Citation: | CHEN Xiaohui, MENG Xiangjun, LI Rihui. Sequence stratigraphy of the Late Quaternary in Liaodong Bay[J]. Marine Geology & Quaternary Geology, 2020, 40(2): 37-47. doi: 10.16562/j.cnki.0256-1492.2019042301 |
High-resolution seismic reflection data are studied in details together with core data in order to determine the stratigraphic sequence of Liaodong Bay since the MIS5 of Late Quaternary. The high-resolution seismic profiles selected from the study area may be subdivided into six seismic units, i.e. SU5, SU4, SU3, SU2, SU12, SU11 in descending order, which could be clearly correlated with the six depositional units, DU5, DU4, DU3, DU2, DU12, DU11 respectively based on lithology, microfossil assemblages and geochronology of the cores. These units may be grouped into three distinctive sequences, SQ3, SQ2, SQ1 in descending order by two sequence boundaries of R5 and R3 with obvious hiatus, which correspond to the low sea-levels of MIS4 and MIS2, respectively. The SQ3 is the remained upper part of transgressive systems tract (TST) and highstand systems tract (HST), corresponding to DU5, the littoral and neritic facies of MIS5. SQ2 is composed of lowstand systems tract (LST), fluvial deposits and incised-channel filling facies (DU4) formed in MIS4 plus the TST littoral facies (DU 3) deposited during Early-Middle MIS3. And the SQ1 is comprised of the LST, DU2 fluvial deposits to incised-channel filling facies formed in MIS2, TST, DU12 deposits of littoral facies formed during Early-Middle Holocene, and the HST, DU11 deposits of neritic facies since the highstand sea-level of Holocene. The TSTs is relatively continuous and widely distributed, while LSTs vary considerably in thickness and lateral distribution since MIS5 in Liaodong Bay.
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Locations of shallow seismic profiles and cores in the Liaodong Bay
NW-SE seismic profile of Line Z17 in Liaodong Bay (see Fig. 1 for location)
SE-NW seismic profile of Line Z25 in Liaodong Bay (see Fig. 1 for location)
NE-SW seismic profile of Line L8 through core LD01 in Liaodong Bay (see location in Fig. 1)
Thickness of unit SU4(A)and depth of unit SU5 top boundary(B)in Liaodong Bay
Isopach maps of units SU2(A)and SU3(B)in Liaodong Bay
Isopach maps of units SU11(A)and SU12(B)in Liaodong Bay
Correlation between the depositional units of the core YKC-2 and the seismic units from the profile through the core in Liaodong Bay (see Fig. 1 for location)
Sequence stratigraphy in Liaodong Bay and its correlation with sea-level fluctuation (Chappell et al[21],Lea et al[22]) during Late Quaternary
Stratigraphic correlation of core YKC-2 with cores Bc-1[1] and LDD7[10] (see Fig. 1 for location)