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In order to clarify the genetic mechanism of shallow continental shelf sandbodies in the upper submember of the first member of Zhujiang Formation in the northwestern Zhusan Depression, with integrated use of geological and geophysical data, the five-order sequence framework was established firstly, inside of which, the shallow continental shelf sandbodies were identified and quantitatively described, and the temporal and spatial evolution of the shallow continental shelf sandbodies were analyzed, and the genetic mechanism was discussed. The results show that: (1) The upper submember of the first member of Zhujiang Formation in the study area can be divided into four five-order sequences, which were numbered as FS4, FS3, FS2 and FS1 from bottom to top. (2) There are two types of shelf sand bodies: tidal sand ridge and offshore sand bar, which are distributed in NW−SE direction. Tidal sand ridges are mainly distributed in the west of the study area, while offshore sand bars are concentrated in the east. (3) In the three five-order sequences FS4, FS3 and FS2, the scale and quantity of both tidal sand rdiges and offshore sand bars are relatively large, while in the upper five-order sequence FS1, the scale and quantity present poor. (4) Sedimentary base level (hydrodynamic condition), synsedimentary geomorphology and sediment debris supply jointly affected the development scale, distribution characteristics and temporal and spatial evolution of tidal sand ridges and offshore sand bars, which comprehensively constituted the genetic mechanism of shallow continental shelf sand bodies in the northwestern Zhusan Depression.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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