Miocene dissolution facies and microfacies at Northwest Atlantic Deep Sea Drilling Project Site 93-603@en

Depth fluctuations of the lysocline and calcite compensation depth (CCD) through time were investigated at Deep Sea Drilling Project Site 603, Leg 93. The CCD fell during the middle Miocene at the onset of the Western Boundary Undercurrent, correlated with seismic Horizon X. Subsequently deposited units show fluctuations of the dissolution curve. Major changes in dissolution facies correspond with lithologic boundaries.

本研究以深海钻探计划（Deep Sea Drilling Project）第93航次603站位为研究对象，探究了溶跃面（lysocline）与方解石补偿深度（CCD）随时间演化的深度波动特征。中新世中期，伴随西边界底流（Western Boundary Undercurrent）的启动，方解石补偿深度出现下降，该现象与地震反射层X（Seismic Horizon X）具有相关性。后续沉积的地层单元呈现出溶解曲线的波动变化。溶解相的显著变化与岩性界面相对应。