Abstract During the Exxon Time for sequence stratigraphy,as the first important conceptual progress,it was proposed that the continental sequence is usually formed in a rising period within a base-level changing cycle under the conceptual system of the subaerial unconformity that makes up the sequence boundary. The continental sequence is characterized by amalgamated and isolated fluvial channel sandstones, with grain size fining upward. However,there are many conceptual inconsistencies for the continental sequence stratigraphy especially for the division of system tracts,such as the transgressive system tract or the high-stand system tract,which were resulted from the interpretation of marine “conventional”system tracts. The “unconventional”system tracts for the continental sequence are established under this situation,i.e. the high accommodation and the low accommodation system tracts,which might represent the second conceptual advancement of the continental sequence stratigraphy. More importantly,although the major sedimentation occurred during the ascending period of base-level like marine strata,deposits may be formed within the descending period of base-level,which further reflects the complicated sediment accumulation and its response mechanism of a continental sequence,as well as its variability. The characteristics mentioned above have become one of the focal points in recent years.It is very meaningful for tracing both the changes and progresses of the conceptual systems for the continental sequence stratigraphy,and is very favorable for further understanding of the sophisticated forming process of the continental sequences,which represents a significant advancement on the study of sequence stratigraphy.
Fund:[Financially supported by the National Natural Science Foundation of China(No.41030318)]
About author: Yao Yao,born in 1986,is a Ph.D. candidate at China University of Geosciences(Beijing). She is mainly engaged in researches on sedimentology and stratigraphy. E-mail:yaoyao_cug@163.com.
Cite this article:
Yao Yao,Mei Chaojia. The composition of “unconventional”system tracts within the continental sequence: An important advancement on sequence stratigraphy[J]. JOPC, 2017, 19(3): 513-524.
Yao Yao,Mei Chaojia. The composition of “unconventional”system tracts within the continental sequence: An important advancement on sequence stratigraphy[J]. JOPC, 2017, 19(3): 513-524.
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