Sedimentation and tectonics of the lower and middle Eocene Swauk Formation in eastern Swauk Basin, central Cascades, central Washington
Sedimentation and tectonics of the lower and middle Eocene Swauk Formation in eastern Swauk Basin, central Cascades, central Washington
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华盛顿州中部喀斯喀特盆地东部斯沃克盆地中下始新世斯沃克组的沉积和构造
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发表时间：
1988
期刊：
影响因子：
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通讯作者：
James W. Roberts
中科院分区：
文献类型：
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作者：
Stephen B. Taylor;S. Y. Johnson;G. Fraser;James W. Roberts
斯沃克盆地位于华盛顿中部喀斯喀特的直溪和Entiat-Leavenworth断层系统之间，是太平洋西北部几个早第三纪走滑盆地之一。本文确定了盆地东部下部始新统下、中世斯瓦克组为7个非正式地层单元。这些单元地层厚度超过4800 m，沉积于冲积扇、辫状河、曲流河、湖三角洲和湖泊环境。古海流方向上的快速相变和反转表明有许多构造控制的排水重组。东、北、西3个方向沉积物主要来源于结晶岩，沉积速率高（约64 cm/1000年）。莱文沃斯断裂历史复杂，周期性地形成了斯沃克盆地的东缘。在最后阶段和沉积后不久…
The Swauk Basin lies between the Straight Creek and Entiat–Leavenworth fault systems in the central Cascades of Washington and is one of several early Tertiary strike-slip basins in the Pacific Northwest. In this paper, seven informal stratigraphic units are recognized in the lowest portion of the basin fill—the lower and middle Eocene Swauk Formation—in the eastern part of the basin. These units have a stratigraphic thickness of more than 4800 m and were deposited in alluvial fan, braided river, meandering river(?), lacustrine-deltaic, and lacustrine environments. Rapid facies changes and reversals in paleocurrent directions indicate numerous tectonically controlled drainage reorganizations. Sediments were mainly derived from crystalline rocks to the east, north, and west (?), and sediment accumulation rates were high (about 64 cm/1000 years). The Leavenworth fault has a complex history and, periodically, formed the eastern margin of Swauk Basin. During the final phases and shortly after deposition of th...