Oxygen and Carbon Isotopic Compositions of Middle Triassic Carbonates from the Dawazi Section of <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:place w:st="on"><st1:City w:st="on">Luoping</st1:City>, <st1:State w:st="on">Yunnan</st1:State></st1:place> Province: Implications for Paleoenvironment of the Luoping Lagerstatte <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

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PAN style="COLOR: black; FONT-SIZE: 14pt; mso-font-kerning: 18.0pt; mso-bidi-font-weight: bold" lang=EN-US>Oxygen and Carbon Isotopic Compositions of Middle Triassic Carbonates from the Dawazi Section of Luoping, Yunnan Province: Implications for Paleoenvironment of the Luoping Lagerstatte

详细信息

责任者：Sun Yuanyuan (Chengdu Center ; China Geological Survey ; Chengdu 610081 ; China) ; Liu Jun
刊名：Acta Geologica Sinica
出版年：2009
卷期：83(8)
关键词：稳定同位素 ; stable isotopes ; 关岭组 ; Guanling Formation ; 云南 ; Yunnan Province
页码：p.1110-1117
图表：4 illus., 1 table, 46 refs.
分类号：1200
issnNo：ISSN0001-5717
isbnNo：CN11-1951/P

摘要

PAN style="FONT-SIZE: 14pt" lang=EN-US>

To understand the paleoenvironment of Pelsonian Dawazi section of the Luoping Lagerstatte analyzed carbon and oxygen isotopes using the whole rock carbonates from this section. The result shows that δ¹³C and δ¹⁸O of the mid-Trassic Dawazi distribute between -4. 5‰～1. 1‰ and between -5.2‰～-1.0‰ respectively. The average value of δ¹³C is -3.03‰ while δ¹⁸O is -3.36‰. The relevant analysis of δ¹³C and δ¹⁸O reveals little effect from meteoric water involved diagenesis. Combined with the sedimentological and paleontological evidences, it is suggested that the negative shift of δ¹³C in the obvious negative horizons may be caused by the reduction of the sulfur bacteria. The H₂S released by the activity of the sulfur bacteria can partially explain the large-scale demise of Luoping Lagerstatte. The result shows that the average temperature of seawater in the Pelsonian of Luoping was about 29 ℃, indicating a warm paleoenvironment during that period.

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