The marine redox change and nitrogen cycle in the Early Cryogenian interglacial time: Evidence from nitrogen isotopes and Mo contents of the basal Datangpo Formation, northeastern Guizhou, South China
The marine redox change and nitrogen cycle in the Early Cryogenian interglacial time: Evidence from nitrogen isotopes and Mo contents of the basal Datangpo Formation, northeastern Guizhou, South China
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早寒世间冰期海洋氧化还原变化与氮循环：来自贵州东北部大塘坡组基底氮同位素和钼含量的证据
DOI：
10.1007/s12583-015-0657-1
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发表时间：
2016-04
影响因子：
3.3
通讯作者：
Yang Bin
中科院分区：
文献类型：
--
作者：
Wei Wei;Wang Dan;Li Da;Ling Hongfei;Chen Xi;Wei Guangyi;Zhang Feifei;Zhu Xiangkun;Yang Bin
成冰期大塘坡组沉积于斯图尔特冰期和马里诺冰期之间的间冰期。我们对贵州东北部大塘坡组基底黑色页岩的氮同位素组成和Mo含量进行了研究，试图重建间冰期海洋氧化还原变化和氮循环。根据岩石地层学和地球化学剖面，将基底黑色页岩划分为4个层段：1层段δ15N值最低（+5.0‰）；1层段δ15N值最低（+5.0‰）；1层段δ15N值最低。在区间2中，δ15N值在+6.4‰和+7.4‰之间变化（第一个峰值）；区间3记录δ15N稳定值在+6‰左右；区间 4 的特点是其较高的 δ15N 值，介于 +6.7‰ 和 +7.8‰ 之间（第二个峰值）。随着地层的上升趋势，Mo富集系数值从56.8下降到2.6。这表明，斯图尔特冰期之后，扬子地台南缘陆架与斜坡过渡带以上的海洋海水发生分层，浅层海水呈含氧状态，深水呈含硫状态。随后，尽管表层海水出现短暂的好氧状态，但低氧区域的反硝化率仍较高，而深层海水仍处于缺氧甚至弱氧状态。
Cryogenian Datangpo Formation was deposited during the interglacial time between the Sturtian and Marinoan ice ages. We studied nitrogen isotope compositions and contents of Mo of the black shales from the basal Datangpo Formation in northeastern Guizhou, South China, for an attempt to reconstruct the marine redox change and nitrogen cycle during the interglacial time. Based on lithostratigraphy as well as geochemical profiles, the basal black shales can be divided into four intervals: Interval 1 has the lowest δ15N value (+5.0‰); in interval 2, δ15N values vary between +6.4‰ and +7.4‰ (the first peak); interval 3 records stable values of δ15N around +6‰; and interval 4 is characterized by its higher δ15N values, between +6.7‰ and +7.8‰ (the second peak). The values of enrichment factor of Mo decrease from 56.8 to 2.6 with the ascending stratigraphic trend. It indicated that immediately after the Sturtian glaciations, the marine seawater above the transitional zone between the shelf to slope of the southern margin of the Yangtze Platform was stratified, with shallow seawater being oxic but deep water being sulfidic. Subsequently, high denitrification rates prevailed in expanded suboxic areas in spite of a short emergence of an oxic condition in the surface seawater, and the deep seawaters were still anoxic or even euxinic.
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影响因子：
2.4
作者：
Zhang, Shihong;Han, Yigui;Jiang, Ganqing
通讯作者：
Jiang, Ganqing
影响因子：
5.8
作者：
R. Larson
通讯作者：
R. Larson
影响因子：
5.1
作者：
N. Ohkouchi;Y. Nakajima;H. Okada;N. Ogawa;Hisami Suga;K. Oguri;H. Kitazato
通讯作者：
N. Ohkouchi;Y. Nakajima;H. Okada;N. Ogawa;Hisami Suga;K. Oguri;H. Kitazato
影响因子：
5.3
作者：
M. Prokopenko;D. Hammond;W. Berelson;J. Bernhard;L. Stott;R. Douglas
通讯作者：
M. Prokopenko;D. Hammond;W. Berelson;J. Bernhard;L. Stott;R. Douglas
影响因子：
4.9
作者：
Altabet, M. A.
通讯作者：
Altabet, M. A.