The response of deltaic systems to climatic and hydrological changes in Daihai Lake rift basin, Inner Mongolia, northern China
The response of deltaic systems to climatic and hydrological changes in Daihai Lake rift basin, Inner Mongolia, northern China
复制标题
内蒙古岱海裂谷盆地三角洲系统对气候水文变化的响应
DOI：
10.3724/sp.j.1261.2013.00016
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
于兴河
中科院分区：
文献类型：
--
作者：
于兴河
摘要 湖泊裂谷盆地周围普遍存在三角洲系统。其外围几何形状、进积构造和沉积层序受构造环境和气候变化的控制。三角洲外围几何形状受沉积梯度的强烈影响，在陡坡上形成扇形三角洲，在缓坡上发育瓣形三角洲。由于气候变化，河流的泄流量会发生快速变化，三角洲近岸地区显示出相当大的相变性。年降雨量的增加表明流入三角洲的河流是连续的，并导致三角洲前部普遍存在分流河口坝，因为下坡水流大于沿坡水流。相反，当年降雨量减少、蒸发量增加时，河流只能短暂地滋养三角洲。如果沿坡水流处于主导位置，则远端棒体沉积。三角洲的进积结构和沉积层序受斜坡坡度的控制。在平缓的沉积斜坡上，卵石前积层以细沉积物和小规模沉积结构为主，反之亦然。
Abstract Delta systems are ubiquitous around lacustrine rift basins. Its peripheral geometry, progradation structures and sedimentary successions were controlled by both tectonic settings and climatic changes. Peripheral geometry of a delta was strongly influenced by depositional gradients which formed the fan-shape delta on the steep slopes and developed the lobe-shape delta on the gentle slopes. Due to the discharge feed rivers can change rapidly driven by climatic variations, and the nearshore area of deltas display considerable facies variability. The rise of annual rainfall, which suggests the rivers feeding deltas are continuous, and result in distributary mouth bars that are prevalent in the front of deltas since the down-slope flows are greater than the along-slope currents. On the contrary, when the annual rainfall decreases and evaporation increases, the rivers only can feed deltas ephemerally. If the along-slope currents were in a dominant position, the distal bars were deposited. Progradation structure and sedimentary successions of deltas were controlled by the gradients of slopes. On gentle depositional slopes, shingle foreset beds predominate with fine sediments and small-scale sedimentary structures or vice versa.
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影响因子：
4.9
作者：
M. Lord;A. Kehew
通讯作者：
M. Lord;A. Kehew
DOI：
--
发表时间：
2000
期刊：
--
影响因子：
--
作者：
Cao Jian
通讯作者：
Cao Jian
影响因子：
3.5
作者：
J. Fisher;C. Krapf;S. Lang;G. Nichols;T. Payenberg
通讯作者：
J. Fisher;C. Krapf;S. Lang;G. Nichols;T. Payenberg
DOI：
--
发表时间：
1990
期刊：
--
影响因子：
--
作者：
C. Scholz;B. Rosendahl
通讯作者：
C. Scholz;B. Rosendahl
影响因子：
4.9
作者：
A. Carroll;S. Graham;M. Hendrix;D. Ying;Da Zhou
通讯作者：
A. Carroll;S. Graham;M. Hendrix;D. Ying;Da Zhou