论文部分内容阅读
Magaritz等通过对南阿尔卑斯二叠系-三叠系界线(P/T)剖面δ~(13)C值变化研究认为,δ~(13)C值在P/T剖面上的变化是判断存在沉积间断的重要标准。他认为因煤山和上寺等P/T界线剖面的δ~(13)C值在界线附近的变化有明显的突然性,从P/T界线上下δ~(13)C值下降到恢复之间的间距太小(<2m),而认为这两个P/T界线剖面在界线附近存在沉积间断。我们通过研究西藏色龙P/T界线剖面的生物地层学和δ~(13)C值,以及对比现代海洋溶解无机碳的δ~(13)C的变化后认为,用扩δ~(13)C值在剖面中的分布特征是否渐变,以及其在剖面中下降-恢复的距离大小,来判别剖面的沉积记录完整性的观点,尚需进一步推敲。
Magaritz et al. Studied the δ ~ (13) C variation of the Permian-Triassic Boundary (P / T) section of the Southern Alps. The change of δ ~ (13) C value in the P / T section is a measure of the presence of sediments Intermittent important criteria. He thinks that the change of δ ~ (13) C value in the P / T boundary section such as Meishan and Shangsi has obvious abrupt change from the δ ~ (13) C value above the P / T boundary to the recovery The spacing between the two P / T boundary sections is too small (<2m), and there is a deposition discontinuity between the two P / T boundary sections. By studying the biostratigraphy and δ ~ (13) C values of P / T boundary line in Tibet and comparing δ ~ (13) C in modern marine dissolved inorganic carbon, C value in the distribution of the profile is gradually changing, and its decline in the profile - the recovery of the size of the section to determine the integrity of sedimentary records point of view, still need further study.