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NUMERICAL MODELLING OF THE AUSTRALIA – ANTARCTICA CONJUGATE MARGINS USING THE GALO SYSTEM: PART 1. THE BREMER SUB‐BASIN, SW AUSTRALIA
Journal of Petroleum Geology ( IF 1.8 ) Pub Date : 2020-06-20 , DOI: 10.1111/jpg.12768
Y. I. Galushkin 1 , G. L. Leitchenkov 2 , E. P. Dubinin 1
Affiliation  

An analysis of variations in the tectonic subsidence of the Bremer sub‐basin (offshore SW Australia) since 160 Ma using the GALO numerical basin modelling programme has made it possible both to refine previous models and to estimate the intensity of stretching and thermal activation of the lithosphere. The new model explains the rapid subsidence of the sub‐basin and the deposition of the synrift Bremer 1 unit during the initial rift phase in the Late Jurassic (160 to 130 Ma). This phase of extension was accompanied by high heat flows, typical of the axial zones of continental rifts, and lithospheric stretching with a β‐factor of about 1.4. Between 130 and 43 Ma, the abnormally low depositional rate and the shallow water depths suggest moderate thermal activation of the mantle and the absence of extension‐driven subsidence. However during the Eocene (43 to 37 Ma), the modelling suggests that another phase of intense stretching of the sub‐basin lithosphere took place with β = 1.7, explaining both the subsidence and an abrupt increase in water depth from about 50–200 m to nearer 2000 m.

中文翻译:

使用GALO系统对澳大利亚-南极接合藻类进行数值模拟:第1部分。澳大利亚西南部的不来梅SUB-BASIN

使用GALO数值盆地建模程序对自160 Ma以来Bremer盆地(澳大利亚西南海岸)构造沉降的变化进行分析,使得既可以完善先前的模型,也可以估算其伸展和热活化强度。岩石圈。新模型解释了侏罗纪晚期(160至130 Ma)初始裂谷期子盆地的快速沉降和Bremer 1单元的沉积。伸展的这一阶段伴随着高热流,这是大陆裂谷的轴向区域的典型特征,岩石圈伸展的β因子约为1.4。在130至43 Ma之间,异常低的沉积速率和浅水深度表明地幔有中等程度的热活化作用,并且没有伸展驱动的沉降。
更新日期:2020-06-20
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