Seawater Incursion Events in a Cretaceous Paleo-lake Revealed by Specific Marine Biological Markers
作者： J. F. Hu , P. A. Peng , M. Y. Liu , D. P. Xi , J. Z. Song
DOI: 10.1038/SREP09508
关键词: Nutrient 、 Seawater 、 Tectonics 、 Total organic carbon 、 Paleontology 、 High productivity 、 Sea level 、 Cretaceous 、 Structural basin 、 Geology
摘要: Many large paleo-lakes in North China were formed after the Triassic Era. Seawater incursion events (SWIEs) these lakes have been extensively discussed literature, yet lack reliable methodology and solid evidence, which are essential for reconstructing confirming SWIEs. The present study employs specific marine biological markers (24-n-propyl 24-isopropyl cholestanes) to trace SWIEs a dated core taken from Songliao Basin (SLB). Two identified. first SWIE 91.37 89.00 Ma, was continuous variable but not strong, while second 84.72 83.72 Ma episodic strong. caused high total organic carbon (TOC) negative δ13Corg values sediments, interpreted as an indication of productivity lake, due enhancement nutrient supplies well levels aqueous CO2, mixing alkaline seawater acidic lake water. SLB controlled by regional tectonic activity eustatic variation. Movement direction changes Izanagi/Kula Plate 90 84 created faults triggered A sea level, also facilitated occurrence SLB.
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