Frequency distribution of graded turbidite cycles in DSDP sediments from the Coral Sea Basin and the Sea of Japan

At sites 390 and 392 (Deep Sea Drilling Project, Leg 44) on the Blake nose, thoroughly lithified Lower Cretaceous limestone more than 250 m thick is abruptly overlain by a condensed sequence of Barremian to Eocene pelagic carbonate ooze. The Lower Cretaceous sediments consist of three units: limestone with moldic porosity (base), oolitic limestone, and fenestral limestone. Subaerial diagenesis of the limestone section is recorded by (1) caverns with vertical dimensions of up to 10 m, (2) stalactitic intergranular cement, and (3) meniscus sediment (or cement). Compatible with these subaerial features are mud cracks, fenestral fabrics, intraclasts, and cryptalgal structures. […]在布莱克鼻（Blake Nose）的390号与392号站位（深海钻探计划（Deep Sea Drilling Project）第44航次），一套厚度逾250米的完全固结下白垩统石灰岩（Lower Cretaceous limestone），被一套巴列姆期至始新世的远洋碳酸盐软泥凝缩层序以突变接触关系覆于其上。该下白垩统沉积物（Lower Cretaceous sediments）包含三个单元：具铸模孔隙的石灰岩（底部层位）、鲕状石灰岩（oolitic limestone）以及窗格石灰岩（fenestral limestone）。该石灰岩剖面的大气成岩作用（subaerial diagenesis）可通过以下特征得到印证：(1) 垂向规模可达10米的溶洞；(2) 钟乳状粒间胶结物；(3) 弯液面沉积物（或胶结物）。与这些大气成岩特征相吻合的还有泥裂、窗格构造（fenestral fabrics）、内碎屑（intraclasts）以及隐藻构造（cryptalgal structures）。[…]