Reefal Platform Development, Devonian of the Canning Basin, Western Australia
Reefal Platform Development, Devonian of the Canning Basin, Western Australia
复制标题
西澳大利亚坎宁盆地泥盆纪珊瑚礁平台开发
DOI：
10.1306/948875dc-1704-11d7-8645000102c1865d
复制
发表时间：
1987
期刊：
影响因子：
3.5
通讯作者：
M. Middleton
中科院分区：
文献类型：
--
作者：
P. Playford;N. Hurley;C. Kerans;M. Middleton
从吉韦阶晚期到法门阶晚期，坎宁盆地泥盆纪礁灰岩台地的生长几乎是连续的。最早期（吉韦阶和早期弗拉斯阶）的台地是低起伏的浅滩;后来的弗拉斯阶和法门阶台地通常是高起伏的礁缘台地。直立的礁缘在弗拉斯期占主导地位，与广泛的溺水和尖峰礁的发展相关的后退间隔。一个短暂的出现发生在弗拉斯阶-法门阶的边界，和随后的法门阶平台推进盆地内的等效边缘斜坡和盆地相。晚法门期台地灭绝是由突然的淹没造成的。一个重要的初始控制平台的趋势是基底地形造成的中泥盆世或更老的断层。晚泥盆世期间持续的断层作用影响了一些台地的形态。同时代的地震活动也导致了海王星的断裂和地台边缘的崩塌。Canning盆地泥盆纪的假设海平面曲线被认为是全球地壳运动和区域地壳运动的综合结果;它与相应的欧美曲线非常相似。海平面上升（或下沉）的速率被认为在很大程度上控制了地台的演化。海岸和前进的平台与海平面的缓慢上升有关;直立的礁崖与适度快速的上升有关;后退，尖峰礁和溺水与非常快速的上升有关。礁后石灰岩的变浅向上周期是由几米的周期性突然上升造成的，随后是较长的静止。地震-地层建模与观测到的地震记录和钻井数据表明，从露头研究中推导出的泥盆纪台地演化模型也可以应用于地下。«少
Growth of Devonian reefal limestone platforms on the Canning basin was nearly continuous from the late Givetian to the late Famennian. The earliest (Givetian and early Frasnian) platforms were low-relief banks; later Frasnian and Famennian platforms were normally reef rimmed, with high relief. Upright reef margins predominated in the Frasnian, with intervals of backstepping associated with widespread drowning and the development of pinnacle reefs. A brief emergence occurred at the Frasnian-Famennian boundary, and the succeeding Famennian platforms advanced basinward over equivalent marginal slope and basin facies. Platform extinction in the late Famennian resulted from abrupt drowning. An important initial control on platform trends was basement topography resulting from Middle Devonian or older faulting. Continued faulting during the Late Devonian influenced the morphology of some platforms. Contemporary seismicity also led to neptunian fracturing and the collapse of platform margins. The hypothetical sea level curve for the Canning basin Devonian is believed to be a combined result of global eustatism and regional diastrophism; it shows gross resemblance to the equivalent Euramerican curve. Rates of sea level rise (or subsidence) are thought to have largely controlled platform evolution. Banks and advancing platforms were associated with slow rises in sea level; upright reef scarpsmore » with moderately rapid rises; and backstepping, pinnacle reefs, and drowning with very rapid rises. Shoaling-upward cycles in back-reef limestones resulted from periodic abrupt rises of a few meters, followed by longer stillstands. Seismic-stratigraphic modeling together with observed seismic records and well data suggest that the evolutionary model for the Devonian platforms deduced from outcrop studies can also be applied in the subsurface.« less