Changes in fluid pathways in a calcite vein mesh (Natih Formation, Oman Mountains) : insights from stable isotopes
Changes in fluid pathways in a calcite vein mesh (Natih Formation, Oman Mountains) : insights from stable isotopes
复制标题
方解石脉网（阿曼山脉纳提赫地层）中流体路径的变化：来自稳定同位素的见解
DOI：
10.1111/gfl.12083
复制
发表时间：
2014
期刊：
影响因子：
1.7
通讯作者：
Janos Urai
中科院分区：
文献类型：
--
作者：
Max Arndt;Simon Virgo;S. F. Cox;Janos Urai
We present a structural, microstructural, and stable isotope study of a calcite vein mesh within the Cretaceous Natih Formation in the Oman Mountains to explore changes in fluid pathways during vein formation. Stage 1 veins form a mesh of steeply dipping crack‐seal extension veins confined to a 3.5‐m‐thick stratigraphic interval. Different strike orientations of Stage 1 veins show mutually crosscutting relationships. Stage 2 veins occur in the dilatant parts of a younger normal fault interpreted to penetrate the stratigraphy below. The δ18O composition of the host rock ranges from 21.8‰ to 23.7‰. The δ13C composition ranges from 1.5‰ to 2.3‰. This range is consistent with regionally developed diagenetic alteration at top of the Natih Formation. The δ18O composition of vein calcite varies from 22.5‰ to 26.2‰, whereas δ13C composition ranges from −0.8‰ to 2.1‰. A first trend observed in Stage 1 veins involves a decrease of δ13C to compositions nearly 1.3‰ lower than the host rock, whereas δ18O remains constant. A second trend observed in Stage 2 calcite has δ18O values up to 3.3‰ higher than the host rock, whereas the δ13C composition is similar. Stable isotope data and microstructures indicate an episodic flow regime for both stages. During Stage 1, formation of a stratabound vein mesh involved bedding‐parallel flow, under near‐lithostatic fluid pressures. The18O fluid composition was host rock‐buffered, whereas13C composition was relatively depleted. This may reflect reaction of low13C CO2derived by fluid interaction with organic matter in the limestones. Stage 2 vein formation is associated with fault‐controlled fluid flow accessing fluids in equilibrium with limestones about 50 m beneath. We highlight how evolution of effective stress states and the growth of faults influence the hydraulic connectivity in fracture networks and we demonstrate the value of stable isotopes in tracking changes in fluid pathways.
登录
查看更多内容
影响因子：
--
作者：
Jean-Paul Breton;F. Béchennec;J. Le Métour;L. Moen-maurel;P. Razin
通讯作者：
Jean-Paul Breton;F. Béchennec;J. Le Métour;L. Moen-maurel;P. Razin
使用结构、稳定同位素和流体包裹体相结合的研究来限制瓦里斯坎前缘北部区域（法国北部贝特雷希）的运动学历史
DOI：
--
发表时间：
2000
期刊：
影响因子：
--
作者：
I. Kenis;P. Muchez;M. Sintubin;J. Mansy;F. Lacquement
通讯作者：
F. Lacquement
爱达荷-怀俄明-犹他褶皱冲断带阿布萨罗卡逆冲断层下盘同构造脉形成条件
影响因子：
3.1
作者：
D. Wiltschko;G. Lambert;W. Lamb
通讯作者：
W. Lamb
影响因子：
3.4
作者：
I. Cartwright;W. Power;N. Oliver;R. Valenta;G. S. Mclatchie
通讯作者：
I. Cartwright;W. Power;N. Oliver;R. Valenta;G. S. Mclatchie
二氧化碳在煤矿突出中的作用的同位素研究。
DOI：
--
发表时间：
1980
期刊：
影响因子：
--
作者：
J. Smith;K. Gould
通讯作者：
K. Gould