当前位置: X-MOL 学术Proc. Geol. Assoc. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
‘Filament’ marker beds in the Karababa-A Member (Turonian) of the Arabian platform, SE Turkey: Palaeo-environmental significance, stratigraphy and correlation potential
Proceedings of the Geologists' Association ( IF 1.2 ) Pub Date : 2020-12-23 , DOI: 10.1016/j.pgeola.2020.11.004
O. Mülayim , I.O. Yilmaz , B. Sari , B. Ferré

A ‘filament’ event bed/level corresponds to the occurrence of thin elongate calcitic, shells, or plates of pelagic, bivalve or crinoidal, origin, within pelagic, laminated and organic-matter rich limestones. These organic-rich limestones had been generally deposited under hypoxic/anoxic conditions in an outer-ramp environment. These thin elongate, bivalve shells, or crinoidal plates, are found broken in small pieces, disintegrated, or simply preserved parallel to bedding as almost complete specimens. Such ‘filament’ beds were spotted in SE Turkey in deposits, namely the Karababa-A Member, around the Cenomanian-Turonian boundary (C/TB) and above. On a global scale, these filament event beds illustrate sea-level rise related to eustacy and/or climatic change. The abundance of filaments close to the C/TB is a biological marker of high organic productivity resulting from a climatic change to warmer conditions. The prevailing higher sea-level conditions were then favourable to the accumulation and preservation of organic-rich facies, characteristic of the Oceanic Anoxic Event 2 (OAE2). Using both biostratigraphic and carbon isotopic data, those deposits were dated from the latest Cenomanian-Turonian age. ‘Filament’ event beds were recorded in the same order, except for some small differences. A good number of these bio-events are global. Consequently, on a global scale, they are susceptible to constrain the C/TB, especially the base of the Turonian stage, with a significant degree of confidence.



中文翻译:

土耳其东南部阿拉伯平台的Karababa-A成员(土耳其语)中的“细丝”标记床:古环境意义,地层学和相关潜力

“细丝”事件床/水位对应于中上层,层状和有机质富集的石灰岩中薄层细长的钙质,壳层或中上层,双壳层或海床形板块的发生。这些富含有机物的石灰石通常是在外部斜坡环境中的低氧/缺氧条件下沉积的。这些薄而细长的双壳贝壳或海百合板被发现破碎成小块,崩解或与床褥平行地保存为几乎完整的标本。在土耳其东南部的塞诺曼尼亚-土伦边界(C / TB)及以上,在沉积物中发现了这种“长丝”床,即卡拉巴巴-A成员。在全球范围内,这些花丝活动床说明了与节水和/或气候变化有关的海平面上升。气候变化导致气候变暖,接近C / TB的长丝数量是高有机生产力的生物学标志。当时盛行的较高海平面条件有利于富有机相的积累和保存,这是海洋缺氧事件2(OAE2)的特征。使用生物地层学数据和碳同位素数据,这些沉积物的年代是最近的塞诺曼尼亚-土伦时代。“细丝”活动床以相同的顺序记录,除了一些小的差异。这些生物事件中有很多是全球性的。因此,在全球范围内,他们很容易以很大的信心来约束C / TB,尤其是图龙期的基础。当时盛行的较高海平面条件有利于富有机相的积累和保存,这是海洋缺氧事件2(OAE2)的特征。使用生物地层学数据和碳同位素数据,这些沉积物的年代是最近的塞诺曼尼亚-土伦时代。“细丝”活动床以相同的顺序记录,除了一些小的差异。这些生物事件中有很多是全球性的。因此,在全球范围内,他们很容易以很大的信心来约束C / TB,尤其是图龙期的基础。当时盛行的较高海平面条件有利于富有机相的积累和保存,这是海洋缺氧事件2(OAE2)的特征。使用生物地层学数据和碳同位素数据,这些沉积物的年代是最近的塞诺曼尼亚-土伦时代。“细丝”活动床以相同的顺序记录,除了一些小的差异。这些生物事件中有很多是全球性的。因此,在全球范围内,他们很容易以很大的信心来约束C / TB,尤其是图龙期的基础。“细丝”活动床以相同的顺序记录,除了一些小的差异。这些生物事件中有很多是全球性的。因此,在全球范围内,他们很容易以很大的信心来约束C / TB,尤其是图龙期的基础。“细丝”活动床以相同的顺序记录,除了一些小的差异。这些生物事件中有很多是全球性的。因此,在全球范围内,他们很容易以很大的信心来约束C / TB,尤其是图龙期的基础。

更新日期:2020-12-23
down
wechat
bug