摘要:
文中主要论点是:1)区内中三叠统属巨厚复理石相,它清楚地显示出以浊流为主的深水块体流沉积的各种标志性特征;2 )巨厚沉积序列的粒度和层厚自下而上呈规律性变粗变厚,构成完整的进积型沉积序列;3)除块体流沉积外,还发现深水牵引流沉积与浊积岩相伴而生,如等深积岩和内波、内潮汐沉积,由其形成的沉积构造丰富多样,如不同类型,不同规模的交错层理极为常见,它们在层面上相应形成不同特征的水流波痕;4)从有否粗粒水道沉积、垂直序列有否规律性变化、古水流特征和丰富的相类型 4个方面分析认为,属于不成熟被动边缘的海底扇。
Abstract:
The main point of views in the paper are 1) the Middle Triassic in the studied area is very thick flysch facies with various characteristics of deep water mass flow sediments dominated by turbidites, 2) the size and thickness of the very thick flysch facies become coarse and thick upward, constituting a whole progressive sequence, 3) besides mass flow sediments, deep water drag flow sediments associated with turbidites were also found, e.g., contourites, and inner wave and inner tide sediments with diversified sedimentary structures, e.g., different types and scales of cross bedings showing water flow waves ripples on sedimentary bed surfaces with different characteristics, 4)if there are coarse sized channel sediments and regularities of vertical sequences and characteristics of ancient flows and rich facies types, the flysch facies are considered to be controlled by deep-sea fan sedimentary facies, 5) compared with the submarine fans developed on the passive and active margins of the plates the submarine fan is considered as an immature one.
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