变形相邻的东海岸盆地。划分了4个大型构造地层单位：（1）沉积并增生于冈瓦纳中生代增生楔内的变质沉积“基底”岩：（2）早白垩世希库兰吉高原的大火成岩省地壳;（3）非加积的“盖层”，包括与冈瓦纳加积楔最年轻部分年龄相当的岩石，（4）北岛东部俯冲作用恢复以来沉积的新近纪-现代地层。由地震数据所描述的前新第三纪地质学描述了冈瓦纳大陆边缘的中生代俯冲沿着，当活跃的俯冲增生在c. 110-105 Ma。飞马盆地的地质也提供了一个深入了解东海岸盆地的“基底”和“盖层”岩石之间备受争议的关系。这项研究也与评估该盆地的石油潜力有关，该盆地目前是在许可证下持有的。
The stratigraphic architecture of a thick (c. 9000 m) Albian–Recent sedimentary succession within the Pegasus Basin is presented here, based primarily on interpretation of the New Zealand Government's ‘PEG09’ 2D reconnaissance seismic survey. The basin lies immediately east and outboard of the Hikurangi subduction zone, and formed mainly because of Neogene downwarping of the underlying Pacific Plate near the transition from subduction to oblique-slip faulting. The basin fill is little deformed by the Neogene–Recent convergent margin tectonics that pervasively deform the adjacent East Coast Basin. Four large-scale tectonostratigraphic units are differentiated: (1) metasedimentary ‘basement’ rocks, deposited and accreted within the Gondwana Mesozoic accretionary wedge; (2) Early Cretaceous Large Igneous Province crust of the Hikurangi Plateau; (3) non-accreted ‘cover’ strata, incorporating rocks age-equivalent to the youngest parts of the Gondwana accretionary wedge, plus the overlying Late Cretaceous and Paleogene rocks deposited during thermal subsidence; and (4) Neogene–Recent strata deposited since the renewal of subduction beneath eastern North Island. The pre-Neogene geology illustrated by the seismic data describes the Mesozoic subduction along the Gondwana margin, ‘frozen’ at the time when active subduction accretion ceased at c. 110–105 Ma. The geology of Pegasus Basin also provides an insight into the much-debated relationship between ‘basement’ and ‘cover’ rocks in the East Coast Basin. This study is also relevant to the assessment of the petroleum potential of the basin, which is currently held under licence.
影响因子：
5
作者：
Hoernle, Kaj;Hauff, Folkmar;Davy, Bryan
通讯作者：
Davy, Bryan