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Systems tract successions under variable climatic and tectonic regimes: Aquantitative approach

机译：系统在变化的气候和构造条件下进行演替：一种定量方法

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摘要

Systems tracts are linkages of contemporaneous depositional systems that accumulate under specific conditions of accommodation and sediment supply. They are identified by their stratal stacking pattern and position within the sequence. In practice, it is often difficult to assign accurately relative sea-level position to stacking patterns. Observations also show that systems tracts may succeed each other in different orders, not necessarily according to the prediction of an ideal model. The purpose of this study is to analyze the quantitative conditions for different possible combinations of systems tractswithin a cycle of relative sea-level change. Icehouse and greenhouse eustatic trends, active and passive tectonics, and varying depositional rates are considered as conditions. The systems tracts were defined based on the rate of accommodation change and depositional rate.Our quantitative calculations revealed that if the tectonics is active and the basement motion-time curve is segmented with sharp turning points between segments, eight possible successions of systems tracts may occur. If the basement motion is transitional between segments of subsidence and uplift, six scenarios are possible. Only three possible combinations of systems tracts can form in a sea-level cycle if the basement tectonics is passive. Variable depositional rate alone can be responsible for four different combinations of systems tracts under similar accommodation conditions. These combinations of systems tracts may occur primarily in greenhouse world. Eustasy under icehouse climatic conditions has rapid rates of change (up to 4000 m/myr), which are likelymany times faster thanwhat subsidence/uplift rates realistically can reach.As a consequence, only the full series of systems tract in the order of forced regression-lowstand normal regression-transgression-highstand normal regression can be predicted in icehouse, although the thickness of systems tracts in the real rock record may be rather small because of the fast rate of sea-level change.
机译：系统域是当代沉积系统的联系，这些沉积系统在特定的居住条件和沉积物供应条件下积累。通过它们的地层堆积模式和在序列中的位置来识别它们。在实践中，通常很难将准确的相对海平面位置分配给堆叠模式。观察结果还表明，系统域可能会以不同的顺序彼此接替，而不必根据理想模型的预测。这项研究的目的是分析相对海平面变化周期中系统域的不同可能组合的定量条件。冰室和温室的喜人趋势，主动和被动构造以及变化的沉积速率被认为是条件。系统区域是根据适应变化率和沉积速率定义的。我们的定量计算表明，如果构造活动且基底运动时间曲线被分段且各段之间有尖锐的转折点，则可能会发生八种可能的系统序列。如果地下室运动在沉降和隆起之间是过渡的，则可能有六个方案。如果地下构造是被动的，则只能在海平面周期中形成三种系统组合。在相似的适应条件下，单独的可变沉积速率可以负责系统域的四种不同组合。系统区域的这些组合可能主要发生在温室世界中。冰屋气候条件下的Eustasy变化速度很快（最高4000 m / myr），可能比实际沉降/上升速率可以达到的速度快许多倍，因此，只有整个系统系列都以强制回归的顺序出现在冰室中，可以预测-低位正态回归-海侵-高位正态回归，尽管由于海平面变化速度快，真实岩石记录中的系统区域厚度可能很小。

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