Emplacement of oil in the Devonian Weardale Granite of northern England
Emplacement of oil in the Devonian Weardale Granite of northern England
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DOI：
10.1144/pygs2018-008
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发表时间：
2018-12
期刊：
影响因子：
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通讯作者：
Mas'ud Baba;J. Parnell;S. Bowden;J. Armstrong;Magali Perez;X. Wang
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文献类型：
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作者：
Mas'ud Baba;J. Parnell;S. Bowden;J. Armstrong;Magali Perez;X. Wang
石油残留物以固体沥青的形式出现在英格兰北方奔宁山脉北方泥盆纪Weardale花岗岩的矿化带中。类似的残留物存在于上覆的密西西比期岩石中，可能来自石炭纪，即在花岗岩的后期矿化过程中。沥青在萤石成矿过程中已经固化，不含油包裹体。残留物没有显示高的热成熟度的有机质在该地区改变了最早的二叠纪Whin Sill。与硫化物-萤石矿化一样，石油侵位晚于岩床侵入。与石油残留物相关的黄铁矿富含微量元素，包括铅、银、金、硒和碲，这表明成矿流体至少与迁移的烃类共享路径，并且还可能暗示未发现的有价值的金属资源。
Oil residues occur as solid bitumen in mineralized zones within the Devonian Weardale Granite of the northern Pennines, northern England. Comparable residues are present in the overlying Mississippian rocks and were probably derived from a Carboniferous source, i.e. during later mineralization of the granite. The bitumen was already solidified during fluorite mineralization, which does not contain oil inclusions. The residues do not show the high thermal maturity of organic matter in the region altered by the earliest Permian Whin Sill. Like the sulphide-fluorite mineralization, oil emplacement post-dated intrusion of the sill. Pyrite associated with the oil residues is enriched in trace elements including lead, silver, gold, selenium and tellurium, which suggests that mineralizing fluids at least shared pathways with migrating hydrocarbons and possibly also suggests undiscovered valuable metal resources.