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广西南丹-河池盆地在晚泥盆世基本继承了早、中泥盆世的古地理环境,仍为受基底断裂控制的台间河槽或称为狭长状裂谷型盆地。该盆地沉积了一套由硅岩(D_3~1)、宽条带灰岩(D_3~(2a))、细条带灰岩(D_3~(2b))、小扁豆灰岩(D_3~(2c))及大扁豆灰岩(D_3~(2d))组成的沉积物。 我们认为丹池盆地在晚泥盆世仍处于深水—半深水的安静水体环境。主要根据如下: 1.在罗富剖面的中原层状泥灰岩层(D_3~(2a))中有几十层碳酸岩浊流沉积。浊积岩的碎屑颗粒较细,主要为粉砂级。鲍玛序列主要出现
The Nandan-Hechi Basin in Guangxi basically inherited the Paleo-Middle Paleo-Palaeogeography in the Late Devonian and remained an inter-platform channel controlled by basement faults or a narrow-length rift basin. This basin has a sedimentary facies assemblage of siltstone (D_3 ~ 1), broad-band limestone (D_3 ~ (2a)), fine-banded limestone (D_3 ~ (2b)) and lentil limestone (D_3 ~ (2c) ) And large lentils limestone (D_3 ~ (2d)) sediments. We think that the Danchi Basin was still in deep water - semi-deep water in a quiet water environment during the Late Devonian. Mainly based on the following: 1. There are dozens of layers of carbonate rock turbidite deposited in the Loess Plateau Central Plains bedded marl (D_3 ~ (2a)). Turbidite debris smaller particles, mainly silt level. Bowman sequence appears mainly