Paleo-environment of the Late Triassic-Early Jurassic in the land area next to the southern East China Sea Shelf

SUN Jing; YANG Changqing; XU Liming; WANG Jianqiang

doi:10.16562/j.cnki.0256-1492.2019072501

Marine Geology & Quaternary Geology > 2019 > 39(6): 81-92. > DOI: 10.16562/j.cnki.0256-1492.2019072501

SUN Jing, YANG Changqing, XU Liming, WANG Jianqiang. Paleo-environment of the Late Triassic-Early Jurassic in the land area next to the southern East China Sea Shelf[J]. Marine Geology & Quaternary Geology, 2019, 39(6): 81-92. DOI: 10.16562/j.cnki.0256-1492.2019072501

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Paleo-environment of the Late Triassic-Early Jurassic in the land area next to the southern East China Sea Shelf

1.
Qingdao Institute of Marine Geology, Ministry of Natural Resources, Qingdao 266071, China
2.
Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
3.
Fujian Institute of Geological Survey, Fuzhou 350013, China

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Received Date: July 24, 2019
Revised Date: October 08, 2019
Available Online: December 23, 2019

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Abstract

Abstract

The research area, the land next to the southern East China Sea Shelf Basin, includes both the southeastern part of Fujian Province and the northeastern part of Guangdong Province. Based on field geological survey, microscopic observation and geochemical testing, the paleo-environment of the Late Triassic-Early Jurassic deposits of the area is carefully investigated. It is revealed that the sediments are deposited in a deep water anaerobic environment during late Triassic-Early Jurassic, when the region was dominated by warm and humid climate in the southeastern part of Guangdong Province. During Late Triassic, the southern part of the land area gradually became shallower northwards. Consequently, the southern part of the study area was dominated by a assemblage of coast, shallow shelf and deep shelf, while the northern part dominated by a marine-land transitional environment under the affect of transgression. In early Jurassic, the southern part of the region became an outer shelf with great water depth, and the northern part become marine-continental transitional and sometimes continental environment alone. Based on the paleo-environment research of the adjacent land area with the same geotectonic background, it is concluded that the Mesozoic paleo-environment varied southwards from continent to marine in the southern part of the East China Sea Shelf Basin. The paleo-geographic pattern is helpful to study the Mesozoic petroleum geology in the region.
- depositional paleo-environment,
- Late Triassic-Early Jurassic,
- southern East China Sea Shelf,
- adjacent continental area

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References

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Paleo-environment of the Late Triassic-Early Jurassic in the land area next to the southern East China Sea Shelf