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首页> 外文期刊>Oceanographic Literature Review >Genesis of Upper Permian Changxing Formation dolomites, south of Kaijiang-Liangping Trough, SW China: evidence from petrology, geochemistry, and fluid inclusions
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Genesis of Upper Permian Changxing Formation dolomites, south of Kaijiang-Liangping Trough, SW China: evidence from petrology, geochemistry, and fluid inclusions

机译：SW中国北京 - 梁平汤南南部上二叠纪长兴形成白云岩的成因：来自岩石学，地球化学和流体夹杂物的证据

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Dolomitization has a profound influence on the quality and distribution of the Changxing Formation reef-shoal gas fields in the south of Upper Permian Kaijiang-Liangping Trough. These gas fields consist of two types of matrix replacement dolomite (D1 and D2) and some saddle dolomite (SD). A comprehensive petro-graphic and geochemical examination indicates that Dl dolomite is formed by the replacement of matrix limestone by seepage-reflux of penesaline seawater during the syndiagenetic-early di-agenetic stage. This interpretation is supported by δ~(18)O values slightly higher than those of dolomites precipitated from coeval seawater and REE patterns similar to those of matrix limestones, reinforced by ~(87)Sr/~(86)Sr ratios that greatly overlap those of matrix limestones and coeval well-preserved fossils. Dolomitization by penesaline seawater rather than by hypersaline evaporated seawater is also supported by the absence of massive evaporites. D2 dolomite, with C-O-Sr isotopes and Fe-Mn concentrations comparable to those of Dl, formed through the hydrothermal alteration of Dl at temperatures between 163.2 and 189.3 °C during Early Triassic. SD precipitated directly from hydrothermal fluids at temperatures between 152.4 and 197.8 °C. The hydrothermal origins of D2 and SD are also supported by more negative δ~(18)O values than those of dolomite formed from coeval seawater, higher ~(87)Sr/~(86)Sr ratios, and positive Eu anomalies.
机译：多元化对上二叠纪开江 - 梁平槽南部长兴地层礁石气田的质量和分布产生了深远的影响。这些气体场由两种类型的基质替代白云石（D1和D2）和一些鞍白云岩（SD）组成。综合的石油 - 图形和地球化学检查表明DL Dolomite通过在SyndiaGenetic-早期的Di-engetic阶段渗透-Rexpage-reftux通过渗透回流进行基质石灰石而形成。该解释由Δ〜（18）o值略高于与与基质石灰岩类似的群岛海水和REE模式沉淀的多粒子的值，增强〜（87）SR /〜（86）SR比率大大重叠基质石灰岩和符合群体保存的化石。通过缺乏大规模蒸发器，还支持Penesaline海水而不是过氧化氢蒸发海水的二摩尔。 D2白云岩，具有与D1的C-O-SR同位素和Fe-Mn浓度相当，通过在早期三叠杆菌期间通过在163.2和189.3℃的温度下的温度下的水热改变而形成。 SD在152.4和197.8℃的温度下直接从水热流体沉淀。 D2和SD的水热源起源也比由氏族海水形成的多洛米特，更高〜（87）SR /〜（86）SR比和阳性欧盟异常的多洛米罐的Δ〜（18）o值支持。

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    《Oceanographic Literature Review》 |2021年第5期|1026-1026|共1页
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