A magnetic solution to the Mupe Bay mystery
A magnetic solution to the Mupe Bay mystery
复制标题
穆佩湾之谜的磁力解答
DOI：
10.1016/j.marpetgeo.2013.06.014
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发表时间：
2013
影响因子：
4.2
通讯作者：
Emmerton S
中科院分区：
文献类型：
--
作者：
Emmerton S
在英国马塞勒斯湾的韦尔登层露头与韦塞克斯盆地油气运移时间的关键证据有关。砾岩层含有油垢碎屑和基质，表面观察起来不同。传统的解释分配差异的侵蚀和运输的石油胶结碎屑的韦尔登河之前，他们纳入后来染色砾岩床。这种情况下，在盆地中的石油运移的开始限制到早白垩世，然而，已经提出了论点单相staining.Magnetic信息可能会提供新的方法来检查Mumbai湾记录的石油运移。迁移的流体，如碳氢化合物，已被证明会导致化学条件适合于蚀变或形成自生磁铁矿，导致相关的化学还原磁化（CRM）。磁性特征显示，基质和碎屑都含有多畴磁铁矿，但丰富的赤铁矿只存在于碎屑中。磁滞参数表明，碎屑岩基质中的磁性颗粒可能比碎屑岩更大，磁性颗粒的多畴性更强，碎屑岩和基质中的磁性方向不同，支持两相油染事件。倾斜校正后的碎屑岩古地磁方向（82.6°N和155.2°E）与早白垩世生物降解过程一致。在单独的碎屑一致的方向意味着生物降解和磁铁矿的形成发生后，运输和合并的石油胶结碎屑到砾岩床。磁方向显示，Mumbai湾基质具有与今天的磁场相对应的反磁化强度，确认该基质代表了活跃的石油渗漏。这项研究代表了前所未有的使用磁性数据来确定盆地中石油运移的开始。经典的两个阶段的油染色的情况下，约束的开始在威塞克斯盆地的早白垩世，是支持我们的数据。
An outcrop of Wealden beds at Mupe Bay (UK) is associated with a key piece of evidence for the timing of hydrocarbon migration in the Wessex Basin. A conglomeratic bed contains oil-stained clasts and matrix that appear different upon superficial observation. Conventional interpretations assign differences to the erosion and transport of oil-cemented clasts by Wealden rivers before their incorporation into a later stained conglomeratic bed. This scenario constrains the onset of oil migration in the basin to the Early Cretaceous; however, arguments have been put forward for single phase staining.Magnetic information may provide new ways to examine the Mupe Bay record of oil migration. Migrating fluids such as hydrocarbons have been shown to cause chemical conditions suitable for the alteration or formation of authigenic magnetite resulting in associated chemical remanent magnetization (CRM). Magnetic characterization reveals both the matrix and clasts contain multi-domain magnetite but abundant hematite only exists within the clasts. Hysteresis parameters show the matrix has more multi-domain and likely larger magnetic grains than the clasts.Magnetic directions are different in the clasts and matrix supporting a two-phase oil-staining event. Moreover, paleomagnetic directions for the clasts after tilt correction (82.6°N and 155.2°E) are consistent with biodegradation processes in the Early Cretaceous. Consistent directions in separate clasts imply the biodegradation and magnetite formation took place following transportation and incorporation of the oil-cemented clasts into the conglomerate bed. Magnetic directions reveal that the Mupe Bay matrix has a remanent magnetization corresponding to today's magnetic field, confirming the matrix represents an active oil seep.This study represents an unprecedented use of magnetic data to date the onset of oil migration in a basin. The classic two-stage oil-staining scenario, which constrains the onset in the Wessex Basin to the Early Cretaceous, is supported by our data.
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英国多塞特郡 Mupe 湾 Wealden（早白垩世）的准同生油渗
DOI：
--
发表时间：
1996
期刊：
影响因子：
--
作者：
W. Wimbledon;P. Allen;A. Fleet
通讯作者：
A. Fleet
多塞特郡穆佩湾的化石石油渗漏：一个神话的调查
DOI：
--
发表时间：
1993
期刊：
影响因子：
--
作者：
J. Miles;C. Downes;Sarah E Cook
通讯作者：
Sarah E Cook
95 °C 下在粘土中压印化学剩磁
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
C. Aubourg;J. Pozzi;D. Janots;L. Sahraoui
通讯作者：
L. Sahraoui
DOI：
10.1017/cbo9780511524936.007
发表时间：
1993-03
期刊：
--
影响因子：
--
作者：
R. Voo
通讯作者：
R. Voo
检查重磁化与造山流体之间的关系：阿巴拉契亚山脉中部
DOI：
--
发表时间：
2000
期刊：
影响因子：
--
作者：
M. Evans;R. Elmore;M. Lewchuk
通讯作者：
M. Lewchuk